CJCU

Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (12): 2358.

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Synthesis and Electrochemical Behavior of Li-rich Cathode Materials Li[NixLi1/3-2x/3Mn2/3-x/3]O2(x=1/5, 1/4, 1/3) in the Lithium-ion Battery

WANG Sui-Jun, ZHAO Yu-Juan, ZHAO Chun-Song, XIA Ding-Guo*   

  1. College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
  • Received:2009-01-18 Online:2009-12-10 Published:2009-12-10
  • Contact: XIA Ding-Guo. E-mail: dgxia@bjut.edu.cn
  • Supported by:

    北京市自然科学基金(批准号: 2093031)资助.

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Abstract:

The Li-rich cathode materials Li[NixLi1/3-2x/3Mn2/3-x/3]O2(x=1/5, 1/4, 1/3) were synthesized with co-precipitated metal hydroxide precursors M(OH)2(M=Mn, Ni). The results of X-ray diffraction(XRD) and selected area electron diffraction(SAED) analysis confirmed the Li, Ni and Mn atoms are ordered in the M layer to form the superstrucutre. Images of scanning electron microscopy(SEM) show the Li-rich materials particles are about 1—3 μm, aggregated of submicron grains. Electrochemical behavior was examined by charge-discharge cycling. The Li[NixLi1/3-2x/3Mn2/3-x/3]O2(x=1/5, 1/4, 1/3) materials exhibited high reversible capacity of 200—240 mA·h/g and excellent cycle performance between 2.0 and 4.8 V at 10 mA/g current density.

Key words: Lithium ion battery; Li-rich cathode material; Layered structure; Electrochemical behavior

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