▎ 摘　　要

NOVELTY - High-capacity silicon oxide composite negative electrode material with a multi-layer composite network crosslinked structure comprises innermost layer of silicon oxide (I), middle layer of coated carbon and outer layer of lithium salt, where the particles of the multilayer structure are connected to each other through a conductive network formed by conductive carbon to form a multilayer composite network crosslinked structure, the silicon oxide has an amorphous structure and particle size (D50) of 1-5 mu m, the amount of coated carbon and silicon oxide is 96-99 %mass, the amount of conductive carbon is 0.5-2 %mass and the amount of lithium salt is 0.5-3 %mass. USE - The high-capacity silicon oxide composite negative electrode material is used for lithium ion battery (claimed). ADVANTAGE - The high-capacity silicon oxide composite negative electrode material improves the stability of the material structure and enhances the reaction kinetics process, has narrow particle size distribution, high conductivity, high coulombic efficiency, low expansion, high cycle retention rate and simple preparation process, and is suitable for industrial production. DETAILED DESCRIPTION - High-capacity silicon oxide composite negative electrode material with a multi-layer composite network crosslinked structure comprises innermost layer of silicon oxide of formula: SiOx (I), middle layer of coated carbon and outer layer of lithium salt, where the particles of the multilayer structure are connected to each other through a conductive network formed by conductive carbon to form a multilayer composite network crosslinked structure, the silicon oxide has an amorphous structure and D50 of 1-5 mu m, the amount of coated carbon and silicon oxide is 96-99 %mass, the amount of conductive carbon is 0.5-2 %mass and the amount of lithium salt is 0.5-3 %mass. x = 0.9-1.2. INDEPENDENT CLAIMS are included for the following: (1) a method for preparing the high-capacity silicon oxide composite negative electrode material, which involves (i) adding silicon oxide powder to protonated chitosan solution, and uniformly mixing the solid and liquid phases with high energy to obtain a slurry (A), (ii) spray-drying and calcining the slurry (A) to obtain a carbon-coated silicon oxide material, (iii) uniformly mixing the carbon-coated silicon oxide material, conductive carbon and lithium salt to obtain a slurry (B), and (iv) spray-drying the slurry (B) to obtain the high-capacity silicon oxide composite negative electrode material; and (2) a lithium ion battery comprising a negative electrode material, where the negative electrode material is the high-capacity silicon oxide composite negative electrode material.