期刊
JOURNAL OF ENERGY CHEMISTRY
卷 73, 期 -, 页码 542-548出版社
ELSEVIER
DOI: 10.1016/j.jechem.2022.06.016
关键词
Layered transition metal oxides; Jahn-Teller effect; In situ synchrotron X-ray diffraction; Phase transition
资金
- National Key R&D Program of China [2020YFA0406203]
- Shenzhen Science and Technology Innovation Commission [SGDX2019081623240948, JCYJ20200109105618137]
- Shenzhen Research Institute, City University of Hong Kong
- ECS scheme [CityU 21307019]
- DOE Office of Science [DE-AC02-06CH11357]
Iron- and manganese-based layered metal oxides have attracted attention as cathodes for sodium-ion batteries due to their low cost and high specific capacity. This study successfully doped titanium (Ti) into Na2/3Fe1/3Mn2/3O2 to suppress the Jahn-Teller effect and improve the cycling and rate performance of sodium-ion batteries.
Iron- and manganese-based layered metal oxides, as cathodes for sodium ion batteries, have received widespread attention because of the low cost and high specific capacity. However, the Jahn-teller effect of Mn3+ ions and the resulted unstable structure usually lead to continuously capacity decay. Herein, Titanium (Ti) has been successfully doped into Na2/3Fe1/3Mn2/3O2 to suppress the Jahn-Teller distortion and improve both cycling and rate performance of sodium ion batteries. In situ high-energy synchrotron X-ray diffraction study shows that Ti-doped compound (Na2/3Fe1/3Mn0.57Ti0.1O2) can maintain the single P2 phase without any phase transition during the whole charging/discharging process. Various electrochemical characterizations are also applied to explore the better kinetics of sodium ions transfer in the Na2/3Fe1/3Mn0.57Ti0.1O2. This work provides a comprehensive insight into the Ti-doping effects on the performance from both structural and electrokinetic perspectives. (C) 2022 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
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