Yoon, Won-Sub Chung, Kyung Yoon Nam, Kyung-Wan McBreen, James Wang, Deyu Huang, Xuejie Li, Hong Chen, Liquan Yang, Xiao-Qing 2024-01-20T23:00:21Z 2024-01-20T23:00:21Z 2021-09-03 2008-08-15 0378-7753 https://pubs.kist.re.kr/handle/201004/133226 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. English ELSEVIER PHOSPHO-OLIVINES EDGE MECHANISM BATTERIES SYSTEM LICOO2 Electronic structural changes of the electrochemically delithiated LiFe0.5Co0.5PO4 cathode material studied by X-ray absorption spectroscopy Article 10.1016/j.jpowsour.2008.05.030 1 JOURNAL OF POWER SOURCES, v.183, no.1, pp.427 - 430 JOURNAL OF POWER SOURCES 183 1 427 430 scie scopus 000259659300063 2-s2.0-46749122573 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article; Proceedings Paper PHOSPHO-OLIVINES EDGE MECHANISM BATTERIES SYSTEM LICOO2 X-ray absorption spectroscopy LiFe0.5Co0.5PO4 lithium rechargeable batteries XAS