Energy Storage Science and Technology ›› 2022, Vol. 11 ›› Issue (9): 2980-2988.doi: 10.19799/j.cnki.2095-4239.2022.0213

• Special Issue for the 10th Anniversary • Previous Articles     Next Articles

Preparation and characterization of B2O3-coated NaNi1/3Fe1/3Mn1/3O2 cathode materials for sodium-ion batteries

Kaiqiang GUO1(), Haiying CHE2(), Haoran ZHANG1, Jianping LIAO2, Huang ZHOU2, Yunlong ZHANG2, Hangda CHEN2, Zhan SHEN3, Haimei LIU1, Zifeng MA2,3   

  1. 1.College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
    2.Zhejiang NaTRIUM Energy Co. Ltd. , Shaoxing 312000, Zhejiang, China
    3.Department of Chemical Engineering, Shanghai JiaoTong University, Shanghai 200240, China
  • Received:2022-04-20 Revised:2022-05-08 Online:2022-09-05 Published:2022-08-30
  • Contact: Haiying CHE E-mail:gkq0412@163.com;chysyx@sjtu.edu.cn

Abstract:

Due to its high capacity, low cost, and environmental safety, layered oxide O3-NaNi1/3Mn1/3Fe1/3O2 is one of the most promising cathode medium recently. However, its complicated phase transitions during the charge-discharge process lead to inferior electrochemical properties. In this study, we report a synergetic modification method to simultaneously increase the rate capacity and cycling stability of the O3-NaNi1/3Mn1/3Fe1/3O2 cathode medium by utilizing B2O3-coating and B3+ doping. The B2O3-coated NaNi1/3Fe1/3Mn1/3O2 cathode was prepared using the ball milling method. Materials with different B2O3 contents were prepared and characterized using X-ray diffractometer, scanning electron microscope, transmission electron microscopy, and electrochemical examinations. The best performing compound was obtained when 2% B2O3 coating was utilized. B2O3 was uniformly distributed between NaNi1/3Fe1/3Mn1/3O2 particles, and the preparation process did not change the crystal structure of NaNi1/3Fe1/3Mn1/3O2. Furthermore, the charge-discharge curves indicated that the capacity retention of 2% B2O3-coated samples was enhanced from 78% to 87% after 200 cycles. B2O3-coated NaNi1/3Mn1/3Fe1/3O2 also exhibited remarkable rate capability (99 mAh/g at a high rate of 10 C, compared to 75 mAh/g for the pristine). These results indicated that the proposed approach is an effective and reliable surface modification strategy for reinforcing the electrochemical properties of layered oxide materials for sodium-ion batteries.

Key words: H3BO3, B2O3 coating, layered oxide, sodium-ion batteries, NaNi1/3Fe1/3Mn1/3O2 cathode material

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