| 摘要 |
Disclosed is a nonaqueous electrolyte solution which contains a nonaqueous solvent, an electrolyte salt dissolved in the nonaqueous solvent, and a conjugated carbonyl compound represented by formula (1) and contained in the nonaqueous electrolyte solution. A secondary battery using this nonaqueous electrolyte solution has excellent cycle characteristics in a high temperature environment even in cases where a negative electrode active material containing silicon is used therein. (In the formula, R1 represents R2a or -CO-R2a, and R2a represents the same as R2 which represents a hydrogen atom, an acyl group, an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, a substituted or unsubstituted aromatic group, an oxyalkylene group, an alkoxy group, a cycloalkyloxy group, an alkenyloxy group, an alkynyloxy group, an aromatic oxy group, an oxyalkyleneoxy group or the like.) |
