| abstract |
A lithium secondary battery in which separator shutdown reliably operates in the entire separator even when abnormal heat generation in the battery is large is obtained. In a lithium secondary battery having a positive electrode 3, a negative electrode 7, and a separator 8 disposed between the positive electrode 3 and the negative electrode 7, the melting point is 65 ° C. or higher and lower than 100 ° C., and the heat of fusion is endothermic. An endothermic agent was added. [Selection] Figure 1 |