All-solid-state secondary battery using polymer binder made from unsaturated carboxylic acid ester not having hydroxyl groups and compound having a teriary amine group and method of manufacturing same

Abstract

A binder for an all-solid-state secondary battery that can control a decrease in ionic conductivity, is excellent in binding properties and oxidation resistance, and can realize favorable cycle life characteristics even under a high voltage; and a binder composition for an all-solid-state secondary battery containing the binder. A binder for an all-solid-state secondary battery includes a polymer (A) which includes a repeating unit (a1) derived from an unsaturated carboxylic acid ester (excluding an unsaturated carboxylic acid ester having a hydroxyl group) and a repeating unit (a2) derived from a compound having a tertiary amino group, a weight-average molecular weight (Mw) of the polymer (A) being from 250000 to 3000000, and an endothermic peak being observed at −10° C. or lower when differential scanning calorimetry (DSC) is performed on the polymer (A) in accordance with JIS K 7121.

Dependencies are inferred from the claim text.