Binder for electrode for lithium ion secondary battery, and utilization thereof

Abstract

A polymer binder for an electrode is provided, which is comprised of a polymer comprising (a) structural units derived from a monofunctional ethylenically unsaturated carboxylic acid ester monomer, (b) structural units derived from an ethylenically unsaturated carboxylic acid monomer, and (c) structural units derived from a methacrylonitrile monomer; the ratio of [(a)+(c)]/(b) being 99.9 to 1.5 by weight; the sum of (a)+(b)+(c) being at least 70 wt. % based on the total structural units of the polymer; and the polymer being substantially free from structural units derived from an ethylenically hydrocarbon monomer and structural units derived from a diene monomer. The binder exhibits enhanced electrochemical stability and is useful for making an electrode of a lithium ion secondary battery.

Dependencies are inferred from the claim text.