Patent ID: 8871384

Claim:
A non-aqueous electrolytic solution comprising: (I) a solvent for dissolving an electrolyte salt comprising (A) a fluorine-containing cyclic carbonate represented by the formula (A1): wherein X 1 is —CF 3 —CH 2 CF 3 or —CH 2 OCH 2 CF 2 CF 3 ; and X 2 , X 3 and X 4 each is —H, and (B3) a fluorine-containing chain carbonate, and (C) at least one fluorine-containing solvent selected from the group consisting of (C1) a fluorine-containing lactone, (C2) at least one fluorine-containing solvent selected from the group consisting of monofluorobenzene, hexafluorobenzene, difluorobenzene, trifluorobenzene, tetrafluorobenzene and pentafluorobenzene and (C3) a fluorine-containing sulfolane derivative, and (II) an electrolyte salt, and wherein the solvent (I) for dissolving an electrolyte salt comprises 10 to 60% by volume of the fluorine-containing cyclic carbonate (A), 40 to 90% by volume of the fluorine-containing chain carbonate (B3) and 0.5 to 20% by volume of fluorine-containing solvent (C), based on the whole solvent (I).