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化学学报
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化学学报 ›› 2010, Vol. 68 ›› Issue (14): 1391-1398. 上一篇    下一篇

研究论文

锂离子电池正极材料Li[Li0.2Mn0.54Ni0.13Co0.13]O2的合成及电化学性能研究

杜柯，周伟瑛，胡国荣*，彭忠东，蒋庆来   

  1. (中南大学冶金科学与工程学院 长沙 410083)
  • 投稿日期:2009-09-25 修回日期:2009-12-23 发布日期:2010-03-25
  • 通讯作者: 周伟瑛 E-mail:yingzi494184810518@126.com

Synthesis and Electrochemical Properties of Li[Li0.2Mn0.54Ni0.13- Co0.13]O2 as Cathode Material for Li-ion Batteries

DU Ke, ZHOU Wei-Ying, HU Guo-Rong, PENG Zhong-Dong, JIANG Qing-Lai   

  1. (Department of Metallurgical Science and Engineering, Central South University of Technology, Changsha 410083)
  • Received:2009-09-25 Revised:2009-12-23 Published:2010-03-25

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以LiOH•H2O, Ni2O3, Co3O4和MnO2为原料, 经过机械活化后在空气气氛下经高温烧结, 合成了锂离子电池正极材料Li[Li0.2Mn0.54Ni0.13Co0.13]O2. 通过X射线衍射(XRD)、扫描电子显微镜(SEM)和电化学性能测试对所得样品的结构、形貌及电化学性能进行了表征. 结果表明, 900 ℃下烧结10 h后可获得晶粒细小均匀的层状Li[Li0.2Mn0.54Ni0.13Co0.13]O2材料, 并具有良好的电化学性能, 在室温下以60 mA/g的电流充放电, 首次放电比容量可达到248.2 mAh/g, 循环50次后放电比容量为239.4 mAh/g, 容量保持率为96.45％. 测试了该材料的高低温循环性能.

关键词: Li[Li0.2Mn0.54Ni0.13Co0.13]O2, 锂离子电池, 正极材料, 机械活化

Li[Li0.2Mn0.54Ni0.13Co0.13]O2 was synthesized from LiOH•H2O, Ni2O3, Co3O4 and MnO2 by improved solid state method. The raw materials were mixed with mechanical activation process, and then calcined at high temperature in air. The products were analyzed by X-ray diffractometry (XRD), scaning electron microscopy (SEM) and electrochemical tests. The results showed that the sandwich Li[Li0.2Mn0.54Ni0.13- Co0.13]O2 material obtained at 900 ℃ for 10 h exhibited uniform and fine particle sizes. The initial discharge capacity of prepared Li[Li0.2Mn0.54Ni0.13Co0.13]O2 is 248.2 mAh/g at room temperature, and manitains 239.4 mAh/g after 50 cycles at a constant discharge current of 60 mA/g, indicating high electrochemical capacity and good cycling stability. Its cycle ability was also investigated at 55 and 0 ℃.

Key words: Li[Li0.2Mn0.54Ni0.13Co0.13]O2, lithium-ion battery, cathode material, mechanical activation