Pre-sodium treated positive electrode material for copper-zinc-based sodium ion battery and method of preparing the same

The pre-sodiated copper-zinc-based sodium-ion battery cathode material addresses the limitations of copper-based materials by incorporating zinc and nickel, reducing oxidative decomposition and enhancing sodium ion diffusion, thereby stabilizing the electrochemical environment and improving battery performance.

JP2025129002AActive Publication Date: 2025-09-03GUIZHOU ZHENHUA E CHEM INC +2
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Patent Information

Application Number
JP2024135714
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-02-22
Filing Date
2024-08-15
Publication Date
2025-09-03
Estimated Expiration
2044-08-15

AI Technical Summary

Technical Problem

Existing copper-based sodium-ion battery cathode materials suffer from low specific capacity, rapid degradation due to oxidative decomposition of the electrolyte, and high gas generation during long cycles, limiting their energy density and practical application.

Method used

A pre-sodiated copper-zinc-based sodium-ion battery cathode material is developed through a method involving wet pre-sodiation, sanding, spray-drying, and sintering, incorporating zinc and nickel to reduce oxidizability and enhance sodium ion diffusion, with a chemical formula Na_mCu_xZnyFe_zM_1-x-y-zO2, where M includes various metals.

Benefits of technology

The method significantly reduces gas generation and stabilizes the electrochemical environment, improving the battery's electrical performance and cycle life by enhancing sodium ion diffusion and reducing residual sodium content.

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Abstract

To provide a pre-sodium treated positive electrode material for a copper-zinc-based sodium ion battery and a method of preparing the same.SOLUTION: A method includes: obtaining a mixed solution containing copper-zinc-based elements through wet pre-sodium treatment; then conducting spray drying of the mixed solution containing copper-zinc-based elements to obtain precursor powder of a positive electrode material for a copper-zinc-based sodium ion battery; and then mixing the precursor powder with a sodium source for sintering, coating and crushing to obtain a positive electrode material for a copper-zinc-based sodium ion battery. A positive electrode material for a battery of the present invention introduces weakly oxidizing zinc and nickel elements based on a copper-based material, and reduces the use of highly oxidizing copper and iron elements. After the material is prepared into a battery, the oxidation of metal ions in an electrochemical environment is reduced overall, so that the oxidation of copper ions to an electrolyte is greatly reduced, CO2 gas generated by oxidation and decomposition of the electrolyte is reduced, the electrochemical environment is stabilized, and the electrical performance of the battery is improved.SELECTED DRAWING: Figure 1
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Citation Information

Patent Citations

  • Sodium-ion battery positive electrode material and preparation method and application thereof

    CN114975982A

  • Oxide sodium-ion battery positive electrode material and preparation method and application thereof

    CN115504526A

  • Sodium-ion battery quaternary positive electrode material precursor and preparation method and application thereof

    CN115594233A