A sodium-ion battery positive electrode material precursor, a preparation method and application thereof

By hydrophilizing the conductive carbon material and adding anionic dispersants, the problem of carbon black agglomeration in the precursor of sodium-ion battery cathode material was solved, achieving uniform dispersion and carbon layer distribution of the material, improving electrochemical performance and production efficiency, and reducing costs.

CN122166739APending Publication Date: 2026-06-09CHENZHOU NAIPU POWER SUPPLY CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHENZHOU NAIPU POWER SUPPLY CO LTD
Filing Date
2026-01-21
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In existing sodium-ion battery cathode material precursors, carbon black agglomerates are difficult to disperse evenly, resulting in poor spray drying effect and uneven carbon layer distribution, which affects the conductivity and electrochemical performance of the material, and also leads to low production efficiency and high cost.

Method used

By subjecting conductive carbon material to surface hydrophilic treatment and adding anionic dispersant to form a uniform precursor slurry, followed by spray drying and calcination under a protective atmosphere, a carbon-coated sodium iron phosphate sulfate composite material was prepared.

Benefits of technology

This method achieves uniform dispersion of carbon black at high solid content, improves the electronic conductivity and structural stability of the material, enhances electrode performance, reduces production costs, and strengthens process controllability and repeatability.

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Abstract

This invention discloses a precursor for a sodium-ion battery cathode material, its preparation method, and its application. The method includes the following steps: S1, carbon material pretreatment: a non-hydrophilic conductive carbon material is surface-hydrophilized to obtain a stabilized carbon material; S2, slurry preparation: the stabilized carbon material, a sodium source, an iron source, a phosphorus source, and a sulfur-containing source are mixed with water and dispersed to form a homogeneous slurry; an anionic dispersant is added to the homogeneous slurry and mixed evenly to obtain the precursor slurry. Compared to existing technologies, this invention solves the problem of non-hydrophilic carbon agglomeration in the precursor by pretreating the carbon material and adding an anionic dispersant, constructing a more efficient conductive network and significantly improving the electronic conductivity and structural stability of the material.
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