| 摘要 |
A nonaqueous electrolyte secondary battery (10) includes a positive electrode plate (11), a negative electrode plate (12), a separator (13), and a nonaqueous electrolytic solution. The separator (13) is constituted of a polyolefin microporous membrane constituted of two or more layers of stacked film containing polyethylene and polypropylene, one or both of the surface layers has a polypropylene mixture proportion exceeding 50% by mass and contains inorganic particles, and the nonaqueous electrolytic solution contains a dinitrile compound expressed by CN-(CH 2 )n-CN (where n ‰¥ 1 and n is an integer). Thus, the nonaqueous electrolyte secondary battery that even when stored at high temperature in a charged state is not prone to positive electrode degradation and has a large post-high temperature storage capacity recovery rate and good cycling characteristics can be provided. |
