Preparation method of silicon negative electrode material coated with solid electrolyte layer

• Main Authors: ZHANG RUI, ZHANG HOUPO, ZHANG LITENG, RAO SHAOJIAN, WANG YONG
• Format: Patent
• Language: Chinese; English
• Published: 17.11.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; ELECTRICITY; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention discloses a solid electrolyte layer coated silicon negative electrode material preparation method, which comprises: placing lithium carbonate and an organic polymerization monomer in an inert solvent to carry out a solvothermal reaction, and carrying out a ring-opening reaction on the organic polymerization monomer to generate a mixture A containing a low polyether polymer; dissolving an organic solid electrolyte and a lithium salt in an organic solvent to obtain a solution B; and uniformly mixing and stirring the mixture A, the solution B and the silicon negative electrode particles, and carrying out spray drying to obtain the solid electrolyte layer coated silicon negative electrode material. The expansion of the silicon-based negative electrode material in the charging and discharging process is effectively inhibited, and the interfacial ionic conductivity of the silicon-based negative electrode material and the solid electrolyte is remarkably improved. 本发明公开了一种固态电解质层包覆的硅负极材料制备方法，包括以下步骤：将碳酸锂和