▎ 摘　　要

NOVELTY - Preparing spiral silicon-graphene composite cathode involves mixing hydroxypropyl methylcellulose, copper nanowire, propylene glycol, surfactant antifoaming agent, configuring as slurry in deionized water, using flexible film containing nickel-chromium alloy coating as substrate, pressing the substrate, fixing on the screen printing machine, printing the slurry on the surface of the flexible substrate with specific pattern, performing vacuum drying to obtain the flexible substrate loaded with copper nanowire, fixing the obtained flexible substrate on the vacuum deposition chamber, using methane and hydrogen as gas source, depositing graphene under the catalysis of copper nanowire to obtain flexible substrate depositing graphene strip, adding the nanosilicon powder into de-ionized water, and adding a little dispersant and thickening agent for ultrasonic treatment to obtain nanosilicon dispersed slurry. USE - Method for preparing spiral silicon-graphene composite cathode used for lithium battery (claimed). ADVANTAGE - The cathode material is provided with a spiral graphene frame, providing a larger expansion space for silicon volume change in the charging and discharging process, ensuring the structure stability of the cathode material, improving the circulation performance of the cathode material. DETAILED DESCRIPTION - Preparing spiral silicon-graphene composite cathode involves mixing hydroxypropyl methylcellulose, copper nanowire, propylene glycol, surfactant antifoaming agent, configuring as slurry in deionized water, using flexible film containing nickel-chromium alloy coating as substrate, pressing the substrate, fixing on the screen printing machine, printing the slurry on the surface of the flexible substrate with specific pattern, performing vacuum drying to obtain the flexible substrate loaded with copper nanowire, fixing the obtained flexible substrate on the vacuum deposition chamber, using methane and hydrogen as gas source, depositing graphene under the catalysis of copper nanowire to obtain flexible substrate depositing graphene strip, adding the nanosilicon powder into de-ionized water, adding a little dispersant and thickening agent for ultrasonic treatment to obtain nanosilicon dispersed slurry, coating the obtained slurry on the obtained flexible substrate surface with graphene strip, performing vacuum drying the obtained flexible substrate, thermosetting, twisting the flexible substrate with specific spiral structure after fixing the twisted substrate, using ferric trichloride corrosive liquid to corrode after the corrosion is finished, unfolding the flexible substrate, adding deionized aqueous solution for ultrasonic dispersion, taking out the flexible substrate, filtering, drying to obtain the spiral graphene loaded with nanosilicon particles, adding the obtained spiral graphene loaded nanosilicon particles into ethyl orthosilicate aqueous solution, adjusting pH to acidic to hydrolyze, coating silica gel, and performing heat treatment in the vacuum furnace to obtain the composite cathode material of spiral graphene-silicon nanoparticle coated by silicon dioxide.