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1. (WO2016051713) COMPOSITION FOR POROUS MEMBRANE FOR LITHIUM ION SECONDARY BATTERIES, POROUS MEMBRANE FOR LITHIUM ION SECONDARY BATTERIES, AND LITHIUM ION SECONDARY BATTERY

Pub. No.:    WO/2016/051713    International Application No.:    PCT/JP2015/004769
Publication Date: Fri Apr 08 01:59:59 CEST 2016 International Filing Date: Fri Sep 18 01:59:59 CEST 2015
IPC: H01M 2/16
H01M 4/13
Applicants: ZEON CORPORATION
日本ゼオン株式会社
Inventors: TOYODA, Yujiro
豊田 裕次郎
TAKAMATSU, Hiromi
高松 裕美
Title: COMPOSITION FOR POROUS MEMBRANE FOR LITHIUM ION SECONDARY BATTERIES, POROUS MEMBRANE FOR LITHIUM ION SECONDARY BATTERIES, AND LITHIUM ION SECONDARY BATTERY
Abstract:
The purpose of the present invention is to provide a technique for capturing, within a secondary battery, transition metal ions such as cobalt ions eluted from a positive electrode active material, thereby preventing deposition of the transition metal at a negative electrode. The present invention provides a composition for a porous membrane for lithium ion secondary batteries, which contains non-conductive particles and a binder that contains a polymer A containing more than 85% by mass of an aliphatic conjugated diene monomer unit and a polymer B containing 60% by mass or more of a (meth)acrylic acid ester monomer unit, with the ratio of the content of the polymer A to the content of the polymer B being from 0.2 to 9.0 (inclusive) on a mass basis.