J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (7): 1250-1254.DOI: 10.1016/j.jmst.2019.01.010

• Orginal Article • Previous Articles     Next Articles

Triple effects of Sn-substitution on Na0.67Ni0.33Mn0.67O2

Xiaohui Rongabc, Fei Gaoa, Feixiang Dingbc, Yaxiang Lub*(), Kai Yanga, Hong Lib, Xuejie Huangb, Liquan Chenb, Yong-Sheng Hub   

  1. aState Key Laboratory of Operation and Control of Renewable Energy and Storage Systems, China Electric Power Research Institute, Beijing 100192, China
    bKey Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
    cCenter of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100190, China
  • Received:2018-11-05 Revised:2018-12-20 Accepted:2018-12-30 Online:2019-07-20 Published:2019-06-20
  • Contact: Lu Yaxiang
  • About author:

    1These authors contributed equally to this work.

Abstract:

Layered oxides are one of the most promising cathode materials for sodium ion batteries (NIBs), however, the relatively low working voltage hinders the increase of energy density thus limiting the application scenarios of NIBs. Here we prepared and investigated a series of Sn4+ substituted Na0.67Ni0.33Mn0.67-xSnxO2 (x = 0.10, 0.20, 0.30, 0.33) and found that Sn-substitution can induce three effects: promoting O3-stack formation, smoothing the voltage profile and increasing the working voltage to ~3.6 V. This study would enrich the knowledge of Sn-substitution and give guide to the better design of high-voltage cathode materials for NIBs.

Key words: Sodium-ion batteries, Layered oxide cathode, Tin-based, Cathode