A negative electrode composite dispersant for sodium-ion batteries and a preparation method thereof

By using a composite dispersant of modified carboxymethyl cellulose and modified multi-walled carbon nanotubes, the dispersibility and stability issues of sodium-ion battery anode materials were solved, resulting in a more uniform slurry distribution and higher battery cycle performance.

CN120767331BActive Publication Date: 2026-07-14JIANGSU YITE NEW MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGSU YITE NEW MATERIAL CO LTD
Filing Date
2025-06-25
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing sodium-ion battery anode materials suffer from poor dispersibility, insufficient stability, high interfacial impedance, and poor cycle performance. In particular, hard carbon materials tend to agglomerate in the electrode slurry, resulting in uneven coating thickness and reduced utilization of active materials.

Method used

A composite dispersant containing modified carboxymethyl cellulose and modified multi-walled carbon nanotubes is used. The dispersant enhances the binding force of hydrophobic and hydrophilic groups to the hard carbon surface. Combined with the directional adsorption of polyacrylic acid, a uniform three-dimensional network structure is formed, which prevents the agglomeration of nanoparticles and improves dispersion stability and electron transport efficiency.

Benefits of technology

It significantly improves the stability and electron transport rate of the negative electrode slurry, reduces structural failure during cycling, and enhances the cycle performance and first-cycle coulombic efficiency of sodium-ion batteries.

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Abstract

The application provides a negative electrode composite dispersant for a sodium ion battery and a preparation method thereof. The negative electrode composite dispersant comprises a main dispersant and a secondary dispersant; the main dispersant comprises polyacrylic acid and modified carboxymethyl cellulose; and the secondary dispersant comprises graphene oxide and modified multi-walled carbon nanotubes. Through structural modification of the main dispersant, the hydrophobic and hydrophilic chain segments are increased, the binding force with the hydrophobic micro area on the surface of hard carbon is enhanced, the dispersant desorption rate is reduced, and hard carbon agglomeration is reduced. In combination with the effect of polyacrylic acid, directional adsorption is realized, and the dispersion stability is improved. The modified multi-walled carbon nanotubes and the main dispersant have a uniform three-dimensional network structure, a large surface area and abundant mesoporous structures, promote the transmission kinetics of electrons and ions, provide more active sites, relieve volume expansion, and make the conductivity and mechanical properties of the carbon nanotubes more uniform through the combination of organic covalent effects, so that the overall performance of the negative electrode dispersant is improved.
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