Title of article
Charge compensation and oxidation in NaxCoO2−δ and LixCoO2−δ studied by XANES
Author/Authors
M. Valkeap??، نويسنده , , Y. Katsumata، نويسنده , , I. Asako، نويسنده , , T. Motohashi، نويسنده , , Felix T.S. Chan، نويسنده , , R.S. Liu، نويسنده , , J.M. Chen and Y.-C. Fang، نويسنده , , H. Yamauchi، نويسنده , , M. Karppinen، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2007
Pages
8
From page
1608
To page
1615
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.
Keywords
Sodium cobaltates , Lithium cobaltates , LixCoO2 , Cobalt oxidation , Charge compensation , Cobalt valence , XAS , XANES , Deintercalation , Chemical extraction , NaxCoO2
Journal title
JOURNAL OF SOLID STATE CHEMISTRY
Serial Year
2007
Journal title
JOURNAL OF SOLID STATE CHEMISTRY
Record number
1332703
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