COMPOSITE ACTIVE MATERIAL, MANUFACTURING METHOD FOR COMPOSITE ACTIVE MATERIAL, AND LITHIUM SECONDARY BATTERY INCLUDING COMPOSITE ACTIVE MATERIAL

摘要

A composite active material including composite particles (3) and a sulfide-based solid electrolyte (4) is proposed. The composite particles (3) contain active material particles (1) and an oxide-based solid electrolyte (2). The active material particles (1) contain at least any one of a cobalt element, a nickel element and a manganese element and further contain a lithium element and an oxygen element. The oxide-based solid electrolyte (2) coats all or part of a surface of each of the active material particles (1). The sulfide-based solid electrolyte (4) further coats 76.0% or more of a surface of each of the composite particles.