CERAMIC COMPOSITE PARTICLES AND SECONDARY BATTERY USING SAME

A ceramic composite particle includes a ceramic particle (141) and a coating layer (142) that covers at least a part of a surface of the ceramic particle and contains two or more phases. The coating layer contains a first phase (142a) composed of an oxide-based ion conductor and a second phase (142b) composed of an amorphous-phase-containing ion conductor containing an amorphous phase. The first phase has higher ionic conductivity than that of the second phase. The second phase has a lower Young's modulus than that of the first phase.