Sodium ferric sulfate positive plate, dry preparation method thereof and sodium ion battery

By rapidly mixing carbon-coated sodium ferric sulfate particles with a conductive agent and performing fiberization, combined with rolling under low humidity conditions, the conductivity and strength issues of sodium ferric sulfate cathode materials were solved, achieving efficient and environmentally friendly dry electrode preparation and improving battery performance.

CN122117816APending Publication Date: 2026-05-29CHAOWEI POWER GROUP CO LTD
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Patent Information

Application Number
CN202610054115.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-15
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing technologies make it difficult to construct an efficient three-dimensional conductive network in sodium ferric sulfate cathode materials. Furthermore, in dry electrode processes, it is difficult for sodium ferric sulfate particles and PTFE binders to form a strong bond, resulting in poor electrode strength. In addition, traditional processes are time-consuming, energy-intensive, and environmentally unfriendly.

Method used

Carbon-coated sodium ferric sulfate particles are mixed with a positive electrode conductive agent at high speed to form a core-shell structure. After being mixed with a positive electrode binder, the mixture is subjected to high-speed shearing and fiberization treatment. Combined with rolling under low humidity conditions, a self-supporting positive electrode film is formed, ensuring conductivity and strength.

Benefits of technology

The conductivity and mechanical strength of the sodium ferric sulfate positive electrode were improved, water sensitivity issues were avoided, production costs were reduced, and electrochemical performance was improved.

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Abstract

The invention discloses a dry preparation method of a sodium ferric sulfate positive plate, which comprises the following steps: mixing carbon-coated sodium ferric sulfate particles with a positive conductive agent at a high speed, mixing the obtained compound with a positive binder, and carrying out fibrosis treatment under high-speed shearing to prepare a dry electrode mixture; rolling and calendering the dry electrode mixture to obtain a positive electrode membrane; the carbon-coated sodium ferric sulfate particles are formed by grading large particles with D50 of 5-10 microns and fine particles with D50 of 0.5-2 microns according to the mass ratio of 7: 3-9: 1. According to the method, pre-compounding and grain size distribution are adopted, the conductive agent is pre-compounded firstly, and then the binder is fiberized, so that controllable fibration is ensured, and the whole-course low-humidity environment is 1t; the prepared positive pole piece is low in resistance, high in strength and free of powder falling, has high electron / ion conductivity, high mechanical strength and good interface characteristics, and is remarkably superior to a sodium ferric sulfate electrode prepared by a traditional wet process in electrochemical performance (capacity, rate and cycle life).
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