Graphite negative electrode material and preparation method thereof

By covering the outer layer of silicon carbide with carbon nanotubes, the problem of volume expansion of silicon carbide during charging and discharging is solved, the capacity and stability of graphite negative electrode materials are improved, and the performance of the battery is significantly improved.

CN119650660APending Publication Date: 2025-03-18FUJIAN SHANSHAN TECH CO LTD
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Patent Information

Application Number
CN202411928084.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-25
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

The existing silicon carbide modification methods have volume expansion problems during charging and discharging, which leads to particles powdering and falling off, affecting the cycle stability of the battery.

Method used

By covering the outer layer of silicon carbide, the expansion deformation of carbon nanotubes is limited, and the carbon nanotube/silicon carbide composite material is prepared.

Benefits of technology

The discharge capacity and stability of artificial graphite negative electrode materials are improved, the risk of silicon carbide pulverization and shedding is reduced, and the energy density and cycling performance of the battery are significantly improved.

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Abstract

The invention discloses a graphite negative electrode material and a preparation method thereof. The invention provides a carbon nano tube / silicon carbide composite material which comprises silicon carbide particles and carbon nano tubes, and the carbon nano tubes are coated on the silicon carbide particles. According to the carbon nano tube / silicon carbide composite material and the carbon nano tube / silicon carbide-graphite matrix composite material disclosed by the invention, a graphite negative electrode material with a stable overall structure and high capacity is obtained by adopting a new coating mode and a new coating process, and the graphite negative electrode material can be used for an artificial graphite negative electrode.
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