Journal of Energy Chemistry ›› 2022, Vol. 69 ›› Issue (6): 442-449.DOI: 10.1016/j.jechem.2022.01.032

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A comprehensive modification enables the high rate capability of P2-Na0.75Mn0.67Ni0.33O2 for sodium-ion cathode materials

Xiaochen Fenga,b,1, Yong Lia,1, Qinhao Shia, Xuan Wanga, Xiuping Yina, JingWangb, Zhonghong Xiaa,*, Haiyan Xiaob, Aibing Chenc, Xinxin Yangd,*, Yufeng Zhaoa,b,*   

  1. aInstitute for Sustainable Energy/College of Science, Shanghai University, Shanghai 200444, China;
    bKey Laboratory of Applied Chemistry, Yanshan University, Qinhuangdao 066004, Hebei, China;
    cCollege of Chemical and Pharmaceutical Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China;
    dSchool of Materials Science and Engineering, Shanghai University,Shanghai 200444, China
  • Received:2021-11-18 Revised:2022-01-21 Accepted:2022-01-24 Online:2022-06-15 Published:2022-10-25
  • Contact: * E-mail addresses: 10011493@shu.edu.cn (Z. Xia), yangxinxin@t.shu.edu.cn (X. Yang), yufengzhao@shu.edu.cn (Y. Zhao).
  • About author:1 These authors equally contributed to this work.

Abstract: The Na+/vacancy ordering can effectively affect the electrochemical behavior of P2-type cathode material. In this work we proposed an integrated strategy by attaining a high Na content, In3+ doping in conjunc-tion with NaInO2 coating in the P2-Na0.75Mn0.67Ni0.33O2 which can inhibit the sodium vacancy order, smooth the electrochemical curve, and enhance the structural stability and rate capability. A combination of X-ray diffraction analysis and DFT calculation indicate that the In3+ ions in the Na layer serve as ‘‘pil-lars” to stabilize the layered structure, especially for high current density charging. The P2-Na0.75Mn0.67Ni0.33In0.02O2 with an impressive sodium content exhibits a remarkable reversible capacity of 109.6 mAh g-1, superior rate capability capacity of 79.8 mAh g-1 at 20 C, and 85% capacity retention after 100 cycles at 5 C. This work demonstrates an efficient approach for the comprehensive optimization of sodium ion cathode materials.

Key words: Sodium-ion batteries, Cathode, P2-type layered oxides, In doping, DFT