Monolithic electrochromic devices using lithium ion conducting perovskite-type oxides |
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Authors: | V Thangadurai W Weppner |
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Institution: | (1) Chair for Sensors and Solid State Ionics, Faculty of Engineering, Christian — Albrechts University, Kaiserstrasse 2, D-24143 Kiel, Germany |
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Abstract: | The electrical conductivities of several perovskite-type lithium ion conductors in the Li-Sr-Nb-Ta-Ti-O system have been investigated.
The Li+-ion conductivities of the Ta-compounds were found to be higher than those of the corresponding Nb-compounds, i.e., Li0.3Sr0.6Ta0.5Ti0.5O3 exhibits a bulk ionic conductivity of 1.7×10−4 S/cm at 30 °C, while Li0.3Sr0.6Nb0.5Ti0.5O3 shows a value of 5.4×10−6 S/cm at the same temperature. Substitution of Fe in Li0.3Sr0.6Ta0.5Ti0.5O3 decreases the Li+-ion conductivity slightly. The operation of a monolithic (single element) electrochromic devices was demonstrated using perovskite-type
Li0.3Sr0.6B0.5Ti0.5O3 (B=Nb, Ta). The tantalum compound exhibited the largest coloration at the positive electrode side by the application of a
voltage of 1.5 V and was bleached under short-circuit conditions at 350 °C.
Paper presented at the 9th EuroConference on Ionics, Ixia, Rhodes, Greece, Sept. 15–21, 2002. |
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