▎ 摘　　要

NOVELTY - Preparation method of composite phase change material involves dispersing ferric chloride hexahydrate and trimellitic acid in water, stirring uniformly to obtain a mixed solution, placing the mixed solution in a reaction kettle for hydrothermal reaction to obtain a solid product, and subjecting the solid product to carbonization treatment to obtain carbide powder. Preparing graphene oxide into an aqueous dispersion, adding the carbide powder and cross-linking agent, hydrothermally synthesized and freeze-drying to obtain an aerogel carrier. Immersing aerogel carrier is vacuum in the molten lauric acid, and taking out the aerogel carrier, and heating the non-adsorbed lauric acid to remove the composite phase change material. USE - Composite phase change material used in the thermal management of lithium batteries (claimed). ADVANTAGE - Lauric acid with the melting point temperature of 46 degrees Celsius and large heat storage capacity is used as a phase-change material, composite phase-change material with high-efficiency energy storage and conversion is constructed on the basis, battery waste heat is fully absorbed for cooling in a high-temperature environment, applying small voltage to the phase-change material for heating the battery in a low-temperature environment, and applying the same material is successfully to realize the cooling and heating of the lithium battery. The organic metal framework material-carbide/graphene oxide hybrid aerogel is adopted to load lauric acid, and the synergistic effect between the organic metal framework material-carbide and graphene oxide is utilized to further improve the electric/thermal conductivity and the phase-change material loading rate while the respective advantages of the organic metal framework material-carbide and graphene oxide are applied, so that the lauric acid@organic metal framework material-carbide/graphene oxide composite phase-change material with high stability, enhanced electric/thermal conductivity and high loading rate is prepared. Organic metal framework material-carbide in the formed hybrid aerogel is uniformly distributed in graphene oxide by adopting hydrothermal synthesis and freeze drying, and the saturated loaded composite phase change material is further prepared by adopting a vacuum impregnation method.