POROUS FILM, SEPARATOR FOR SECONDARY BATTERY AND SECONDARY BATTERY

To provide a separator for a secondary battery which has high heat resistance, and an excellent strength balance between battery characteristics and a porous layer at low cost.SOLUTION: A porous film has a porous base material, and a porous layer containing a heat-resistant resin and inorganic parti...

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Bibliographic Details
Main Authors SAWATARI AYA, TSUKUDA AKIMITSU, IKOMA HIROSHI
Format Patent
LanguageEnglish
Japanese
Published 11.04.2022
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRICITY
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
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Summary:To provide a separator for a secondary battery which has high heat resistance, and an excellent strength balance between battery characteristics and a porous layer at low cost.SOLUTION: A porous film has a porous base material, and a porous layer containing a heat-resistant resin and inorganic particles, in which a falling-ball film breaking temperature is 400°C or higher, and a relation between air permeability (G) and ion conductivity (I) satisfies Expression (1): G/I>1.0×e6.SELECTED DRAWING: None 【課題】本発明の目的は、高い耐熱性を有し、電池特性と多孔質層の強度バランスに優れた二次電池用セパレータを低コストで提供することにある。【解決手段】多孔質基材と、耐熱性樹脂と無機粒子とを含む多孔質層を有する多孔性フィルムであって、落球破膜温度が４００℃以上であり、透気度（Ｇ）とイオン伝導度（Ｉ）の関係が式（１）を満たすことを特徴とする、多孔性フィルム。式（１） Ｇ／Ｉ＞１．０×ｅ６【選択図】なし
Bibliography:Application Number: JP20200164820