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Raman spectroscopic determination of phase evolutions in LiAlxCo1−xO2 battery materials

Published online by Cambridge University Press:  31 January 2011

P. S. Dobal ,
R. S. Katiyar ,
M. S. Tomar  and
A. Hidalgo
P. S. Dobal
Affiliation:
Department of Physics, University of Puerto Rico, San Juan, Puerto Rico 00931-3343
R. S. Katiyar*
Affiliation:
Department of Physics, University of Puerto Rico, San Juan, Puerto Rico 00931-3343
M. S. Tomar
Affiliation:
Department of Physics, University of Puerto Rico, Mayaguez Campus, Mayaguez, Puerto Rico 00681
A. Hidalgo
Affiliation:
Department of Physics, University of Puerto Rico, Mayaguez Campus, Mayaguez, Puerto Rico 00681
*
a)Address all correspondence to this author. e-mail: rkatiyar@rrpac.upr.clu.edu
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Abstract

Superior battery materials LiAlxCo1−xO2 (x = 0.0, 0.1, 0.3, 0.5, and 0.7) were synthesized using a solution-based route at various sintering temperatures (450–800 °C). In this communication, we report on the use of Raman spectroscopy to study effect of composition and sintering temperature on the resulting material. The phase evolutions in LiAlxCo1−xO2 compositions were studied using micro-Raman spectroscopy and a phase diagram is proposed based on the observations. For less Al content, the low-temperature phases of LiAlxCo1−xO2 showed Raman spectra corresponding to a monoclinic (space group C2/m) structure, while a low-temperature spinel (space group Fd3m) phase was observed for 50% or more Al in these compounds. All these compositions exhibited a layered hexagonal (space group R3m) structure when sintered above 700 °C. Raman spectra also revealed residual Co3O4 in the low-temperature forms of LiCoO2 and LiA10.01Co0.9O2.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 1 , January 2001 , pp. 1 - 4
Copyright
Copyright © Materials Research Society 2001

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