Silicon-carbon negative electrode material and preparation method thereof

The invention discloses a silicon-carbon negative electrode material and a preparation method thereof. The preparation method of the silicon-carbon negative electrode material comprises the following steps: S1, immersing porous carbon into an acidic treatment solution for acidizing to obtain a material A; s2, adding metal chloride and thioacetamide into the material A, and mixing to obtain a material B; s3, adding a liquid silicon source into the material B, mixing, and carrying out hydrothermal treatment under the protection of inert gas to obtain a material C; s4, a boron-containing gel solvent composed of deionized water, an organic polymer and a boron-containing substance is added into the material C for a reaction, drying is conducted after the reaction is completed, and a material D is obtained; and S5, sintering the material D in an inert atmosphere to obtain the silicon-carbon negative electrode material. According to the silicon-carbon negative electrode material prepared by the invention, the proble