▎ 摘　　要

NOVELTY - Preparing graphene composite solid-solid phase change material comprises (i) preparing graphene powder, where the sheet diameter of the graphene powder is 5-10 mu m, (ii) heating at least two of pentaerythritol, trimethylolethane, neopentyl glycol, 2-amino-2-methyl-1,3-propanediol, and tris(hydroxymethyl)aminomethane to molten state; adding 0.1-10 wt.% graphene powder, mixing and stirring uniformly to make graphene polyol composite slurry, and (iii) extruding the molten graphene polyol composite slurry to form graphene composite solid-solid phase change material sheet with thickness of 2-10 mm. USE - The method is useful for preparing graphene composite solid-solid phase change material.