| 摘要 |
The present invention provides a sodium secondary battery. The sodium secondary battery includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a nonaqueous electrolytic solution, the separator is composed of a porous laminate film in which a heat resistant porous layer and a porous film are stacked each other, and the heat resistant porous layer is disposed on the negative electrode side.
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