Energy Storage Science and Technology ›› 2020, Vol. 9 ›› Issue (5): 1410-1415.doi: 10.19799/j.cnki.2095-4239.2020.0087

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Preparation and electrochemical performance of VOPO4·2H2O nanosheet cathode for sodium-ion batteries

Xianghua ZHANG1(), Wei LUO1, Xianhong RUI1(), Yan YU2()   

  1. 1.School of Materials and Energy, Guangdong University of Technology, Guangzhou 510080, Guangdong, China
    2.Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, Anhui, China
  • Received:2020-03-01 Revised:2020-03-15 Online:2020-09-05 Published:2020-09-08
  • Contact: Xianhong RUI,Yan YU E-mail:1633202916@qq.com;xhrui@gdut.edu.cn;yanyumse@ustc.edu.cn

Abstract:

VOPO4·2H2O is thought to be a promising cathode material for sodium-ion batteries (SIBs) owing to its typical two-dimensional layered structure, which facilitates rapid sodium transportation. Here, a cathode constructed of VOPO4·2H2O nanosheets (thickness: ~10 nm) was successfully prepared via a simple hydrothermal method. The corresponding morphology and electrochemical properties of the cathode were systematically analyzed. The as-prepared VOPO4·2H2O nanosheets were very uniform, and when used as the SIB cathode, it displayed an excellent electrochemical performance including high reversible specific capacity, excellent rate capability and good cycling stability. For example, the VOPO4·2H2O nanosheet cathode showed a high average operating voltage of 3.5 V and a reversible capacity of 130 mA·h/g at a rate of 0.05 C. Even at a high rate of 5 C, the cathode could still obtain a capacity of 70 mA·h/g and a retention of 77% was maintained after 400 cycles. This outstanding sodium storage performance is primarily due to the advantages of its unique nanosheet structure, which promotes rapid sodium diffusion.

Key words: sodium ion battery, cathode material, VOPO4·2H2O, nanosheet

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