Depolymerization method of carbon-coated negative electrode material

Through a multi-step synergistic method of surface activation treatment, rotary wheel grinding and secondary carbonization, the aggregation problem of carbon-covered negative electrode materials is solved, the material performance and production efficiency are improved, and it is suitable for negative electrode materials such as graphite and silicon.

CN120600783APending Publication Date: 2025-09-05HUZHOU KAIJIN NEW ENERGY TECH CO LTD +1
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Patent Information

Application Number
CN202510681773.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-26
Publication Date
2025-09-05

AI Technical Summary

Technical Problem

There is agglomeration phenomenon during the preparation process of carbon-coated negative electrode materials, resulting in uneven particle size distribution, a decrease in specific surface area and a decrease in active sites. The prior art often exchanges for the depolymerization effect at the expense of material performance or economy.

Method used

The van der Waals force between particles is reduced by surface activation treatment, and the frictional heat of the rotary wheel mill and the carbon precursor are depolymerized, and the material performance is optimized through grading screening and secondary high-temperature carbonization to form a complete carbon cladding layer.

Benefits of technology

It realizes efficient dispersion of agglomerates, repairs carbon layer defects, reduces energy consumption, improves material electrochemical performance, and improves production economy. It is suitable for a variety of negative electrode material systems.

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Abstract

The invention relates to the field of preparation of negative electrode materials, in particular to a depolymerization method of a carbon-coated negative electrode material, which comprises the following steps: (1) carrying out surface activation treatment on an agglomerated carbon-coated negative electrode material to reduce Van der Waals' force among particles; (2) depolymerizing the activated particles through a spinning roller mill, injecting a carbon precursor into the spinning roller mill, and primarily carbonizing the carbon precursor by using friction heat of the spinning roller mill to form a surface repairing layer; and (3) carrying out graded screening on the depolymerized particles, screening out particles with target particle sizes, and carrying out secondary high-temperature carbonization to form a complete carbon coating layer. According to the method, through three-stage process cooperation of surface activation, dynamic carbon repair and closed-loop grading, the bottlenecks of low efficiency, large damage and high cost in the traditional depolymerization technology are broken through, and the economical efficiency of large-scale production is realized while the electrochemical performance of the material is improved.
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