Salt water battery

A salt water battery employs a concentrated saline solution as its electrolyte. They are nonflammable and more easily recycled than batteries that employ toxic or flammable materials.[1]

History

In 2008 Carnegie Mellon professor Jay Whitacre founded Aquion Energy and received venture funding from Kleiner Perkins Caufield and Byers. He won the 2015 Lemelson–MIT Prize, an award worth $500,000, for inventing the company's salt water battery. They are the first and only battery manufacturer to have met all the stringent criteria to obtain Cradle-to-Cradle (Bronze) certification.[2] The company raised $190 million in equity and debt before going bankrupt in 2017, then being acquired by a Chinese company later that year for slightly under $10 million.[3]

Design

Aquion Energy

Aquion Energy's batteries are classified as standard goods with no special handling required in shipment. It has no life-reducing side reactions while not in use. It is robust to any variable cycling profiles and long duration intervals while partially charged. Maintenance cycling to maintain performance/life is unnecessary. Its optimal operating temperature range is -5 °C to 40 °C and are little affected by operational temperature swings. It operates without auxiliary loads or an external power supply. Its chemistry is not susceptible to thermal runaway. Active thermal management is generally not required, except given extreme ambient temperature. Its mechanical materials can be recycled in normal recycling streams. Chemical materials can be disposed of without special equipment or containers.

Water in salt

A different design used an electrolyte that has a salt to water ratio of six to one, nearly saturated, such that it could also be called a water in salt battery.[1]

Solid-electrolyte interphase

In November 2015, researchers from the University of Maryland and the Army Research Laboratory claimed that they had induced the cell to form a Solid-electrolyte interphase (SEI), a first for an aqueous electrolyte. The SEI allows the aqueous lithium-ion battery to operate at higher voltages and self-discharge more slowly. The high salt concentration allows the interphase to form. It raised the maximum voltage for such a battery from 1.23 V to around 3 V. At 2.4V, the battery's specific energy was approximately 100 watt-hour/kg and it displayed consistent performance over 1,000 charge/discharge cycles.[4] The device operated with nearly 100% coulombic efficiency at both low (0.15 C) and high (4.5 C) discharge and charge rates.[4]

In September 2017, researchers stated they were able to raise the voltage to 4.0 volts.[5][6]

In May 2019, researchers published an article where the voltage increased to 4.2 volts.[7] High specific capacity from a densely packed stage-I graphite intercalation compound of C3.5[Br0.5Cl0.5] can form reversibly in water-in-bisalt electrolyte.[7] By coupling this cathode with a passivated graphite anode, a cell can achieve an energy density of 460 watt-hours per kilogram of total composite electrode and about 100 per cent coulombic efficiency.[8]

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See also

References
  1. Borgino, Dario (December 6, 2015). ""Water-in-salt" battery bodes well for greener, safer grid storage". www.gizmag.com. Retrieved 2015-12-08.
  2. Ferris, Robert (15 September 2015). "Low-cost saltwater battery wins $500,000 award". CNBC. Retrieved 2015-12-08.
  3. Spector, Julian. "Saltwater's Second Wave: Aquion Has Emerged From Bankruptcy Under a New Owner". gtm. Greentech Media. Retrieved 10 August 2017.
  4. Suo, Liumin; Borodin, Oleg; Gao, Tao; Olguin, Marco; Ho, Janet; Fan, Xiulin; Luo, Chao; Wang, Chunsheng; Xu, Kang (2015-11-20). ""Water-in-salt" electrolyte enables high-voltage aqueous lithium-ion chemistries". Science. 350 (6263): 938–943. doi:10.1126/science.aab1595. ISSN 0036-8075. PMID 26586759.
  5. "Army, UMD researchers develop water-based lithium-ion batteries that don't explode | U.S. Army Research Laboratory". www.arl.army.mil. Retrieved 2019-05-13.
  6. Xu, Kang; Wang, Chunsheng; Eidson, Nico; Schroeder, Marshall A.; Vatamanu, Jenel; Borodin, Oleg; Ding, Michael S.; Cresce, Arthur von; Sun, Wei (2017-09-06). "4.0 V Aqueous Li-Ion Batteries". Joule. 1 (1): 122–132. doi:10.1016/j.joule.2017.08.009. ISSN 2542-4785.
  7. Wang, Chunsheng; Xu, Kang; Ren, Yang; Borodin, Oleg; Wang, Yingqi; Qing, Tingting; Hou, Singyuk; Liu, Cunming; Liu, Qi (May 2019). "Aqueous Li-ion battery enabled by halogen conversion–intercalation chemistry in graphite". Nature. 569 (7755): 245–250. doi:10.1038/s41586-019-1175-6. ISSN 1476-4687.
  8. "Army discovery opens path to safer batteries | U.S. Army Research Laboratory". www.arl.army.mil. Retrieved 2019-05-13.
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