▎ 摘　　要

NOVELTY - High-efficiency heat storage phase-change composite material comprises lithium-based ternary eutectic molten salt and 0.2-1.5 wt.% hydroxylated graphene. The lithium-based ternary eutectic molten salt is compounded from lithium-based fluoride salt, chloride salt and nitrate. USE - High-efficiency heat storage phase-change composite material. ADVANTAGE - The high-efficiency heat storage phase-change composite material increases the graphene sheet interlayer distance, improves the agglomeration graphene in the molten salt and graphene uniformity in the composite material, problem that the current phase change material cannot give attention to high heat storage and high heat conduction performance, realizes the fast charging and discharging function of phase change material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a high-efficiency heat storage phase-change composite material, which involves: a. mixing lithium-based fluoride salt, chloride salt and nitrate by mechanical ball milling to obtain lithium-based ternary eutectic molten salt; b. dispersing the graphene nanosheets in water to obtain a graphene dispersion, and then adjusting the pH of the dispersion to 3-4; c. adding a strong oxidant into the graphene dispersion, ultrasonically dispersing and modifying, centrifugally filtering product and drying to obtain hydroxylated graphene; and d. dispersing the hydroxylated graphene in the aqueous alcohol solution, preparing a hydroxylated graphene alcohol-water mixture, then adding the lithium-based ternary eutectic molten salt, ultrasonically dispersing, placing in a drying oven for drying, cooling and then grinding into powder.