1. Improved electrochemical properties of vanadium substituted Na0·67Fe0·5Mn0·5O2 cathode material for sodium-ion batteries.
- Author
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Sui, Yulei, Hao, Yueying, Zhang, Xiaoping, Li, Jiangpeng, Wen, Gongyu, Zhong, Shengkui, Zhang, Ziwei, and Wu, Ling
- Subjects
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SODIUM ions , *TRANSITION metal oxides , *VANADIUM , *ELECTRIC batteries , *ELECTROCHEMICAL electrodes , *CRYSTAL morphology , *ENERGY density , *CATHODES - Abstract
Layered transition metal oxide Na 0·67 Fe 0·5 Mn 0·5 O 2 is considered as a promising cathode material of sodium-ion batteries because of its naturally elemental abundance and high energy density. However, low rate capability and poor structural reversibility of Na 0·67 Fe 0·5 Mn 0·5 O 2 greatly hinder its large scale application. In this study, V-substituted Na 0·67 Fe 0·5 Mn 0·5 O 2 cathode material with improved electrochemical performance is successfully synthesized via a sol-gel method. The effects of V-substitution on chemical composition, crystal structure and morphology of Na 0·67 Fe 0·5 Mn 0·5 O 2 are studied in detail. Furthermore, modification mechanisms on the improved electrochemical performance by V-substitution are investigated. The results demonstrate that the rate capability and cycle stability of Na 0·67 Fe 0·5 Mn 0·5 O 2 cathode material is significantly elevated by V-substitution. And the enhanced electrochemical properties are mainly attributed to the improved Na+ diffusion rate and structural reversibility. This study suggests that introducing V ions into the lattice of Na 0·67 Fe 0·5 Mn 0·5 O 2 crystals is a favorable strategy to improve its electrochemical properties. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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