Controllable particle size distribution of lithium iron phosphate nanomaterial and preparation method thereof

By optimizing the formulation and preparation process of lithium iron phosphate materials, and using components such as Mg2+, La3+, Zn2+ and citric acid, combined with porous carbon nanospheres and sodium alginate, a thermal barrier structure is formed, which solves the problems of uneven particle size distribution and unstable performance, and improves particle size uniformity and thermal stability.

CN120774396BActive Publication Date: 2026-06-19ZHONGKE LITHIUM BATTERY NEW ENERGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHONGKE LITHIUM BATTERY NEW ENERGY CO LTD
Filing Date
2025-07-14
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing lithium iron phosphate materials suffer from uneven particle size distribution, complex synthesis processes, and unstable performance, which limits their performance in high-power, high-speed charge and discharge applications.

Method used

By optimizing the formulation and preparation process, a combination of Mg2+, La3+, Zn2+ and citric acid is used to control grain growth. Combined with porous carbon nanospheres, urea and sodium alginate, a thermal barrier structure is formed to precisely control the particle size distribution. Particle size uniformity is achieved through segmented sintering and laser particle size monitoring.

Benefits of technology

Precise control of particle size distribution was achieved, which improved the electrochemical performance and thermal stability of the material and ensured that the structural integrity was maintained under high-rate charge and discharge conditions.

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Abstract

This invention provides a lithium iron phosphate nanomaterial with controllable particle size distribution and its preparation method. By precisely controlling the formulation and process conditions, a lithium iron phosphate nanomaterial with a particle size distribution concentrated in the range of 200–400 nm is obtained. Its main components include iron phosphate, lithium carbonate, magnesium nitrate, lanthanum nitrate, zinc nitrate, citric acid, urea, porous carbon nanospheres, and water. A high-temperature solid-state reaction method is employed, and the particle size distribution of the material is controlled by adjusting the temperature and atmosphere during the sintering process. Simultaneously, a laser particle size online monitoring device is used to regulate the heating rate, ensuring that the particle size fluctuation does not exceed 10%. The lithium iron phosphate nanomaterial provided by this invention exhibits a high specific surface area and good cycle stability.
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