A hard carbon material, its preparation method and application

By leveraging the synergistic effect of heteroatom doping and molten salt etching, the interlayer spacing of hard carbon materials is increased and graphite microcrystal defects are introduced, thus solving the problems of poor cycle and rate performance of hard carbon materials. This enables the rapid transfer and diffusion of sodium-ion batteries, making them suitable for industrial production.

CN117509613BActive Publication Date: 2026-05-26福建龙净储能电池有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
福建龙净储能电池有限公司
Filing Date
2023-12-14
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing hard carbon materials result in poor cycle performance and rate performance of sodium-ion batteries due to the disordered graphite microcrystalline stacking structure. Sodium ions fail to fully enter the pores and carbon layers during charging, and their large volume changes affect battery performance.

Method used

By combining heteroatom doping and molten salt etching with hybrid granulation technology, the interlayer spacing of hard carbon materials is increased, graphite microcrystal defects and active centers are introduced, thereby improving the cycle and rate performance of sodium-ion batteries.

Benefits of technology

It significantly improves the cycle performance and rate performance of sodium-ion batteries, and enables rapid transfer and diffusion of sodium ions, making it suitable for large-scale industrial production.

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Abstract

This invention provides a hard carbon material, its preparation method, and its application. The preparation method includes the following steps: heating, mixing, and granulating a precursor, dopant, molten salt agent, and curing agent to obtain mixed particles; and carbonizing the mixed particles to obtain the hard carbon material. The preparation method of this invention, through the synergistic effect of heteroatom doping and molten salt etching, combined with mixed granulation, ensures the effectiveness of doping and etching, increases the interlayer spacing of the hard carbon material, introduces additional graphite microcrystal defects and active centers, and increases defects on the surface and edges of the carbon layer, thereby improving the cycle and rate performance of sodium-ion batteries.
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