▎ 摘　　要

NOVELTY - The method involves mixing polypropylene resin or PET resin with multi-layer graphene surfactant to obtain composite material, melting, extrusion, casting and casting process to form sheet, forming composite base film by a bidirectional stretching process of the sheet, and water plating process. The surface of the composite substrate film is formed with metal layer (1). USE - Method for preparing a composite current collector for lithium battery cathode used in lithium ion battery. Can also be used in electric vehicle, hybrid vehicle, plug-in hybrid electric vehicle (PHEV), hydrogen-powered vehicle (HEV), etc. ADVANTAGE - The method enables separating and orienting the layers of the multilayer, graphene as to improve the strength of the composite film, elongation at break and conductive performance after bidirectional stretching composite film prepared by the casting method, after the graphene stretching process, thus improving the strength and uniformity of the metal layer on two sides of the base film, and hence improving the production efficiency, production efficiency and production cost of the lithium battery cathode. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the current collector. 1Metal layer 3Graphene 4Macromolecule film