▎ 摘　　要

NOVELTY - Preparing lithium ion battery carbon aerogel/nano-silicon/graphene composite cathode material comprises (i) (a) dissolving commercially available nano silicon powder in a polar solvent and stirring; (b) ultrasonically dispersing solution A; (c) adding a multi-anchor group polyether hyperdispersant into the pre-dispersed solution; (ii) mixing resorcinol and formaldehyde and preparing carbon aerogel; (iii) adding a certain amount of the carbon gas gel and nano silicon liquid into de-ionized water, and stirring magnetically; (iv) transferring the solution C into a reactor filled with polytetrafluoroethylene, adding de-ionized water, performing heat treatment, cooling to room temperature, washing with de-ionized water many times and placing in a vacuum drying oven; (v) dissolving carbon aerogel/nanosilicon composite material in de-ionized water and stirring uniformly; and (vi) centrifuging the solution D and washing with deionized water and absolute ethanol and drying under vacuum. USE - The lithium ion battery carbon aerogel/nano-silicon/graphene composite cathode material is useful in the fields of portable electronic devices and electric vehicles. DETAILED DESCRIPTION - Preparing lithium ion battery carbon aerogel/nano-silicon/graphene composite cathode material comprises (i) (a) dissolving commercially available nano silicon powder in a polar solvent and stirring to form a nano silicon liquid having a solid content of 21-25% to obtain a solution A; (b) ultrasonically dispersing solution A; (c) adding a multi-anchor group polyether hyperdispersant into the pre-dispersed solution and mixing uniformly to obtain solution B; (ii) mixing resorcinol and formaldehyde in a certain molar ratio and preparing carbon aerogel by a supercritical drying method using sodium carbonate as a catalyst; (iii) adding a certain amount of the carbon gas gel and 21-25% nano silicon liquid into de-ionized water, and stirring magnetically for 3-6 hours, adding a certain amount of polyvinylpyrrolidone, oscillating ultrasonically for 3-5 hours and stirring magnetically for 1-2 hours to obtain solution C; (iv) transferring the solution C into a reactor filled with polytetrafluoroethylene, adding a certain amount of de-ionized water, performing heat treatment at 160-200 degrees C for 10-15 hours, cooling to room temperature, washing with de-ionized water many times and placing in a vacuum drying oven at 75-90 degrees C for 10-12 hours and drying and collecting to obtain carbon aerogel/nanosilicon; (v) dissolving the carbon aerogel/nanosilicon composite material in de-ionized water and stirring uniformly, adding sodium dodecyl sulfate, adding graphene and shaking ultrasonically for 3-5 hours and stirring magnetically for 2-2 hours to obtain a solution D; and (vi) centrifuging the solution D and washing with deionized water and absolute ethanol and drying under vacuum.