| 摘要 |
PURPOSE: A separator sheet is provided to suppress the contraction of a substrate layer by a heat resistant layer, thereby improving battery safety. CONSTITUTION: A separator sheet(5) includes a substrate layer(51) consisting of a polyolefin-based resin material; a heat resistant layer(52) which is formed on the substrate layer, and contains crosslinked polyimide; and an adhesive layer(53) which is formed on the heat resistant layer. The crosslinked polyimide has a benzophenone skeleton which is derived from an anhydride composing an imide ring, and a phenyl skeleton which is derived from diamine composing an imide ring. The phenyl skeleton contains a chemical structure with a C1-20 alkyl group at the ortho position thereof.
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