**2. Preparation process and thermal properties of ceramic-based CPCMs**

Medium-high temperature ceramic-based composite phase change materials are usually composed of inorganic salts with a porous skeleton. Inorganic salts are embedded into porous ceramic skeletons by an efficient method for the preparation of shape-stabled CPCMs. It solves the problems of poor thermal conductivity, substrate corrosion, and material encapsulation in inorganic salt-based PCMs, and its sensiblelatent heat gives it a high heat capacity. At present, the preparation of medium-high temperature ceramic-based shaped CPCMs is mainly divided into three categories: mixing-impregnation method and cold pressing-sintering method.
