| Numéro |
J. Phys. IV France
Volume 7, Numéro C2, Avril 1997
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
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|---|---|---|
| Page(s) | C2-1243 - C2-1244 | |
| DOI | https://doi.org/10.1051/jp4:19972214 | |
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
J. Phys. IV France 7 (1997) C2-1243-C2-1244
DOI: 10.1051/jp4:19972214
Department of Applied Chemistry, Faculty of Science, Science University of Tokyo, Kagurazaka, Shinjuku, Tokyo 162, Japan
© EDP Sciences 1997
J. Phys. IV France 7 (1997) C2-1243-C2-1244
DOI: 10.1051/jp4:19972214
XAFS Characterization of Li Deintercalation in Rechargeable Lithium Battery Materials, LiCoO2-LiNiO2
I. Nakai, K. Takahash, Y. Shiraishi and T. NakagomeDepartment of Applied Chemistry, Faculty of Science, Science University of Tokyo, Kagurazaka, Shinjuku, Tokyo 162, Japan
Abstract
In situ measurements of the Ni and Co K-edge XAFS spectra of Li1-xNiO2 and Li1-xCoO2 as a function of x were successfully carried out for the first time using an electrochemical cell. It is observed that a local Jahn-Teller distortion of the NiO6 octahedron in LiNiO2 was reduced with deintercalation of Li which caused oxidation of the Jahn-Teller d7Ni3+ ion to d6Ni4+ ion. A substitution of Co for Ni in LiNiO2 also reduced the local distortion of the NiO6 octahedron. XANES spectra of LiNiO2 shifted to higher energy side with increasing x while an abrupt shape change was observed in the XANES spectra of Li1-xCoO2 corresponding to phase transition.
© EDP Sciences 1997