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

Author(s)
Fukunaga, Ryo; Allanore, Antoine; Yagi, Shunsuke
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Abstract
The redox behavior of Cu2S in a Li2S-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 S2- at over 0.10 M concentration by adding NH4NO3 to increase the solubility of Li2S, which is hardly soluble in almost all aprotic solvents. Two redox reactions of Cu2S, Cu/Cu2S and Cu2S/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.
Date issued
2020
URI
https://hdl.handle.net/1721.1/142473
Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Journal
Journal of the Electrochemical Society
Publisher
The Electrochemical Society
Citation
Fukunaga, Ryo, Allanore, Antoine and Yagi, Shunsuke. 2020. "Communication—Redox Behavior of Cu 2 S in Li 2 S-Dissolving Aprotic Electrolyte for Sulfide-Ion Batteries." Journal of the Electrochemical Society, 167 (12).
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