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Acta Chimica Sinica >

2012 , Vol. 70 >Issue 9: 1055 - 1058

DOI: https://doi.org/10.6023/A1112222

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

  • Liu Haohan ,
  • Zhang Jian ,
  • Lou Yuwan ,
  • Xia Baojia
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  • Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050

Received date: 2011-12-22

  Revised date: 2012-03-15

  Online published: 2012-03-20

Supported by

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

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Abstract

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

Cite this article

Liu Haohan , Zhang Jian , Lou Yuwan , Xia Baojia . An XANES Study of the Stability of Al2O3 Coated LiNi0.4Co0.2Mn0.4O2[J]. Acta Chimica Sinica, 2012 , 70(9) : 1055 -1058 . DOI: 10.6023/A1112222

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