Silicon-carbon material, preparation method thereof, negative plate and battery

Through a multi-step polymerization and catalytic reaction preparation method, silicon carbon material with a porous structure and a conductive carbon layer is formed, which solves the problem of excessive volume expansion of silicon carbon material during charging and discharging, and realizes efficient conductivity and stable circulation of the material.

CN119650623APending Publication Date: 2025-03-18SHANGHAI XUANYI NEW ENERGY DEV CO LTD
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Patent Information

Application Number
CN202411717749.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-27
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

The existing silicon-carbon materials have problems of excessive volume expansion during charging and discharging, resulting in rapid attenuation of material capacity and decreased circulation stability.

Method used

By a preparation method, it includes performing a multi-step polymerization reaction and catalytic reaction in the protective gas to form a silicon-carbon material composed of an inner porous carbon sphere, an intermediate layer of elemental silicon and an outer layer of dense porous carbon layer. This method relieves the expansion of silicon and increases the conductivity by forming a porous structure and a conductive carbon layer.

Benefits of technology

It effectively reduces the expansion rate of silicon-carbon materials, improves its conductivity and cycling stability, and enhances the rate performance of the battery.

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Abstract

The invention provides a silicon-carbon material and a preparation method thereof, a negative plate and a battery. The preparation method comprises the following steps: carrying out a first polymerization reaction on raw materials comprising first styrene, a first initiator and a first solvent, and adding a first cationic monomer in the process of the first polymerization reaction to obtain cationic polystyrene spherical particles; carrying out catalytic reaction on raw materials comprising the cationic polystyrene spherical particles, a catalyst, a silicon source and a second solvent, and adding a silane coupling agent in the catalytic reaction process to obtain silica-coated cationic polystyrene spherical particles; performing a second polymerization reaction on raw materials including the silica-coated cationic polystyrene spherical particles, second styrene, a second initiator and a third solvent, and adding a second cationic monomer in the process of the second polymerization reaction to obtain a coated product; and calcining the coated product and a reducing agent to obtain the silicon-carbon material. The silicon-carbon material prepared by the method has relatively low expansion rate.
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