Positive electrode active material layer, electrode, and solid-state battery

Abstract

A positive electrode active material layer forming a positive electrode adapted to suppress interfacial resistance between a current collector and an electrode active material, an electrode containing the positive electrode active material layer, and a semi-solid-state or an all-solid-state battery including the electrode. A positive electrode active material layer including a positive electrode active material, a solid electrolyte, and a binder, the binder being the following polymer or polymer, is used. Polymer: a homopolymer of vinylidene fluoride having an intrinsic viscosity of 3.5 dL/g or less. Polymer: a vinylidene fluoride copolymer containing a constituent unit derived from vinylidene fluoride and a constituent unit derived from hexafluoropropylene, having an intrinsic viscosity of 1.3 dL/g or greater and 4.0 dL/g or less, and containing 8.0 mass % or less of the constituent unit derived from hexafluoropropylene with respect to 100.0 mass % of all constituent units of the vinylidene fluoride copolymer.

Dependencies are inferred from the claim text.