National Institute of Advanced Industrial Science and Technology

Yuso Ishida

Junji Akimoto

Kunimitsu Kataoka

Tomoki Ariga

Provided is a novel solid electrolyte material of high density and high ionic conductivity, and an all-solid-state lithium ion secondary battery that utilizes the solid electrolyte material. The solid electrolyte material has a chemical composition represented by LiGaLaZrO(0.08≤x<0.5), has a relative density of 99% or higher, belongs to space group I-, in the cubic system, and has a garnet-type structure. The lithium ion conductivity of the solid electrolyte material is 2.0×10S/cm or higher. The solid electrolyte material has a lattice constant a such that 1.29 nm≤a≤1.30 nm, and lithium ions occupy thesite, thesite and two types ofsite, and gallium occupies thesite and thesite, in the crystal structure. The all-solid-state lithium ion secondary battery has a positive electrode, a negative electrode, and a solid electrolyte. The solid electrolyte is made up of the solid electrolyte material of the present invention.

Growing community of inventors

Tokyo, Japan

Yuso Ishida