A sodium iron manganese magnesium phosphate positive electrode material and a preparation method thereof

By introducing electric and magnetic field reactions during the preparation of sodium iron manganese magnesium phosphate cathode material, highly crystalline sodium iron manganese magnesium phosphate material is generated, solving the problem of low capacity in existing technologies and achieving high capacity and long lifespan battery performance.

CN122102094AActive Publication Date: 2026-05-29XINYANGFENG AGRI TECH CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XINYANGFENG AGRI TECH CO LTD
Filing Date
2026-04-28
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing polyanionic sodium cathode materials have low capacitance, making it difficult to meet the needs of large-scale industrial production. Furthermore, impurity phases are easily generated during the preparation process, affecting electrical performance and service life.

Method used

Magnesium sulfate, ferrous sulfate, manganese sulfate, sodium carbonate, etc. are used as raw materials to generate a slurry under stirring. The slurry is then reacted under the action of an alternating electric field and a magnetic field. Subsequently, the slurry is filtered, washed, dried, and rapidly sintered to produce sodium iron manganese magnesium phosphate cathode material.

Benefits of technology

It improves the crystallinity and carbon coating effect of the material, enhances the material's capacity, rate performance and cycle life, achieves high compaction density and high electrical capacity, and improves the driving range and service life of electric vehicles.

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Abstract

The application relates to a sodium iron manganese magnesium phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of sodium batteries. The preparation method comprises the following steps: (1) under the stirring state, magnesium sulfate solution, ferrous sulfate solution, manganous sulfate solution and sodium carbonate solution are added into a reaction kettle; (2) the slurry is filtered and washed, the filter cake after washing is added with water to prepare a slurry, then phosphoric acid, sodium bicarbonate solution and sucrose are added into the reaction kettle, and then the slurry is reacted under the action of an alternating current field and a magnetic field for 3-6 hours; (3) the slurry after reaction is filtered, washed and dried to obtain sodium iron manganese magnesium phosphate; (4) rapid sintering and mechanical crushing are carried out to obtain the sodium iron manganese magnesium phosphate positive electrode material. The material prepared by the application has higher crystallinity and better carbon coating effect, so that the synthesized material has higher capacity, more excellent rate performance and longer cycle life compared with the material synthesized without adding an electric field and a magnetic field.
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