MATÉRIAU DE STOCKAGE DE CHALEUR, PROCÉDÉ DE PRODUCTION DE MATÉRIAU DE STOCKAGE DE CHALEUR ET POMPE À CHALEUR CHIMIQUE

[OBJECT]To provide a heat storage material having a high hydration capacity, which does not readily deliquesce, and the hydration capacity of which can be effectively used. Furthermore, the present disclosure aims to provide a method for the production of such a heat storage material, and a chemical heat pump and heat storage method using such a heat storage material.[SOLVING MEANS]The heat storage material of the present disclosure is a composite metal halide including a monovalent metal, a divalent metal, and a halogen. Furthermore, the method for the production of the heat storage material of the present disclosure includes preparing a mixture in which a monovalent metal halide and a divalent metal halide hydrate are mixed, and generating the composite metal halide by subjecting the mixture to a heat treatment. Furthermore, the chemical heat pump of the present disclosure includes a water storage unit 10 for storing water as a working medium, a heat storage material retention unit 20 for retaining the heat storage material of the present disclosure, and a water vapor flow path 30 for allowing water to flow vapor between the water storage unit and the heat storage material retention unit.