应用化学

• 研究论文 • 上一篇    下一篇

富锂正极材料Li[Li0.2Mn0.4Fe0.4]O2的表面包覆改性

王洪1* 张伟德2   

  1. (1.绵阳师范学院化学与化工学院 绵阳 621000;2.华南理工大学化学学院 广州  510006)
  • 收稿日期:2012-08-23 修回日期:2012-09-13 出版日期:2013-06-10 发布日期:2013-06-10
  • 通讯作者: 王洪,教授; Tel/Fax:0816-2200064; E-mail:wang1959hong@yahoo.com.cn; 研究方向:聚合物锂离子电池,锂离子电池正负极材料
  • 基金资助:
    四川省教育厅(11ZA165)绵阳师范学院(2011D01)资助项目

Surface-coating Modification of Li-rich Cathode Materials Li[Li0.2Mn0.4Fe0.4]O2

WANG Hong1*, ZHANG Weide2   

  1. (1.School of Chemistry and Chemical Engineering,Mianyang Normal University,Mianyang  621000,China;
    2.College of Chemistry,South China University of Technology,Guangzhou 510006,China)
  • Received:2012-08-23 Revised:2012-09-13 Published:2013-06-10 Online:2013-06-10
  • Contact: Wang Hong

摘要: 用共沉淀法合成了富锂正极材料Li[Li0.2Mn0.4Fe0.4]O2,并对其表面进行Al2O3包覆。 采用XRD、SEM和电化学测试等方法对样品进行表征。 结果表明,与Li[Li0.2Mn0.4Fe0.4]O2相比,包覆改性后的Li[Li0.2Mn0.4Fe0.4]O2具有较好的电化学性能,其初始放电容量未明显降低,而循环寿命大大提高,4.0%Al2O3包覆处理的富锂正极材料经50次充放电循环后,容量衰减量在9%左右。

关键词: 锂离子电池, 表面包覆Li[Li0.2Mn0.4Fe0.4]O2, 富锂正极材料

Abstract: Li-rich cathode material of Li[Li0.2Mn0.4Fe0.4]O2 was prepared by co-precipitation, and was modified by surface coating with Al2O3. The modified samples were characterized by X-ray diffraction, scanning electron microscopy, and electrochemical tests. It was found that the 4.0%Al2O3 coated Li[Li0.2Mn0.4Fe0.4]O2 exhibited a good cycling performance compared with the bare Li[Li0.2Mn0.4Fe0.4]O2. The discharge capacity loss of the surface coated Li[Li0.2Mn0.4Fe0.4]O2 after 50 cycling was about 9%.

Key words: Lithium ion batteries, surface coated Li[Li0.2Mn0.4Fe0.4]O2, Li-rich Cathode materials

中图分类号: