Preparation method of high-compaction lithium manganese iron phosphate positive electrode material

Through high-speed nano ball mill assisted secondary sintering method and carbon coating technology, the problems of conductivity and compaction density of lithium manganese iron phosphate positive electrode material are solved, and the efficient conductivity and good compaction density of the material are achieved while reducing the specific surface area.

CN119786544AActive Publication Date: 2025-04-08JIANGSU HENGTRON NANOTECH CO LTD
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Patent Information

Application Number
CN202411943451.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-27
Publication Date
2025-04-08
Estimated Expiration
2044-12-27

AI Technical Summary

Technical Problem

Due to the introduction of manganese element, lithium manganese iron phosphate positive electrode material has reduced conductivity and reduced powder compaction density. Although existing modification methods such as nanoification and carbon coating can improve porosity and powder compaction gauge change, it is difficult to maintain the high-efficiency conductivity and good compaction density of the material at the same time.

Method used

The manganese phosphate positive electrode material is synthesized by high-speed nano ball mill assisted secondary sintering. The void ratio is reduced through secondary grinding and secondary sintering, and a carbon source is added during the sintering process to achieve good carbon coating.

Benefits of technology

It effectively improves the powder compaction density and conductivity of the material, while reducing the specific surface area, and maintaining the efficient electrochemical performance of the material.

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Abstract

The invention discloses a preparation method of a high-compaction lithium manganese iron phosphate positive electrode material, which comprises the following steps: placing a manganese source, an iron source and a phosphorus source in deionized water, stirring, carrying out primary high-speed ball milling, carrying out constant-temperature water bath, adding an oxidizing agent, stirring and oxidizing, and drying the slurry to obtain manganese iron phosphate precursor powder; carrying out primary sintering on the ferromanganese phosphate precursor powder to obtain a ferromanganese phosphate primary sintering material; putting the ferromanganese phosphate primary sintering material into deionized water, adding a lithium source and a carbon source at the same time, and performing stirring, secondary high-speed ball milling and drying to obtain lithium ferromanganese phosphate precursor powder; and carrying out secondary sintering on the lithium manganese iron phosphate precursor powder to obtain the high-compaction lithium manganese iron phosphate positive electrode material. The void ratio is well reduced and good carbon coating is realized by means of secondary grinding and secondary sintering, and compared with the prior art, the method has the advantages that good capacity can be maintained, the powder compaction density of the material can be improved, the conductivity can be improved, and the specific surface area of the material can be effectively reduced.
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