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Title: Charge compensation and oxidation in Na {sub x} CoO{sub 2-} {sub {delta}} and Li {sub x} CoO{sub 2-} {sub {delta}} studied by XANES

Abstract

A comparative study on the oxidation and charge compensation in the A{sub x} CoO{sub 2-} {sub {delta}} 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 A{sub x} CoO{sub 2-} {sub {delta}} the valence of cobalt increases more in Li {sub x} CoO{sub 2-} {sub {delta}} than in Na {sub x} CoO{sub 2-} {sub {delta}} . In addition, the data of O 1s XANES indicate that charge compensation by oxygen is more pronounced in Na {sub x} CoO{sub 2-} {sub {delta}} than in Li {sub x} CoO{sub 2-} {sub {delta}} . - Graphical abstract: The valence of cobalt increases more upon removal of alkali metal from Li {sub x} CoO{sub 2} than from Na {sub x} CoO{sub 2}.

Authors:
 [1];  [2];  [2];  [2];  [3];  [3];  [4];  [2];  [3];  [5]
  1. Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503 (Japan), E-mail: markus.valkeapaa@tkk.fi
  2. Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503 (Japan)
  3. Department of Chemistry and Center for Nano Storage Research, National Taiwan University, Taipei 10617, Taiwan (China)
  4. National Synchrotron Radiation Research Center (NSRRC), Hsinchu 30076, Taiwan (China)
  5. (Finland)
Publication Date:
OSTI Identifier:
21015816
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 180; Journal Issue: 5; Other Information: DOI: 10.1016/j.jssc.2007.03.001; PII: S0022-4596(07)00093-X; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION SPECTROSCOPY; COBALT; COBALT OXIDES; LITHIUM OXIDES; OXIDATION; SODIUM OXIDES; VALENCE; X-RAY SPECTROSCOPY

Citation Formats

Valkeapaeae, M., Katsumata, Y., Asako, I., Motohashi, T., Chan, T.S., Liu, R.S., Chen, J.M., Yamauchi, H., Karppinen, M., and Laboratory of Inorganic and Analytical Chemistry, Helsinki University of Technology, FIN-02015 Espoo. Charge compensation and oxidation in Na {sub x} CoO{sub 2-} {sub {delta}} and Li {sub x} CoO{sub 2-} {sub {delta}} studied by XANES. United States: N. p., 2007. Web. doi:10.1016/j.jssc.2007.03.001.
Valkeapaeae, M., Katsumata, Y., Asako, I., Motohashi, T., Chan, T.S., Liu, R.S., Chen, J.M., Yamauchi, H., Karppinen, M., & Laboratory of Inorganic and Analytical Chemistry, Helsinki University of Technology, FIN-02015 Espoo. Charge compensation and oxidation in Na {sub x} CoO{sub 2-} {sub {delta}} and Li {sub x} CoO{sub 2-} {sub {delta}} studied by XANES. United States. doi:10.1016/j.jssc.2007.03.001.
Valkeapaeae, M., Katsumata, Y., Asako, I., Motohashi, T., Chan, T.S., Liu, R.S., Chen, J.M., Yamauchi, H., Karppinen, M., and Laboratory of Inorganic and Analytical Chemistry, Helsinki University of Technology, FIN-02015 Espoo. Tue . "Charge compensation and oxidation in Na {sub x} CoO{sub 2-} {sub {delta}} and Li {sub x} CoO{sub 2-} {sub {delta}} studied by XANES". United States. doi:10.1016/j.jssc.2007.03.001.
@article{osti_21015816,
title = {Charge compensation and oxidation in Na {sub x} CoO{sub 2-} {sub {delta}} and Li {sub x} CoO{sub 2-} {sub {delta}} studied by XANES},
author = {Valkeapaeae, M. and Katsumata, Y. and Asako, I. and Motohashi, T. and Chan, T.S. and Liu, R.S. and Chen, J.M. and Yamauchi, H. and Karppinen, M. and Laboratory of Inorganic and Analytical Chemistry, Helsinki University of Technology, FIN-02015 Espoo},
abstractNote = {A comparative study on the oxidation and charge compensation in the A{sub x} CoO{sub 2-} {sub {delta}} 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 A{sub x} CoO{sub 2-} {sub {delta}} the valence of cobalt increases more in Li {sub x} CoO{sub 2-} {sub {delta}} than in Na {sub x} CoO{sub 2-} {sub {delta}} . In addition, the data of O 1s XANES indicate that charge compensation by oxygen is more pronounced in Na {sub x} CoO{sub 2-} {sub {delta}} than in Li {sub x} CoO{sub 2-} {sub {delta}} . - Graphical abstract: The valence of cobalt increases more upon removal of alkali metal from Li {sub x} CoO{sub 2} than from Na {sub x} CoO{sub 2}.},
doi = {10.1016/j.jssc.2007.03.001},
journal = {Journal of Solid State Chemistry},
number = 5,
volume = 180,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}