Preparation method of Na4Fe3(PO4)2P2O7 positive electrode material and application thereof

By employing a preparation process that involves adjusting pH value with dual reagents and compensating for sodium content, combined with sand milling, spray drying, and segmented sintering, micro- and nano-sized Na4Fe3(PO4)2P2O7 cathode materials were prepared. This solved the problems of kinetic performance and structural stability of NFPP, and realized a sodium-ion battery cathode material with high rate performance and long life.

CN122186990APending Publication Date: 2026-06-12TONGXING HAOSHENG (YIBIN) NEW ENERGY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TONGXING HAOSHENG (YIBIN) NEW ENERGY TECHNOLOGY CO LTD
Filing Date
2026-04-07
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

The existing sodium-ion battery cathode material NFPP has limited kinetic performance, large particle size and uneven distribution, making it difficult to balance specific surface area and structural stability, which affects high-rate charge and discharge performance and cycle life.

Method used

A preparation method using ammonia and sodium hydroxide as dual reagents to adjust the pH value in stages and compensate for sodium content, combined with sand milling, spray drying granulation and staged sintering, forms micro-nano Na4Fe3(PO4)2P2O7 cathode material, and a carbon coating layer is formed on its surface to enhance electron transport channels.

Benefits of technology

It significantly improves the rate performance and structural stability of the material, shortens the sodium ion insertion/extraction path, reduces electrochemical polarization, ensures that the structure does not collapse during long cycles, and enhances the material's reaction kinetics and cycle life.

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Abstract

The application relates to the technical field of sodium ion battery polyanion positive electrode materials, and discloses a preparation method and application of a Na4Fe3(PO4)2P2O7 positive electrode material, which comprises the following steps: S1, preparing a precursor slurry; S2, pH two-reagent segmented adjustment; S3, sodium amount compensation and accurate matching; S4, drying and granulating; and S5, sintering. Through the two-reagent strategy of introducing ammonia water coarse adjustment and sodium hydroxide fine adjustment, the application effectively avoids local supersaturation and iron source early hydrolysis caused by single strong alkali adjustment, cooperates with a sodium amount dynamic compensation mechanism, eliminates the interference of NaOH introduction on the stoichiometric ratio, fundamentally inhibits the generation of impurities, and improves the purity of the material.
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