Acta Chimica Sinica ›› 2012, Vol. 70 ›› Issue (9): 1055-1058.DOI: 10.6023/A1112222 Previous Articles     Next Articles

Full Papers

XANES 研究Al2O3 包覆LiNi0.4Co0.2Mn0.4O2 材料的稳定性

刘浩涵, 张建, 娄豫皖, 夏保佳   

  1. 中国科学院上海微系统与信息技术研究所 上海 200050
  • 投稿日期:2011-12-22 修回日期:2012-03-15 发布日期:2012-03-20
  • 通讯作者: 夏保佳
  • 基金资助:

    上海市科委纳米专项(No. 1052nm00100)和上海市科委重大项目子课题(No. 11DZ1100205)资助项目.

An XANES Study of the Stability of Al2O3 Coated LiNi0.4Co0.2Mn0.4O2

Liu Haohan, Zhang Jian, Lou Yuwan, Xia Baojia   

  1. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050
  • Received:2011-12-22 Revised:2012-03-15 Published:2012-03-20
  • Supported by:

    Project supported by the Shanghai Committee of Science and Technology, China (No. 1052nm00100) and (No. 11DZ1100205).

0.5 wt% Al2O3-coated LiNi0.4Co0.2Mn0.4O2 (NCM) for lithium-ion batteries was prepared by sol-gel hydrolysis method. The TEM (transmission electron microscopy) showed that Al2O3 was covered uniformly at the surface of the NCM (LiNi0.4Co0.2Mn0.4O2). The linear potential sweep and thermogravimetric tests were performed to investigate the oxygen evolution of the NCM. The electronic structure of O was investigated by the XANES (X-ray absorption near edge structure). The results indicated that the oxygen evolution of the NCM was suppressed by the Al2O3 coating, and partial hybrid state of metal 3d and O2p was translated to a hybrid of metal 4sp and O2p by the Al2O3 coating, leading to the improvement of the safety performance.

Key words: lithium ion battery, LiNi0.4Co0.2Mn0.4O2, Al2O3 coating, XANES