▎ 摘　　要

NOVELTY - Graphene/carbon nanotube/porous silicon composite material is prepared by adding acidified carbon nanotubes to a graphene oxide aqueous solution under ultrasonic treatment (I) to obtain a graphene oxide/carbon nanotube solution, adding an aluminum-silicon alloy to the graphene oxide/carbon nanotube solution under ultrasonic treatment (II), adding a graphene oxide reducing agent to the obtained suspension solution under ultrasonic treatment (III), leaving still, filtering or centrifuging, washing to neutrality and vacuum drying to obtain the material, adding the material to an inorganic acid solution, mixing and stirring, filtering or centrifuging to neutrality, and vacuum drying to obtain the product. USE - The material is useful for lithium battery applications (claimed). ADVANTAGE - The material has excellent reversible capacity, cycle stability and rate performance. The method requires minimal equipment, consumes low energy, adopts simple process steps, is highly controllable, and adopts industrial-scale production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the composite material involving (a) adding carbon nanotubes to inorganic acid under ultrasonic treatment, washing with deionized water and vacuum drying to obtain acidified carbon nanotubes, (b) adding graphene oxide to deionized water under ultrasonic dispersion to obtain an aqueous solution of graphene oxide, (c) adding the acidified carbon nanotubes to the graphene oxide aqueous solution under ultrasonic treatment to obtain a graphene oxide/carbon nanotube composite solution, (d) adding the aluminum-silicon alloy to the graphene oxide/carbon nanotube composite solution and ultrasonically treating to obtain a suspension solution, (e) adding the reducing agent to the above suspension solution under ultrasonic treatment, leaving still, washing, and vacuum drying to obtain the product, and (f) adding the product to the inorganic acid solution, stirring, filtering or centrifuging, and vacuum drying to obtain the finished product.