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Structural Phase Transformations in V2O5 Thin Film Cathode Material for Li Rechargeable Batteries

Published online by Cambridge University Press:  10 February 2011

J. M. McGraw ,
J. D. Perkins ,
J.-G. Zhang ,
P. A. Parilla ,
T. F. Ciszek ,
M. L. Fu ,
D. M. Trickett ,
J. A. Turner  and
D. S. Ginley
J. M. McGraw
Affiliation:
Colorado School of Mines, Golden, CO, USA
J. D. Perkins
Affiliation:
National Renewable Energy Laboratory, Golden, CO, USA
J.-G. Zhang
Affiliation:
National Renewable Energy Laboratory, Golden, CO, USA
P. A. Parilla
Affiliation:
National Renewable Energy Laboratory, Golden, CO, USA
T. F. Ciszek
Affiliation:
National Renewable Energy Laboratory, Golden, CO, USA
M. L. Fu
Affiliation:
University of Colorado, Boulder, CO, USA
D. M. Trickett
Affiliation:
Colorado School of Mines, Golden, CO, USA
J. A. Turner
Affiliation:
National Renewable Energy Laboratory, Golden, CO, USA
D. S. Ginley
Affiliation:
National Renewable Energy Laboratory, Golden, CO, USA
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Abstract

We report on investigations of V2O5 thin film cathodes prepared by pulsed laser deposition and the phase transformations which occur during electrochemical cycling. Our experimental results on PLD-grown, textured V2O5 crystalline films concur with reports in the literature that there is a voltage threshold above which, cycling appears to be completely reversible and below which, cycling appears to be irreversible. Crystalline films discharged beyond the threshold to 2.0 V vs. Li exhibited an immediate and continuous fade in capacity as well as a ∼90% decrease in XRD peak intensity and a similar decrease in Raman signal intensity in as few as 10 cycles. We have made co-phase material by both electrochemically discharging virgin, crystalline V2O5 and by further discharging previously cycled films which showed irreversible structural changes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 496: Symposium Y – Materials For Electrochemical Energy Storage & Conversion II… , 1997 , 373
Copyright
Copyright © Materials Research Society 1998

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References

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