A High-Temperature $\beta$-Phase NaMnO$_{2}$ Stabilized by Cu Doping and Its Na Storage Properties
Li-Wei Jiang1,2 , Ya-Xiang Lu1** , Yue-Sheng Wang1 , Li-Lu Liu1,2 , Xing-Guo Qi1,2 , Cheng-Long Zhao1,2 , Li-Quan Chen1 , Yong-Sheng Hu1,2**
1 Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 1001902 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049
Abstract ：The high-temperature $\beta$-phase NaMnO$_{2}$ is a promising material for Na-ion batteries (NIBs) due to its high capacity and abundant resources. However, the synthesis of phase-pure $\beta$-NaMnO$_{2}$ is burdensome and cost-ineffective because it needs to be sintered under oxygen atmosphere at high temperature and followed by a quenching procedure. Here we first report that the pure $\beta$ phase can be stabilized by Cu-doping and easily synthesized by replacing a proportion of Mn with Cu via a simplified process including sintering in air and cooling to room temperature naturally. Based on the first-principle calculations, the band gap decreases from 0.7 eV to 0.3 eV, which indicates that the electronic conductivity can be improved by Cu-doping. The designed $\beta$-NaCu$_{0.1}$Mn$_{0.9}$O$_{2}$ is applied as cathode in NIBs, exhibiting an energy density of 419 Wh/kg and better performance in terms of rate capability and cycling stability than those in the undoped case.
收稿日期: 2018-03-01
出版日期: 2018-03-13
:
88.80.ff
(Batteries)
82.47.Aa
(Lithium-ion batteries)
71.20.-b
(Electron density of states and band structure of crystalline solids)
68.55.Nq
(Composition and phase identification)
引用本文:
. [J]. 中国物理快报, 2018, 35(4): 48801-048801.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/35/4/048801
或
https://cpl.iphy.ac.cn/CN/Y2018/V35/I4/48801
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2018, Vol. 35 
