▎ 摘　　要

NOVELTY - Artificial graphite/graphene composite thermally conductive film comprises a flexible substrate layer that is carbonized and graphitized as a whole, adhesive-containing graphene transition layer and graphene thermal conductivity layer, where the adhesive in the flexible substrate layer and the adhesive-containing graphene transition layer forms artificial graphite during the graphitization process. USE - As artificial graphite/graphene composite thermally conductive film. ADVANTAGE - The artificial graphite/graphene composite thermally conductive film has simple preparation process with a thickness of up to 200 mu m, and lateral thermal conductivity of more than 1000 W/mK. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the artificial graphite/graphene composite thermally conductive film, which involves (i) dispersing graphene and adhesive in a predetermined weight ratio in water, and vacuum degassing to obtain the graphene transition layer slurry, (ii) dispersing graphene in water, and vacuum degassing to obtain the graphene thermally conductive slurry, (iii) roughening the flexible substrate to obtain a roughened flexible substrate, (iv) coating the graphene transition layer slurry on the roughened flexible substrate, and drying to obtain the flexible substrate-graphene transition layer film material, where the thickness of the graphene transition layer after extension is 10-100 mu m, and the thickness is required to be less than or equal to half of the thickness of the flexible substrate before roughening, (v) coating the graphene heat-conducting slurry on the flexible substrate-graphene transition layer film material, and drying to obtain a composite film precursor containing a graphene heat-conducting layer, where the sum of the thickness of the graphene transition layer and the post-delayed thickness of the graphene thermally conductive lamination is 10-100 mu m, and the total thickness is required to be less than or equal to half the thickness of the flexible substrate before roughening, (vi) carburizing and graphitizing the composite film precursor to obtain a composite thermally conductive film, and (vii) calendering the composite thermally conductive film to obtain the artificial graphite/graphene composite thermally conductive film.