高等学校化学学报

高等学校化学学报

• 研究简报 • 上一篇    下一篇

Ti, F复合掺杂改进LiNi1/3Co1/3Mn1/3O2正极材料的电化学性能

丁燕怀1,2, 张平1,2, 姜勇1,2, 尹久仁1,2, 卢其斌3, 高德淑3   

    1. 湘潭大学土木工程与力学学院,
    2. 基础力学与材料工程研究所,
    3. 化学学院, 湘潭 411105
  • 收稿日期:2007-05-22 修回日期:1900-01-01 出版日期:2007-10-10 发布日期:2007-10-10
  • 通讯作者: 张平

Improvement on the Electrochemical Properties of Cathode Material LiNi1/3Co1/3Mn1/3O2 by Ti-F Co-substitution

DING Yan-Huai1,2, ZHANG Ping1,2*, JIANG Yong1,2, YIN Jiu-Ren1,2, LU Qi-Bin3, GAO De-Shu3   

    1. College of Civil Engineering & Mechanics,
    2. Institute of Fundamental Mechanics & Material Engineering,
    3. College of Chemistry, Xiangtan University, Xiangtan 411105, China
  • Received:2007-05-22 Revised:1900-01-01 Online:2007-10-10 Published:2007-10-10
  • Contact: ZHANG Ping

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摘要： 采用复合离子掺杂技术对LiNi1/3Co1/3Mn1/3O2进行改性, 并对材料的结构及电化学性能进行了考察.

关键词: 正极材料, 电化学性能, 复合掺杂, 电荷转移阻抗

Abstract: Layered LiNi1/3Co1/3Mn1/3O2 as the cathode materials for lithium ion batteries was synthesized with the co-precipitated metal carbonate as the precursor. The effects of Ti-F co-substitution on the structure and electrochemical properties of LiNi1/3Co1/3Mn1/3O2 were studied by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), electrochemical impedance spectroscopy(EIS) and galvanostatic charge-discharge experiments. Ti-F co-substitution leads to the change in the content of transition metal ions with a low valence, thereby induces an expansion in lattice volume. Furthermore, the increase of charge-transfer resistances during the cycling was suppressed by Ti-F co-substitution. The initial discharge capacity of substituted sample is 165.23 mA·h/g and the capacity retention rate is 94.9% up to 20 cycles.

Key words: Cathode material, Electrochemical property, Co-substitution, Charge-transfer resistance

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