Sp2-rich porous carbon, negative electrode material thereof, preparation method and application

By treating porous carbon in a supercritical environment and loading nanosilicon, the sp2 carbon content and mechanical properties of the negative electrode material are improved, and the problem of easy shattering of traditional porous carbon materials in the negative electrode material is solved, which significantly improves the electrochemical performance.

CN119660706APending Publication Date: 2025-03-21NINGBO YINGCHUANG SCI & TECH ACHIEVEMENTS TRANSFORMATION SERVICE PARTNERSHIP (LLP)
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Patent Information

Application Number
CN202411506675.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-25
Publication Date
2025-03-21

AI Technical Summary

Technical Problem

In the negative electrode materials, traditional porous carbon is prone to breaking during the rolling and cell cycle of the electrode sheet in the negative electrode materials, which reduces electrochemical performance and may cause safety problems.

Method used

By reacting the porous carbon substrate with a specific additive in a supercritical environment formed by sealing and heating conditions, the proportion of sp2 carbon in the porous carbon is increased, and nanosilicon is loaded by vapor deposition to prepare a sp2-rich porous carbon-loaded nanosilicon anode material.

Benefits of technology

The flexibility and mechanical properties of porous carbon are significantly improved, the crushing problem of negative electrode materials during rolling and battery cell cycle is avoided, and the overall electrochemical performance of silicon carbon anode material is optimized.

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Abstract

The invention relates to sp2-rich porous carbon and a negative electrode material, a preparation method and application thereof. The preparation method comprises the following steps that a porous carbon base material and an additive are mixed and react in a supercritical environment formed under the sealed heating condition, sp2-enriched porous carbon is prepared, the additive is selected from at least one of water, dry ice, nitrogen, dinitrogen oxide, ethylene or trifluoromethane, and the additive is selected from at least one of nitrogen, nitrogen, dinitrogen oxide, ethylene or trifluoromethane. The mass ratio of the additive to the porous carbon base material is (10: 1)-(1: 10). According to the preparation method, the proportion of sp2 carbon in the porous carbon can be remarkably increased, the flexibility of the porous carbon is improved, and the porous carbon serving as a base material of a silicon-carbon negative electrode material is beneficial to improving the electrochemical performance.
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