▎ 摘　　要

NOVELTY - The utility model claims a graphene modified diaphragm structure of high-capacity lithium battery, belonging to the battery technical preparation field, provided with an upper graphene modified polyolefin micro-porous polymer film, the lower surface of the graphene modified polyolefin micro-porous polymer film is sprayed or coated with porous graphene polymer film; the lower surface of the porous graphene polymer film is sprayed or coated with a porous ceramic layer, the lower surface of the porous ceramic layer is sprayed or coated with a lower graphene modified polyolefin micro-porous polymer film; further provided with gap penetrating the porous graphene polymer film and a porous ceramic layer. the porous ceramic layer as the substrate, the graphene and polymer are combined, on the basis of not affecting the polymer insulation, increase diaphragm strength, the heat generated in the battery working can be uniformly dispersed and distributed. and a porous ceramic layer is wavy line structure, under the condition of not influencing the length of the condition, can increase the gap amount of the same linear length.