Electronic structural changes of the electrochemically delithiated LiFe0.5Co0.5PO4 cathode material studied by X-ray absorption spectroscopy

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	Electronic structural changes of the electrochemically delithiated LiFe0.5Co0.5PO4 cathode material studied by X-ray absorption spectroscopy
	Yoon, WS ; Chung, KY ; Nam, KW ; McBreen, J ; Wang, DY ; Huang, XJ ; Li, H ; Chen, LQ ; Yang, XQ
刊名	JOURNAL OF POWER SOURCES
	2008
卷号	183 期号:1 页码:427
关键词	BATTERIES MECHANISM SYSTEM EDGE PHOSPHATES LICOO2
ISSN号	0378-7753
通讯作者	Yang, XQ: Brookhaven Natl Lab, Dept Chem, Bldg 480, Upton, NY 11973 USA.
中文摘要	In order to Study the electronic structure changes of the electrochemically delithiated Li1-xFe0.5Co0.5PO4 system, in situ Fe and Co K-edge XAS and ex situ P K-edge XAS have been carried Out during the first charging process. The Fe and Co K-edge XAS results showed that the major charge compensation at the metal sites during charge is achieved by the oxidation of Fe2+ ions at lower potential plateau (similar to 3.6V) and the oxidation of Co2+ ions at higher potential plateau (similar to 5.0V). The gradual shift of main edge features in P K-edge XANES spectra showed that P-O bonds become less covalent during delithiation, due to the increased covalency of Fe3+-O bonds via the inductive effect. From the observation of pre-edge peaks, it is Concluded that the electrochemical delithiation of Li1-xFePO4 result in the hybridization of P 3p states with the metal 3d states. (C) 2008 Elsevier B.V. All rights reserved.
收录类别	SCI
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/37161]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Yoon, WS,Chung, KY,Nam, KW,et al. Electronic structural changes of the electrochemically delithiated LiFe0.5Co0.5PO4 cathode material studied by X-ray absorption spectroscopy[J]. JOURNAL OF POWER SOURCES,2008,183(1):427.
APA	Yoon, WS.,Chung, KY.,Nam, KW.,McBreen, J.,Wang, DY.,...&Yang, XQ.(2008).Electronic structural changes of the electrochemically delithiated LiFe0.5Co0.5PO4 cathode material studied by X-ray absorption spectroscopy.JOURNAL OF POWER SOURCES,183(1),427.
MLA	Yoon, WS,et al."Electronic structural changes of the electrochemically delithiated LiFe0.5Co0.5PO4 cathode material studied by X-ray absorption spectroscopy".JOURNAL OF POWER SOURCES 183.1(2008):427.