A self-supporting electrode and a method of manufacturing and use thereof

The synthesis of composite sodium iron phosphate self-supporting electrodes by plasma-assisted sintering technology solves the problems of high energy consumption and low load in traditional processes, realizing efficient and low-cost preparation of self-supporting electrodes and improving the energy density and production efficiency of sodium-ion batteries.

CN122436435APending Publication Date: 2026-07-21SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
Filing Date
2026-05-12
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing processes for preparing composite sodium iron phosphate cathode materials suffer from high energy consumption, low efficiency, low loading capacity, and limited energy density. Furthermore, self-supporting electrode technology struggles to achieve efficient coupling between efficient synthesis and electrode forming.

Method used

Plasma-assisted sintering technology is used to directly press sodium, iron, phosphorus and carbon sources together to form a composite sodium iron phosphate active material at low temperature by using high-energy active particles generated by plasma, and forming a conductive carbon network in situ, thus realizing the integrated preparation of self-supporting electrodes.

Benefits of technology

It significantly improves the loading of active materials and the energy density of batteries, simplifies the preparation process, reduces energy consumption and production costs, and enhances electrochemical performance.

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Abstract

The application relates to the technical field of electrode materials, and discloses a self-supporting electrode as well as a preparation method and application thereof. The self-supporting electrode comprises an active substance and conductive carbon; the active substance is composite sodium iron phosphate, the composite sodium iron phosphate is in-situ compounded with the conductive carbon to form an integrated structure; and the loading amount of the composite sodium iron phosphate in the self-supporting electrode is 40-50 mg / cm 2 . The self-supporting electrode does not need a current collector and a binder, the active substance loading amount is far higher than 5-10 mg / cm 2 of a traditional coating process, the porosity can be controlled in the range of 8%-25%, the surface capacity of the electrode and the energy density of the battery are significantly improved, the self-supporting electrode has good wettability with electrolyte, the specific capacity of a soft-pack sodium ion battery assembled by using the self-supporting electrode can reach 125.3 mAh / g at a current of 100 mA / g, the mass energy density reaches 376.7 Wh / kg, and the capacity retention rate exceeds 81% at a high rate of 500 mA / g.
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