Preparation method of sodium iron phosphate pyrophosphate positive electrode material with double-layer carbon structure

By using a bilayer carbon structure preparation method, the problem of low ionic conductivity in NFPP materials was solved, improving the material's cycle performance and conductivity, and thus enhancing the battery's electrical performance.

CN119079962BActive Publication Date: 2026-07-24湖南鹏博新材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
湖南鹏博新材料有限公司
Filing Date
2024-08-27
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

The low ionic conductivity of sodium iron pyrophosphate (NFPP), an existing cathode material for sodium-ion batteries, limits its application in the field of two-wheeled vehicles.

Method used

A double-layer carbon structure preparation method is adopted, in which a high molecular polymer is first sprayed to form an inner carbon layer, and a low molecular weight organic material is sprayed to form an outer carbon layer, forming a multi-coating effect, which improves the phase stability and ionic conductivity of the material.

Benefits of technology

It improves the cycle performance and ionic conductivity of sodium iron pyrophosphate cathode material, enhances the electron transport channels between materials, strengthens conductivity, extends the discharge plateau, and improves the battery's electrical performance.

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Abstract

The application provides a preparation method of a sodium iron phosphate pyrophosphate positive electrode material with a double-layer carbon structure. Different carbon sources are used for coating to form double-layer carbon layers, and the different carbon layers have different structure types, so that the material has higher phase stability and excellent ion conductivity. Specifically, a secondary spraying method is used, a high-molecular polymer is coated to form an inner carbon layer in the first spraying, and an organic low-molecular is coated to form an outer carbon layer in the second spraying, so that the effect of multiple coatings is achieved. The dense and compact inner carbon layer can avoid excessive side reactions between the electrolyte and the positive electrode material, thereby improving the cycle performance. The outer carbon layer is used for supplementing the defects of the inner carbon layer, further preventing the contact of the electrolyte, and simultaneously serving as an ion transmission channel between particles to improve the conductivity.
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