Patent ID: 8263268

Claim:
A nonaqueous electrolytic solution for a lithium secondary battery, the solution comprising an electrolyte dissolved in a nonaqueous solvent and an ester compound represented by formula (III) in an amount of from 0.01 to 10% by weight of the nonaqueous electrolytic solution: wherein: R 11 , R 13 , R 14 and R 15 each independently represent a hydrogen atom or a fluorine atom; R 12 represents a hydrogen atom, a fluorine atom, a methoxy group or an ethoxy group; at least one of R 11 to R 15 is a fluorine atom; L 2 represents an alkenyl group having from 2 to 6 carbon atoms, an alkynyl group having from 3 to 6 carbon atoms, or a biphenyl group.