Issue 29, 2023

Ion exchange to construct a high-performance core–shell MnFe-PB@CuFe-PB cathode material for sodium ion batteries

Abstract

Sodium manganese hexacyanoferrate (MnFe-PB) is a promising cathode material for sodium-ion batteries because of its advantages of high operating voltage and high theoretical capacity. However, the structural phase transition of MnFe-PB during the working process will cause the Jahn–Teller effect, which destroys the stability of the interface and the structure of the material. Considering these factors, it is necessary to build a stable interface on the surface of MnFe-PB to keep the structure stable by using low-cost materials in a simple way for commercial applications. In this work, an ion exchange method is used to form a uniform coating layer of sodium copper hexacyanoferrate (CuFe-PB) on the surface of MnFe-PB. The existence of the coating layer effectively prevents Mn from dissolving into the electrolyte, inhibits the Jahn–Teller effect, and alleviates structural collapse. In 200 cycles at 0.1C, MnFe-PB@CuFe-PB maintains a capacity of 119.3 mA h g−1, 87.3% more than that of MnFe-PB. This simple and cheap ion exchange method for constructing a stable coating on MnFe-PB can well meet the actual demand of large-scale industrial production.

Graphical abstract: Ion exchange to construct a high-performance core–shell MnFe-PB@CuFe-PB cathode material for sodium ion batteries

  • This article is part of the themed collection: #MyFirstJMCC

Supplementary files

Article information

Article type
Communication
Submitted
16 3 2023
Accepted
08 7 2023
First published
10 7 2023

J. Mater. Chem. C, 2023,11, 9787-9793

Ion exchange to construct a high-performance core–shell MnFe-PB@CuFe-PB cathode material for sodium ion batteries

H. Cheng, Y. Liu, Z. Yu, Y. Song, Y. Qin, M. Zhang, R. Chen, J. Zhou, Y. Liu and B. Guo, J. Mater. Chem. C, 2023, 11, 9787 DOI: 10.1039/D3TC00947E

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