Calcium-based thermochemical heat storage material and preparation method thereof

The invention discloses a calcium-based thermochemical heat storage material and a preparation method thereof, belongs to the technical field of thermochemical heat storage materials, and overcomes the defects that in the prior art, the reaction peak temperature of an inorganic hydroxide heat storage and release material system is high, the total cost of the system is high, and large-scale application is limited. The preparation method of the calcium-based thermochemical heat storage material comprises the following steps: mixing soluble calcium salt with a solvent A to prepare a solution A; mixing a precipitant with a solvent B to prepare a solution B; the precipitant comprises a soluble compound containing OH or CO3 < 2->; dispersing a modifier C3N4 into the solution A or the solution B, mixing the solution A and the solution B, reacting, and carrying out solid-liquid separation to obtain a solid product; and calcining the solid product to obtain the modified calcium-based material. According to the inv