Phosphate-based positive electrode material, preparation method and application thereof

By coating low-disorder carbon materials and doping them with high-valence metal elements and Li-site elements into phosphate-based cathode materials, the problems of low conductivity and Fe and Mn ion dissolution were solved, thereby improving the kinetic and electrochemical performance of lithium batteries.

CN118738336BActive Publication Date: 2026-06-02EVE POWER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
EVE POWER CO LTD
Filing Date
2024-06-28
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing phosphate-based cathode materials suffer from low conductivity, poor ion diffusion performance, poor rate performance and low-temperature performance, and the dissolution of Fe and Mn ions leads to a decrease in the self-discharge rate and cycle performance of lithium batteries.

Method used

By coating the surface of matrix particles with low-disorder carbon materials and doping high-valence metal elements at M sites and Mg and Zr elements at Li sites, local lithium vacancies are formed and lithium layer channels are expanded, thereby improving ionic conductivity and electrochemical activity, while inhibiting the dissolution of Fe and Mn ions.

Benefits of technology

It significantly improves the rate performance, low-temperature performance and cycle performance of phosphate-based cathode materials, reduces the dissolution rate of Fe and Mn ions, and enhances the self-discharge rate and storage performance of lithium batteries.

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Abstract

The application specifically discloses a phosphate-based positive electrode material and a preparation method and application thereof. The phosphate-based positive electrode material comprises base particles and a carbon coating layer coated on the surface of the base particles; the chemical formula of the base particles is Li x M y PO4, 0.96≤x≤1.08, 0.96≤y≤1, M comprises at least one of Fe and Mn; wherein, the M site is doped with a first metal element, the first metal element comprises at least one of Ti, V, Cr, Co, Ni, Nb, Mo and W; and / or, the Li site is doped with a second metal element, the second metal element comprises at least one of Mg and Zr; the carbon coating layer comprises a carbon material, and the degree of disorder I D / I G of the carbon material is ≤1.2. The application has the advantages of improving the electrochemical performance of the phosphate-based positive electrode material and reducing the ion elution rate thereof.
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Citation Information

Patent Citations

  • Titanium and zirconium co-doped carbon-coated lithium iron phosphate material as well as preparation method and application thereof

    CN114314548A

  • Positive electrode material and preparation method thereof, positive electrode plate and secondary battery

    CN115714171A

Cited By

  • Phosphate-based positive electrode material, and preparation method therefor and use thereof

    EP4773230A1

  • Phosphate-based positive electrode material, and preparation method therefor and use thereof

    WO2026000898A1