Preparation method of high entropy Prussian blue analog material CuCoNiCrMn-PBA

CuCoNiCrMn-PBA, a high-entropy Prussian blue analog material prepared by coprecipitation method and Oswald's maturation process, solved the problem of poor circulation stability of existing sodium ion battery positive electrode materials, achieved high specific capacity and excellent circulation stability, and was suitable for sodium ion battery positive electrode materials.

CN119284924BActive Publication Date: 2025-03-18SANYA SCI & EDUCATION INNOVATION PARK WUHAN UNIV OF TECH
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Patent Information

Application Number
CN202411836619.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-13
Publication Date
2025-03-18
Estimated Expiration
2044-12-13

AI Technical Summary

Technical Problem

Due to the Jahn-Teller effect of transition metal elements, the existing sodium ion battery positive electrode materials have poor cycle stability, making it difficult to achieve high specific capacity and stable electrochemical performance.

Method used

Using co-precipitation method and Oswald's maturation process, a high-entropy Prussian blue analog material CuCoNiCrMn-PBA was prepared by using a variety of transition metal sulfates and sodium ferrocyanide as raw materials, combined with sodium citrate and ascorbic acid, which inhibited the Jahn-Teller effect of the Mn element and formed an open and stable framework structure.

Benefits of technology

It achieves high specific capacity and excellent cycle stability, is easy to operate, has high safety and high yield, and is suitable for sodium ion battery positive electrode materials.

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Abstract

The invention discloses a preparation method of a high entropy Prussian blue analog material CuCoNiCrMn-PBA. The invention dissolves copper salt, cobalt salt, nickel salt, chromium salt, manganese salt and sodium citrate in deionized water, and simultaneously drops the above solution and sodium ferrocyanide salt solution into the deionized water, a coprecipitation reaction occurs, ascorbic acid is added after the coprecipitation is completed, and an Oswald ripening process is performed to obtain a high entropy Prussian blue analog material. The material has a high discharge specific capacity, good cycle stability and excellent rate performance when used as a positive active material for a sodium ion battery. The invention synthesizes a high entropy Mn-based Prussian blue analog material in which a plurality of elements are coordinated with N atoms, and a plurality of transition metal elements suppress the Jahn-Teller effect of the Mn element while providing capacity, and have an open and stable framework structure, and the method has the advantages of simple operation, high safety and high yield.
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