NON-AQUEOUS ELECTROLYTIC SOLUTION FOR POWER STORAGE DEVICE, AND POWER STORAGE DEVICE

To provide a non-aqueous electrolyte solution for storage battery devices which has high lithium salt solubility, high conductivity and excellent cycle characteristics, and a storage battery device wherein such a non-aqueous electrolyte solution is used. [0002] A non-aqueous electrolyte solution for storage battery devices, which comprises a specific lithium salt (A) and a solvent (B) containing a hydrofluoroether (b1) represented by CFCHOCFCFH and a carbonate type solvent (b2), wherein the content of the hydrofluoroether (b1) is from 1 to 30 vol% based on the total amount i.e. 100 vol% of the solvent (B); and a storage battery device wherein such a non-aqueous electrolyte solution for storage battery devices is used.