物理化学学报 >> 2008, Vol. 24 >> Issue (07): 1175-1179.doi: 10.3866/PKU.WHXB20080710

研究论文 上一篇    下一篇

Y2O3包覆LiCo1/3Ni1/3Mn1/3O2的电化学性能

王萌; 吴锋; 苏岳锋; 陈实   

  1. 北京理工大学化工与环境学院, 国家高技术绿色材料发展中心, 北京 100081
  • 收稿日期:2008-01-28 修回日期:2008-04-08 发布日期:2008-07-04
  • 通讯作者: 吴锋 E-mail:wufeng863@bit.edu.cn

Electrochemical Characteristics of Y2O3-Coated LiCo1/3Ni1/3Mn1/3O2

WANG Meng; WU Feng; SU Yue-Feng; CHEN Shi   

  1. National Development Center of High Technology Green Materials, School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, P. R. China
  • Received:2008-01-28 Revised:2008-04-08 Published:2008-07-04
  • Contact: WU Feng E-mail:wufeng863@bit.edu.cn

摘要: 通过在硝酸钇水溶液浸渍并焙烧的简单工艺, 在LiCo1/3Ni1/3Mn1/3O2材料表面包覆了一层Y2O3. 采用X射线衍射(XRD), 扫描电子显微镜(SEM), 透射电子显微镜(TEM), 循环伏安(CV)和恒流充放电对包覆和未包覆的LiCo1/3Ni1/3Mn1/3O2进行了测试分析. 结果表明, Y2O3包覆并没有改变LiCo1/3Ni1/3Mn1/3O2的晶体结构, 只存在于LiCo1/3Ni1/3Mn1/3O2的表面; 与未包覆的材料相比, Y2O3包覆后的材料在高电位下具有更好的容量保持率和放电容量. CV测试表明, 包覆层的存在有效抑制了材料层状结构的转变及电极与电解液的负反应.

关键词: LiCo1/3Ni1/3Mn1/3O2, Y2O3, 包覆, 锂离子电池

Abstract: LiCo1/3Ni1/3Mn1/3O2 was coated by a layer of Y2O3 via a simple method. The bared sample was immersed into Y(NO3)3·6H2O solution and then calcined at a certain temperature to get the coated material. The coated and bared LiCo1/3Ni1/3Mn1/3O2 meterials were characterized by X-ray diffraction (XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), cyclic voltammetry (CV), and galvanotactic charge-discharge test. It was showed that Y2O3 existed only on the surface, and had no effect on the crystal structure; the LiCo1/3Ni1/3Mn1/3O2 coated with Y2O3 exhibited better capacity retention than the bared LiCo1/3Ni1/3Mn1/3O2 in the higher cutoff voltage and had higher thermal stability. CV results suggested that the Y2O3 coating suppressed the phase transitions and prevented the surface of cathode materials fromdirect contact with the electrolyte.

Key words: LiCo1/3Ni1/3Mn1/3O2, Y2O3, Coating, Lithium-ion battery

MSC2000: 

  • O646