CHEMICAL HEAT STORAGE MATERIAL, MANUFACTURING METHOD THEREFOR AND CHEMICAL HEAT STORAGE STRUCTURE

摘要

A novel chemical heat storage material which can further improve the matching with a heat medium storage material and the efficiency of a chemical heat storage system is provided. The chemical heat storage material according to the present invention is a chemical heat storage material that becomes exothermic or endothermic due to absorption or release of a heat medium, and is characterized in that it comprises a double metal salt (MX n , n: average valence number of M) that is a metal halide comprising a metal element (M) and a halogen element (X), and at least one of the metal element and the halogen element comprises two or more types of elements. The coordination number of the heat medium can change by at least 4 or more due to a heat medium absorption/release reaction that absorbs or releases the heat medium. Preferable examples of the chemical heat storage material according to the present invention include Ca 0.5 Sr 0.5 Cl 2 which is a double alkaline-earth metal halide. The present invention can be perceived not only as the chemical heat storage material but also as a manufacturing method for the same and a chemical heat storage structure that uses the same.