Non-aqueous electrolytic solution

摘要

There is provided a non-aqueous electrolytic solution comprising an electrolyte salt, a specific fluorine-containing solvent and a fluorine-containing cyclic carbonate represented by the formula (A1):;
wherein X1 to X4 are the same or different and each is —H, —F, —CF3, —CHF2, —CH2F, —CF2CF3, —CH2CF3 or —CH2OCH2CF2CF3; at least one of X1 to X4 is —F, —CF3, —CF2CF3, —CH2CF3 or —CH2OCH2CF2CF3, and the non-aqueous electrolytic solution has further excellent noncombustibility and is suitable for lithium secondary batteries.

主权项

1. 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 X1 is —CF3—CH2CF3 or —CH2OCH2CF2CF3; and X2, X3 and X4 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).