ACTIVE MATERIAL PARTICLE FOR LITHIUM ION SECONDARY BATTERY, AND LITHIUM ION SECONDARY BATTERY USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a safe and long-life all-solid lithium ion secondary battery arranged to maintain the lithium ion conductivity and to suppress the decline of performance attributed to the repetition of charge and discharge cycles.SOLUTION: The lithium ion secondary battery comprises: a positive electrode; a negative electrode; and a solid electrolyte. At least one of a positive electrode active material and a negative electrode active material is covered with a coating layer made of glass containing vanadium and at least one of phosphorus and tellurium. The positive electrode active material particle or negative electrode active material particle comprises: an active material; and a coating layer covering the surface of the active material. The coating layer is made of glass containing vanadium and at least one of phosphorus and tellurium.