Lithium-ion battery

A lithium-ion battery or Li-ion battery (abbreviated as LIB) is a type of rechargeable battery. Lithium-ion batteries are commonly used for portable electronics and electric vehicles and are growing in popularity for military and aerospace applications.[9] A prototype Li-ion battery was developed by Akira Yoshino in 1985, based on earlier research by John Goodenough, M. Stanley Whittingham, Rachid Yazami and Koichi Mizushima during the 1970s–1980s,[10][11][12] and then a commercial Li-ion battery was developed by a Sony and Asahi Kasei team led by Yoshio Nishi in 1991.[13] In 2019, The Nobel Prize in Chemistry was given to Yoshino, Goodenough, and Whittingham "for the development of lithium ion batteries"

This article is about rechargeable lithium-ion batteries. For disposable primary lithium batteries, see Lithium battery.

"Lithium-ion" redirects here. For the metal element, see Lithium.

Lithium-ion battery

A Li-ion battery from a Nokia 3310 mobile phone.
Specific energy	100–265 W·h/kg[1][2] (0.36–0.875 MJ/kg)
Energy density	250–693 W·h/L[3][4] (0.90–2.43 MJ/L)
Specific power	~250 – ~340 W/kg[1]
Charge/discharge efficiency	80–90%[5]
Energy/consumer-price	6.4 Wh/US$[6]
Self-discharge rate	0.35% to 2.5% per month depending on state of charge[7]
Cycle durability	400–1,200 cycles [8]
Nominal cell voltage	3.6 / 3.7 / 3.8 / 3.85 V, LiFePO4 3.2 V

In the batteries, lithium ions move from the negative electrode through an electrolyte to the positive electrode during discharge, and back when charging. Li-ion batteries use an intercalated lithium compound as the material at the positive electrode and typically graphite at the negative electrode. The batteries have a high energy density, no memory effect (other than LFP cells)[14] and low self-discharge. They can however be a safety hazard since they contain flammable electrolytes, and if damaged or incorrectly charged can lead to explosions and fires. Samsung was forced to recall Galaxy Note 7 handsets following lithium-ion fires,[15] and there have been several incidents involving batteries on Boeing 787s.

Chemistry, performance, cost and safety characteristics vary across LIB types. Handheld electronics mostly use lithium polymer batteries (with a polymer gel as electrolyte) with lithium cobalt oxide (LiCoO
₂) as cathode material, which offers high energy density, but presents safety risks,[16][17]^{:20:21–21:35} especially when damaged. Lithium iron phosphate (LiFePO
₄), lithium ion manganese oxide battery (LiMn
₂O
₄, Li
₂MnO
₃, or LMO), and lithium nickel manganese cobalt oxide (LiNiMnCoO
₂ or NMC) offer lower energy density but longer lives and less likelihood of fire or explosion. Such batteries are widely used for electric tools, medical equipment, and other roles. NMC and its derivatives are widely used in electric vehicles.

Research areas for lithium-ion batteries include extending lifetime, increasing energy density, improving safety, reducing cost, and increasing charging speed,[18] among others. Research has been under way in the area of non-flammable electrolytes as a pathway to increased safety based on the flammability and volatility of the organic solvents used in the typical electrolyte. Strategies include aqueous lithium-ion batteries, ceramic solid electrolytes, polymer electrolytes, ionic liquids, and heavily fluorinated systems.[19][20][21][22]

Terminology

Battery versus cell

A cell is a basic electrochemical unit that contains the electrodes, separator, and electrolyte.[23][24]

A battery or battery pack is a collection of cells or cell assemblies, with housing, electrical connections, and possibly electronics for control and protection.[25][26]

Anode and cathode electrodes

For rechargeable cells, the term anode (or negative electrode) designates the electrode where oxidation is taking place during the discharge cycle; the other electrode is the cathode (or positive electrode). During the charge cycle, the positive electrode becomes the anode and the negative electrode becomes the cathode. For most lithium-ion cells, the lithium-oxide electrode is the positive electrode; for titanate lithium-ion cells (LTO), the lithium-oxide electrode is the negative electrode.

History

See also: History of the battery

Background

Varta lithium-ion battery, Museum Autovision, Altlussheim, Germany

Lithium batteries were proposed by British chemist and co-recipient of the 2019 Nobel prize for chemistry M. Stanley Whittingham, now at Binghamton University, while working for Exxon in the 1970s.[27] Whittingham used titanium(IV) sulfide and lithium metal as the electrodes. However, this rechargeable lithium battery could never be made practical. Titanium disulfide was a poor choice, since it has to be synthesized under completely sealed conditions, also being quite expensive (~$1,000 per kilogram for titanium disulfide raw material in 1970s). When exposed to air, titanium disulfide reacts to form hydrogen sulfide compounds, which have an unpleasant odour and are toxic to most animals. For this, and other reasons, Exxon discontinued development of Whittingham's lithium-titanium disulfide battery.[28] Batteries with metallic lithium electrodes presented safety issues, as lithium metal reacts with water, releasing flammable hydrogen gas.[29] Consequently, research moved to develop batteries in which, instead of metallic lithium, only lithium compounds are present, being capable of accepting and releasing lithium ions.

Reversible intercalation in graphite[30][31] and intercalation into cathodic oxides[32][33] was discovered during 1974–76 by J. O. Besenhard at TU Munich. Besenhard proposed its application in lithium cells.[34][35] Electrolyte decomposition and solvent co-intercalation into graphite were severe early drawbacks for battery life.

Development

• 1973 – Adam Heller proposed the lithium thionyl chloride battery, still used in implanted medical devices and in defense systems where a greater than 20-year shelf life, high energy density, and/or tolerance for extreme operating temperatures are required.[36]
• 1977 – Samar Basu demonstrated electrochemical intercalation of lithium in graphite at the University of Pennsylvania.[37][38] This led to the development of a workable lithium intercalated graphite electrode at Bell Labs (LiC
  ₆)[39] to provide an alternative to the lithium metal electrode battery.
• 1979 – Working in separate groups, Ned A. Godshall et al.,[40][41][42] and, shortly thereafter, John B. Goodenough (Oxford University) and Koichi Mizushima (Tokyo University), demonstrated a rechargeable lithium cell with voltage in the 4 V range using lithium cobalt dioxide (LiCoO
  ₂) as the positive electrode and lithium metal as the negative electrode.[43][44] This innovation provided the positive electrode material that enabled early commercial lithium batteries. LiCoO
  ₂ is a stable positive electrode material which acts as a donor of lithium ions, which means that it can be used with a negative electrode material other than lithium metal.[45] By enabling the use of stable and easy-to-handle negative electrode materials, LiCoO
  ₂ enabled novel rechargeable battery systems. Godshall et al. further identified the similar value of ternary compound lithium-transition metal-oxides such as the spinel LiMn₂O₄, Li₂MnO₃, LiMnO₂, LiFeO₂, LiFe₅O₈, and LiFe₅O₄ (and later lithium-copper-oxide and lithium-nickel-oxide cathode materials in 1985)[46]
• 1980 – Rachid Yazami demonstrated the reversible electrochemical intercalation of lithium in graphite,[47][48] and invented the lithium graphite electrode (anode).[49][10] The organic electrolytes available at the time would decompose during charging with a graphite negative electrode. Yazami used a solid electrolyte to demonstrate that lithium could be reversibly intercalated in graphite through an electrochemical mechanism. As of 2011, Yazami's graphite electrode was the most commonly used electrode in commercial lithium-ion batteries.
• The negative electrode has its origins in PAS (polyacenic semiconductive material) discovered by Tokio Yamabe and later by Shjzukuni Yata in the early 1980s.[50][51][52][53] The seed of this technology was the discovery of conductive polymers by Professor Hideki Shirakawa and his group, and it could also be seen as having started from the polyacetylene lithium ion battery developed by Alan MacDiarmid and Alan J. Heeger et al.[54]
• 1982 – Godshall et al. were awarded U.S. Patent 4,340,652[55] for the use of LiCoO₂ as cathodes in lithium batteries, based on Godshall's Stanford University Ph.D. dissertation and 1979 publications.
• 1983 – Michael M. Thackeray, Peter Bruce, William David, and John Goodenough developed a manganese spinel as a commercially relevant charged cathode material for lithium-ion batteries.[56]
• 1985 – Akira Yoshino assembled a prototype cell using carbonaceous material into which lithium ions could be inserted as one electrode, and lithium cobalt oxide (LiCoO
  ₂) as the other.[57] This dramatically improved safety. LiCoO
  ₂ enabled industrial-scale production and enabled the commercial lithium-ion battery.
• 1989 – Arumugam Manthiram and John B. Goodenough discovered the polyanion class of cathodes.[58][59] They showed that positive electrodes containing polyanions, e.g., sulfates, produce higher voltages than oxides due to the inductive effect of the polyanion. This polyanion class contains materials such as lithium iron phosphate.[60]

Commercialization and advances

The performance and capacity of lithium-ion batteries increased as development progressed.

• 1991 – Sony and Asahi Kasei released the first commercial lithium-ion battery.[61] The Japanese team that successfully commercialized the technology was led by Yoshio Nishi.[13]
• 1996 – Akshaya Padhi, KS Nanjundawamy and Goodenough identified LiFePO₄ (LFP) as a cathode material.[62]
• 1996 – Goodenough, Akshaya Padhi and coworkers proposed lithium iron phosphate (LiFePO
  ₄) and other phospho-olivines (lithium metal phosphates with the same structure as mineral olivine) as positive electrode materials.[63]
• 1998 – C. S. Johnson, J. T. Vaughey, M. M. Thackeray, T. E. Bofinger, and S. A. Hackney report the discovery of the high capacity high voltage lithium-rich NMC cathode materials.[64]
• 2001 – Arumugam Manthiram and co-workers discovered that the capacity limitations of layered oxide cathodes is a result of chemical instability that can be understood based on the relative positions of the metal 3d band relative to the top of the oxygen 2p band.[65][66][67] This discovery has had significant implications for the practically accessible compositional space of lithium ion battery layered oxide cathodes, as well as their stability from a safety perspective.
• 2001 – Christopher Johnson, Michael Thackeray, Khalil Amine, and Jaekook Kim file a patent[68][69] for NMC lithium rich cathodes based on a domain structure.
• 2001 – Zhonghua Lu and Jeff Dahn file a patent[70] for the lithium nickel manganese cobalt oxide (NMC) class of positive electrode materials, which offers safety and energy density improvements over the widely used lithium cobalt oxide.
• 2002 – Yet-Ming Chiang and his group at MIT showed a substantial improvement in the performance of lithium batteries by boosting the material's conductivity by doping it[71] with aluminium, niobium and zirconium. The exact mechanism causing the increase became the subject of widespread debate.[72]
• 2004 – Yet-Ming Chiang again increased performance by utilizing lithium iron phosphate particles of less than 100 nanometers in diameter. This decreased particle density almost one hundredfold, increased the positive electrode's surface area and improved capacity and performance. Commercialization led to a rapid growth in the market for higher capacity LIBs, as well as a patent infringement battle between Chiang and John Goodenough.[72]
• 2005 – Y Song, PY Zavalij, and M. Stanley Whittingham report a new two-electron vanadium phosphate cathode material with high energy density[73][74]
• 2011 – Lithium nickel manganese cobalt oxide (NMC) cathodes, developed at Argonne National Laboratory, are manufactured commercially by BASF in Ohio.[75]
• 2011 – Lithium-ion batteries accounted for 66% of all portable secondary (i.e., rechargeable) battery sales in Japan.[76]
• 2012 – John Goodenough, Rachid Yazami and Akira Yoshino received the 2012 IEEE Medal for Environmental and Safety Technologies for developing the lithium ion battery.[10]
• 2014 – John Goodenough, Yoshio Nishi, Rachid Yazami and Akira Yoshino were awarded the Charles Stark Draper Prize of the National Academy of Engineering for their pioneering efforts in the field.[77]
• 2014 – Commercial batteries from Amprius Corp. reached 650 Wh/L (a 20% increase), using a silicon anode and were delivered to customers.[78]
• 2016 – Koichi Mizushima and Akira Yoshino received the NIMS Award from the National Institute for Materials Science, for Mizushima's discovery of the LiCoO₂ cathode material for the lithium-ion battery and Yoshino's development of the lithium-ion battery.[12]
• 2016 – Z. Qi, and Gary Koenig reported a scalable method to produce sub-micrometer sized LiCoO
  ₂ using a template-based approach.[79]
• 2019 – The Nobel Prize in Chemistry was given to John Goodenough, Stanley Whittingham and Akira Yoshino "for the development of lithium ion batteries".[11]

As of 2016, global lithium-ion battery production capacity was 28 gigawatt-hours, with 16.4 GWh in China.[80]

Market

Industry produced about 660 million cylindrical lithium-ion cells in 2012; the 18650 size is by far the most popular for cylindrical cells. If Tesla were to have met its goal of shipping 40,000 Model S electric cars in 2014 and if the 85-kWh battery, which uses 7,104 of these cells, had proved as popular overseas as it was in the United States, a 2014 study projected that the Model S alone would use almost 40 percent of estimated global cylindrical battery production during 2014.[81] As of 2013, production was gradually shifting to higher-capacity 3,000+ mAh cells. Annual flat polymer cell demand was expected to exceed 700 million in 2013.[82]

In 2015, cost estimates ranged from $300–500/kWh.[83] In 2016 GM revealed they would be paying US$145/kWh for the batteries in the Chevy Bolt EV.[84] In 2017, the average residential energy storage systems installation cost was expected to drop from 1600 $/kWh in 2015 to 250 $/kWh by 2040 and to see the price with 70% reduction by 2030.[85] In 2019, some electric vehicle battery pack costs were estimated at $150-200,[86] and VW noted it was paying US$100/kWh for its next generation of electric vehicles.[87]

For a Li-ion storage coupled with photovoltaics and an anaerobic digestion biogas power plant, Li-ion will generate a higher profit if it is cycled more frequently (hence a higher lifetime electricity output) although the lifetime is reduced due to degradation.[88]

NMC comes in several commercial types, specified by the ratio of component metals. NMC 111 (or NMC 333) have equal parts of nickel, manganese and cobalt, whereas NMC 532 has 5 parts nickel, 3 parts manganese and 2 parts cobalt. As of 2019, NMC 532 and NMC 622 were the preferred low-cobalt types for electric vehicles, with NMC 811 and even lower cobalt ratios seeing increasing use, mitigating cobalt dependency.[89][90][86] However, cobalt for electric vehicles increased 81% from the first half of 2018 to 7,200 tonnes in the first half of 2019, for a battery capacity of 46.3 GWh.[91]

Construction

Cylindrical Panasonic 18650 lithium-ion battery cell before closing.

Lithium-ion battery monitoring electronics (over-charge and deep-discharge protection)

An 18650 size lithium ion battery, with an alkaline AA for scale. 18650 are used for example in notebooks or Tesla Model S

The three primary functional components of a lithium-ion battery are the positive and negative electrodes and electrolyte. Generally, the negative electrode of a conventional lithium-ion cell is made from carbon. The positive electrode is typically a metal oxide. The electrolyte is a lithium salt in an organic solvent.[92] The electrochemical roles of the electrodes reverse between anode and cathode, depending on the direction of current flow through the cell.

The most commercially popular anode (negative electrode) is graphite. The positive electrode is generally one of three materials: a layered oxide (such as lithium cobalt oxide), a polyanion (such as lithium iron phosphate) or a spinel (such as lithium manganese oxide).[93] Recently, graphene containing electrodes (based on 2D and 3D structures of graphene) have also been used as components of electrodes for lithium batteries.[94]

The electrolyte is typically a mixture of organic carbonates such as ethylene carbonate or diethyl carbonate containing complexes of lithium ions.[95] These non-aqueous electrolytes generally use non-coordinating anion salts such as lithium hexafluorophosphate (LiPF
₆), lithium hexafluoroarsenate monohydrate (LiAsF
₆), lithium perchlorate (LiClO
₄), lithium tetrafluoroborate (LiBF
₄), and lithium triflate (LiCF
₃SO
₃).

Depending on materials choices, the voltage, energy density, life, and safety of a lithium-ion battery can change dramatically. Current effort has been exploring the use of novel architectures using nanotechnology have been employed to improve performance. Areas on interest include nano-scale electrode materials and alternative electrode structures.[96]

Pure lithium is highly reactive. It reacts vigorously with water to form lithium hydroxide (LiOH) and hydrogen gas. Thus, a non-aqueous electrolyte is typically used, and a sealed container rigidly excludes moisture from the battery pack.

Lithium-ion batteries are more expensive than NiCd batteries but operate over a wider temperature range with higher energy densities. They require a protective circuit to limit the peak voltage.

The battery pack of a laptop computer, for each lithium-ion cell, will contain

• a temperature sensor
• a voltage regulator circuit
• a voltage tap
• a charge-state monitor
• a mains connector

These components

• monitor the charge-state and current flow
• record the latest, full-charge capacity
• monitor the temperature

Their design will minimize the risk of short circuits.[97]

Shapes

Nissan Leaf's lithium-ion battery pack.

Li-ion cells (as distinct from entire batteries) are available in various shapes, which can generally be divided into four groups:[98]

• Small cylindrical (solid body without terminals, such as those used in older laptop batteries)
• Large cylindrical (solid body with large threaded terminals)
• Flat or pouch (soft, flat body, such as those used in cell phones and newer laptops; these are lithium-ion polymer batteries.[99]
• Rigid plastic case with large threaded terminals (such as electric vehicle traction packs)

Cells with a cylindrical shape are made in a characteristic "swiss roll" manner (known as a "jelly roll" in the US), which means it is a single long 'sandwich' of the positive electrode, separator, negative electrode, and separator rolled into a single spool. The shape of the jelly roll in cylindrical cells can be approximated by an Archimedean spiral. One advantage of cylindrical cells compared to cells with stacked electrodes is the faster production speed. One disadvantage of cylindrical cells can be a large radial temperature gradient inside the cells developing at high discharge currents.

The absence of a case gives pouch cells the highest gravimetric energy density; however, for many practical applications they still require an external means of containment to prevent expansion when their state-of-charge (SOC) level is high,[100] and for general structural stability of the battery pack of which they are part. Both rigid plastic and pouch-style cells are sometimes referred to as prismatic cells due to their rectangular shapes.[101] Battery technology analyst Mark Ellis of Munro & Associates sees three basic Li-ion battery types used in modern (~2020) electric vehicle batteries at scale: cylindrical cells (e.g., Tesla), prismatic pouch (e.g., from LG), and prismatic can cells (e.g., from LG, Samsung, Panasonic, and others). Each form factor has characteristic advantages and disadvantages for EV use.[17]

Since 2011, several research groups have announced demonstrations of lithium-ion flow batteries that suspend the cathode or anode material in an aqueous or organic solution.[102][103]

In 2014, Panasonic created the smallest Li-ion battery. It is pin shaped. It has a diameter of 3.5mm and a weight of 0.6g.[104] A coin cell form factor resembling that of ordinary lithium batteries is available since as early as 2006 for LiCoO₂ cells, usually designated with a "LiR" prefix.[105][106]

Electrochemistry

The reactants in the electrochemical reactions in a lithium-ion cell are materials of anode and cathode, both of which are compounds containing lithium atoms. During discharge an oxidation reaction at the anode produces positively charged lithium ions and negatively charged electrons, as well as uncharged material that remains at the anode; after transport of the lithium ions through the electrolyte and of electrons through an external circuit, they recombine at the cathode together with the cathode material in a reduction reaction. The electrolyte and external circuit provide conductive media for lithium ions and electrons, respectively, but do not partake in the electrochemical reaction. With electrons flowing towards the cathode during discharge, the electrode at that side of the cell is the positive one. The reactions during discharge lower the chemical potential of the cell, so discharging transfers energy from the cell to wherever the electric current dissipates its energy, usually in the external circuit. During charging these reactions and transports take place in the opposite direction; with electrons now moving from (still positive terminal) anode to cathode (anode and cathode change places during charge and discharge), the external circuit has to provide electric energy for charging to occur, and this energy is then (with some loss) stored as chemical energy in the cell.

Both electrodes allow lithium ions to move in and out of their structures with a process called insertion (intercalation) or extraction (deintercalation), respectively. As the lithium ions "rock" back and forth between the two electrodes, these batteries are also known as "rocking-chair batteries" or "swing batteries" (a term given by some European industries).[107][108] During discharge, the (positive) lithium ions move from the negative electrode (anode) (usually graphite = "${\displaystyle {\ce {C6}}}$" as below) to the positive electrode (cathode) (forming a lithium compound) through the electrolyte while the electrons flow through the external circuit in the same direction.[109] When the cell is charging, the reverse occurs with the lithium ions and electrons move back into the negative electrode in a net higher energy state. The following equations exemplify the chemistry.

The positive electrode (cathode) half-reaction in the lithium-doped cobalt oxide substrate is[110][111]

${\displaystyle {\ce {CoO2 + Li+ + e- <=> LiCoO2}}}$

The negative electrode (anode) half-reaction for the graphite is

${\displaystyle {\ce {LiC6 <=> C6 + Li+ + e^-}}}$

The full reaction (left to right: discharging, right to left: charging) being

${\displaystyle {\ce {LiC6 + CoO2 <=> C6 + LiCoO2}}}$

The overall reaction has its limits. Overdischarging supersaturates lithium cobalt oxide, leading to the production of lithium oxide,[112] possibly by the following irreversible reaction:

${\displaystyle {\ce {Li+ + e^- + LiCoO2 -> Li2O + CoO}}}$

Overcharging up to 5.2 volts leads to the synthesis of cobalt(IV) oxide, as evidenced by x-ray diffraction:[113]

${\displaystyle {\ce {LiCoO2 -> Li+ + CoO2 + e^-}}}$

In a lithium-ion battery, the lithium ions are transported to and from the positive or negative electrodes by oxidizing the transition metal, cobalt (Co), in Li
_1-xCoO
₂ from Co³⁺
to Co⁴⁺
during charge, and reducing from Co⁴⁺
to Co³⁺
during discharge. The cobalt electrode reaction is only reversible for x < 0.5 (x in mole units), limiting the depth of discharge allowable. This chemistry was used in the Li-ion cells developed by Sony in 1990.[114]

The cell's energy is equal to the voltage times the charge. Each gram of lithium represents Faraday's constant/6.941, or 13,901 coulombs. At 3 V, this gives 41.7 kJ per gram of lithium, or 11.6 kWh per kilogram of lithium. This is a bit more than the heat of combustion of gasoline, but does not consider the other materials that go into a lithium battery and that make lithium batteries many times heavier per unit of energy.

Electrolytes

The cell voltages given in the Electrochemistry section are larger than the potential at which aqueous solutions will electrolyze.

Liquid electrolytes

Liquid electrolytes in lithium-ion batteries consist of lithium salts, such as LiPF
₆, LiBF
₄ or LiClO
₄ in an organic solvent, such as ethylene carbonate, dimethyl carbonate, and diethyl carbonate.[115] A liquid electrolyte acts as a conductive pathway for the movement of cations passing from the negative to the positive electrodes during discharge. Typical conductivities of liquid electrolyte at room temperature (20 °C (68 °F)) are in the range of 10 mS/cm, increasing by approximately 30–40% at 40 °C (104 °F) and decreasing slightly at 0 °C (32 °F).[116]

The combination of linear and cyclic carbonates (e.g., ethylene carbonate (EC) and dimethyl carbonate (DMC)) offers high conductivity and solid electrolyte interphase (SEI)-forming ability.

Organic solvents easily decompose on the negative electrodes during charge. When appropriate organic solvents are used as the electrolyte, the solvent decomposes on initial charging and forms a solid layer called the solid electrolyte interphase,[117] which is electrically insulating, yet provides significant ionic conductivity. The interphase prevents further decomposition of the electrolyte after the second charge. For example, ethylene carbonate is decomposed at a relatively high voltage, 0.7 V vs. lithium, and forms a dense and stable interface.[118]

Composite electrolytes based on POE (poly(oxyethylene)) provide a relatively stable interface.[119][120] It can be either solid (high molecular weight) and be applied in dry Li-polymer cells, or liquid (low molecular weight) and be applied in regular Li-ion cells.

Room-temperature ionic liquids (RTILs) are another approach to limiting the flammability and volatility of organic electrolytes.[121]

Solid electrolytes

Recent advances in battery technology involve using a solid as the electrolyte material. The most promising of these are ceramics.[122]

Solid ceramic electrolytes are mostly lithium metal oxides, which allow lithium ion transport through the solid more readily due to the intrinsic lithium. The main benefit of solid electrolytes is that there is no risk of leaks, which is a serious safety issue for batteries with liquid electrolytes.[123]

Solid ceramic electrolytes can be further broken down into two main categories: ceramic and glassy. Ceramic solid electrolytes are highly ordered compounds with crystal structures that usually have ion transport channels.[124] Common ceramic electrolytes are lithium super ion conductors (LISICON) and perovskites. Glassy solid electrolytes are amorphous atomic structures made up of similar elements to ceramic solid electrolytes, but have higher conductivities overall due to higher conductivity at grain boundaries.[125]

Both glassy and ceramic electrolytes can be made more ionically conductive by substituting sulfur for oxygen. The larger radius of sulfur and its higher ability to be polarized allow higher conductivity of lithium. This contributes to conductivities of solid electrolytes are nearing parity with their liquid counterparts, with most on the order of 0.1 mS/cm and the best at 10 mS/cm.[126]

Charge and discharge

During discharge, lithium ions (Li⁺
) carry the current within the battery from the negative to the positive electrode, through the non-aqueous electrolyte and separator diaphragm.[127]

During charging, an external electrical power source (the charging circuit) applies an over-voltage (a higher voltage than the battery produces, of the same polarity), forcing a charging current to flow within the battery from the positive to the negative electrode, i.e. in the reverse direction of a discharge current under normal conditions. The lithium ions then migrate from the positive to the negative electrode, where they become embedded in the porous electrode material in a process known as intercalation.

Energy losses arising from electrical contact resistance at interfaces between electrode layers and at contacts with current-collectors can be as high as 20% of the entire energy flow of batteries under typical operating conditions.[128]

Procedure

The charging procedures for single Li-ion cells, and complete Li-ion batteries, are slightly different.

• A single Li-ion cell is charged in two stages:[129]

1. Constant current (CC).
2. Constant voltage (CV).

• A Li-ion battery (a set of Li-ion cells in series) is charged in three stages:

1. Constant current.
2. Balance (not required once a battery is balanced).
3. Constant voltage.

During the constant current phase, the charger applies a constant current to the battery at a steadily increasing voltage, until the voltage limit per cell is reached.

During the balance phase, the charger reduces the charging current (or cycles the charging on and off to reduce the average current) while the state of charge of individual cells is brought to the same level by a balancing circuit, until the battery is balanced. Some fast chargers skip this stage. Some chargers accomplish the balance by charging each cell independently.

During the constant voltage phase, the charger applies a voltage equal to the maximum cell voltage times the number of cells in series to the battery, as the current gradually declines towards 0, until the current is below a set threshold of about 3% of initial constant charge current.

Periodic topping charge about once per 500 hours. Top charging is recommended to be initiated when voltage goes below 4.05 V/cell.

Failure to follow current and voltage limitations can result in an explosion.[130][131]

Extreme temperatures

Charging temperature limits for Li-ion are stricter than the operating limits. Lithium-ion chemistry performs well at elevated temperatures but prolonged exposure to heat reduces battery life.

Li‑ion batteries offer good charging performance at cooler temperatures and may even allow 'fast-charging' within a temperature range of 5 to 45 °C (41 to 113 °F).[132] Charging should be performed within this temperature range. At temperatures from 0 to 5 °C charging is possible, but the charge current should be reduced. During a low-temperature charge, the slight temperature rise above ambient due to the internal cell resistance is beneficial. High temperatures during charging may lead to battery degradation and charging at temperatures above 45 °C will degrade battery performance, whereas at lower temperatures the internal resistance of the battery may increase, resulting in slower charging and thus longer charging times.[132]

Consumer-grade lithium-ion batteries should not be charged at temperatures below 0 °C (32 °F). Although a battery pack[133] may appear to be charging normally, electroplating of metallic lithium can occur at the negative electrode during a subfreezing charge, and may not be removable even by repeated cycling. Most devices equipped with Li-ion batteries do not allow charging outside of 0–45 °C for safety reasons, except for mobile phones that may allow some degree of charging when they detect an emergency call in progress.[134]

Performance

• Specific energy density: 100 to 250 W·h/kg (360 to 900 kJ/kg)[135]
• Volumetric energy density: 250 to 680 W·h/L (900 to 2230 J/cm³)[2][136]
• Specific power density: 300 to 1500 W/kg (at 20 seconds and 285 W·h/L)[1]

Because lithium-ion batteries can have a variety of positive and negative electrode materials, the energy density and voltage vary accordingly.

The open circuit voltage is higher than aqueous batteries (such as lead acid, nickel-metal hydride and nickel-cadmium).[137] Internal resistance increases with both cycling and age.[137][138] Rising internal resistance causes the voltage at the terminals to drop under load, which reduces the maximum current draw. Eventually, increasing resistance will leave the battery in a state such that it can no longer support the normal discharge currents requested of it without unacceptable voltage drop or overheating.

Batteries with a lithium iron phosphate positive and graphite negative electrodes have a nominal open-circuit voltage of 3.2 V and a typical charging voltage of 3.6 V. Lithium nickel manganese cobalt (NMC) oxide positives with graphite negatives have a 3.7 V nominal voltage with a 4.2 V maximum while charging. The charging procedure is performed at constant voltage with current-limiting circuitry (i.e., charging with constant current until a voltage of 4.2 V is reached in the cell and continuing with a constant voltage applied until the current drops close to zero). Typically, the charge is terminated at 3% of the initial charge current. In the past, lithium-ion batteries could not be fast-charged and needed at least two hours to fully charge. Current-generation cells can be fully charged in 45 minutes or less. In 2015 researchers demonstrated a small 600 mAh capacity battery charged to 68 percent capacity in two minutes and a 3,000 mAh battery charged to 48 percent capacity in five minutes. The latter battery has an energy density of 620 W·h/L. The device employed heteroatoms bonded to graphite molecules in the anode.[139]

Performance of manufactured batteries has improved over time. For example, from 1991 to 2005 the energy capacity per price of lithium ion batteries improved more than ten-fold, from 0.3 W·h per dollar to over 3 W·h per dollar.[140] In the period from 2011–2017, progress has averaged 7.5% annually.[141] Differently sized cells with similar chemistry also have the same energy density. The 21700 cell has 50% more energy than the 18650 cell, and the bigger size reduces heat transfer to its surroundings.[136]

Materials

The increasing demand for batteries has led vendors and academics to focus on improving the energy density, operating temperature, safety, durability, charging time, output power, and cost of lithium ion battery technology. The following materials have been used in commercially available cells. Research into other materials continues.

Cathode materials are generally constructed from LiCoO
₂ or LiMn
₂O
₄. The cobalt-based material develops a pseudo tetrahedral structure that allows for two-dimensional lithium ion diffusion.[142] The cobalt-based cathodes are ideal due to their high theoretical specific heat capacity, high volumetric capacity, low self-discharge, high discharge voltage, and good cycling performance. Limitations include the high cost of the material, and low thermal stability.[143] The manganese-based materials adopt a cubic crystal lattice system, which allows for three-dimensional lithium ion diffusion.[142] Manganese cathodes are attractive because manganese is cheaper and because it could theoretically be used to make a more efficient, longer-lasting battery if its limitations could be overcome. Limitations include the tendency for manganese to dissolve into the electrolyte during cycling leading to poor cycling stability for the cathode.[143] Cobalt-based cathodes are the most common, however other materials are being researched with the goal of lowering costs and improving battery life.[144]

As of 2017, LiFePO
₄ is a candidate for large-scale production of lithium-ion batteries such as electric vehicle applications due to its low cost, excellent safety, and high cycle durability. For example, Sony Fortelion batteries have retained 74% of their capacity after 8000 cycles with 100% discharge.[145] A carbon conductive agent is required to overcome its low electrical conductivity.[146]

Electrolyte alternatives have also played a significant role, for example the lithium polymer battery.

Positive electrode

Positive electrode

Technology	Company	Target application	Date	Benefit
Lithium nickel manganese cobalt oxide ("NMC", LiNixMnyCozO2)	Imara Corporation, Nissan Motor,[147][148] Microvast Inc., LG Chem[149], Northvolt[150]	Electric vehicles, power tools, grid energy storage	2008	good specific energy and specific power density
Lithium Nickel Cobalt Aluminium Oxide ("NCA", LiNiCoAlO2)	Panasonic,[149] Saft Groupe S.A.[151] Samsung[152]	Electric vehicles	1999	High specific energy, good life span
Lithium Manganese Oxide ("LMO", LiMn2O4)	LG Chem,[153] NEC, Samsung,[154] Hitachi,[155] Nissan/AESC,[156] EnerDel[157]	Hybrid electric vehicle, cell phone, laptop	1996
Lithium Iron Phosphate ("LFP", LiFePO4)	University of Texas/Hydro-Québec,[158] Phostech Lithium Inc., Valence Technology, A123Systems/MIT[159][160]	Segway Personal Transporter, power tools, aviation products, automotive hybrid systems, PHEV conversions	1996	moderate density (2 A·h outputs 70 amperes) High safety compared to Cobalt / Manganese systems. Operating temperature >60 °C (140 °F)
Lithium Cobalt Oxide (LiCoO2, "LCO")	Sony first commercial production[61][114]	broad use, laptop	1991	High specific energy

Negative electrode

Negative electrode materials are traditionally constructed from graphite and other carbon materials, although newer silicon based materials are being increasingly used (see Nanowire battery). These materials are used because they are abundant and are electrically conducting and can intercalate lithium ions to store electrical charge with modest volume expansion (ca. 10%).[161] The reason that graphite is the dominant material is because of its low voltage and excellent performance. Various materials have been introduced but their voltage is high leading to a low energy density.[162] Low voltage of material is the key requirement; otherwise, the excess capacity is useless in terms of energy density.

Negative electrode

Technology	Density	Durability	Company	Target application	Date	Comments
Graphite			Targray	The dominant negative electrode material used in lithium ion batteries.	1991	Low cost and good energy density. Graphite anodes can accommodate one lithium atom for every six carbon atoms. Charging rate is governed by the shape of the long, thin graphene sheets. While charging, the lithium ions must travel to the outer edges of the graphene sheet before coming to rest (intercalating) between the sheets. The circuitous route takes so long that they encounter congestion around those edges.[163]
Lithium Titanate ("LTO", Li4Ti5O12)			Toshiba, Altairnano	Automotive (Phoenix Motorcars), electrical grid (PJM Interconnection Regional Transmission Organization control area,[164] United States Department of Defense[165]), bus (Proterra)	2008	Improved output, charging time, durability (safety, operating temperature −50–70 °C (−58–158 °F)).[166]
Hard Carbon			Energ2[167]	Home electronics	2013	Greater storage capacity.
Tin/Cobalt Alloy			Sony	Consumer electronics (Sony Nexelion battery)	2005	Larger capacity than a cell with graphite (3.5Ah 18650-type battery).
Silicon/Carbon	Volumetric: 580 W·h/l		Amprius[168]	Smartphones, providing 5000 mA·h capacity	2013	Uses < 10wt% Silicon nanowires combined with graphite and binders. Energy density: ~74 mAh/g. Another approach used carbon-coated 15 nm thick crystal silicon flakes. The tested half-cell achieved 1.2 Ah/g over 800 cycles.[169]

Anode research

Main article: Research in lithium-ion batteries § Anode

The extensive 2007 Review Article by Kasavajjula et al.[170] summarizes early research on silicon-based anodes for lithium-ion secondary cells. In particular, Hong Li et al.[171] showed in 2000 that the electrochemical insertion of lithium ions in silicon nanoparticles and silicon nanowires leads to the formation of an amorphous Li-Si alloy. The same year, Bo Gao and his doctoral advisor, Professor Otto Zhou described the cycling of electrochemical cells with anodes comprising silicon nanowires, with a reversible capacity ranging from at least approximately 900 to 1500 mAh/g.[172]

To improve stability of the lithium anode, several approaches of installing a protective layer have been suggested.[173] Silicon is beginning to be looked at as an anode material because it can accommodate significantly more lithium ions, storing up to 10 times the electric charge, however this alloying between lithium and silicon results in significant volume expansion (ca. 400%),[161] which causes catastrophic failure for the battery.[174] Silicon has been used as an anode material but the insertion and extraction of ${\displaystyle {\ce {\scriptstyle Li+}}}$ can create cracks in the material. These cracks expose the Si surface to an electrolyte, causing decomposition and the formation of a solid electrolyte interphase (SEI) on the new Si surface (crumpled graphene encapsulated Si nanoparticles). This SEI will continue to grow thicker, deplete the available ${\displaystyle {\ce {\scriptstyle Li+}}}$, and degrade the capacity and cycling stability of the anode.

There have been attempts using various Si nanostructures that include nanowires, nanotubes, hollow spheres, nanoparticles, and nanoporous with the goal of them withstanding the (${\displaystyle {\ce {\scriptstyle Li+}}}$)-insertion/removal without significant cracking. Yet the formation of SEI on Si still occurs. So a coating would be logical, in order to account for any increase in the volume of the Si, a tight surface coating is not viable. In 2012, researchers from Northwestern University created an approach to encapsulate Si nanoparticles using crumpled r-GO, graphene oxide. This method allows for protection of the Si nanoparticles from the electrolyte as well as allow for the expansion of Si without expansion due to the wrinkles and creases in the graphene balls.[175]

These capsules began as an aqueous dispersion of GO and Si particles, and are then nebulized into a mist of droplets that pass through a tube furnace. As they pass through the liquid evaporates, the GO sheets are pulled into a crumpled ball by capillary forces and encapsulate Si particles with them. There is a galvanostatic charge/discharge profile of 0.05 ${\displaystyle {\ce {\scriptstyle mA/cm^{2}}}}$ to 1 ${\displaystyle {\ce {\scriptstyle mA/cm^{2}}}}$ for current densities 0.2 to 4 A/g, delivering 1200 mAh/g at 0.2 A/g.[175]

Polymer electrolytes are promising for minimizing the dendrite formation of lithium. Polymers are supposed to prevent short circuits and maintain conductivity.[173]

Diffusion

The ions in the electrolyte diffuse because there are small changes in the electrolyte concentration. Linear diffusion is only considered here. The change in concentration c, as a function of time t and distance x, is

${\displaystyle {\frac {\partial c}{\partial t}}=-{\frac {D}{\varepsilon }}{\frac {\partial ^{2}c}{\partial x^{2}}}.}$

The negative sign indicates that the ions are flowing from high concentration to low concentration. In this equation, D is the diffusion coefficient for the lithium ion. It has a value of 7.5×10⁻¹⁰ m²/s in the LiPF
₆ electrolyte. The value for ε, the porosity of the electrolyte, is 0.724.[176]

Use

Li-ion batteries provide lightweight, high energy density power sources for a variety of devices. To power larger devices, such as electric cars, connecting many small batteries in a parallel circuit is more effective[177] and more efficient than connecting a single large battery.[178] Such devices include:

• Portable devices: these include mobile phones and smartphones, laptops and tablets, digital cameras and camcorders, electronic cigarettes, handheld game consoles and torches (flashlights).
• Power tools: Li-ion batteries are used in tools such as cordless drills, sanders, saws, and a variety of garden equipment including whipper-snippers and hedge trimmers.[179]
• Electric vehicles: electric vehicle batteries are used in electric cars,[180] hybrid vehicles, electric motorcycles and scooters, electric bicycles, personal transporters and advanced electric wheelchairs. Also radio-controlled models, model aircraft, aircraft,[181][182][183] and the Mars Curiosity rover.

Li-ion batteries are used in telecommunications applications. Secondary non-aqueous lithium batteries provide reliable backup power to load equipment located in a network environment of a typical telecommunications service provider. Li-ion batteries compliant with specific technical criteria are recommended for deployment in the Outside Plant (OSP) at locations such as Controlled Environmental Vaults (CEVs), Electronic Equipment Enclosures (EEEs), and huts, and in uncontrolled structures such as cabinets. In such applications, li-ion battery users require detailed, battery-specific hazardous material information, plus appropriate fire-fighting procedures, to meet regulatory requirements and to protect employees and surrounding equipment.[184]

Self-discharge

A lithium-ion battery from a laptop computer (176 kJ)

Batteries gradually self-discharge even if not connected and delivering current. Li-ion rechargeable batteries have a self-discharge rate typically stated by manufacturers to be 1.5–2% per month.[185][186]

The rate increases with temperature and state of charge. A 2004 study found that for most cycling conditions self-discharge was primarily time-dependent; however, after several months of stand on open circuit or float charge, state-of-charge dependent losses became significant. The self-discharge rate did not increase monotonically with state-of-charge, but dropped somewhat at intermediate states of charge.[187] Self-discharge rates may increase as batteries age.[188] In 1999, self-discharge per month was measured at 8% at 21 °C, 15% at 40 °C, 31% at 60 °C.[189] By 2007, monthly self-discharge rate was estimated at 2% to 3%,[190] and 2[7]–3% by 2016.[191]

By comparison, the self-discharge rate for NiMH batteries dropped, as of 2017, from up to 30% per month for previously common cells[192] to about 0.08–0.33% per month for low self-discharge NiMH batteries,[193] and is about 10% per month in NiCd batteries.

Battery life

Life of a lithium-ion battery is typically defined as the number of full charge-discharge cycles to reach a failure threshold in terms of capacity loss or impedance rise. Manufacturers' datasheet typically uses the word "cycle life" to specify lifespan in terms of the number of cycles to reach 80% of the rated battery capacity.[194] Inactive storage of these batteries also reduces their capacity. Calendar life is used to represent the whole life cycle of battery involving both the cycle and inactive storage operations.

Battery cycle life is affected by many different stress factors including temperature, discharge current, charge current, and state of charge ranges (depth of discharge).[195][196] Batteries are not fully charged and discharged in real applications such as smartphones, laptops and electric cars and hence defining battery life via full discharge cycles can be misleading. To avoid this confusion, researchers sometimes use cumulative discharge[195] defined as the total amount of charge (Ah) delivered by the battery during its entire life or equivalent full cycles,[197] which represents the summation of the partial cycles as fractions of a full charge-discharge cycle. Battery degradation during the storage is affected by temperature and battery state of charge (SOC) and a combination of full charge (100% SOC) and high temperature (usually > 50 °C) can result in sharp capacity drop and gas generation.[198]

Multiplying the battery cumulative discharge (in Ah) by the rated nominal Voltage gives the total energy delivered over the life of the battery. From this one can calculate the cost per kWh of the energy (including the cost of charging).

Degradation

Over their lifespan batteries degrade gradually leading to reduced capacity due to the chemical and mechanical changes to the electrodes.[199] Batteries are multiphysics electrochemical systems and degrade through a variety of concurrent chemical, mechanical, electrical and thermal failure mechanisms. Some of the prominent mechanisms include solid electrolyte interphase layer (SEI) growth, lithium plating, mechanical cracking of SEI layer and electrode particles, and thermal decomposition of electrolyte.[199]

Degradation is strongly temperature-dependent, with a minimal degradation around 25 °C, i.e., increasing if stored or used at above or below 25 °C.[200] High charge levels and elevated temperatures (whether from charging or ambient air) hasten capacity loss.[201] Carbon anodes generate heat when in use. Batteries may be refrigerated to reduce temperature effects.[202]

Pouch and cylindrical cell temperatures depend linearly on the discharge current.[203] Poor internal ventilation may increase temperatures. Loss rates vary by temperature: 6% loss at 0 °C (32 °F), 20% at 25 °C (77 °F), and 35% at 40 °C (104 °F). In contrast, the calendar life of LiFePO
₄ cells is not affected by high charge states.[204][205]

The advent of the SEI layer improved performance, but increased vulnerability to thermal degradation. The layer is composed of electrolyte – carbonate reduction products that serve both as an ionic conductor and electronic insulator. It forms on both the anode and cathode and determines many performance parameters. Under typical conditions, such as room temperature and the absence of charge effects and contaminants, the layer reaches a fixed thickness after the first charge, allowing the device to operate for years. However, operation outside such parameters can degrade the device via several reactions.[206]

Lithium-ion batteries are prone to capacity fading over hundreds[207] to thousands of cycles. It is by slow electrochemical processes, the formation of a solid-electrolyte inter phase (SEI) in the negative electrode. SEI forms in between the first charge and discharge and results in the consumption of lithium ions. The consumption of lithium ions reduces the charge and discharge efficiency of the electrode material.[208] However, SEI film is organic solvent insoluble and hence it can be stable in organic electrolyte solutions. If proper additives are added to the electrolyte to promote SEI formation, the co-embedding of solvent molecules can be effectively prevented and the damage to electrode materials can be avoided. On the other hand, SEI is selective and allows lithium ions to pass through and forbids electrons to pass through. This guarantees the continuity of charging and discharging cycle.[209] SEI hinders the further consumption of lithium ions and thus greatly improves the electrode, as well as the cycle performance and service life. New data has shown that exposure to heat and the use of fast charging promote the degradation of Li-ion batteries more than age and actual use.[210] Charging Li-ion batteries beyond 80% can drastically accelerate battery degradation.[211][212][213][214][215]

Reactions

Five common exothermic degradation reactions can occur:[206]

• Chemical reduction of the electrolyte by the anode.
• Thermal decomposition of the electrolyte.
• Chemical oxidation of the electrolyte by the cathode.
• Thermal decomposition by the cathode and anode.
• Internal short circuit by charge effects.

Anode

The SEI layer that forms on the anode is a mixture of lithium oxide, lithium fluoride and semicarbonates (e.g., lithium alkyl carbonates).

At elevated temperatures, alkyl carbonates in the electrolyte decompose into insoluble Li
₂CO
₃ that increases film thickness, limiting anode efficiency. This increases cell impedance and reduces capacity.[200] Gases formed by electrolyte decomposition can increase the cell's internal pressure and are a potential safety issue in demanding environments such as mobile devices.[206]

Below 25 °C, plating of metallic Lithium on the anodes and subsequent reaction with the electrolyte is leading to loss of cyclable Lithium.[200]

Extended storage can trigger an incremental increase in film thickness and capacity loss.[206]

Charging at greater than 4.2 V can initiate Li⁺ plating on the anode, producing irreversible capacity loss. The randomness of the metallic lithium embedded in the anode during intercalation results in dendrites formation. Over time the dendrites can accumulate and pierce the separator, causing a short circuit leading to heat, fire or explosion. This process is referred to as thermal runaway.[206]

Discharging beyond 2 V can also result in capacity loss. The (copper) anode current collector can dissolve into the electrolyte. When charged, copper ions can reduce on the anode as metallic copper. Over time, copper dendrites can form and cause a short in the same manner as lithium.[206]

High cycling rates and state of charge induces mechanical strain on the anode's graphite lattice. Mechanical strain caused by intercalation and de-intercalation creates fissures and splits of the graphite particles, changing their orientation. This orientation change results in capacity loss.[206]

Electrolytes

Electrolyte degradation mechanisms include hydrolysis and thermal decomposition.[206]

At concentrations as low as 10 ppm, water begins catalyzing a host of degradation products that can affect the electrolyte, anode and cathode.[206] LiPF
₆ participates in an equilibrium reaction with LiF and PF
₅. Under typical conditions, the equilibrium lies far to the left. However the presence of water generates substantial LiF, an insoluble, electrically insulating product. LiF binds to the anode surface, increasing film thickness.[206]

LiPF
₆ hydrolysis yields PF
₅, a strong Lewis acid that reacts with electron-rich species, such as water. PF
₅ reacts with water to form hydrofluoric acid (HF) and phosphorus oxyfluoride. Phosphorus oxyfluoride in turn reacts to form additional HF and difluorohydroxy phosphoric acid. HF converts the rigid SEI film into a fragile one. On the cathode, the carbonate solvent can then diffuse onto the cathode oxide over time, releasing heat and thermal runaway.[206]

Decomposition of electrolyte salts and interactions between the salts and solvent start at as low as 70 C. Significant decomposition occurs at higher temperatures. At 85 C transesterification products, such as dimethyl-2,5-dioxahexane carboxylate (DMDOHC) are formed from EC reacting with DMC.[206]

Cathode

Cathode degradation mechanisms include manganese dissolution, electrolyte oxidation and structural disorder.[206]

In LiMnO
₄ hydrofluoric acid catalyzes the loss of metallic manganese through disproportionation of trivalent manganese:[206]

2Mn³⁺ → Mn²⁺+ Mn⁴⁺

Material loss of the spinel results in capacity fade. Temperatures as low as 50 °C initiate Mn²⁺ deposition on the anode as metallic manganese with the same effects as lithium and copper plating.[200] Cycling over the theoretical max and min voltage plateaus destroys the crystal lattice via Jahn-Teller distortion, which occurs when Mn⁴⁺ is reduced to Mn³⁺ during discharge.[206]

Storage of a battery charged to greater than 3.6 V initiates electrolyte oxidation by the cathode and induces SEI layer formation on the cathode. As with the anode, excessive SEI formation forms an insulator resulting in capacity fade and uneven current distribution.[206]

Storage at less than 2 V results in the slow degradation of LiCoO
₂ and LiMn
₂O
₄ cathodes, the release of oxygen and irreversible capacity loss.[206]

Conditioning

The need to "condition" NiCd and NiMH batteries has leaked into folklore surrounding Li-ion batteries, but is unfounded. The recommendation for the older technologies is to leave the device plugged in for seven or eight hours, even if fully charged.[216] This may be a confusion of battery software calibration instructions with the "conditioning" instructions for NiCd and NiMH batteries.[217]

Multicell devices

Li-ion batteries require a battery management system to prevent operation outside each cell's safe operating area (max-charge, min-charge, safe temperature range) and to balance cells to eliminate state of charge mismatches. This significantly improves battery efficiency and increases capacity. As the number of cells and load currents increase, the potential for mismatch increases. The two kinds of mismatch are state-of-charge (SOC) and capacity/energy ("C/E"). Though SOC is more common, each problem limits pack charge capacity (mA·h) to that of the weakest cell.

Safety

See also: Plug-in electric vehicle fire incidents and Boeing 787 Dreamliner battery problems

Fire hazard

Lithium-ion batteries can be a safety hazard since they contain a flammable electrolyte and may become pressurized if they become damaged. A battery cell charged too quickly could cause a short circuit, leading to explosions and fires.[218] Because of these risks, testing standards are more stringent than those for acid-electrolyte batteries, requiring both a broader range of test conditions and additional battery-specific tests, and there are shipping limitations imposed by safety regulators.[130][219][23] There have been battery-related recalls by some companies, including the 2016 Samsung Galaxy Note 7 recall for battery fires.[15][220]

Lithium-ion batteries, unlike rechargeable batteries with water-based electrolytes, have a potentially hazardous pressurised flammable liquid electrolyte, and require strict quality control during manufacture.[221] A faulty battery can cause a serious fire.[218] Faulty chargers can affect the safety of the battery because they can destroy the battery's protection circuit. While charging at temperatures below 0 °C, the negative electrode of the cells gets plated with pure lithium, which can compromise the safety of the whole pack.

Short-circuiting a battery will cause the cell to overheat and possibly to catch fire. Adjacent cells may then overheat and fail, possibly causing the entire battery to ignite or rupture. In the event of a fire, the device may emit dense irritating smoke.[222] The fire energy content (electrical + chemical) of cobalt-oxide cells is about 100 to 150 kJ/(A·h), most of it chemical.[129][223]

While fire is often serious, it may be catastrophically so. Around 2010, large lithium-ion batteries were introduced in place of other chemistries to power systems on some aircraft; as of January 2014, there had been at least four serious lithium-ion battery fires, or smoke, on the Boeing 787 passenger aircraft, introduced in 2011, which did not cause crashes but had the potential to do so.[224][225]

In addition, several aircraft crashes have been attributed to burning Li-Ion batteries. UPS Airlines Flight 6 crashed in Dubai after its payload of batteries spontaneously ignited, progressively destroying critical systems inside the aircraft which eventually rendered it uncontrollable.

Damaging and overloading

If a lithium-ion battery is damaged, crushed, or is subjected to a higher electrical load without having overcharge protection, then problems may arise. External short circuit can trigger the battery explosion.[226]

If overheated or overcharged, Li-ion batteries may suffer thermal runaway and cell rupture.[227][228] In extreme cases this can lead to leakage, explosion or fire. To reduce these risks, many lithium-ion cells (and battery packs) contain fail-safe circuitry that disconnects the battery when its voltage is outside the safe range of 3–4.2 V per cell.[114][192] or when overcharged or discharged. Lithium battery packs, whether constructed by a vendor or the end-user, without effective battery management circuits are susceptible to these issues. Poorly designed or implemented battery management circuits also may cause problems; it is difficult to be certain that any particular battery management circuitry is properly implemented.

Voltage limits

Lithium-ion cells are susceptible to stress by voltage ranges outside of safe ones between 2.5 and 3.65/4.1/4.2 or 4.35V (depending on the components of the cell). Exceeding this voltage range results in premature aging and in safety risks due to the reactive components in the cells.[229] When stored for long periods the small current draw of the protection circuitry may drain the battery below its shutoff voltage; normal chargers may then be useless since the battery management system (BMS) may retain a record of this battery (or charger) 'failure'. Many types of lithium-ion cells cannot be charged safely below 0 °C,[230] as this can result in plating of lithium on the anode of the cell, which may cause complications such as internal short-circuit paths.

Other safety features are required in each cell:[114]

• Shut-down separator (for overheating)
• Tear-away tab (for internal pressure relief)
• Vent (pressure relief in case of severe outgassing)
• Thermal interrupt (overcurrent/overcharging/environmental exposure)

These features are required because the negative electrode produces heat during use, while the positive electrode may produce oxygen. However, these additional devices occupy space inside the cells, add points of failure, and may irreversibly disable the cell when activated. Further, these features increase costs compared to nickel metal hydride batteries, which require only a hydrogen/oxygen recombination device and a back-up pressure valve.[192] Contaminants inside the cells can defeat these safety devices. Also, these features can not be applied to all kinds of cells, e.g. prismatic high current cells cannot be equipped with a vent or thermal interrupt. High current cells must not produce excessive heat or oxygen, lest there be a failure, possibly violent. Instead, they must be equipped with internal thermal fuses which act before the anode and cathode reach their thermal limits.

Replacing the lithium cobalt oxide positive electrode material in lithium-ion batteries with a lithium metal phosphate such as lithium iron phosphate (LFP) improves cycle counts, shelf life and safety, but lowers capacity. As of 2006, these 'safer' lithium-ion batteries were mainly used in electric cars and other large-capacity battery applications, where safety is critical.[231]

Recalls

• In October 2004, Kyocera Wireless recalled approximately 1 million mobile phone batteries to identify counterfeits.[232]
• In December 2005, Dell recalled approximately 22,000 laptop computer batteries, and 4.1 million in August 2006.[233]
• In 2006, approximately 10 million Sony batteries used in Dell, Sony, Apple, Lenovo, Panasonic, Toshiba, Hitachi, Fujitsu and Sharp laptops were recalled. The batteries were found to be susceptible to internal contamination by metal particles during manufacture. Under some circumstances, these particles could pierce the separator, causing a dangerous short-circuit.[234]
• In March 2007, computer manufacturer Lenovo recalled approximately 205,000 batteries at risk of explosion.
• In August 2007, mobile phone manufacturer Nokia recalled over 46 million batteries at risk of overheating and exploding.[235] One such incident occurred in the Philippines involving a Nokia N91, which used the BL-5C battery.[236]
• In September 2016, Samsung recalled approximately 2.5 million Galaxy Note 7 phones after 35 confirmed fires.[220] The recall was due to a manufacturing design fault in Samsung's batteries which caused internal positive and negative poles to touch.[237]

Transport restrictions

Japan Airlines Boeing 787 lithium cobalt oxide battery that caught fire in 2013

IATA estimates that over a billion lithium cells are flown each year.[223]

The maximum size of each battery (whether installed in a device or as spare batteries) that can be carried is one that has an equivalent lithium content (ELC) not exceeding 8 grams per battery. Except, that if only one or two batteries are carried, each may have an ELC of up to 25 g.[238] The ELC for any battery is found by multiplying the ampere-hour capacity of each cell by 0.3 and then multiplying the result by the number of cells in the battery.[238] The resultant calculated lithium content is not the actual lithium content but a theoretical figure solely for transportation purposes. When shipping lithium ion batteries however, if the total lithium content in the cell exceeds 1.5 g, the package must be marked as "Class 9 miscellaneous hazardous material".

Although devices containing lithium-ion batteries may be transported in checked baggage, spare batteries may be only transported in carry-on baggage.[238] They must be protected against short circuiting, and example tips are provided in the transport regulations on safe packaging and carriage; e.g., such batteries should be in their original protective packaging or, "by taping over the exposed terminals or placing each battery in a separate plastic bag or protective pouch".[238][239] These restrictions do not apply to a lithium-ion battery that is a part of a wheelchair or mobility aid (including any spare batteries) to which a separate set of rules and regulations apply.[238]

Some postal administrations restrict air shipping (including EMS) of lithium and lithium-ion batteries, either separately or installed in equipment. Such restrictions apply in Hong Kong,[240] Australia and Japan.[241] Other postal administrations, such as the United Kingdom's Royal Mail may permit limited carriage of batteries or cells that are operative but totally prohibit handling of known defective ones, which is likely to prove of significance to those discovering faulty such items bought through mail-order channels.[242] IATA provides details in its Lithium Battery Guidance document.

On 16 May 2012, the United States Postal Service (USPS) banned shipping anything containing a lithium battery to an overseas address, after fires from transport of batteries.[243] This restriction made it difficult to send anything containing lithium batteries to military personnel overseas, as the USPS was the only method of shipment to these addresses; the ban was lifted on 15 November 2012.[244] United Airlines and Delta Air Lines excluded lithium-ion batteries in 2015 after an FAA report on chain reactions.[245][246][247]

The Boeing 787 Dreamliner uses large lithium cobalt oxide[248] batteries, which are more reactive than newer types of batteries such as LiFePO
₄.[249][130]

Starting on 15 January 2018, several major U.S. airlines banned smart luggage with non-removable batteries from being checked in to travel in the cargo hold due to the risk of fire.[250] Some airlines continued to mistakenly prevent passengers from bringing smart luggage as a carry on after the ban went into effect.[251]

Several smart luggage companies have been forced to shut down as a result of the ban.[252]

Environmental impact and recycling

Since Li-ion batteries contain less toxic metals than other types of batteries which may contain lead or cadmium,[114] they are generally categorized as non-hazardous waste. Li-ion battery elements including iron, copper, nickel and cobalt are considered safe for incinerators and landfills. These metals can be recycled,[253][254] but mining generally remains cheaper than recycling.[255] In the past, not much was invested into recycling Li-ion batteries due to cost, complexity and low yield. Since 2018, the recycling yield was increased significantly, and the recovering of lithium, manganese, aluminum, the organic solvents of the electrolyte and graphite is possible at industrial scales.[256] The most expensive metal involved in the construction of the cell is cobalt, much of which is mined in Congo (see also Mining industry of the Democratic Republic of the Congo). Lithium iron phosphate is cheaper, but has other drawbacks. Lithium is less expensive than other metals used, but recycling could prevent a future shortage.[253]

The manufacturing processes of nickel and cobalt, and the solvent, present potential environmental and health hazards.[257][258] The extraction of lithium may have an impact on the environment due to water pollution. Lithium mining takes place in selected mines in North and South America, Asia, South Africa, Central Andes and China.[259]

Manufacturing a kg of Li-ion battery takes about 67 megajoule (MJ) of energy.[260][261] The global warming potential of lithium-ion batteries manufacturing strongly depends on the energy source used in mining and manufacturing operations. Various estimates range from 62[262] to 140 kg CO₂-equivalents per kWh.[263] Effective recycling can reduce the carbon footprint of the production significantly.[264]

Research

Main article: Research in lithium-ion batteries

Researchers are actively working to improve the power density, safety, cycle durability (battery life), recharge time, cost, flexibility, and other characteristics, as well as research methods and uses, of these batteries.

See also

• Aluminium-ion battery
• Comparison of commercial battery types
• Gigafactory 1
• Glass battery
• List of battery sizes – Wikipedia list article
• List of battery types
• List of energy densities
• Lithium as an investment
• Lithium battery
• Lithium-ion capacitor (LIC)
• Lithium ion manganese oxide battery
• Lithium iron phosphate battery – Type of Li-ion battery using LiFePO₄
• Lithium polymer battery
• Lithium–sulfur battery
• Lithium-titanate battery – Fast rechargeable lithium ion battery
• Lithium vanadium phosphate battery
• Lithium-ion flow battery
• Lithium–air battery
• Lithium–silicon battery
• Nanotechnology – Field of applied science whose theme is the control of matter on atomic and (supra)molecular scale
• Nanowire battery
• Plug-in electric vehicle fire incidents
• Solid-state battery
• Thin film lithium-ion battery
• Sodium-ion battery
• Potassium-ion battery

References

1. "Rechargeable Li-Ion OEM Battery Products". Panasonic.com. Archived from the original on 13 April 2010. Retrieved 23 April 2010.
2. "Panasonic Develops New Higher-Capacity 18650 Li-Ion Cells; Application of Silicon-based Alloy in Anode". greencarcongress.com. Retrieved 31 January 2011.
3. "NCR18650B" (PDF). Panasonic. Archived from the original (PDF) on 17 August 2018. Retrieved 7 October 2016.
4. "NCR18650GA" (PDF). Retrieved 2 July 2017.
5. Valøen, Lars Ole and Shoesmith, Mark I. (2007). The effect of PHEV and HEV duty cycles on battery and battery pack performance (PDF). 2007 Plug-in Highway Electric Vehicle Conference: Proceedings. Retrieved 11 June 2010.
6. "Battery Pack Prices Fall As Market Ramps Up With Market Average At $156/kWh In 2019". Bloomberg New Energy Finance. 3 December 2019. Retrieved 17 December 2019.
7. Redondo-Iglesias, Eduardo; Venet, Pascal; Pelissier, Serge (2016). "Measuring Reversible and Irreversible Capacity Losses on Lithium-Ion Batteries". 2016 IEEE Vehicle Power and Propulsion Conference (VPPC). p. 7. doi:10.1109/VPPC.2016.7791723. ISBN 978-1-5090-3528-1.
8. Battery Types and Characteristics for HEV Archived 20 May 2015 at the Wayback Machine ThermoAnalytics, Inc., 2007. Retrieved 11 June 2010.
9. Ballon, Massie Santos (14 October 2008). "Electrovaya, Tata Motors to make electric Indica". cleantech.com. Archived from the original on 9 May 2011. Retrieved 11 June 2010.
10. "IEEE Medal for Environmental and Safety Technologies Recipients". IEEE Medal for Environmental and Safety Technologies. Institute of Electrical and Electronics Engineers. Retrieved 29 July 2019.
11. "The Nobel Prize in Chemistry 2019". Nobel Prize. Nobel Foundation. 2019. Retrieved 1 January 2020.
12. "NIMS Award Goes to Koichi Mizushima and Akira Yoshino". National Institute for Materials Science. 14 September 2016. Retrieved 9 April 2020.
13. "Yoshio Nishi". National Academy of Engineering. Retrieved 12 October 2019.
14. "Memory effect now also found in lithium-ion batteries". Retrieved 5 August 2015.
15. Kwon, Jethro Mullen and K. J. (2 September 2016). "Samsung is recalling the Galaxy Note 7 worldwide over battery problem". CNNMoney. Retrieved 13 September 2019.
16. Mauger, A; Julien, C.M. (28 June 2017). "Critical review on lithium-ion batteries: are they safe? Sustainable?" (PDF). Ionics. 23 (8): 1933–1947. doi:10.1007/s11581-017-2177-8.
17. Mark Ellis, Sandy Munro (4 June 2020). Sandy Munro on Tesla's Battery Tech Domination (video). E for Electric. Event occurs at 3:53–5:50. Retrieved 29 June 2020 – via YouTube.
18. Eftekhari, Ali (2017). "Lithium-Ion Batteries with High Rate Capabilities". ACS Sustainable Chemistry & Engineering. 5 (3): 2799–2816. doi:10.1021/acssuschemeng.7b00046.
19. Hopkins, Gina (16 November 2017). "Watch: Cuts and dunks don't stop new lithium-ion battery - Futurity". Futurity. Retrieved 10 July 2018.
20. Chawla, N.; Bharti, N.; Singh, S. (2019). "Recent Advances in Non-Flammable Electrolytes for Safer Lithium-Ion Batteries". Batteries. 5: 19. doi:10.3390/batteries5010019.
21. Yao, X.L.; Xie, S.; Chen, C.; Wang, Q.S.; Sun, J.; Wang, Q.S.; Sun, J. (2004). "Comparative study of trimethyl phosphite and trimethyl phosphate as electrolyte additives in lithium ion batteries". Journal of Power Sources. 144: 170–175. doi:10.1016/j.jpowsour.2004.11.042.
22. Fergus, J.W. (2010). "Ceramic and polymeric solid electrolytes for lithium-ion batteries". Journal of Power Sources. 195 (15): 4554–4569. Bibcode:2010JPS...195.4554F. doi:10.1016/j.jpowsour.2010.01.076.
23. IEC 62133. Secondary cells and batteries containing alkaline or other non-acid electrolytes – Safety requirements for portable sealed secondary cells, and for batteries made from them, for use in portable applications (2.0 ed.). International Electrotechnical Commission. December 2012. ISBN 978-2-83220-505-1.
24. IEC 61960. Secondary cells and batteries containing alkaline or other non-acid electrolytes – Secondary lithium cells and batteries for portable applications (2.0 ed.). International Electrotechnical Commission. June 2011. ISBN 978-2-88912-538-8.
25. ISO 12405-1:2011. Electrically propelled road vehicles — Test specification for lithium-ion traction battery packs and systems. Part 1: High-power applications. International Organization for Standardization. 2011. ISBN 978-0-580-62648-7.
26. Doughty, Daniel H.; Crafts, Chris C. (August 2006). SAND 2005–3123. FreedomCAR Electrical Energy Storage System Abuse Test Manual for Electric and Hybrid Electric Vehicle Applications. Sandia National Laboratories.
27. Whittingham, M. S. (1976). "Electrical Energy Storage and Intercalation Chemistry". Science. 192 (4244): 1126–1127. Bibcode:1976Sci...192.1126W. doi:10.1126/science.192.4244.1126. PMID 17748676.
28. Fletcher, Seth (2011). Bottled Lightning: Superbatteries, Electric Cars, and the New Lithium Economy. Macmillan.
29. "XXIV.—On chemical analysis by spectrum-observations". Quarterly Journal of the Chemical Society of London. 13 (3): 270. 1861. doi:10.1039/QJ8611300270.
30. Besenhard, J.O. & Fritz, H.P. (1974). "Cathodic Reduction of Graphite in Organic Solutions of Alkali and NR₄⁺ Salts". J. Electroanal. Chem. 53 (2): 329–333. doi:10.1016/S0022-0728(74)80146-4.
31. Besenhard, J. O. (1976). "The electrochemical preparation and properties of ionic alkali metal-and NR₄-graphite intercalation compounds in organic electrolytes". Carbon. 14 (2): 111–115. doi:10.1016/0008-6223(76)90119-6.
32. Schöllhorn, R.; Kuhlmann, R.; Besenhard, J. O. (1976). "Topotactic redox reactions and ion exchange of layered MoO₃ bronzes". Materials Research Bulletin. 11: 83–90. doi:10.1016/0025-5408(76)90218-X.
33. Besenhard, J. O.; Schöllhorn, R. (1976). "The discharge reaction mechanism of the MoO₃ electrode in organic electrolytes". Journal of Power Sources. 1 (3): 267–276. Bibcode:1976JPS.....1..267B. doi:10.1016/0378-7753(76)81004-X.
34. Besenhard, J. O.; Eichinger, G. (1976). "High energy density lithium cells". Journal of Electroanalytical Chemistry and Interfacial Electrochemistry. 68: 1–18. doi:10.1016/S0022-0728(76)80298-7.
35. Eichinger, G.; Besenhard, J. O. (1976). "High energy density lithium cells". Journal of Electroanalytical Chemistry and Interfacial Electrochemistry. 72: 1–31. doi:10.1016/S0022-0728(76)80072-1.
36. Heller, Adam (25 November 1975). "Electrochemical Cell". United States Patent. Retrieved 18 November 2013.
37. Zanini, M.; Basu, S.; Fischer, J. E. (1978). "Alternate synthesis and reflectivity spectrum of stage 1 lithium—graphite intercalation compound". Carbon. 16 (3): 211–212. doi:10.1016/0008-6223(78)90026-X.
38. Basu, S.; Zeller, C.; Flanders, P. J.; Fuerst, C. D.; Johnson, W. D.; Fischer, J. E. (1979). "Synthesis and properties of lithium-graphite intercalation compounds". Materials Science and Engineering. 38 (3): 275–283. doi:10.1016/0025-5416(79)90132-0.
39. US 4304825, Basu; Samar, "Rechargeable battery", issued 8 December 1981, assigned to Bell Telephone Laboratories
40. Godshall, N.A.; Raistrick, I.D.; Huggins, R.A. (1980). "Thermodynamic investigations of ternary lithium-transition metal-oxygen cathode materials". Materials Research Bulletin. 15 (5): 561. doi:10.1016/0025-5408(80)90135-X.
41. Godshall, Ned A. (17 October 1979) "Electrochemical and Thermodynamic Investigation of Ternary Lithium -Transition Metal-Oxide Cathode Materials for Lithium Batteries: Li₂MnO₄ spinel, LiCoO₂, and LiFeO₂", Presentation at 156th Meeting of the Electrochemical Society, Los Angeles, CA.
42. Godshall, Ned A. (18 May 1980) Electrochemical and Thermodynamic Investigation of Ternary Lithium-Transition Metal-Oxygen Cathode Materials for Lithium Batteries. Ph.D. Dissertation, Stanford University
43. "USPTO search for inventions by "Goodenough, John"". Patft.uspto.gov. Retrieved 8 October 2011.
44. Mizushima, K.; Jones, P. C.; Wiseman, P. J.; Goodenough, J. B. (1980). "Li
    _xCoO
    ₂(0<x<-1): A new cathode material for batteries of high energy density". Materials Research Bulletin. 15 (6): 783–789. doi:10.1016/0025-5408(80)90012-4.
45. Poizot, P.; Laruelle, S.; Grugeon, S.; Tarascon, J. (2000). "Nano-sized transition-metal oxides as negative-electrode materials for lithium-ion batteries". Nature. 407 (6803): 496–499. Bibcode:2000Natur.407..496P. doi:10.1038/35035045. PMID 11028997.
46. Godshall, N (1986). "Lithium transport in ternary lithium-copper-oxygen cathode materials". Solid State Ionics. 18–19: 788–793. doi:10.1016/0167-2738(86)90263-8.
47. International Meeting on Lithium Batteries, Rome, 27–29 April 1982, C.L.U.P. Ed. Milan, Abstract #23
48. Yazami, R.; Touzain, P. (1983). "A reversible graphite-lithium negative electrode for electrochemical generators". Journal of Power Sources. 9 (3): 365–371. Bibcode:1983JPS.....9..365Y. doi:10.1016/0378-7753(83)87040-2.
49. "Rachid Yazami". National Academy of Engineering. Retrieved 12 October 2019.
50. Yamabe, T. (2015). "Lichiumu Ion Niji Denchi: Kenkyu Kaihatu No Genryu Wo Kataru" [Lithium Ion Rechargeable Batteries: Tracing the Origins of Research and Development: Focus on the History of Negative-Electrode Material Development]. The Journal Kagaku (in Japanese). 70 (12): 40–46. Archived from the original on 8 August 2016. Retrieved 15 June 2016.
51. Novák, P.; Muller, K.; Santhanam, K. S. V.; Haas, O. (1997). "Electrochemically Active Polymers for Rechargeable Batteries". Chem. Rev. 97 (1): 271–272. doi:10.1021/cr941181o. PMID 11848869.
52. Yamabe, T.; Tanaka, K.; Ohzeki, K.; Yata, S. (1982). "Electronic Structure of Polyacenacene. A One-Dimensional Graphite". Solid State Communications. 44 (6): 823. Bibcode:1982SSCom..44..823Y. doi:10.1016/0038-1098(82)90282-4.
53. US 4601849, Yata, S., "Electrically conductive organic polymeric material and process for production thereof"
54. Nigrey, Paul J (1981). "Lightweight Rechargeable Storage Batteries Using Polyacetylene (CH)_x as the Cathode-Active Material". Journal of the Electrochemical Society. 128 (8): 1651. doi:10.1149/1.2127704.
55. Godshall, N. A.; Raistrick, I. D. and Huggins, R. A. U.S. Patent 4,340,652 "Ternary Compound Electrode for Lithium Cells"; issued 20 July 1982, filed by Stanford University on 30 July 1980.
56. Thackeray, M. M.; David, W. I. F.; Bruce, P. G.; Goodenough, J. B. (1983). "Lithium insertion into manganese spinels". Materials Research Bulletin. 18 (4): 461–472. doi:10.1016/0025-5408(83)90138-1.
57. US 4668595, Yoshino; Akira, "Secondary Battery", issued 10 May 1985, assigned to Asahi Kasei
58. Manthiram, A.; Goodenough, J. B. (1989). "Lithium insertion into Fe₂(SO₄)₃ frameworks". Journal of Power Sources. 26 (3–4): 403–408. Bibcode:1989JPS....26..403M. doi:10.1016/0378-7753(89)80153-3.
59. Manthiram, A.; Goodenough, J. B. (1987). "Lithium insertion into Fe₂(MO₄)₃ frameworks: Comparison of M = W with M = Mo". Journal of Solid State Chemistry. 71 (2): 349–360. doi:10.1016/0022-4596(87)90242-8.
60. Masquelier, Christian; Croguennec, Laurence (2013). "Polyanionic (Phosphates, Silicates, Sulfates) Frameworks as Electrode Materials for Rechargeable Li (or Na) Batteries". Chemical Reviews. 113 (8): 6552–6591. doi:10.1021/cr3001862.
61. "Keywords to understanding Sony Energy Devices – keyword 1991". Archived from the original on 4 March 2016.
62. Padhi, A.K., Naujundaswamy, K.S., Goodenough, J. B. (1996) "{{Phospho-olivines as positive elected materials for rechargeable lithium batteries". Journal of the Electrochemical Society, 144 (4), p. 1188-1194
63. Padhi, A.K., Naujundaswamy, K.S., Goodenough, J. B. (1996) "LiFePO
    ₄: a novel cathode material for rechargeable batteries". Electrochimical Society Meeting Abstracts, 96-1, p. 73
64. C. S. Johnson, J. T. Vaughey, M. M. Thackeray, T. E. Bofinger, and S. A. Hackney "Layered Lithium-Manganese Oxide Electrodes Derived from Rock-Salt LixMnyOz (x+y=z) Precursors" 194th Meeting of the Electrochemical Society, Boston, MA, Nov.1-6, (1998)
65. Chebiam, R. V.; Kannan, A. M.; Prado, F.; Manthiram, A. (2001). "Comparison of the chemical stability of the high energy density cathodes of lithium-ion batteries". Electrochemistry Communications. 3: 624–627. doi:10.1016/S1388-2481(01)00232-6.
66. Chebiam, R. V.; Prado, F.; Manthiram, A. (2001). "Soft Chemistry Synthesis and Characterization of Layered Li_1-xNi_1-yCo_yO_2-δ (0 ≤ x ≤ 1 and 0 ≤ y ≤ 1)". Chemistry of Materials. 13: 2951–2957. doi:10.1021/cm0102537.
67. Manthiram, Arumugam (2020). "A reflection on lithium-ion battery cathode chemistry". Nature Communications. 11. doi:10.1038/s41467-020-15355-0.
68. US US6677082, Thackeray, M; Amine, K. & Kim, J. S., "Lithium metal oxide electrodes for lithium cells and batteries"
69. US US6680143, Thackeray, M; Amine, K. & Kim, J. S., "Lithium metal oxide electrodes for lithium cells and batteries"
70. US US6964828 B2, Lu, Zhonghua, "Cathode compositions for lithium-ion batteries"
71. Chung, S. Y.; Bloking, J. T.; Chiang, Y. M. (2002). "Electronically conductive phospho-olivines as lithium storage electrodes". Nature Materials. 1 (2): 123–128. Bibcode:2002NatMa...1..123C. doi:10.1038/nmat732. PMID 12618828.
72. "In search of the perfect battery" (PDF). The Economist. 6 March 2008. Archived from the original (PDF) on 27 July 2011. Retrieved 11 May 2010.
73. Song, Y; Zavalij, PY; Whittingham, MS (2005). "ε-VOPO4: electrochemical synthesis and enhanced cathode behavior". Journal of the Electrochemical Society. 152 (4): A721–A728. doi:10.1149/1.1862265.
74. Lim, SC; Vaughey, JT; Harrison, WTA; Dussack, LL; Jacobson, AJ; Johnson, JW (1996). "Redox transformations of simple vanadium phosphates: the synthesis of ϵ-VOPO4". Solid State Ionics. 84 (3–4): 219–226. doi:10.1016/0167-2738(96)00007-0.
75. . BASF breaks ground for lithium-ion battery materials plant in Ohio, October 2009.
76. Monthly battery sales statistics. Machinery statistics released by the Ministry of Economy, Trade and Industry, March 2011.
77. "Lithium Ion Battery Pioneers Receive Draper Prize, Engineering’s Top Honor" Archived 3 April 2015 at the Wayback Machine, University of Texas, 6 January 2014
78. "At long last, new lithium battery tech actually arrives on the market (and might already be in your smartphone)". ExtremeTech. Retrieved 16 February 2014.
79. Qi, Zhaoxiang; Koenig, Gary M. (16 August 2016). "High-Performance LiCoO₂Sub-Micrometer Materials from Scalable Microparticle Template Processing". ChemistrySelect. 1 (13): 3992–3999. doi:10.1002/slct.201600872.
80. "Switching From Lithium-Ion Could Be Harder Than You Think". 19 October 2017. Retrieved 20 October 2017.
81. Fisher, Thomas. "Will Tesla Alone Double Global Demand For Its Battery Cells? (Page 2)". Greencarreports.com. Archived from the original on 18 October 2017. Retrieved 16 February 2014.
82. "Reduced cell cost suggests the upcoming era of large capacity cells". EnergyTrend. 6 May 2013. Retrieved 16 February 2014.
83. Ramsey, Mike (22 June 2015). "24M Technologies Launches Cheaper-to-Produce Lithium-Ion Cell". Retrieved 15 December 2015.
84. "Chevy Bolt EV: LG gearing up to 'mass-produce parts' for the car this month". 8 August 2016. Retrieved 2 August 2017.
85. Lai, Chun Sing; Jia, Youwei; Lai, Loi Lei; Xu, Zhao; McCulloch, Malcolm D.; Wong, Kit Po (October 2017). "A comprehensive review on large-scale photovoltaic system with applications of electrical energy storage". Renewable and Sustainable Energy Reviews. 78: 439–451. doi:10.1016/j.rser.2017.04.078.
86. Wentker, Marc; Greenwood, Matthew; Leker, Jens (5 February 2019). "A Bottom-Up Approach to Lithium-Ion Battery Cost Modeling with a Focus on Cathode Active Materials". Energies. 12 (3): 504. doi:10.3390/en12030504.
87. "Volkswagen has reportedly reached a big milestone in battery costs that would heat up its competition with Tesla". 10 September 2019. Retrieved 29 September 2019.
88. Lai, Chun Sing; Locatelli, Giorgio; Pimm, Andrew; Tao, Yingshan; Li, Xuecong; Lai, Loi Lei (October 2019). "A financial model for lithium-ion storage in a photovoltaic and biogas energy system". Applied Energy. 251: 113179. doi:10.1016/j.apenergy.2019.04.175.
89. Deign, Jason (17 October 2019). "How the Battery Sector Is Looking to Improve Lithium-Ion". www.greentechmedia.com. 811 is rapidly gaining ground on two other slightly less low-cobalt variants, NMC 532 and 622
90. "What do we know about next-generation NMC 811 cathode?". Research Interfaces. 27 February 2018. Industry has been improving NMC technology by steadily increasing the nickel content in each cathode generation (e.g. NMC 433, NMC 532, or the most recent NMC 622)
91. "State of Charge: EVs, Batteries and Battery Materials (Free Report from @AdamasIntel)". Adamas Intelligence. 20 September 2019.
92. Silberberg, M. (2006). Chemistry: The Molecular Nature of Matter and Change, 4th Ed. New York (NY): McGraw-Hill Education. p. 935, ISBN 0077216504.
93. Thackeray, M. M.; Thomas, J. O.; Whittingham, M. S. (2011). "Science and Applications of Mixed Conductors for Lithium Batteries". MRS Bulletin. 25 (3): 39–46. doi:10.1557/mrs2000.17.
94. Shehzad, Khurram; Xu, Yang; Gao, Chao; Xianfeng, Duan (2016). "Three-dimensional macro-structures of two-dimensional nanomaterials". Chemical Society Reviews. 45 (20): 5541–5588. doi:10.1039/C6CS00218H. PMID 27459895.
95. MSDS: National Power Corp Lithium Ion Batteries Archived 26 June 2011 at the Wayback Machine (PDF). tek.com; Tektronix Inc., 7 May 2004. Retrieved 11 June 2010.
96. Joyce, C.; Trahy, L.; Bauer, S.; Dogan, F.; Vaughey, J. (2012). "Metallic Copper Binders for Lithium-Ion Battery Silicon Electrodes". Journal of the Electrochemical Society. 159 (6): 909–914. doi:10.1149/2.107206jes.
97. Goodwins, Rupert (17 August 2006). "Inside a notebook battery pack". ZDNet. Retrieved 6 June 2013.
98. Andrea 2010, p. 2.
99. "How is a Lithium Ion Pouch Cell Manufactured in the Lab?". KIT Zentrum für Mediales Lernen. 6 June 2018. Creative Commons Attribution license
100. Andrea 2010, p. 234.
101. "Prismatic cell winder". University of Michigan. 25 June 2015.
102. Wang, Y.; He, P.; Zhou, H. (2012). "Li-Redox Flow Batteries Based on Hybrid Electrolytes: At the Cross Road between Li-ion and Redox Flow Batteries". Advanced Energy Materials. 2 (7): 770–779. doi:10.1002/aenm.201200100.
103. Qi, Zhaoxiang; Koenig, Gary M. (15 August 2016). "A carbon-free lithium-ion solid dispersion redox couple with low viscosity for redox flow batteries". Journal of Power Sources. 323: 97–106. Bibcode:2016JPS...323...97Q. doi:10.1016/j.jpowsour.2016.05.033.
104. Panasonic unveils 'smallest' pin-shaped lithium ion battery, Telecompaper, 6 October 2014
105. Erol, Salim (5 January 2015). "Electrochemical Impedance Spectroscopy Analysis and Modeling of Lithium Cobalt Oxide/Carbon Batteries". Retrieved 10 September 2018. Cite journal requires |journal= (help)
106. "Rechargeable Li-Ion Button Battery: Serial LIR2032" (PDF). AA Portable Power Corp.
107. Guyomard, Dominique; Tarascon, Jean-Marie (1994). "Rocking-chair or lithium-ion rechargeable lithium batteries". Advanced Materials. 6 (5): 408–412. doi:10.1002/adma.19940060516. ISSN 1521-4095.
108. Megahed, Sid; Scrosati, Bruno (1994). "Lithium-ion rechargeable batteries". Journal of Power Sources. 51 (1–2): 79–104. Bibcode:1994JPS....51...79M. doi:10.1016/0378-7753(94)01956-8.
109. Brain, Marshall (14 November 2006). "How Lithium-ion Batteries Work". HowStuffWorks. Retrieved 20 March 2017.
110. Bergveld, H. J.; Kruijt, W. S.; Notten, P. H. L. (2002). Battery Management Systems: Design by Modelling. Springer. pp. 107–108, 113. ISBN 978-94-017-0843-2.
111. Dhameja, S (2001). Electric Vehicle Battery Systems. Newnes Press. p. 12. ISBN 978-075-06991-67.
112. Choi, H. C.; Jung, Y. M.; Noda, I.; Kim, S. B. (2003). "A Study of the Mechanism of the Electrochemical Reaction of Lithium with CoO by Two-Dimensional Soft X-ray Absorption Spectroscopy (2D XAS), 2D Raman, and 2D Heterospectral XAS−Raman Correlation Analysis". The Journal of Physical Chemistry B. 107 (24): 5806–5811. doi:10.1021/jp030438w.
113. Amatucci, G. G. (1996). "CoO
     ₂, the End Member of the Li
     _xCoO
     ₂ Solid Solution". Journal of the Electrochemical Society. 143 (3): 1114–1123. doi:10.1149/1.1836594.
114. "Lithium Ion technical handbook" (PDF). Gold Peak Industries Ltd. November 2003. Archived from the original (PDF) on 7 October 2007. Cite journal requires |journal= (help)
115. Younesi, Reza; Veith, Gabriel M.; Johansson, Patrik; Edström, Kristina; Vegge, Tejs (2015). "Lithium salts for advanced lithium batteries: Li–metal, Li–O₂, and Li–S". Energy Environ. Sci. 8 (7): 1905–1922. doi:10.1039/c5ee01215e.
116. Wenige, Niemann, et al. (30 May 1998). Liquid Electrolyte Systems for Advanced Lithium Batteries (PDF). cheric.org; Chemical Engineering Research Information Center(KR). Retrieved 11 June 2010.
117. Balbuena, P. B., Wang, Y. X. (eds) (2004). Lithium Ion Batteries: Solid Electrolyte Interphase, Imperial College Press, London. ISBN 1860943624.
118. Fong, R. A. (1990). "Studies of Lithium Intercalation into Carbons Using Nonaqueous Electrochemical Cells". Journal of the Electrochemical Society. 137 (7): 2009–2010. doi:10.1149/1.2086855.
119. Syzdek, J. A.; Borkowska, R.; Perzyna, K.; Tarascon, J. M.; Wieczorek, W. A. A. (2007). "Novel composite polymeric electrolytes with surface-modified inorganic fillers". Journal of Power Sources. 173 (2): 712–720. Bibcode:2007JPS...173..712S. doi:10.1016/j.jpowsour.2007.05.061.
120. Syzdek, J. A.; Armand, M.; Marcinek, M.; Zalewska, A.; Żukowska, G. Y.; Wieczorek, W. A. A. (2010). "Detailed studies on the fillers modification and their influence on composite, poly(oxyethylene)-based polymeric electrolytes". Electrochimica Acta. 55 (4): 1314–1322. doi:10.1016/j.electacta.2009.04.025.
121. Reiter, J.; Nádherná, M.; Dominko, R. (2012). "Graphite and LiCo_1/3Mn_1/3Ni_1/3O₂ electrodes with piperidinium ionic liquid and lithium bis(fluorosulfonyl)imide for Li-ion batteries". Journal of Power Sources. 205: 402–407. doi:10.1016/j.jpowsour.2012.01.003.
122. Can, Cao; Zhuo-Bin, Li; Xiao-Liang, Wang (2014). "Recent Advances in Inorganic Solid Electrolytes for Lithium Batteries". Frontiers in Energy Research. 2: 1–10. doi:10.3389/fenrg.2014.00025.
123. Zogg, Cornelia (14 June 2017). "A solid-state electrolyte that is able to compete with liquid electrolytes for rechargeable batteries". Phys.org. Retrieved 24 February 2018.
124. Can, Cao; Zhuo-Bin, Li; Xiao-Liang, Wang (2014). "Recent Advances in Inorganic Solid Electrolytes for Lithium Batteries". Frontiers in Energy Research. 2: 2–4. doi:10.3389/fenrg.2014.00025.
125. Can, Cao; Zhuo-Bin, Li; Xiao-Liang, Wang (2014). "Recent Advances in Inorganic Solid Electrolytes for Lithium Batteries". Frontiers in Energy Research. 2: 6–8. doi:10.3389/fenrg.2014.00025.
126. Tatsumisago, Masahiro; Nagao, Motohiro; Hayashi, Akitoshi (2013). "Recent development of sulfide solid electrolytes and interfacial modification for all-solid-state rechargeable lithium batteries". Journal of Asian Ceramic Societies. 1 (1): 17. doi:10.1016/j.jascer.2013.03.005.
127. Linden, David and Reddy, Thomas B. (eds.) (2002). Handbook of Batteries 3rd Edition. McGraw-Hill, New York. chapter 35. ISBN 0-07-135978-8.
128. Zhai, C; et al. (2016). "Interfacial electro-mechanical behaviour at rough surfaces". Extreme Mechanics Letters. 9: 422–429. doi:10.1016/j.eml.2016.03.021.
129. "How to rebuild a Li-Ion battery pack" (PDF). Electronics Lab. 24 March 2016. Archived from the original on 3 January 2012. Retrieved 29 October 2016.CS1 maint: BOT: original-url status unknown (link)
130. Schweber, Bill (4 August 2015). "Lithium Batteries: The Pros and Cons". GlobalSpec. GlobalSpec. Retrieved 15 March 2017.
131. "Design Review For: Advanced Electric Vehicle Battery Charger, ECE 445 Senior Design Project". 090521 courses.ece.illinois.edu. Archived from the original on 4 May 2013.
132. "Lithium Ion Rechargeable Batteries. Technical Handbook" (PDF). Archived from the original (PDF) on 11 April 2009.
133. "Custom Lithium ion Battery Pack Manufacturer". LargePower. Retrieved 16 March 2015.
134. Siemens CL75 user manual. Siemens AG. 2005. p. 8.
135. "Overview of lithium ion batteries" (PDF). Panasonic. January 2007. Archived (PDF) from the original on 7 November 2011.
136. Quinn, Jason B.; Waldmann, Thomas; Richter, Karsten; Kasper, Michael; Wohlfahrt-Mehrens, Margret (19 October 2018). "Energy Density of Cylindrical Li-Ion Cells: A Comparison of Commercial 18650 to the 21700 Cells". Journal of the Electrochemical Society. 165 (14): A3284–A3291. doi:10.1149/2.0281814jes. Larger cells take longer to dissipate heat, due to the lower surface to volume ratio (∼88% for 21700 compared to 18650 cells)
137. Winter & Brodd 2004, p. 4258
138. Andrea 2010, p. 12.
139. Turpen, Aaron (16 November 2015). "New battery tech gives 10 hours of talk time after only 5 minutes on charge". www.gizmag.com. Retrieved 3 December 2015.
140. Smith, Noah (16 January 2015). "Get Ready For Life Without Oil". bloombergview.com. Retrieved 31 July 2015.
141. Randall, Tom; Lippert, John (24 November 2017). "Tesla's Newest Promises Break the Laws of Batteries". Bloomberg.com. Retrieved 13 February 2018.
142. "Lithium-Ion Batteries". Sigma Aldrich. Sigma Aldrich.
143. Nitta, Naoki; Wu, Feixiang; Lee, Jung Tae; Yushin, Gleb (2015). "Li-ion battery materials: present and future". Materials Today. 18 (5): 252–264. doi:10.1016/j.mattod.2014.10.040.
144. Fergus, Jeffrey (2010). "Recent developments in cathode materials for lithium ion batteries". Journal of Power Sources. 195 (4): 939–954. Bibcode:2010JPS...195..939F. doi:10.1016/j.jpowsour.2009.08.089.
145. The Sony Lithium Ion Iron Phosphate (LFP) advantage Sony’s Energy Storage System
146. Eftekhari, Ali (2017). "LiFePO₄/C Nanocomposites for Lithium-Ion Batteries". Journal of Power Sources. 343: 395–411. Bibcode:2017JPS...343..395E. doi:10.1016/j.jpowsour.2017.01.080.
147. "Imara Corporation website". Imaracorp.com. Archived from the original on 22 July 2009. Retrieved 8 October 2011.
148. O'Dell, John (17 December 2008). Fledgling Battery Company Says Its Technology Boosts Hybrid Battery Performance Green Car Advisor; Edmunds Inc. Retrieved 11 June 2010.
149. LeVine, Steve (27 August 2015). "Tesla's coattails are carrying along Panasonic, but a battle for battery supremacy is brewing". Quartz. Retrieved 19 June 2017.
150. Peplow, Mark (13 December 2019). "Northvolt is building a future for greener batteries". Chemical & Engineering News. 97 (48).
151. Blomgren, George E. (2016). "The Development and Future of Lithium Ion Batteries". Journal of the Electrochemical Society. 164: A5019–A5025. doi:10.1149/2.0251701jes.
152. "Samsung INR18650-30Q datasheet" (PDF).
153. Jost, Kevin [ed.] (October 2006). Tech Briefs: CPI takes new direction on Li-ion batteries (PDF). aeionline.org; Automotive Engineering Online.
154. Voelcker, John (September 2007). Lithium Batteries Take to the Road Archived 27 May 2009 at the Wayback Machine. IEEE Spectrum. Retrieved 15 June 2010.
155. Loveday, Eric (23 April 2010). "Hitachi develops new manganese cathode, could double life of li-ion batteries". Retrieved 11 June 2010.
156. Nikkei (29 November 2009). Report: Nissan On Track with Nickel Manganese Cobalt Li-ion Cell for Deployment in 2015 Green Car Congress (blog). Retrieved 11 June 2010.
157. EnerDel Technical Presentation (PDF). EnerDel Corporation. 29 October 2007..
158. Elder, Robert and Zehr, Dan (16 February 2006). Valence sued over UT patent Austin American-Statesman (courtesy Bickle & Brewer Law Firm)..
159. Bulkeley, William M. (26 November 2005). "New Type of Battery Offers Voltage Aplenty, at a Premium". The Day. p. E6.
160. A123Systems (2 November 2005). A123Systems Launches New Higher-Power, Faster Recharging Li-Ion Battery Systems Green Car Congress; A123Systems (Press release). Retrieved 11 May 2010.
161. Hayner, CM; Zhao, X; Kung, HH (1 January 2012). "Materials for Rechargeable Lithium-Ion Batteries". Annual Review of Chemical and Biomolecular Engineering. 3 (1): 445–471. doi:10.1146/annurev-chembioeng-062011-081024. PMID 22524506.
162. Eftekhari, Ali (2017). "Low Voltage Anode Materials for Lithium-Ion Batteries". Energy Storage Materials. 7: 157–180. doi:10.1016/j.ensm.2017.01.009.
163. "Northwestern researchers advance Li-ion batteries with graphene-silicon sandwich | Solid State Technology". Electroiq.com. November 2011. Archived from the original on 15 March 2018. Retrieved 3 January 2019.
     Zhao, X.; Hayner, C. M.; Kung, M. C.; Kung, H. H. (2011). "In-Plane Vacancy-Enabled High-Power Si-Graphene Composite Electrode for Lithium-Ion Batteries". Advanced Energy Materials. 1 (6): 1079–1084. doi:10.1002/aenm.201100426.
164. "... Acceptance of the First Grid-Scale, Battery Energy Storage System" (Press release). Altair Nanotechnologies. 21 November 2008. Retrieved 8 October 2009.
165. Ozols, Marty (11 November 2009). Altair Nanotechnologies Power Partner – The Military. Systemagicmotives (personal webpage). Retrieved 11 June 2010.
166. Gotcher, Alan J. (29 November 2006). "Altair EDTA Presentation" (PDF). Altairnano.com. Archived from the original (PDF) on 16 June 2007.
167. Synthetic Carbon Negative electrode Boosts Battery Capacity 30 Percent | MIT Technology Review. Technologyreview.com (2 April 2013). Retrieved 16 April 2013.
168. Newman, Jared (23 May 2013). "Amprius Begins Shipping a Better Smartphone Battery". Time. Retrieved 4 June 2013.
169. Coxworth, Ben (22 February 2017). "Silicon sawdust – coming soon to a battery near you?". newatlas.com. Retrieved 26 February 2017.
170. Kasavajjula, U.; Wang, C.; Appleby, A.J. C.. (2007). "Nano- and bulk-silicon-based insertion anodes for lithium-ion secondary cells". Journal of Power Sources. 163 (2): 1003–1039. Bibcode:2007JPS...163.1003K. doi:10.1016/j.jpowsour.2006.09.084.
171. Li, H.; Huang, X.; Chenz, L. C.; Zhou, G.; Zhang, Z. (2000). "The crystal structural evolution of nano-Si anode caused by lithium insertion and extraction at room temperature". Solid State Ionics. 135 (1–4): 181–191. doi:10.1016/S0167-2738(00)00362-3.
172. Gao, B.; Sinha, S.; Fleming, L.; Zhou, O. (2001). "Alloy Formation in Nanostructured Silicon". Advanced Materials. 13 (11): 816–819. doi:10.1002/1521-4095(200106)13:11<816::AID-ADMA816>3.0.CO;2-P.
173. Girishkumar, G.; McCloskey, B.; Luntz, A. C.; Swanson, S.; Wilcke, W. (2 July 2010). "Lithium−Air Battery: Promise and Challenges". The Journal of Physical Chemistry Letters. 1 (14): 2193–2203. doi:10.1021/jz1005384. ISSN 1948-7185.
174. "A Better Anode Design to Improve Lithium-Ion Batteries". Berkeley Lab: Lawrence Berkeley National Laboratory. Archived from the original on 4 March 2016.
175. Luo, Jiayan; Zhao, Xin; Wu, Jinsong; Jang, Hee Dong; Kung, Harold H.; Huang, Jiaxing (2012). "Crumpled Graphene-Encapsulated Si Nanoparticles for Lithium Ion Battery Anodes". The Journal of Physical Chemistry Letters. 3 (13): 1824–1829. doi:10.1021/jz3006892. PMID 26291867.
176. Summerfield, J. (2013). "Modeling the Lithium Ion Battery". Journal of Chemical Education. 90 (4): 453–455. Bibcode:2013JChEd..90..453S. doi:10.1021/ed300533f.
177. Andrea 2010, p. 229.
178. "Lithium-ion laptop battery". Ultrabook Batteries. Ritz Stefan. Retrieved 23 March 2014.
179. "A Guide to Choosing Best Power Tool Battery for Your Cordless Tools". Best Power Tools For Sale, Expert Reviews and Guides. 25 October 2018. Retrieved 31 October 2018.
180. Miller, Peter (10 January 2015). "Automotive Lithium-Ion Batteries". Johnson Matthey Technology Review. 59 (1): 4–13. doi:10.1595/205651315x685445.
181. "Silent 2 Electro". Alisport. Archived from the original on 17 February 2015. Retrieved 6 December 2014.
182. "Pipistrel web site". Archived from the original on 2 July 2017. Retrieved 6 December 2014.
183. "Ventus-2cxa with FES propulsion system". Schempp-Hirth. Archived from the original on 2 April 2015. Retrieved 11 March 2015.
184. GR-3150-CORE, Generic Requirements for Secondary Non-Aqueous Lithium Batteries.
185. Sanyo: Overview of Lithium Ion Batteries. Archived 3 March 2016 at the Wayback Machine, listing self-discharge rate of 2%/mo.
186. Sanyo: Harding energy specification. Archived 27 December 2015 at the Wayback Machine, listing self-discharge rate of 0.3%/mo.
187. Zimmerman, A. H. (2004). "Self-discharge losses in lithium-ion cells". IEEE Aerospace and Electronic Systems Magazine. 19 (2): 19–24. doi:10.1109/MAES.2004.1269687.
188. Weicker, Phil (1 November 2013). A Systems Approach to Lithium-Ion Battery Management. Artech House. p. 214. ISBN 978-1-60807-659-8.
189. Abe, H.; Murai, T.; Zaghib, K. (1999). "Vapor-grown carbon fiber anode for cylindrical lithium ion rechargeable batteries". Journal of Power Sources. 77 (2): 110–115. Bibcode:1999JPS....77..110A. doi:10.1016/S0378-7753(98)00158-X.
190. Battery performance characteristics, MPower UK, 23 February 2007. Information on self-discharge characteristics of battery types.
191. Vetter, Matthias; Lux, Stephan (2016). "Rechargeable Batteries with Special Reference to Lithium-Ion Batteries" (PDF). Storing Energy. Fraunhofer Institute for Solar Energy Systems ISE. p. 205. doi:10.1016/B978-0-12-803440-8.00011-7. ISBN 9780128034408.
192. Winter & Brodd 2004, p. 4259
193. "Best rechargeable batteries (10+ charts, overviews and comparisons )". eneloop101.com. Retrieved 9 February 2019.
194. "Lithium-ion Battery DATA SHEET Battery Model : LIR18650 2600mAh" (PDF).
195. Wang, J.; Liu, P.; Hicks-Garner, J.; Sherman, E.; Soukiazian, S.; Verbrugge, M.; Tataria, H.; Musser, J.; Finamore, P. (2011). "Cycle-life model for graphite-LiFePO4 cells". Journal of Power Sources. 196 (8): 3942–3948. Bibcode:2011JPS...196.3942W. doi:10.1016/j.jpowsour.2010.11.134.
196. Saxena, S.; Hendricks, C.; Pecht, M. (2016). "Cycle life testing and modeling of graphite/LiCoO2 cells under different state of charge ranges". Journal of Power Sources. 327: 394–400. Bibcode:2016JPS...327..394S. doi:10.1016/j.jpowsour.2016.07.057.
197. Saxena, S.; Hendricks, C.; Pecht, M. (2016). "Cycle life testing and modeling of graphite/LiCoO2 cells under different state of charge ranges". Journal of Power Sources. 327: 394–400. Bibcode:2016JPS...327..394S. doi:10.1016/j.jpowsour.2016.07.057..
198. Sun, Y.; Saxena, S.; Pecht, M. (2018). "Derating Guidelines for Lithium-Ion Batteries". Energies. 11 (12): 3295. doi:10.3390/en11123295.
199. Hendricks, C.; Williard, N.; Mathew, S.; Pecht, M. (2016). "A failure modes, mechanisms, and effects analysis (FMMEA) of lithium-ion batteries". Journal of Power Sources. 327: 113–120. doi:10.1016/j.jpowsour.2015.07.100..
200. Waldmann, T.; Wilka, M.; Kasper, M.; Fleischhammer, M.; Wohlfahrt-Mehrens, M. (2014). "Temperature dependent ageing mechanisms in Lithium-ion batteries – A Post-Mortem study". Journal of Power Sources. 262: 129–135. Bibcode:2014JPS...262..129W. doi:10.1016/j.jpowsour.2014.03.112.
201. Leng, Feng; Tan, Cher Ming; Pecht, Michael (6 August 2015). "Effect of Temperature on the Aging rate of Li Ion Battery Operating above Room Temperature". Scientific Reports. 5 (1): 12967. Bibcode:2015NatSR...512967L. doi:10.1038/srep12967. PMC 4526891. PMID 26245922.
202. Cristo, L.M. & Atwater, T. B. Characteristics and Behavior of Cycled Aged Lithium Ion Cells. Fort Monmouth, NJ: U.S. Army Research.
203. Waldmann, T.; Bisle, G.; Hogg, B. -I.; Stumpp, S.; Danzer, M. A.; Kasper, M.; Axmann, P.; Wohlfahrt-Mehrens, M. (2015). "Influence of Cell Design on Temperatures and Temperature Gradients in Lithium-Ion Cells: An in Operando Study". Journal of the Electrochemical Society. 162 (6): A921. doi:10.1149/2.0561506jes..
204. Andrea 2010, p. 9.
205. Liaw, B. Y.; Jungst, R. G.; Nagasubramanian, G.; Case, H. L.; Doughty, D. H. (2005). "Modeling capacity fade in lithium-ion cells". Journal of Power Sources. 140 (1): 157–161. Bibcode:2005JPS...140..157L. doi:10.1016/j.jpowsour.2004.08.017.
206. Voelker, Paul (22 April 2014). "Trace Degradation Analysis of Lithium-Ion Battery Components". R&D. Retrieved 4 April 2015.
207. "How to prolong your cell phone battery's life span". phonedog.com. 7 August 2011. Retrieved 25 July 2020.
208. Alexander K Suttman.(2011).Lithium Ion Battery Aging Experiments and Algorithm Development for Life Estimation. Published by The Ohio State University and OhioLINK
209. Matthew B. Pinson1 and Martin Z. Bazant. Theory of SEI Formation in Rechargeable Batteries: Capacity Fade, Accelerated Aging and Lifetime Prediction. Massachusetts Institute of Technology, Cambridge, MA 02139
210. "New Data Shows Heat & Fast-Charging Responsible For More Battery Degradation Than Age Or Mileage". CleanTechnica. 16 December 2019.
211. "How iOS 13 Will Save Your iPhone's Battery (by Not Fully Charging It)". www.howtogeek.com.
212. "How Often Should I Charge My Phone To Prolong The Battery Life?". 21 February 2019.
213. Jary, Simon. "Battery charging tips and tricks for prolonged life". Tech Advisor.
214. Reynolds, Matt (4 August 2018). "Here's the truth behind the biggest (and dumbest) battery myths" – via www.wired.co.uk.
215. "Why You Should Stop Fully Charging Your Smartphone Now". Electrical Engineering News and Products. 9 November 2015.
216. Tip: Condition your new cell phone’s battery to make it last longer (but be sure to condition it properly). Dottech.org (24 December 2011). Retrieved 16 April 2013.
217. Yadav, Antriksh (31 December 2010) Top 5 lithium-ion battery myths. Rightnowintech.com.
218. Hislop, Martin (1 March 2017). "Solid-state EV battery breakthrough from Li-ion battery inventor John Goodenough". North American Energy News. The American Energy News. Retrieved 15 March 2017.
219. Millsaps, C. (10 July 2012). Second Edition of IEC 62133: The Standard for Secondary Cells and Batteries Containing Alkaline or Other Non-Acid Electrolytes is in its Final Review Cycle. Retrieved from Battery Power Online (10 January 2014)
220. "Samsung recall for Galaxy Note 7". news.com.au. 2 September 2016. Archived from the original on 2 September 2016.
221. Kanellos, Michael (15 August 2006). "Can anything tame the battery flames?". Cnet. Retrieved 14 June 2013.
222. Electrochem Commercial Power (9 September 2006). "Safety and handling guidelines for Electrochem Lithium Batteries" (PDF). Rutgers University. Retrieved 21 May 2009.
223. Mikolajczak, Celina; Kahn, Michael; White, Kevin & Long, Richard Thomas (July 2011). "Lithium-Ion Batteries Hazard and Use Assessment" (PDF). Fire Protection Research Foundation. pp. 76, 90, 102. Archived from the original (PDF) on 13 May 2013. Retrieved 27 January 2013.
224. Topham, Gwyn (18 July 2013). "Heathrow fire on Boeing Dreamliner 'started in battery component'". The Guardian.
225. "Boeing 787 aircraft grounded after battery problem in Japan". BBC News. 14 January 2014. Retrieved 16 January 2014.
226. Chen, Mingyi; Liu, Jiahao; He, Yaping; Yuen, Richard; Wang, Jian (October 2017). "Study of the fire hazards of lithium-ion batteries at different pressures". Applied Thermal Engineering. 125: 1061–1074. doi:10.1016/j.applthermaleng.2017.06.131. ISSN 1359-4311.
227. Spotnitz, R.; Franklin, J. (2003). "Abuse behavior of high-power, lithium-ion cells". Journal of Power Sources. 113 (1): 81–100. Bibcode:2003JPS...113...81S. doi:10.1016/S0378-7753(02)00488-3.
228. Finegan, D. P.; Scheel, M.; Robinson, J. B.; Tjaden, B.; Hunt, I.; Mason, T. J.; Millichamp, J.; Di Michiel, M.; Offer, G. J.; Hinds, G.; Brett, D. J. L.; Shearing, P. R. (2015). "In-operando high-speed tomography of lithium-ion batteries during thermal runaway". Nature Communications. 6: 6924. Bibcode:2015NatCo...6.6924F. doi:10.1038/ncomms7924. PMC 4423228. PMID 25919582.
229. Väyrynen, A.; Salminen, J. (2012). "Lithium ion battery production". The Journal of Chemical Thermodynamics. 46: 80–85. doi:10.1016/j.jct.2011.09.005.
230. "Lithium-ion Battery Charging Basics". PowerStream Technologies. Retrieved 4 December 2010.
231. Cringely, Robert X. (1 September 2006). "Safety Last". The New York Times. Retrieved 14 April 2010.
232. "Kyocera Launches Precautionary Battery Recall, Pursues Supplier of Counterfeit Batteries" (Press release). Kyocera Wireless. 28 October 2004. Archived from the original on 7 January 2006. Retrieved 15 June 2010.
233. Tullo, Alex (21 August 2006). "Dell Recalls Lithium Batteries". Chemical and Engineering News. 84 (34): 11. doi:10.1021/cen-v084n034.p011a.
234. Hales, Paul (21 June 2006). Dell laptop explodes at Japanese conference. The Inquirer. Retrieved 15 June 2010.
235. "Nokia issues BL-5C battery warning, offers replacement". Wikinews. 14 August 2007. Retrieved 8 October 2009.
236. Nokia N91 cell phone explodes. Mukamo – Filipino News (27 July 2007). Retrieved 15 June 2010.
237. "Samsung pins explosive Galaxy Note 7 on battery flaw". Retrieved 18 September 2016.
238. United States Code of Federal Regulations, Title 49: Transportation, Subtitle B: Other regulations relating to transportation, Chapter I: Pipeline and hazardous materials safety administration, department of transportation, Subchapter C: Hazardous materials regulations, Part 175: Carriage by aircraft, Subpart A: General information and regulations, Section 10: Exceptions for passengers, crewmembers, and air operators, 49 C.F.R. 175.10.
239. Galbraith, Rob (3 January 2008). "U.S. Department of Transportation revises lithium battery rules press release". Little Guy Media. Archived from the original on 23 November 2008. Retrieved 11 May 2009.
240. Prohibitions – 6.3.12 – Dangerous, offensive and indecent articles Archived 1 May 2014 at the Wayback Machine (PDF). Hong Kong Post Office Guide. December 2009. Retrieved 15 June 2010.
241. International Mail > FAQs > Goods/Services: Shipping a Laptop. Japan Post Service Co. Ltd. Retrieved 15 June 2010.
242. "Posting Restricted Items Overseas & UK". Royal Mail.
243. Ungerleider, Neal. USPS To Stop Delivering iPads And Kindles To Troops And Overseas Consumers On 16 May. USPS.
244. Just in Time for the Holidays, U.S. Postal Service to Begin Global Shipping of Packages with Lithium Batteries. USPS. 9 November 2012.
245. "AP Exclusive: Airlines reject rechargeable battery shipments". US News & World Report. 3 March 2015
246. Webster, Harry (June 2004) Flammability Assessment of Bulk-Packed, Nonrechargeable Lithium Primary Batteries in Transport Category Aircraft. U.S. Department of Transportation
247. "Airlines Stop Taking Lithium Battery Shipments". YouTube. 3 March 2015.
248. "Lithium ion cells for Aerospace applications: LVP series" (PDF). GS UASA. Retrieved 17 January 2013.
249. Dalløkken, Per Erlien (17 January 2013). "Her er Dreamliner-problemet". Teknisk Ukeblad (in Norwegian). Retrieved 17 January 2013.
250. Grant Martin (18 January 2018). "Airline Smart Luggage Ban Goes Into Effect". Forbes.
251. Dani Deahl (9 February 2018). "Airlines are mistakenly stopping approved smart luggage from being carried on flights". The Verge.
252. Callum Tennent (6 June 2018). "Big brands go bust as smart luggage is banned on major US airlines". Which.
253. Hanisch, Christian; Diekmann, Jan; Stieger, Alexander; Haselrieder, Wolfgang; Kwade, Arno (2015). "27". In Yan, Jinyue; Cabeza, Luisa F.; Sioshansi, Ramteen (eds.). Handbook of Clean Energy Systems – Recycling of Lithium-Ion Batteries (5 Energy Storage ed.). John Wiley & Sons, Ltd. pp. 2865–2888. doi:10.1002/9781118991978.hces221. ISBN 9781118991978.
254. Hanisch, Christian. "Recycling of Lithium-Ion Batteries" (PDF). Presentation on Recycling of Lithium-Ion Batteries. Lion Engineering GmbH. Retrieved 22 July 2015.
255. Kamyamkhane, Vaishnovi. "Are lithium batteries sustainable to the environment?". Alternative Energy Resources. Archived from the original on 17 September 2011. Retrieved 3 June 2013.
256. "ATZ WORLDWIDE". uacj-automobile.com. Retrieved 14 June 2019.
257. Application of Life-Cycle Assessment to Nanoscale Technology: Lithium-ion Batteries for Electric Vehicles (Report). Washington, DC: U.S. Environmental Protection Agency (EPA). 2013. EPA 744-R-12-001.
258. "Can Nanotech Improve Li-ion Battery Performance". Environmental Leader. 30 May 2013. Archived from the original on 21 August 2016. Retrieved 3 June 2013.
259. Franco, Alejandro (7 April 2015). Rechargeable lithium batteries : from fundamentals to applications. Franco, Alejandro A. Cambridge, UK. ISBN 9781782420989. OCLC 907480930.
260. "How "Green" is Lithium?". 16 December 2014.
261. "European Commission, Science for Environment Policy, News Alert Issue 303" (PDF). October 2012.
262. Regett, Anika; Mauch, Wolfgang; Wagner, Ulrich. "Carbon footprint of electric vehicles - a plea for more objectivity" (PDF). Retrieved 2 September 2019.
263. Helms, Hinrich (April 2016). "Weiterentwicklung undvertiefte Analyse derUmweltbilanz von Elektrofahrzeugen" (PDF). Retrieved 14 June 2019.
264. Buchert, Matthias (14 December 2016). "Aktualisierte Ökobilanzen zum Recyclingverfahren LithoRec II für Lithium-Ionen-Batterien" (PDF).

Further reading

• Andrea, Davide (2010). Battery Management Systems for Large Lithium-Ion Battery Packs. Artech House. p. 234. ISBN 978-1608071043. Retrieved 3 June 2013.CS1 maint: ref=harv (link)
• Winter, M; Brodd, RJ (2004). "What Are Batteries, Fuel Cells, and Supercapacitors?". Chemical Reviews. 104 (10): 4245–69. doi:10.1021/cr020730k. PMID 15669155.CS1 maint: ref=harv (link)

External links

• Energy Storage Safety at National Renewable Energy Laboratory
• NREL Innovation Improves Safety of Electric Vehicle Batteries, National Renewable Energy Laboratory, October 2015
• Degradation Mechanisms and Lifetime Prediction for Lithium-Ion Batteries – A Control Perspective, National Renewable Energy Laboratory, July 2015.
• Addressing the Impact of Temperature Extremes on Large Format Li-ion Batteries for Vehicle Applications, National Renewable Energy Laboratory, March 2013.
• Lithium-Ion battery charging using the CC-CV method – a detailed theoretical explanation and a practical implementation on Arduino.