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Zhang H, Xiang Y, Liu B, Li G, Dun C, Huang H, Zou Q, Xiong L, Wu X. Fe doping mechanism of Na 0.44MnO 2 tunnel phase cathode electrode in sodium-ion batteries. J Colloid Interface Sci 2024; 661:389-400. [PMID: 38306748 DOI: 10.1016/j.jcis.2024.01.165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 01/21/2024] [Accepted: 01/24/2024] [Indexed: 02/04/2024]
Abstract
Due to its stability and low cost, the tunnel-style sodium-manganese oxide (Na0.44MnO2) material is deemed a popular cathode choice for sodium-ion rechargeable batteries. However, the Jahn-Teller effect caused by Mn3+ in the material results in poor capacity and cycling stability. The purpose of this experimental study is to partially replace Mn3+ with Fe3+, in order to reduce the Jahn-Teller effect of the material during charging and discharging process. The results of Raman spectroscopy and X-ray photoelectron spectroscopy confirmed that the content of Mn3+ decreased after Fe3+ doping. Electrochemical studies show that the Na0.44Mn0.994Fe0.006O2 cathode has better rate performance (exhibits a reversible capacity of 87.9 mAh/g at 2 C) and cycle stability in sodium-ion batteries. The diffusion coefficient of sodium ions increases by Fe3+ doping. The excellent rate performance and capacity improvement are verified by density functional theory (DFT) calculation. After doping, the band gap decreases significantly, and the results show that the state density of O 2p increases near the Fermi level, which promotes the oxidation-reduction of oxygen. This work provides a straightforward approach to enhance the performance of Na0.44MnO2 nanorods, and this performance improvement has guiding significance for the design of other materials in the energy storage domain.
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Affiliation(s)
- Huiyu Zhang
- College of Physics and Electromechanical Engineering, Jishou University, Jishou 416000, Hunan, China
| | - Yanhong Xiang
- College of Physics and Electromechanical Engineering, Jishou University, Jishou 416000, Hunan, China.
| | - Baocheng Liu
- College of Physics and Electromechanical Engineering, Jishou University, Jishou 416000, Hunan, China
| | - Guang Li
- College of Physics and Electromechanical Engineering, Jishou University, Jishou 416000, Hunan, China
| | - Chen Dun
- College of Physics and Electromechanical Engineering, Jishou University, Jishou 416000, Hunan, China
| | - Haoyu Huang
- College of Physics and Electromechanical Engineering, Jishou University, Jishou 416000, Hunan, China
| | - Qiuling Zou
- College of Physics and Electromechanical Engineering, Jishou University, Jishou 416000, Hunan, China
| | - Lizhi Xiong
- School of Pharmaceutical Sciences, Jishou University, Jishou 416000, Hunan, China
| | - Xianwen Wu
- College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, Hunan, China
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