▎ 摘　　要

NOVELTY - Composite current collector comprises a base material layer located at the center of the center, and starting outward from the upper and lower surfaces of the base materials layer. The material of the first metal layer is metal chromium chromium, nickel or titanium, or chromium alloy, nickel alloy, titanium alloy, copper, aluminum, nickel, titanium, niobium or iron, and the material of a non-metal layer is sheet graphite carbon nanotubes, acetylene black, graphene, carbon fiber, and carbon fiber. The transition layer is a mixture of the second metal layer material and the non-metallic layer material. USE - Composite current collector for negative electrode of lithium ion battery used in electronic communication, traffic and energy storage fields. Can also be used in lithium ion batteries used in electric vehicles, hybrid vehicles, plug-in hybrid electric vehicles and hydrogen-powered vehicles. ADVANTAGE - The composite current collector has stable material performance, good corrosion resistance, does not react with the electrolyte solution, has low cost, is easy to obtain, and is suitable for mass production, has high corrosion resistance and high interface bonding strength and preparation method, and solves the problem that the bonding force between each layer of the composite structure in the existing technology is bad and the corrosion resistance of insufficient. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a preparation method of composite current collector for lithium ion battery negative electrode. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of a composite current collector. 101Substrate 101aSubstrate layer upper surface 101bSubstrate layer lower surface 102aFirst upper metal layer 102bFirst lower metal layer 103aSecond upper metal layer 103bSecond lower metal layer 104aUpper transition layer