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The influence of microstructure on the electrochromic properties of LixWO3 films: Part II. Limiting mechanisms in coloring and bleaching processes

Published online by Cambridge University Press:  03 March 2011

Ji-Guang Zhang ,
David K. Benson ,
Edwin C. Tracy  and
Satyen K. Deb
Ji-Guang Zhang
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401-3393
David K. Benson
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401-3393
Edwin C. Tracy
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401-3393
Satyen K. Deb
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401-3393
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Abstract

Various factors affecting the coloring and bleaching processes of LixWO3 films have been studied. The rate of the coloring process is limited by the decreasing electromotive force in the LixWO3 film and by the components of the series circuit resistance, including the electrolyte resistance and the diffusion impedance within the film. The bleaching process in a thick film is limited by either the space charge or by the diffusion impedance, depending on the experimental conditions. A more complete and quantitative model of the coloring/bleaching process has been developed and shows good agreement with experimental results. Our analysis also indicates that the lithium concentration value of x near the LixWO3/electrolyte interface can greatly exceed its reversible limit during the coloring process, even though the average x value within the film remains much lower than the reversible limit. This phenomenon may introduce some irreversible structural changes in the film, which in turn may constitute one of the film's degradation mechanisms.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 10 , October 1993 , pp. 2657 - 2667
Copyright
Copyright © Materials Research Society 1993

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