▎ 摘　　要

NOVELTY - Preparing phase-change energy storage composite material with fast response and high heat storage based on liquid metal involves placing graphene slurry in a planetary stirrer, stirring at a speed of 2000-4500 revolutions per minute (r/min) for 1 hour to enable the graphene slurry to be in a nano-dispersed state, spraying the graphene slurry layer by layer on a metal bottom plate which moves at a constant speed in the horizontal direction under the condition of-10 to -40℃ by a three-dimensional (3D) printing technology. USE - Method for preparing phase-change energy storage composite material with fast response and high heat storage based on liquid metal. ADVANTAGE - The prepared graphene/liquid metal phase-change energy storage material has quick response and high heat storage, shortened response time by 2/3 compared with that of the traditional commercial material, and high phase-change enthalpy value as 396 kilojoule/l. DETAILED DESCRIPTION - Preparing phase-change energy storage composite material with fast response and high heat storage based on liquid metal involves placing graphene slurry in a planetary stirrer, stirring at a speed of 2000-4500 revolutions per minute (r/min) for 1 hour to enable the graphene slurry to be in a nano-dispersed state, spraying the graphene slurry layer by layer on a metal bottom plate which moves at a constant speed in the horizontal direction under the condition of-10 to -40℃ by a three-dimensional (3D) printing technology, controlling the ratio of the movement speed of the bottom plate and the spraying speed to generate a shearing force in the horizontal direction, where the shearing force enables the graphene to be directionally arranged along the horizontal direction, freezing quickly slurry sprayed to the bottom plate into a solid at a low temperature, fixing directionally arranged structure to obtain graphene/ice crystal composite solid with high directional arrangement, placing the highly-oriented graphene/ice crystal composite solid on a porous grid of 100 meshes, performing rapid freeze drying on the graphene/ice crystal composite solid by arranging high-power radiation plate around the graphene/ice crystal composite solid to remove water and keep the original skeleton structure to obtain a stable highly-oriented graphene skeleton, placing the prepared graphene skeleton in a temperature-controllable double-roller rolling device, densifying the graphene skeleton by the double-roller rolling device at a certain temperature, orienting the graphene nanosheets by controlling the ratio of the rolling speed to the feeding speed in the rolling process to obtain a highly oriented graphene skeleton, putting the obtained graphene skeleton into a graphitization furnace, performing graphitization treatment for 1-5 hours in an inert gas atmosphere, removing an internal polymeric dispersant, repairing the defects of graphene nano sheet, where the graphitization treatment temperature is 2700-3000℃, metallizing the surface of the graphitized high-orientation graphene skeleton to improve the wettability between liquid metal and graphene, placing the graphene skeleton in liquid metal, heating in an oven with the vacuum degree of-0.1 megapascal to melt the liquid metal, pouring the molten liquid metal into the graphene skeleton under the action of vacuum negative pressure, cooling naturally to obtain a graphene/liquid metal phase-change energy storage material, placing the obtained graphene/liquid metal phase change energy storage material in a double-roller rolling device capable of controlling the temperature, densifying the graphene/liquid metal phase change energy storage material through double-roller rolling equipment with the same temperature and the roller speed of 5-200 mm/minutes when the temperature is raised to be close to a phase change point, so that internal gaps of the composite material are reduced, interface thermal resistance is reduced, thermal conductivity is improved, and obtaining a graphene/liquid metal phase change energy storage composite material with fast response and high heat storage. An INDEPENDENT CLAIM is included for a phase-change energy storage composite material with fast response and high heat storage based on liquid metal is prepared by preparation method.