Patent ID: 8530080

Claim:
A nonaqueous electrolytic solution for a lithium secondary battery, in which an electrolyte salt is dissolved in nonaqueous solvent, comprising: 0.1 to 10% by weight of fluoroethylene carbonate; and 0.05 to 5% by weight of (B) a pentafluorophenyloxy compound represented by the general formula (X): wherein R 15 represents a C 2 to C 12 alkylcarbonyl group, a C 2 to C 12 alkoxycarbonyl group, a C 7 to C 18 aryloxycarbonyl group or a C 1 to C 12 alkanesulfonyl group, wherein at least one of the hydrogen atoms of R 15 is optionally-substituted with a halogen atom or a C 6 to C 18 aryl group, wherein the mixing ratio [((B) the pentafluorophenyloxy compound):(fluorothylene carbonate)] (weight ratio) of (B) the pentafluorophenyloxy compound to fluorothylene carbonate is 2:98 to 95:5.