Modified hard carbon negative electrode material and preparation method and application thereof

By using an oxidation intermediate modification method, the problems of complex preparation technology and uneven performance of biomass-based hard carbon anode materials were solved, and modified hard carbon anode materials with excellent electrochemical performance were prepared and applied to sodium-ion batteries.

CN122301174APending Publication Date: 2026-06-30SOUTHWEST JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHWEST JIAOTONG UNIV
Filing Date
2026-04-09
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing biomass-based hard carbon anode material preparation technologies are complex and it is difficult to achieve an organic balance of comprehensive performance, thus failing to guarantee electrochemical performance.

Method used

Modified hard carbon anode materials were prepared by using an oxidation intermediate modification method, including crushing, sieving, acid washing, sodium perborate treatment, low-temperature oxidation and high-temperature carbonization steps.

Benefits of technology

The sodium storage specific capacity of the hard carbon anode material was improved, and the rate performance and cycle performance were optimized. The assembled sodium-ion battery has high initial discharge specific capacity, high initial coulombic efficiency and excellent rate performance.

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Abstract

This invention discloses a modified hard carbon anode material, its preparation method, and its application, belonging to the field of electrode material technology. The preparation method provided by this invention includes the following steps: pre-treating barbecue charcoal material, immersing it in a sodium perborate solution, washing and drying it, then performing an oxidation treatment, followed by carbonization under inert gas, and finally cooling to obtain the final product. The hard carbon anode material prepared by this invention is beneficial for increasing the C=O content in the material, improving the sodium storage specific capacity, and optimizing its rate performance and cycle performance. It is an ideal anode material for sodium-ion batteries. The sodium-ion battery assembled in this application exhibits high initial discharge specific capacity and high initial coulombic efficiency, excellent rate performance, and good stability.
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