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

被引：0
|
作者：
Liu Haohan [1 ]
Zhang Jian [1 ]
Lou Yuwan [1 ]
Xia Baojia [1 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, Shanghai 200050, Peoples R China
来源：
ACTA CHIMICA SINICA | 2012年 / 70卷 / 09期
关键词：
lithium ion battery; LiNi0.4Co0.2Mn0.4O2; Al2O3; coating; XANES; LITHIUM-ION BATTERY; CELLS; SPECTROSCOPY; MECHANISM; BEHAVIOR; SAFETY;
D O I：
暂无
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
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.
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页码：1055 / 1058
页数：4
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