Preparation method of carbon cloth supported lithium ion battery silicon-carbon negative electrode material

The invention belongs to the field of energy storage, and particularly relates to a preparation method of a carbon-cloth-supported lithium ion battery silicon-carbon negative electrode material, which is characterized in that the surface of cellulose in cotton contains a large number of hydroxyl groups, so that organosilane can be stably grafted and self-organized on the surface of the cotton through chemical bonding to form a uniform single layer; the modification of the cotton is completed. And carbonizing and activating the modified cotton under the protection of inert gas at the temperature of 400-900 DEG C to obtain the silicon-carbon composite material. The composite material is of a composite structure of which the surface is grafted with silicon particles, the silicon particles grafted on the outer layer can give full play to the advantage of high specific volume, and a carbon skeleton provides a volume expansion buffer area and enhances the conductivity; and the carbon cloth has good mechanical prope