A sodium-ion battery cathode material and a preparation method thereof

By preparing open-cell, three-sided cubic Prussian blue material, the problems of rapid synthesis and additives in Fe-PBA materials were solved, achieving high-efficiency battery performance and environmentally friendly industrial production.

CN116692900BActive Publication Date: 2026-06-26ZHEJIANG HANHANG NADIAN TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG HANHANG NADIAN TECHNOLOGY CO LTD
Filing Date
2023-04-12
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing Fe-PBA materials are synthesized quickly, but are prone to oxidation, which can lead to defects that affect battery capacity and cycle performance. Furthermore, commonly used additives are expensive, harmful, and difficult to degrade, increasing costs and complexity.

Method used

Using open-cell, three-sided cubic Prussian blue materials, crystal growth is controlled by adjusting the water-soluble cellulose content and pH value, forming a rectangular block structure assembled from nanosheets, reducing ion transport distance and lattice water content, and using environmentally friendly additives.

Benefits of technology

It improves the rate performance and long-cycle performance of batteries, reduces production costs, simplifies waste liquid treatment, and meets industrial needs.

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Abstract

The application discloses a sodium ion battery positive electrode material and a preparation method thereof. By adding cheap, non-toxic, environment-friendly and easily-degradable water-soluble cellulose as an additive, the growth of a specific crystal direction can be inhibited. The hydrophilic group of the water-soluble cellulose can change the coordination environment of metal ions and reduce the entry of water molecules into the crystal lattice. In addition, by introducing the water-soluble cellulose, high-concentration reactant feeding can be realized, which is beneficial to reducing the consumption of industrial water. Meanwhile, compared with other existing additives, the water-soluble cellulose is environment-friendly, easily-degradable, low in production and separation cost, and free of toxic by-product generation. The prepared open three-face cubic Fe-based Prussian blue analogue material is good in dispersity, high in purity and uniform in morphology, and as a sodium ion battery positive electrode material, has a reversible capacity of 155.40 mAhg ‑1 at 0.1C (1C=170 mAhg ‑1 ) and a first discharge coulombic efficiency of 97.83%.
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