▎ 摘　　要

NOVELTY - Preparing porous silicon/graphene composite lithium ion battery anode material comprises e.g. (i) cut pure aluminum into small pieces, weighing aluminum and silicon, drying graphite crucible, placing in resistance furnace, heating, (ii) cutting aluminum-silicon alloy bar into small pieces and placing in a plastic container, adding hydrochloric acid solution into vessel, stirring, and (iii) adding deionized water into porous nano-silica and adding carboxymethyl cellulose, adding sodium dodecyl sulfate and graphene, placing dried material in tubular heating furnace, cooling, and sintering. USE - The method is useful for preparing porous silicon/graphene composite lithium ion battery anode material (claimed). ADVANTAGE - The composite lithium ion has simple process, excellent specific surface area, improved graphene composite battery capacity and excellent cycle performance. DETAILED DESCRIPTION - Preparing porous silicon/graphene composite lithium ion battery anode material comprises (i) cut pure aluminum into small pieces with sandpaper to remove surface of scale, weighing aluminum and silicon, drying graphite crucible, placing in resistance furnace, heating at 500-700 degrees C and then adding into aluminum block, melting, wrapping with aluminum foil, drying with a graphite bell jar into aluminum liquid, holding for 1-5 minutes, removing bell jar, insulating for 15-35 minutes, stirring with a graphite rod for 1-3 minutes to make the alloy liquid, pouring slag into mold made of rod-shaped aluminum-silicon alloy, silicon content in aluminum silicon alloy is 5-25 wt.%, (ii) cut aluminum-silicon alloy bar into small pieces having thickness of 5-15 mm and then placing in plastic container, adding excess of hydrochloric acid solution into vessel to dissolve aluminum in aluminum-silicon alloy, stirring for 10-30 minutes, carrying out whole process in ventilated kitchen, removing metal aluminum, filtering and washing to obtain a silicon powder, adding silicon powder into a plastic container, and then adding hydrogen fluoride solution to soak silica powder for 20-30 minutes, stirring, carrying out whole process in ventilated kitchen, washing with deionized water, filtering for 6-15 times, drying at 80-200 degrees C under vacuum to obtain porous nano-silica powder, (iii) adding deionized water into porous nano-silica and adding carboxymethyl cellulose, stirring mechanically for 15-25 minutes until porous nano-silica particles are completely suspended to obtain porous nano-silica particle suspension, adding sodium dodecyl sulfate and graphene into deionized water, stirring mechanically for 10-25 minutes until graphene is completely dissolved to obtain a graphene suspension, mixing porous nano-silica pellet suspension with graphene suspension, where mass percentage of porous nano-silica particles and graphene is 5-30 wt.% porous nano-silicon, 70-95 wt.% graphene, and stirring mechanically for 10 minutes after ultrasonic shock to obtain mixed solution, and then subjecting mixed solution to suction filtration, washing to neutral, collecting solid material for vacuum drying, placing dried material in tubular heating furnace at 750-900 degrees C for 5-9 hours, cooling to room temperature, and sintering to obtain final product.