▎ 摘　　要

NOVELTY - Lithium-ion battery cathode pole piece comprises porous foil, lithium supplement material coating, silicon series negative electrode material coating and graphite coating, where, the porosity of the porous foil is 20-50%, and the pore diameter is 0.1-4 mm, the lithium-supplementing material layer is attached to both sides of the porous foil and filled in the pores of the porous foil, the silicon-based cathode material coating is attached to the outside of the lithium-supplementing material layer and the graphite coating is attached to the outside of the silicon-based cathode material coating. USE - Used as lithium-ion battery cathode pole piece DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparing lithium-ion battery negative pole piece comprising mixing the metal lithium powder, the conductive agent and the binder uniformly in proportion to prepare the lithium supplement material, coating the lithium-replenishing material on the porous foil and filling the pores with the porous foil to obtain a lithium-replenishing material layer, mixing the silicon-based cathode material, conductive agent and binder uniformly in proportion, and coating the obtained slurry on the lithium-replenishing material layer to obtain a silicon-based negative electrode material coating, mixing graphite, conductive agent and binder in a mass ratio of 84-98:1-6:1-10, and coating the obtained graphite slurry on the silicon-based cathode material coating to obtain graphite coating, the binder in the coating is a combination of styrene-butadiene rubber, polyacrylic acid, polyacrylonitrile, polymethacrylic acid, polyacrylate and sodium carboxymethylcellulose or polyvinylidene fluoride; and lithium ion battery comprises cathode sheet. DESCRIPTION OF DRAWING(S) - The drawing shows a cutaway view for preparing the lithium electrode sheet cathode the cutaway view structure. 1Porous foil material 2Coating lithium material 3Silicon-cathode material coating 4Graphite coating