Communication—Redox Behavior of Cu 2 S in Li 2 S-Dissolving Aprotic Electrolyte for Sulfide-Ion Batteries

The redox behavior of Cu 2 S in a Li 2 S-dissolving aprotic electrolyte was investigated to examine the practical viability of rechargeable batteries using sulfide ions as carrier ions. We established aprotic electrolytes, dimethyl sulfoxide and dimethylformamide containing S 2− at over 0.10 M conce...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2020-01, Vol.167 (12), p.122504
Main Authors: Fukunaga, Ryo, Allanore, Antoine, Yagi, Shunsuke
Format: Article
Language:English
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Summary:The redox behavior of Cu 2 S in a Li 2 S-dissolving aprotic electrolyte was investigated to examine the practical viability of rechargeable batteries using sulfide ions as carrier ions. We established aprotic electrolytes, dimethyl sulfoxide and dimethylformamide containing S 2− at over 0.10 M concentration by adding NH 4 NO 3 to increase the solubility of Li 2 S, which is hardly soluble in almost all aprotic solvents. Two redox reactions of Cu 2 S, Cu/Cu 2 S and Cu 2 S/CuS, were observed at −0.25 V and 0.60 V vs Mo, respectively. In addition, it was found that elemental S is electrodeposited/stripped at approximately 0.1 V vs Mo on graphite but not on platinum.
ISSN:0013-4651
1945-7111
DOI:10.1149/1945-7111/abadbd