SECONDARY BATTERY SEPARATOR AND USE THEREOF, SLURRY COMPOSITION FOR SECONDARY BATTERY SEPARATOR, AND RESIN PARTICLE FOR SECONDARY BATTERY SEPARATOR

• Main Authors: YAMAUCHI TOMOHIRO, AOKI TAKAYUKI
• Format: Patent
• Language: English; Japanese
• Published: 10.02.2022
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

To provide a secondary battery separator superior in the property of binding a porous layer having inorganic particles and a porous base material layer and the permeability of a liquid electrolyte, and low in thermal shrinkage rate, and its use, a resin particle for a secondary battery separator, which can be suitably used for the secondary battery separator, and a slurry composition for a secondary battery separator.MEANS FOR SOLVING THE PROBLEM: A secondary battery separator comprises: a porous base material layer (A); and a porous layer (B) containing inorganic particles (b-1) and resin particles (b-2). The particle (b-2) is formed by an outer shell part made of an organic resin, and a space portion surrounded by the outer shell part. The ratio (A50/A10) of a volume-based cumulative 10%-particle diameter (A10) and a volume-based cumulative 50%-particle diameter (A50) of the particles (b-2) is 1.1 or larger. The ratio (d1/d2) of an inner diameter (d1) and an outer diameter (d2) of the particles (b-2) is 0.5-0.999.SELECTED DRAWING: Figure 1 【課題】 本発明の目的は、無機粒子を有する多孔層と多孔基材層との結着性、及び電解液透過性に優れ、熱収縮率が低い二次電池用セパレータとその用途、該二次電池用セパレータに好適に使用できる二次電池セパレータ用樹脂粒子、及び二次電池セパレータ用スラリー組成物を提供する。【解決方法】 多孔基材層（Ａ）と、無機粒子（ｂ－１）及び樹脂粒子（ｂ－２）を含む多孔層（Ｂ）を有する二次電池用セパレータであって、前記粒子（ｂ－２）が有機樹脂からなる外殻部と、前記外殻部に囲まれた空間部とから構成され、前記粒子（ｂ－２）の体積基準の累積１０％粒子径（Ａ１０）と体積基準の累積５０％粒子径（Ａ５０）の比（Ａ５０／Ａ１０）が１．１以上であり、前記粒子（ｂ－２）の内径（ｄ１）と外径（ｄ２）の比（ｄ１／ｄ２）が０．５～０．９９９である、二次電池用セパレータ。【選択図】 図１