Thick CeO2-TiO2 sol-gel coatings for Li-ion storage electrode in electrochromic devices

Kyo-Sook Choi; Sabine Heusing; Michel Andre Aegerter

doi:10.1117/12.453909

23 October 2002 Thick CeO₂-TiO₂ sol-gel coatings for Li-ion storage electrode in electrochromic devices

Kyo-Sook Choi, Sabine Heusing, Michel Andre Aegerter

Proceedings Volume 4804, Sol-Gel Optics VI; (2002) https://doi.org/10.1117/12.453909
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

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.

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Kyo-Sook Choi, Sabine Heusing, and Michel Andre Aegerter "Thick CeO₂-TiO₂ sol-gel coatings for Li-ion storage electrode in electrochromic devices", Proc. SPIE 4804, Sol-Gel Optics VI, (23 October 2002); https://doi.org/10.1117/12.453909

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KEYWORDS

Crystals

Electrodes

Glasses

Transparent conductors

Heat treatments

Sol-gels

Oxides

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