Hard carbon negative electrode material, preparation method thereof and sodium ion battery

By using starch, cellulose, and resin as raw materials, combined with oxidative crosslinking and low-temperature carbonization, a hard carbon anode material with abundant closed-pore structure was prepared, which solved the problem of low capacity of hard carbon materials and improved the energy density and electrochemical performance of sodium-ion batteries.

CN118754100BActive Publication Date: 2026-07-14四川佰思格新材料科技有限公司
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Patent Information

Application Number
CN202410991271.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-07-23
Publication Date
2026-07-14
Estimated Expiration
2044-07-23

AI Technical Summary

Technical Problem

Existing hard carbon materials have low capacity when used in sodium-ion batteries, which limits their application in sodium-ion batteries.

Method used

Using starch, cellulose, and resin as raw materials, a hard carbon anode material with abundant closed-pore structure is prepared by oxidative cross-linking treatment with oxidizing acid followed by carbonization. Combined with low-temperature carbonization and spherical precursor structure, the sodium storage capacity of the material is improved.

Benefits of technology

The prepared hard carbon anode material significantly improves the energy density and electrochemical performance of sodium-ion batteries, and enhances the kinetics and low-temperature performance of the full cell.

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Abstract

The application relates to the technical field of battery materials, in particular to a hard carbon negative electrode material, a preparation method thereof and a sodium ion battery. The preparation method comprises the following steps: starch, cellulose and resin are mixed to obtain mixed raw materials; an oxidizing acid is added into the mixed raw materials, and oxidation crosslinking treatment is carried out at 50-200 DEG C to obtain oxidation-crosslinking materials; the oxidation-crosslinking materials are washed to obtain washed materials; the washed materials are granulated to obtain spherical precursors; the spherical precursors are subjected to low-temperature carbonization in an inert atmosphere to obtain low-temperature pretreated precursors; and the low-temperature pretreated precursors are subjected to carbonization at 1200-1600 DEG C in an inert atmosphere to obtain the hard carbon negative electrode material. The hard carbon negative electrode material is prepared by taking starch, cellulose and resin as the mixed raw materials, combining the pretreatment process of oxidation crosslinking and low-temperature carbonization, the prepared hard carbon negative electrode material has rich closed pore structures and is mainly located on the surface, and the capacity can be improved.
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Citation Information

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