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电化学(中英文) ›› 2018, Vol. 24 ›› Issue (1): 56-62.  doi: 10.13208/j.electrochem.170317

• 电镀与表面精饰近期研究专辑( 哈尔滨工业大学 安茂忠教授主编) • 上一篇    下一篇

高首效富镍正极材料LiNi0.6Co0.2Mn0.2O2的合成及电化学性能研究

关小云,洪朝钰,朱建平,王伟立,李益孝,杨勇*   

  1. 厦门大学固体表面物理化学国家重点实验室,化学化工学院化学系,福建 厦门 361005
  • 收稿日期:2017-03-17 修回日期:2017-04-20 出版日期:2018-02-28 发布日期:2017-04-24
  • 通讯作者: 杨勇 E-mail:yyang@xmu.edu.cn
  • 基金资助:

    国家自然科学基金项目(No. 21233004, No. 21428303)资助

Synthesis and Electrochemical Properties of Nickel-Rich Cathode Material LiNi0.6Co0.2Mn0.2O2 with High Initial Coulombic Efficiency

GUAN Xiao-yun, HONG Chao-yu, ZHU Jian-ping, WANG Wei-li, LI Yi-xiao, YANG Yong*   

  1. State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China
  • Received:2017-03-17 Revised:2017-04-20 Published:2018-02-28 Online:2017-04-24
  • Contact: YANG Yong E-mail:yyang@xmu.edu.cn

摘要:

采用共沉淀—高温固相烧结的方法合成了富镍正极材料LiNi0.6Co0.2Mn0.2O2(简称NCM622),通过X射线粉末衍射(XRD)/Rietveld精修法、扫描电子显微镜(SEM)及电化学测试,对不同温度下合成材料的结构、形貌、电化学性能进行表征. 结果表明,800℃下,NCM622阳离子混排程度最低(~1.97%),首圈库伦效率高达92.2%,100圈容量保持率为81.4%.

关键词: 锂离子电池, 正极材料, LiNi0.6Co0.2Mn0.2O2 , 首周库仑效率

Abstract:

Nickel-rich cathode materials LiNi0.6Co0.2Mn0.2O2(NCM622)were synthesized by a co-precipitation-solid state sintering method at different temperatures. The structure, morphology and electrochemical performance of the as-prepared materials were investigated by X-ray powder diffraction (XRD) /Rietveld refinement, scanning electron microscope (SEM) and electrochemical experiments. It is found that NCM622 calcined at 800 ℃ showed the lowest degree of cation disorder (~1.97%) with a high initial Coulombic effiency of 92.2% and the capacity retention of 81.4% after 100 cycles.

Key words:  lithium-ion battery, cathode material; LiNi0.6Co0.2Mn0.2O2, initial Coulombic efficiency

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