High-temperature thermochemical heat storage material with high energy storage density and high cycle stability and preparation method thereof

The invention relates to a high-temperature thermochemical heat storage material with high energy storage density and high cycle stability and a preparation method thereof, and the high-temperature thermochemical heat storage material comprises the following components: CaCO3/CaO used as a heat storage and release material, TiO2 used as an anti-sintering modifier, and MgCl2 used as an enhanced mass transfer modifier. The preparation method comprises the following steps: fully mixing nano-scale CaCO3, organic acid, tetrabutyl titanate and anhydrous MgCl2, dispersing, hydrolyzing, stirring, drying by distillation, and carrying out high-temperature calcination treatment to obtain the modified calcium-based material. The modified calcium-based material prepared by the method has high energy storage density and high cycle stability, is small in average grain size, has relatively high specific surface area and porosity, is developed in pore structure, provides a good mass transfer channel for diffusion and absorpti