Sodium iron sulfate, and preparation method therefor and use thereof

Preparation of sodium ferrosulfate by microwave solvent thermal method solves the problem of low particle size control and density of the positive electrode material of sodium ion battery, and realizes an efficient and energy-saving preparation process, improving the ratio capacity and circulation performance of the material.

WO2025000924A1PCT designated stage expired Publication Date: 2025-01-02SHENZHEN INST OF ADVANCED TECH
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Patent Information

Application Number
PCT/CN2023/137646
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-06-27
Filing Date
2023-12-08
Publication Date
2025-01-02

AI Technical Summary

Technical Problem

The particle size of the existing sodium ion battery positive electrode materials is difficult to control, the tap density is low, the preparation method is complex and the energy consumption is high, which affects its high magnification capacity and cycling performance.

Method used

The preparation of sodium ferrosulfate is carried out by microwave solvent-thermal method, and crystal nuclei of different particle sizes are generated through multi-stage heating to achieve particle size combination, increase tap density, simplify the process and reduce energy consumption.

Benefits of technology

It realizes the efficient and controllable preparation of sodium ferric sulfate, improves its high-magnification capacity and circulation performance as a positive electrode material of sodium ion battery, and has excellent electrochemical performance and energy-saving and environmentally friendly advantages.

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Abstract

A sodium iron sulfate, and a preparation method therefor and a use thereof, relating to the technical field of secondary battery materials. The preparation method comprises: carrying out microwave solvothermal reaction on a mixed solution of a sodium source, an iron source, a sulfur source and an antioxidant, wherein during the microwave solvothermal reaction, the temperature is sequentially maintained at temperatures T1, T1', T2, T2' and T3, the temperatures T1, T2 and T3 are separately independently selected from 200-350°C, and the temperatures T1' and T2' are separately independently selected from 100-180°C. According to the preparation method, sodium iron sulfate having particle size gradation can be prepared, and the tap density of the sodium iron sulfate is improved, thereby improving the high-rate capacity and the high-rate cycle performance when the sodium iron sulfate is used as a sodium ion battery positive electrode material.
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Citation Information

Patent Citations

  • Micron-sized porous sodium ferrous sulfate / carbon composite positive electrode material and sodium ion battery or sodium battery prepared from same

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  • Preparation method of sodium ferrous sulfate positive electrode material

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  • Preparation method of sodium ferric sulfate positive electrode material

    CN115863570A

  • Sodium ferric sulfate composite positive electrode material and preparation method thereof

    CN115893505A

  • Production method of battery-grade nano sodium ferrous sulfate

    CN115974043A

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