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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (2): 147-151. 上一篇    下一篇

研究论文

层状Li(Ni1/3Co1/3Mn1/3)O2正极材料的合成与电化学性能研究

钟辉*,1, 许惠2   

  1. (1成都理工大学材料与化学工程学院 成都 610059)
    (2重庆工商大学环境与生物工程学院 重庆 400067)
  • 投稿日期:2006-04-14 修回日期:2006-06-13 发布日期:2007-01-28
  • 通讯作者: 钟辉

Synthesis and Electrochemical Characterization of Layered Li(Ni1/3Co1/3Mn1/3)O2 Cathode Material

ZHONG Hui*,1; XU Hui2   

  1. (1 College of Material and Chemical Engineering, Chengdu University of Technology, Chengdu 610059)
    (2 Chongqing Technology and Business University, Chongqing 400067)
  • Received:2006-04-14 Revised:2006-06-13 Published:2007-01-28
  • Contact: ZHONG Hui

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采用共沉淀-喷雾造粒法制备前驱体, 于750 ℃在空气中煅烧20 h合成出层状Li(Ni1/3Co1/3Mn1/3)O2正极材料, 并用XRD, SEM, 粒度分析和电性能测试考察了所得材料结构、形貌及电化学性能. 本层状Li(Ni1/3Co1/3Mn1/3)O2正极材料具有α-NaFeO2结构, 六方晶系, R3m空间群, 其晶胞参数为a＝0.2865 nm, c＝1.4238 nm. 当材料分别在2.8～4.2, 2.8～4.5 V间进行充放电时, 其首次放电容量分别为173.5和185.4 mAh•g－1, 首次充放电效率分别为90%和83.8%, 40次循环后容量保持率分别为96%和84%.

关键词: 锂离子电池, 正极材料, Li(Ni1/3Co1/3Mn1/3)O2

The precipitate-spray method was used to prepare the precursor. The layered Li(Ni1/3Co1/3Mn1/3)- O2 cathode material for lithium ion batteries was synthesized in air atmosphere at 750 ℃ for 20 h from the precursor. XRD analysis, SEM and electrochemical tests were used to characterize the structure, appearance and electrochemical perform-ances of the aimed material. The hexagonal layered LiNi0.5Mn0.5O2 has an α-NaFeO2 structure and space group R3m with lattice parameters of a＝0.2865 nm, c＝1.4238 nm. Initial discharge capacities of 173.5 and 185.4 mAh•g－1 were obtained in the range 2.8～4.2, 2.8～4.5 V, respectively. 96% and 84% of the initial discharge capacities were reserved af-ter 40 cycles at each charge-discharge voltage.

Key words: lithium-ion battery, cathode material, layered Li(Ni1/3Co1/3Mn1/3)O2