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1. (WO2017188055) AQUEOUS RESIN COMPOSITION FOR LITHIUM ION SECONDARY BATTERY BINDERS AND SEPARATOR FOR LITHIUM ION SECONDARY BATTERIES

Pub. No.:    WO/2017/188055    International Application No.:    PCT/JP2017/015533
Publication Date: Fri Nov 03 00:59:59 CET 2017 International Filing Date: Wed Apr 19 01:59:59 CEST 2017
IPC: H01M 2/16
Applicants: DIC CORPORATION
DIC株式会社
Inventors: KAJIKAWA Masahiro
梶川 正浩
Title: AQUEOUS RESIN COMPOSITION FOR LITHIUM ION SECONDARY BATTERY BINDERS AND SEPARATOR FOR LITHIUM ION SECONDARY BATTERIES
Abstract:
An aqueous resin composition for lithium ion secondary battery binders, which contains core-shell particles (A), each of which has a core part formed of a polymer (a1) and a shell part formed of a polymer (a2), and an aqueous medium (B). This aqueous resin composition for lithium ion secondary battery binders is characterized in that: the monomer starting materials of the polymer (a1) contain 45-95.5% by mass of methyl methacrylate and 4-40% by mass of a (meth)acrylate having an alkyl group with 4 or more carbon atoms; and the monomer starting materials of the polymer (a2) contain 60% by mass or more of styrene. Since this aqueous resin composition has excellent film forming properties at low temperatures and excellent adhesion to an electrode and to a porous body that constitutes a separator, this aqueous resin composition is suitable for use as a binder.