▎ 摘　　要

NOVELTY - Silicon-carbon composite material with a controllable internal volume, comprises nano three dimensional graphene porous particles, carbon nano tube/conductive carbon fiber, nano silioxide particles and amorphous carbon formed by composite secondary porous spherical or spherical particles. The silicon-carbon composite material has a porous structure inside and a dense structure outside. The controllable internal volume of the silicon-carbon composite material is determined by nano-SiOx particles. The expansion volume space when lithium intercalation is uniformly distributed around the nano SiOx particles. The expanded volume space is separated by three-dimensional graphene porous particles, carbon nanotubes and amorphous carbon. The expansion volume is regulated by removable inorganic substances. USE - The composite material is useful in a lithium ion battery (claimed). ADVANTAGE - The composite material is highly stable in the recycling process. The method is safe, reliable, simple, and easy to scale production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the composite material, comprising (i) adding micron-sized SiOx particles, dispersant and solvent A into a closed stirring tank and continuously introduce nitrogen gas, and grinding with zirconia balls with a particle size of 0.03-0.1 mm to a particle size of 30-100 nm to obtain nano-SiOx particles, (ii) adding removable inorganic substances and surfactants to the nano SiOx particles, adjusting the pH to 4-6 with acetic acid, and grinding to a particle size less than 100 nm, adding three-dimensional graphene porous particles, organic matter, carbon nanotubes/conductive carbon fibers and solvent A, continuously grinding to a particle size less than 500 nm, adjusting the slurry viscosity to 500-1500 MPa/s, and drying by aerosolization to obtain a mixed material, (iii) placing the mixed material in a tube furnace, and performing high-temperature heat treatment under the protection of inert gas to obtain a first composite material, (iv) adding the organic matter, the dispersant and the first composite material into the solvent B, and mixing and stirring at 70-120° C until the solvent B is completely volatilized to obtain a mixture, placing the mixture in a tube furnace and subjecting to high-temperature heat treatment under the protection of inert gas to obtain the second composite material, and (v) adding the second composite material into solvent C and mixing and stirring for 0.8-1.2 hours, filtering solvent C and washing for 1-2 times, washing with deionized water for 3-4 times, and drying.