A tin-cobalt alloy / carbon composite nanoparticle modified micrometer-sized porous silicon composite material, and a preparation method and application thereof

Abstract

The present application belongs to the field of inorganic micrometer composite material, and particularly relates to a tin-cobalt alloy / carbon composite nanoparticle modified micrometer porous silicon composite material, a preparation method and application thereof. The present application successfully realizes uniform distribution and loading of tin-cobalt alloy / carbon composite nanoparticles on the surface and inside of a porous silicon skeleton. The synthesis firstly removes the aluminum component in a commercial silicon-aluminum alloy by acid etching to obtain a micrometer porous silicon structure, then loads cyanometal framework compound (CMFs) nanoparticles on the porous silicon substrate through a solvothermal reaction, and then obtains the tin-cobalt alloy / carbon composite nanoparticle modified micrometer porous silicon composite material through a heat treatment process. The method is innovative in idea, simple in operation and easy to scale up, and the obtained composite material solves the problems of large volume expansion and poor conductivity of the silicon-based negative electrode, significantly improves the cycle performance, and has great application potential in the field of silicon-based lithium ion battery negative electrode materials.

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