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Synthesis and electrochemical properties of Mg-doped LiNi0.6Co0.2Mn0.2O2 cathode materials for Li-ion battery

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Abstract

The layered LiNi0.6Co0.2−x Mn0.2Mg x O2 (x=0.00, 0.03, 0.05, 0.07) cathode materials were prepared by a co-precipitation method. The properties of the Mg-doped LiNi0.6Co0.2Mn0.2O2 were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical measurements. XRD studies showed that the Mg-doped LiNi0.6Co0.2Mn0.2O2 had the same layered structure as the undoped LiNi0.6Co0.2Mn0.2O2. The SEM images exhibited that the particle size of Mg-doped LiNi0.6Co0.2Mn0.2O2 was finer than that of the undoped LiNi0.6Co0.2 Mn0.2O2 and that the smallest particle size is only about 1 μm. The Mg-doped LiNi0.6Co0.2Mn0.2O2 samples were investigated on the Li extraction/insertion performances through charge/discharge, cyclic voltammogram (CV), and electrochemical impedance spectra(EIS). The optimal doping content of Mg was that x= 0.03 in the LiNi0.6Co0.2−x Mn0.2Mg x O2 samples to achieve high discharge capacity and good cyclic stability. The electrode reaction reversibility and electronic conductivity was enhanced, and the charge transfer resistance was decreased through Mg-doping. The improved electrochemical performances of the Mg-doped LiNi0.6Co0.2Mn0.2O2 cathode materials are attributed to the addition of Mg2+ ion by stabilizing the layer structure.

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Authors and Affiliations

  1. Shaoyang Medical College Level Speciaity School Department of Pharmacy, Shaoyang, 422000, China

    Chunyan Fu  (傅春燕) & Gengxi Li

  2. Chemistry Science and Technology School, Zhanjing Normal University, Zhanjiang, 524048, China

    Zhongliu Zhou

  3. Red Cross Hospital at Xinshao County of Hunan Province, Shaoyang, 422000, China

    Yonghui Liu

  4. Department of Biological and Chemical Engineering, Guangxi University of Technology, Liuzhou, 545006, China

    Qian Zhang & Yansheng Zheng

Authors
  1. Chunyan Fu  (傅春燕)
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  2. Zhongliu Zhou
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  3. Yonghui Liu
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  4. Qian Zhang
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  5. Yansheng Zheng
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  6. Gengxi Li
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Correspondence to Chunyan Fu  (傅春燕).

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Funded by the Scientific Research Fund of Hunan Education Department (10C0294)

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Fu, C., Zhou, Z., Liu, Y. et al. Synthesis and electrochemical properties of Mg-doped LiNi0.6Co0.2Mn0.2O2 cathode materials for Li-ion battery. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 26, 211–215 (2011). https://doi.org/10.1007/s11595-011-0199-z

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  • DOI: https://doi.org/10.1007/s11595-011-0199-z

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