“Water-in-salt” electrolyte enables high-voltage aqueous lithium-ion chemistries

Author:

Suo Liumin1,Borodin Oleg2,Gao Tao1,Olguin Marco2,Ho Janet2,Fan Xiulin1,Luo Chao1,Wang Chunsheng1,Xu Kang2

Affiliation:

1. Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA.

2. Electrochemistry Branch, Sensor and Electron Devices Directorate, Power and Energy Division, U.S. Army Research Laboratory, Adelphi, MD 20783, USA.

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. 918

Funder

DOE ARPA-E

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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