METHOD FOR PREPARING SILICON-CARBON COMPOSITE NEGATIVE ELECTRODE MATERIAL AND USE THEREOF

• Main Authors: RUAN, Dingshan, FENG, Maohua, LIU, Baoye, LI, Changdong, WU, Xingyu
• Format: Patent
• Language: Chinese; English; French
• Published: 09.11.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; COMPOUNDS THEREOF; DIFFUSION TREATMENT OF METALLIC MATERIAL; ELECTRICITY; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

Disclosed herein are a method for preparing a silicon-carbon composite negative electrode material and use thereof. The method comprises: heating a super-crosslinked polymer in an inert atmosphere for carbonizing to give a porous carbide; mixing the porous carbide with a silicon-containing solution to give a silicon-containing porous carbide suspension; adding a complexing agent, a metal salt, and a reducing agent into the silicon-containing porous carbide suspension for reaction, separating solid and liquid phases after the reaction, and heating a resultant solid in an inert atmosphere to give the silicon-carbon composite negative electrode material. By means of processing with silicon-intercalated metal, a metal salt is reduced with a reducing agent under the action of a complexing agent, such that a metal layer is applied to the silicon layer adsorbed on the porous carbide. The metal layer and the silicon are alloyed at a high temperature, such that the expansion, bending, and compression performance of th