A battery cell, a method for manufacturing the same, a battery, and an electric device

By controlling the mass ratio of sodium iron pyrophosphate, sodium ferrous phosphate, and sodium iron pyrophosphate, optimizing the shape and particle size of the positive electrode active material, and combining it with an ester-based electrolyte, the capacity and cycle life problems caused by impurities in the preparation process of sodium iron pyrophosphate positive electrode material were solved, resulting in a battery cell with high energy density and long cycle life.

CN122118033APending Publication Date: 2026-05-29CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
Filing Date
2024-11-29
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

The impurity phases sodium ferrous phosphate and sodium ferric phosphate generated during the preparation of existing sodium iron pyrophosphate cathode materials affect the specific capacity and cycle life of the battery, resulting in poor energy density and cycle performance.

Method used

By controlling the mass ratio of sodium iron pyrophosphate, sodium ferrous phosphate, and sodium iron pyrophosphate in the active material, and by using spherical positive electrode active material and carbon coating with a specific particle size range, combined with ester-based electrolyte, the composition and preparation process of the battery cell are optimized.

Benefits of technology

It improves the compaction density and charge/discharge specific capacity of the positive electrode active material, thereby enhancing the energy density and cycle performance of the battery cell. In particular, by increasing the mass ratio of sodium iron pyrophosphate in the active material to that of sodium ferrous phosphate, the energy density and cycle performance of the battery are further improved.

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Abstract

The application provides a battery monomer, a preparation method thereof, a battery and a power utilization device, and belongs to the technical field of sodium batteries. The battery monomer comprises a positive electrode sheet, the positive electrode sheet comprises a positive electrode film layer, the positive electrode film layer comprises an active substance, the active substance comprises 96-99 wt% of sodium iron pyrophosphate phosphate, 0-1.9 wt% of sodium ferrous phosphate and 0.6-4 wt% of sodium iron pyrophosphate, and the mass ratio of sodium iron pyrophosphate in the active substance is greater than the mass ratio of sodium ferrous phosphate. The battery monomer of the application controls the content of the main phase and the impurity phase in the active substance in the above range, which can not only improve the compaction density of the positive electrode active material, but also is beneficial to improving the compaction density of the positive electrode sheet, and can improve the charge gram capacity and the discharge gram capacity of the positive electrode active material. When the mass ratio of sodium iron pyrophosphate in the active substance is greater than the mass ratio of sodium ferrous phosphate in the active substance, the energy density and the cycle performance of the battery monomer can be further improved.
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