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Changes in Electronic Structure of the Electrochemically Li-Ion Deintercalated LiNiO2 System Investigated by Soft X-Ray Absorption Spectroscopy



W S. Yoon, Kyung Y. Chung, James McBreen, Daniel A. Fischer, Xiao-Qing Yang


The electronic structures of Li1-xNiO2 system after electrochemically delithiated to various x values have been investigated using soft X-ray absorption spectroscopy (XAS) for oxygen K-edge and Ni LII,III-edge. By comparing the O K-edge XAS spectra of Li1-xNiO2 electrode collected simultaneously by the partial electron yield (PEY) mode and florescence mode (FY), it was found that the surface electronic structure of Li1-xNiO2 electrode is different from the bulk. Therefore, if the PEY mode, which is a surface-sensitive technique, is used alone, the reliability of the results is limited to the surface structures only. Ni LII,III-edge XAS results of Li1-xNiO2 electrode at different charge states, in both the FY and PEY modes, show that Ni2+ ions at the surface are mostly oxidized to Ni3+ ions during Li deintercalation, whereas the process in the bulk is the oxidation of Ni ions from Ni3+ to Ni4+.
Journal of Power Sources


Lithium rechargeable batteries, NEXAFS, XAS


Yoon, W. , Chung, K. , McBreen, J. , Fischer, D. and Yang, X. (2006), Changes in Electronic Structure of the Electrochemically Li-Ion Deintercalated LiNiO<sub>2</sub> System Investigated by Soft X-Ray Absorption Spectroscopy, Journal of Power Sources (Accessed April 18, 2024)
Created December 6, 2006, Updated October 12, 2021