Modified ferric sodium pyrophosphate positive electrode material as well as preparation method and application thereof

By combining carbon and sodium ion conductors on the surface and grain boundary of the positive electrode material of sodium ferric pyrophosphate, a three-dimensional conductive network is formed, which solves the problems of low conductivity and poor diffusion, significantly improves the charge transfer rate and structural stability of the material, and improves the rate performance.

CN119650674AActive Publication Date: 2025-03-18CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Patent Information

Application Number
CN202510167930.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-17
Publication Date
2025-03-18
Estimated Expiration
2045-02-17

AI Technical Summary

Technical Problem

The electron conductivity of sodium ferric pyrophosphate positive electrode material is low and the sodium ion diffusivity is poor, resulting in large polarization of the charge and discharge process and relatively poor rate performance, which cannot meet the needs of fast charge and discharge.

Method used

By uniformly combining carbon and sodium ion conductors on the surface and grain boundaries of sodium ferric pyrophosphate positive electrode material, a three-dimensional conductive network is formed, the charge transfer rate is improved, and the precursor is prepared by spray drying to control the uniform morphology and structural stability of the material.

Benefits of technology

The charge transfer rate of the positive electrode material is significantly improved, the structural stability of the material is enhanced, the cycle performance and rate performance are improved, so that it can meet the needs of fast charging and discharging.

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Abstract

The invention provides a modified ferric sodium phosphate pyrophosphate positive electrode material and a preparation method and application thereof, the modified ferric sodium phosphate pyrophosphate positive electrode material comprises a ferric sodium phosphate pyrophosphate positive electrode material and a carbon and sodium ion conductor, the carbon and sodium ion conductor is enriched on the surface and grain boundary of the ferric sodium phosphate pyrophosphate positive electrode material in a uniform composite phase, and the sodium ion conductor is NaxMOy. A composite phase material formed by carbon and a sodium ion conductor is used for coating primary particles and secondary particles of the positive electrode material, a three-dimensional conductive / conductive ion network is formed on the grain boundary and the surface of the material, and the charge and ion transmission rate of the material is high; and the three-dimensional coating layer can protect the material from being eroded by electrolyte, the structure stability is good, and the cycle performance and the rate performance of the material are excellent.
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