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

doi:10.6023/A1112222

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

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XANES 研究Al₂O₃ 包覆LiNi_0.4Co_0.2Mn_0.4O₂ 材料的稳定性

刘浩涵, 张建, 娄豫皖, 夏保佳

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 E-mail:xiabj@mail.sim.ac.cn
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 LiNi_0.4Co_0.2Mn_0.4O₂

Liu Haohan, Zhang Jian, Lou Yuwan, Xia Baojia

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 LiNi_0.4Co_0.2Mn_0.4O₂ (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 (LiNi_0.4Co_0.2Mn_0.4O₂). 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, LiNi_0.4Co_0.2Mn_0.4O₂, Al₂O₃ coating, XANES

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Liu Haohan, Zhang Jian, Lou Yuwan, Xia Baojia. An XANES Study of the Stability of Al₂O₃ Coated LiNi_0.4Co_0.2Mn_0.4O₂[J]. Acta Chimica Sinica, 2012, 70(9): 1055-1058.

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XANES 研究Al₂O₃ 包覆LiNi_0.4Co_0.2Mn_0.4O₂ 材料的稳定性

An XANES Study of the Stability of Al₂O₃ Coated LiNi_0.4Co_0.2Mn_0.4O₂

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