A hard carbon negative electrode material, a preparation method and application thereof

By deeply chemically compounding furan resin with starch and performing segmented heating carbonization, the shortcomings of hard carbon materials in balancing high capacity, first-efficiency coulombic efficiency, and long lifespan have been overcome, and a high-performance hard carbon anode material suitable for sodium-ion and lithium-ion batteries has been prepared.

CN122685043APending Publication Date: 2026-09-04GUANGXI NORMAL UNIV
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Patent Information

Application Number
CN202610750519.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-28
Publication Date
2026-09-04

AI Technical Summary

Technical Problem

Existing hard carbon materials have shortcomings in balancing high capacity, high first-efficiency coulombic efficiency, excellent rate performance, long cycle life, and low cost. Furthermore, the simple physical mixing of starch and crosslinking agent makes it difficult to achieve uniform composite, resulting in unstable material performance.

Method used

By employing deep chemical composites of furan resin and starch, a stable three-dimensional network structure is formed through specific solvents and vacuum treatment. Combined with segmented heating carbonization, the graphite microcrystalline structure and pore structure of hard carbon materials are precisely controlled.

Benefits of technology

A hard carbon anode material with high tap density, high capacity, and high rate performance was prepared, which is suitable for sodium-ion and lithium-ion batteries. This material achieves high energy storage performance and long lifespan while reducing costs.

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Abstract

The application relates to the field of electrochemistry and battery technology, in particular to a hard carbon negative electrode material, a preparation method and application thereof, the preparation method is based on starch, the microstructure of the starch-based spherical hard carbon is controlled through resin compounding, the structure-adjustable hard carbon negative electrode material is obtained through segmented temperature rising treatment under an inert atmosphere, and the preparation method comprises the following steps: (1) preparing a composite solvent; (2) precursor compounding modification; (3) high-temperature carbonization, and obtaining the base hard carbon negative electrode material. The preparation method promotes the reservation of the spherical starch particles in the preparation process, the spherical material particles can improve the compaction during the production of the pole piece, the energy density of the battery is improved, the controllable adjustment of the internal structure of the hard carbon is realized, and then the negative electrode hard carbon material suitable for the fast-charging or high-capacity use scene is synthesized.
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