| abstract |
PROBLEM TO BE SOLVED: To provide a technique for suppressing decomposition of a solvent of an electrolytic solution of a secondary battery. In addition, a technique for improving the cycle life of the secondary battery is provided. Further, the present invention provides a technique for improving storage characteristics such as suppression of resistance increase of a secondary battery and improvement of capacity retention rate. An electrolytic solution containing an aprotic solvent and a cyclic sulfonic acid ester having at least two sulfonyl groups is used. [Selection] Figure 1 |