Open AccessCommunication—Redox Behavior of Cu2S in Li2S-Dissolving Aprotic Electrolyte for Sulfide-Ion Batteries
Author(s) -
Ryo Fukunaga,
Antoine Allanore,
Shunsuke Yagi
Publication year - 2020
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/abadbd
Subject(s) - dissolution , redox , electrolyte , chemistry , inorganic chemistry , sulfide , solubility , dimethyl sulfoxide , graphite , ion , supporting electrolyte , electrode , organic chemistry
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.