CRCU

Chemical Research in Chinese Universities ›› 2010, Vol. 26 ›› Issue (3): 449-452.

• Articles • Previous Articles     Next Articles

Synthesis of Monoclinic Li0.33MnO2 and Its Electrochemical Properties in Different Potential Windows

CHEN Hong1,2, WEI Ying-jin3, JIANG Tao1, CHEN Gang3 and WANG Chun-zhong3*   

  1. 1. College of Materials Science and Engineering, Jilin University, Changchun 130021, P. R. China;
    2. College of Physics, Beihua University, Jilin 132013, P. R. China;
    3. College of Physics and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, P. R. China
  • Received:2009-08-21 Revised:2009-11-05 Online:2010-05-25 Published:2010-07-27
  • Contact: WANG Chun-zhong. E-mail: wcz@jlu.edu.cn
  • Supported by:

    Supported by the Special Funds for Major State Basic Research Project of China(No.2009CB220104), the Program for Changjiang Scholar and Innovative Research Team in Universities of China(No.IRT0625), Jilin Project of Research and Deve- lopment, China (No.20075007) and the Doctor Subject Foundation of China(No.20070183003).

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Abstract:

Li0.33MnO2 cathode material was synthesized by solid state reaction. The material showed a small coherent domain size about 10 nm determined by X-ray diffraction and transmission electron microscopy. The electrochemical properties of the material were studied in different potential windows of 3.5―2.0 V and 4.3―2.0 V. An irreversible transformation to spinel phase was observed in the initial several cycles, which was more prominent on cycling at 4.3―2.0 V. Electrochemical impedance spectroscopy showed that the Li+ diffusion coefficient of the material was about 2×10-9 cm2/s. Li0.33MnO2 showed a reversible discharge capacity of 140 and 200 mA·h/g in the potential windows of 3.5―2.0 V and 4.3―2.0 V, respectively. But the capacity retention at 4.3―2.0 V was poor due to the thicker spinel layer formed on the material surface.

Key words: Lithium ion battery; Lithium manganese oxide; Phase transformation; Electrochemical property