期刊
JOURNAL OF ENERGY CHEMISTRY
卷 68, 期 -, 页码 564-571出版社
ELSEVIER
DOI: 10.1016/j.jechem.2021.12.018
关键词
Na-ion battery; NaNi(1/3)Mn(1/3)Fe(1/3)O(2 & nbsp;)cathode ; Interphase structure; Zr doping; Surface interface modification
资金
- University of Chinese Academy of Sciences
- Scientific Instrument Developing Project of the Chinese Academy of Sciences [ZDKYYQ20170001]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515111025]
- Japan Synchrotron Radiation Research Institute [2019B1096]
In this study, a Zr-doped interphase structure was designed to improve the electrochemical properties of O3-type layered cathodes for Na-ion batteries. The modified cathode exhibited a stable Na-storage structure and enhanced rate/cycle capability, attributed to the enlarged Na layer spacing in the Zr-doped interphase structure.
Na-based layered transition metal oxides with O3-type structure have been considered to be promising cathodes for Na-ion batteries. However, the intrinsically limited Na-ion conductivity induced by the O-type Na-coordinate environment compromises their rate and cycle capability, hindering their practical application. Here, we report an interphase-structure tailoring strategy that improves the electrochemical properties of O3-type layered cathodes achieved through surface coating and doping processes. Specifically, a Zr-doped interphase structure is designed in the model compound NaNi1/3Mn1/3Fe1/3O2 using the ionic conductor Na3Zr2Si2PO12 as the surface coating material and Zr-dopant provider. We discover that the modified NaNi1/3Mn1/3Fe1/3O2 cathode shows a stable Na-storage structure as well as an enhanced rate/cycle capability. Combined with theoretical calculations, it is suggested that the superior electrochemical performances originate from the Zr-doped interphase structure, which has an enlarged Na layer spacing that forms favorable Na-ion diffusion channels. This work highlights a general material interface optimization method which opens a new perspective for fabricating high-performance electrodes for Na-ion batteries and beyond. (C)& nbsp;2021 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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