Enhanced performance of core–shell structured sodium manganese hexacyanoferrate achieved by self-limiting Na+ –Cs+ ion exchange for sodium-ion batteries

Sodium manganese hexacyanoferrate (NaMnHCF) is a promising cathode material for sodium-ion batteries (SIBs) due to its low cost and high energy density. The Jahn–Teller effect of Mn, however, leads to the poor structural stability of NaMnHCF, resulting in undesired electrochemical performance. Herei...

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Bibliographic Details
Published in:Rare metals 2022-11, Vol.41 (11), p.3740-3751
Main Authors: Guo, Yan-Dong, Jiang, Ji-Cheng, Xie, Jian, Wang, Xin, Li, Jing-Ze, Wang, Dong-Huang, Zhou, Ai-Jun
Format: Article
Language:English
Subjects:
Biomaterials
Cathodes
Cesium ions
Chemistry and Materials Science
Core-shell structure
Crystal structure
Electrochemical analysis
Electrode materials
Energy
Ion exchange
Jahn-Teller effect
Liquid-solid interfaces
Manganese
Materials Engineering
Materials Science
Metallic Materials
Nanoscale Science and Technology
Original Article
Performance enhancement
Physical Chemistry
Sodium
Sodium-ion batteries
Structural stability
Surface layers
Thickness
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Summary:Sodium manganese hexacyanoferrate (NaMnHCF) is a promising cathode material for sodium-ion batteries (SIBs) due to its low cost and high energy density. The Jahn–Teller effect of Mn, however, leads to the poor structural stability of NaMnHCF, resulting in undesired electrochemical performance. Herein, we developed a novel coating strategy and obtained a core–shell structured NaMnHCF through facile Na + –Cs + ion exchange, which naturally produced a robust and insoluble Cs-rich surface layer (CsMnHCF) with several nanometers in thickness on pristine NaMnHCF. It is shown that the Cs-rich surface plays a positive role in the stability of the NaMnHCF structure by prohibiting the leakage of crystal water, stabilizing the solid–liquid interfaces, and solidifying crystal structure. The electrochemical performance of the core–shell NaMnHCF is dramatically improved with a discharge capacity of 76.3 mAh·g −1 after 1000 cycles at 1.0C and a reversible capacity of 87.0 mAh·g −1 at 10.0C, which is much superior to that of the pristine NaMnHCF with only 26.6 mAh·g −1 after 400 cycles and 31 mAh·g −1 at 10.0C. This work reports a new method for the synthesis of core–shell NaMnHCF and provides a novel perspective for the development of advanced NaMnHCF cathode for SIBs. Graphical abstract
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-022-02068-0