| 摘要 |
PROBLEM TO BE SOLVED: To provide a separator for a lithium ion secondary battery, capable of realizing a battery manufactured by the conventional manufacturing process for the lithium ion secondary battery and having no possibility of electrolyte leakage, and keeping the safety of the battery by intercepting the flow of lithium ion when the temperature of the interior of the battery is raised due to shutdown characteristic. SOLUTION: This separator for the lithium battery is mad of a three-layer structure porous film in which both surface layers are porous layers formed of copolymer containing vinylidene fluoride and having a melting point of 145 deg.C or higher, and an intermediate layer is a porous layer formed of polyolefin and having a melting point of 140 deg.C.
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