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Thin Film Counterelectrodes with High Li Charge Capacity for Electrochromic Windows
Authors:Franco Varsano  Francesca Decker  Enrico Masetti
Affiliation:(1)  Chemistry Department, University of Roma “La Sapienza”, I-00185 Roma, Italy, IT;(2)  Thin Film Optics Laboratory, ENEA-La Casaccia, I-00060 Roma, Italy, IT
Abstract:Summary.  Ce-V mixed oxide films have been deposited by RF sputtering with the aim of increasing the Li charge capacity of counter electrodes in smart windows. Such mixed oxides have shown high transmittance and optical passivity in the visible region. After electrode pre-conditioning by cyclic voltammetry, a good electrochemical reversibility in LiClO4– propylene carbonate electrolyte was observed, and large Li-charge capacity under galvanostatic charging (up to 50 mCċcm−2) has been measured. The electrode charge capacity decreased after prolonged insertion-deinsertion cycles, whereas the photoptic transmittance remained about constant. After 800 cycles the Li-charge capacity decreased to 40 mCċcm−2. The Li diffusion coefficient inside the films measured by electrochemical impedance and by galvanostatic titration ranged from 10−11 cm2ċs−1 to 10−13cm2ċs−1. We observed that the Li charge capacity of the film electrodes is a function of the film deposition conditions, because it increased with the vanadium oxide concentration in the target and with the oxygen content in the sputtering atmosphere. Received June 23, 2000. Accepted (revised) August 7, 2000
Keywords:.   Electrochromism   Mixed oxides   Vanadates  RF sputtering   Li diffusion coefficient.
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