▎ 摘　　要

NOVELTY - Preparation of multilayer phase-change composite material involves disperse ferric chloride hexahydrate and trimellitic acid in water, stirring to obtain mixed solution, hydrothermally reacting to obtain solid product, carbonizing to obtain metal organic framework-based carbide, preparing aqueous dispersion of graphene oxide, adding metal organic framework-based carbide and crosslinking agent, reacting and freeze-drying to obtain aerogel carrier, heating calcium chloride hexahydrate and adding nucleating agent to obtain variety of phase-change materials with different freezing points, immersing aerogel carrier in the multiple phase-change materials, leaving still, heating to obtain multiple types of calcium chloride hexahydrate with different freezing points-doped metal organic framework-based carbide/graphene aerogel phase change material, and combining the calcium chloride hexahydrate-doped metal organic framework-based carbide/graphene aerogel phase change material with binder. USE - Preparation of multilayer phase-change composite material used in thermal management of lithium battery (all claimed). ADVANTAGE - The prepared multilayer phase-change composite material can efficiently store battery waste heat, release the stored heat in controlled manner when the ambient temperature decreases, and heat the battery to improve its low-temperature resistance performance. DETAILED DESCRIPTION - Preparation of multilayer phase-change composite material involves (s1) disperse ferric chloride hexahydrate and trimellitic acid in water, uniformly stirring to obtain mixed solution, adding mixed solution to reaction kettle, hydrothermally reacting to obtain solid product, carbonizing the solid product to obtain metal organic framework-based carbide, (s2) preparing aqueous dispersion of graphene oxide, adding the metal organic framework-based carbide and crosslinking agent, hydrothermally reacting and freeze-drying to obtain aerogel carrier, (s3) heating and melting calcium chloride hexahydrate and adding nucleating agent to obtain variety of phase-change materials with different freezing points, (s4) immersing aerogel carrier in the multiple phase-change materials with different freezing points, leaving still, heating to remove the non-adsorbed calcium chloride hexahydrate to obtain multiple types of calcium chloride hexahydrate with different freezing points-doped metal organic framework-based carbide/graphene aerogel phase change material, and (s5) combining the calcium chloride hexahydrate-doped metal organic framework-based carbide/graphene aerogel phase change material with multiple of different freezing points with binder. An INDEPENDENT CLAIM is included for multilayer phase change composite material, which is prepared from the above preparation process