ELECTROLYTIC SOLUTION FOR NON-AQUEOUS SECONDARY BATTERY, AND NON-AQUEOUS SECONDARY BATTERY

A nonaqueous secondary battery electrolyte solution for use in a nonaqueous secondary battery comprising vanadium sulfide as a cathode active material and a lithium-containing compound as an anode active material, the nonaqueous secondary battery electrolyte solution comprising lithium bis(fluorosulfonyl)imide (LiFSI), a cyclic carbonate, and a hydrofluoroether (HFE).