| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1333105 | Journal of Solid State Chemistry | 2007 | 8 Pages |
Abstract
A comparative study on the oxidation and charge compensation in the AxCoO2−δ systems, A=Na (x=0.75, 0.47, 0.36, 0.12) and Li (x=1, 0.49, 0.05), using X-ray absorption spectroscopy at O 1s and Co 2p edges is reported. Both the O 1s and Co 2p XANES results show that upon removal of alkali metal from AxCoO2−δ the valence of cobalt increases more in LixCoO2−δ than in NaxCoO2−δ. In addition, the data of O 1s XANES indicate that charge compensation by oxygen is more pronounced in NaxCoO2−δ than in LixCoO2−δ.
Graphical abstractThe valence of cobalt increases more upon removal of alkali metal from LixCoO2 than from NaxCoO2.Figure optionsDownload full-size imageDownload as PowerPoint slide
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Inorganic Chemistry
Authors
M. Valkeapää, Y. Katsumata, I. Asako, T. Motohashi, T.S. Chan, R.S. Liu, J.M. Chen, H. Yamauchi, M. Karppinen,