Preparation method of carbon-coated modified prussian blue positive electrode material, sodium battery positive electrode and sodium ion battery

By forming a carbon coating layer on the surface of Prussian blue cathode material through low-temperature carbonization technology, the problem of metal ion dissolution is solved, the electrochemical performance and rate performance of the battery are improved, and the application scenarios of high power are broadened.

CN122291441APending Publication Date: 2026-06-26湖州超钠新能源科技有限公司
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Patent Information

Application Number
CN202411931765.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-26
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

The dissolution of metal ions during the charging and discharging process of Prussian blue sodium-based cathode materials leads to a decrease in battery safety performance and a shortened cycle life. Traditional high-temperature calcination technology cannot be applied, which limits its widespread use.

Method used

Low-temperature carbonization technology is used to mix Prussian blue cathode material with carbon-containing compounds such as cyclodextrin or malic acid, and then carbonize it at low temperature in an inert atmosphere to form a carbon coating layer, which inhibits the dissolution of metal ions.

Benefits of technology

It effectively inhibits the dissolution of metal ions, improves the electrochemical performance and rate performance of the battery, and broadens the application scenarios for high power.

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Abstract

This invention discloses a method for preparing carbon-coated modified Prussian blue cathode material, a sodium-ion battery cathode, and a sodium-ion battery. The method for preparing the modified Prussian blue cathode material includes: uniformly mixing a Prussian blue cathode matrix material with a carbon-containing compound, and then carbonizing it at a low temperature under an inert atmosphere to obtain the carbon-coated modified Prussian blue cathode material; wherein the carbonization temperature is 150℃~280℃, the carbon-containing compound is selected from at least one of cyclodextrin and malic acid, and the amount of carbon-containing compound added is 0.2wt%~5wt% of the Prussian blue cathode matrix material based on carbon content. The low-temperature coating technology achieves carbon coating of the Prussian blue cathode matrix material, which not only successfully inhibits the dissolution of metal ions such as iron and manganese, thereby improving the electrochemical performance of the material, but also significantly improves the rate performance and cycle performance of the battery, broadening its application scenarios in high-power applications.
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