Solid-state secondary battery

Abstract

Provided is a solid-state secondary battery having an intermediate layer allowing rapid charging and providing desirable charge-discharge efficiency. A solid-state secondary battery includes: a positive electrode layer; a negative electrode layer including at least a negative electrode current collector; a solid electrolyte layer containing a solid electrolyte material; an intermediate layer provided between the negative electrode layer and the solid electrolyte layer, and a buffer material that constrains an electrode assembly formed by joining the positive electrode layer, the solid electrolyte layer, the intermediate layer, and the negative electrode layer, in which the buffer material has a 25% compression load of more than 0.5 MPa and an elongation of less than 100%.

Dependencies are inferred from the claim text.