Fe-substituted Mn-based Prussian white as cathode for high-performance potassium-ion battery

• Published in: Journal of materials science Vol. 57; no. 29; pp. 14015 - 14025
• Main Authors: Chen, Xuanjin, Xia, Yang, Fang, Xiangpeng, Zhang, Kaicheng, Xiong, Yuli, Jian, Zelang
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-08-2022; Springer; Springer Nature B.V
• Subjects: Batteries; Cathodes; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Crystal structure; Crystallography and Scattering Methods; Crystals; Dimensional stability; Electrochemical analysis; Electrode materials; Energy Materials; Frame structures; Ion migration; Manganese; Materials Science; Materials substitution; Polymer Sciences; Potassium; Rechargeable batteries; Solid Mechanics; Structure
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-022-07430-2

Prussian white (PW) has a stable three-dimensional frame structure and large ion migration channels, which has been widely studied as the cathode materials for potassium-ion batteries (PIB) in recent years. The multi-composition in PWs has a great impact on the electrochemical performance as cathode materials. In this work, we investigated the relationship between Fe substitution content and electrochemical properties. The sample of PW with 10%Fe substitution shows the overall optimum electrochemical performance, which delivers a high reversible capacity of 124.3 mAh g
−1
and capacity retention of 70.0% after 200 cycles at 100 mA g
−1
, as well as 77.5 mAh g
−1
at a large current density of 500 mA g
−1
. Actually, partial Fe substitution could effectively stabilize the lattice structure and improve electrochemical properties. This work provides a practical strategy to synthesize PWs with stable crystal structure and preferable performance, which could serve as a reference for the electrochemical improvement of electrode materials.
Graphical Abstract