▎ 摘　　要

NOVELTY - Method for preparing zinc oxide coated silicon negative electrode material, involves (a) adding conductive agent graphene, binder and silicon nanoparticles to ball mill, performing ball milling treatment, adding conductive agent graphene, binder and silicon nanoparticles to vacuum stirrer, injecting deionized water to stirrer, and stirring, (b) coating obtained dispersed uniform slurry on surface of current collector, placing uniformly coated aluminum foil in vacuum drying box, and drying, (c) adding zinc powder to smelting apparatus, activating, and performing melt process to obtain zinc in molten state, (d) uniformly mixing graphene, silicon nanoparticle coated porous aluminum foil negative electrode material and zinc in molten state, and after coating porous aluminum foil negative electrode material on graphene and silicon nanoparticles, adding the mixture to air condition for performing calcination treatment. USE - Method for preparing zinc oxide coated silicon negative electrode material. ADVANTAGE - The method is simple, easy to implement, easy to operate and economical, prevents the volume expansion and contraction of silicon during charge-discharge reaction process, inhibits side reactions of negative electrode material, improves the stability of the electrode cycle and cycle efficiency, and ensures strong electrical conductivity. DETAILED DESCRIPTION - Method for preparing zinc oxide coated silicon negative electrode material, involves (a) adding conductive agent graphene, binder and silicon nanoparticles to ball mill, performing ball milling treatment, adding conductive agent graphene, binder and silicon nanoparticles to vacuum stirrer, injecting deionized water to stirrer, and uniformly stirring the mixture at 800-1200 rpm for 2-3 hours to obtain uniformly dispersed slurry, (b) coating obtained dispersed uniform slurry on surface of current collector, where the current collector is porous aluminum foil, the thickness of the coating is 0.2-1 mu m, placing uniformly coated aluminum foil in vacuum drying box, and drying at 100-120 degrees C for 3-6 hours to obtain graphene and silicon nanoparticles for coating the porous aluminum foil negative electrode material, (c) adding zinc powder to smelting apparatus, activating at 500 degrees C under pressure of 6 MPa for 5 hours, and after completing activation process, and performing melt process to obtain zinc in molten state, (d) uniformly mixing graphene, silicon nanoparticle coated porous aluminum foil negative electrode material and zinc in molten state, and after coating porous aluminum foil negative electrode material on graphene and silicon nanoparticles, adding the mixture to air condition for performing calcination treatment to obtain zinc oxide coated silicon negative electrode material, where the binder in step (a) is carboxymethyl cellulose, and the mass ratio of conductive agent graphene, binder and silicon nanoparticle is 2:3:15.