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Citation: ZHANG Qian, HE Shi-Ci, LIU Wei-Wei, FANG Guo-Qing, KANEKO Shingo, YANG Yu-Sheng, ZHENG Jun-Wei, LI De-Cheng. Preparation, Structure and Electrochemical Properties of Li1.2Mn0.4+xNixCr0.4-2xO2 by Spray-Dry Process[J]. Chinese Journal of Inorganic Chemistry, ;2012, 28(12): 2501-2507. shu

Preparation, Structure and Electrochemical Properties of Li1.2Mn0.4+xNixCr0.4-2xO2 by Spray-Dry Process

  • 1.

    1. Key Laboratory of Lithium Battery Materials of Jiangsu Province, Institute of Chemical Power Sources, Soochow University, Suzhou, Jiangsu 215006, China;

  • Corresponding author: LI De-Cheng, 
  • Received Date: 19 April 2012
    Available Online: 18 May 2012

    Fund Project: 国家自然科学基金(No．20973200)资助项目. (No．20973200)

  • Li1.2Mn0.4+xNixCr0.4-2xO2 (x=0, 0.05, 0.10, 0.15, 0.20) were synthesized by spray-drying process, which was named as SD1 to SD5, respectively. Their crystal structures, element valences and the electrochemical performances were investigated by XRD, XPS, ICP, SEM and TEM. All compounds have a typical feature of a Li-rich layered solid solution material in terms of their crystal structures, and the valences of Ni and Mn are 2.5+ and 4+, respectively. As to the valence of Cr, both +3 and +6 co-exist in the samples from SD1 to SD4. Moreover, the present of amorphous Li2CrO4 gives rise to the strong hygroscopicity, which should be closed related to the poor electrochemical properties. Sample with water-washed treatment could effectively remove the amorphous Li2CrO4, and consequently improved its electrochemical properties. The washed SD4 has a reversible capacity of 237 mA·h·g-1 and the capacity retention is about 99%, when the cell was operated at 50 ℃ in the range of 4.8~2.0 V. If it was operated in the range of 5.0~2.0 V at 50 ℃, the initial discharge capacity increases to 307 mA·h·g-1.
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