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Raman characterization of Li(Al1-xCox)O2

Published online by Cambridge University Press:  31 January 2011

G. Chen ,
W. Hao ,
Y. Shi ,
Y. Wu  and
S. Perkowitz
G. Chen
Affiliation:
Department of Materials Science and Institute of Materials Science, Jilin University, Changchun 130023, People's Republic of China, and Physics Department, Emory University, Atlanta, Georgia 30322
W. Hao
Affiliation:
Department of Materials Science and Institute of Materials Science, Jilin University, Changchun 130023, People's Republic of China
Y. Shi
Affiliation:
Department of Materials Science and Institute of Materials Science, Jilin University, Changchun 130023, People's Republic of China
Y. Wu
Affiliation:
Key Laboratory for Supermolecular Structure and Spectroscopy, Jilin University, Changchun 130023, People's Republic of China
S. Perkowitz
Affiliation:
Physics Department, Emory University, Atlanta, Georgia 30322
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Abstract

For the first time, we measured Raman spectra from Li(Al1-xCox)O2 (x = 0.5 to 0.9), a new cathode material for lithium batteries. Whereas LiCoO2 sintered at 400 °C develops a spinel structure, Li(Al1-xCox)O2 sintered at 380 °C is amorphous, as shown by its single broad Raman band. Li(Al1-xCox)O2 sintered at 700 or 900 °C shows Raman peaks independent of x that coincide with those from LiCoO2, indicating that Li(Al1-xCox)O2 has the α–NaFeO2 structure (space group R3m). Traces of the impurity phase Co3O4 appear in samples treated at 900 °C but not at 700 °C. The Raman peak widths exceed those in LiCoO2, suggesting that replacement of Co by Al increases disorder among the Li ions.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 3 , March 2000 , pp. 583 - 585
Copyright
Copyright © Materials Research Society 2000

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References

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