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Proceedings Paper

Thick CeO2-TiO2 sol-gel coatings for Li-ion storage electrode in electrochromic devices
Author(s): Kyo-Sook Choi; Sabine Heusing; Michel Andre Aegerter
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Paper Abstract

CeO2-TiO2 sol-gel coatings are well known as Li-ion storage electrode in electrochromic (EC) devices of the form glass/ TE /WO3/ electrolyte/ CeO2-TiO2/ TE/ glass (TE: transparent electrode, e.g. SnO2:F, FTO). The charge capacity of the CeO2-TiO2 coating is a limiting factor to get a high coloration intensity of such devices. In order to improve the charge capacity of these electrodes, new routes for the preparation of thick porous CeO2-TiO2 sol-gel layers were tested. One route was the preparation of thick porous TiO2 coatings on a conducting glass support (FTO) using a solution of colloidal TiO2 particles. After heat treatment at temperatures up to 550°C the coatings were soaked in a solution of a cerium-IV (Ce(NH4)2(NO3)6) or a cerium-III salt (Ce(NO3)3 6H2O) and heat treated again. Another route was the preparation of sols by mixing a solution of the cerium-IV or cerium-III salt or a colloidal CeO2-sol with the colloidal solution of TiO2. After dip coating on FTO-glass the coatings were also heat treated at temperatures up to 500°C. ALl these coatings were studied electrochemically in 1 M LiC1O4 in propylene carbonate electrolyte. Although thick porous single coatings could be obtained, typically 450 nm for TiO2 and 600 nm for cerium-titanium oxide, the intercalated and deintercalcated Li+ charges remain small and lie in the range of 2 mC/cm2 to 3 mC/cm2. The reasons for such low charge capacity is discussed.

Paper Details

Date Published: 23 October 2002
PDF: 8 pages
Proc. SPIE 4804, Sol-Gel Optics VI, (23 October 2002); doi: 10.1117/12.453909
Show Author Affiliations
Kyo-Sook Choi, Institut für Neue Materialien GmbH (Germany)
Sabine Heusing, Institut für Neue Materialien GmbH (Germany)
Michel Andre Aegerter, Institut für Neue Materialien GmbH (Germany)

Published in SPIE Proceedings Vol. 4804:
Sol-Gel Optics VI
Edward J. A. Pope; Helmut K. Schmidt; Bruce S. Dunn; Shuichi Shibata, Editor(s)

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