▎ 摘　　要

NOVELTY - Processing a porous silicon electrode composite material, comprises (1) taking porous silicon powder and deionized water, performing ultrasonic dispersion to obtain porous silicon dispersion liquid, adding a poly diallyl dimethyl ammonium chloride solution, performing vacuum drying to obtain pretreated silicon powder, taking graphene oxide and deionized water, and performing ultrasonic dispersion to obtain a graphene dispersion liquid, adding the pretreated silicon powder, performing ultrasonic dispersion, collecting a product, and performing vacuum drying to obtain graphene composite silicon powder, (2) taking graphene composite silicon powder and deionized water, performing ultrasonic dispersion, adding ammonia water, resorcinol and formaldehyde, reacting, adding a hyperbranched polyimide solution, adding acetone, centrifuging, collecting a product, washing with deionized water and absolute ethyl alcohol, drying in vacuum, and calcining to obtain carbon-coated porous silicon USE - The method is useful for processing a porous silicon electrode composite material. ADVANTAGE - The method: improve the circulation stability and capacity retention rate of the porous silicon; can provide expansion space for lithiation of silicon powder, does not damage the outer carbon shell. DETAILED DESCRIPTION - Processing a porous silicon electrode composite material, comprises (1) taking porous silicon powder and deionized water, performing ultrasonic dispersion to obtain porous silicon dispersion liquid, adding a poly diallyl dimethyl ammonium chloride solution, stirring for 20-30 minutes, washing and collecting a product, and performing vacuum drying to obtain pretreated silicon powder, taking graphene oxide and deionized water, and performing ultrasonic dispersion to obtain a graphene dispersion liquid, adding the pretreated silicon powder into the graphene dispersion liquid, performing ultrasonic dispersion, allowing to stand, collecting a product, and performing vacuum drying to obtain graphene composite silicon powder, (2) taking graphene composite silicon powder and deionized water, performing ultrasonic dispersion, adding ammonia water, resorcinol and formaldehyde, reacting for 30-40 minutes, adding a hyperbranched polyimide solution, continuing to reacting for 20-30 minutes, adding acetone, allowing to stand for 30-40 minutes, centrifuging, collecting a product, sequentially washing with deionized water and absolute ethyl alcohol, drying in vacuum, transferring to 700-710℃ after drying, and calcining for 3-3.5 hours to obtain carbon-coated porous silicon, (3) mixing polydopamine solution and polyacrylic acid gel, stirring for 10-12 hours, adding hyperbranched polyimide solution, and continuously stirring for 20-24 hours to obtain a binder, mixing the binder, carbon-coated porous silicon and conductive agent, uniformly stirring, and adding NMP to adjust the viscosity to obtain coating slurry, and uniformly coating the coating slurry on a current collector copper foil, carrying out vacuum drying for 10-12 hours at the temperature of 60℃, cutting into wafers after cooling, and carrying out vacuum drying for 2-3 hours at the temperature of 110-120℃ to obtain the final product. An INDEPENDENT CLAIM is also included for a porous silicon electrode composite material.