“Water-in-salt” electrolyte enables high-voltage aqueous lithium-ion chemistries
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- 20 November 2015
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 350 (6263), 938-943
- https://doi.org/10.1126/science.aab1595
Abstract
A concentrated effort for battery safety: Aqueous electrolytes are limited to run below 1.23 V to avoid degradation. Suo et al. smash through this limit with an aqueous salt solution containing lithium (Li) bis(trifluoromethane sulfonyl)imide to create an electrolyte that has an electrochemical window of 3 V (see the Perspective by Smith and Dunn). They used extremely high-concentration solutions, which suppressed hydrogen evolution and electrode oxidation. At these concentrations, the Li solvation shell changes because there simply is not enough water to neutralize the Li + charge. Thus, flammable organic electrolytes could potentially be replaced with a safer aqueous alternative. Science , this issue p. 938 ; see also p. 918Keywords
Funding Information
- DOE ARPA-E (DEAR0000389)
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