ACTIVE MATERIAL COMPOSITE PARTICLE, ELECTRODE ACTIVE MATERIAL LAYER, AND ALL SOLID LITHIUM BATTERY

摘要

An object of the present invention is to provide an active material composite particle (10) capable of avoiding a reaction with a sulfide solid electrolyte material at high temperature. The object is attained by providing an active material composite particle (10) comprising an oxide active material (1) of rock salt bed type and a coat layer (2) containing lithium niobate formed on a surface of the oxide active material (1), a thickness of the coat layer (2)being in the range of 25 nm to 94 nm.