LITHIATION STUDIES ON SOME TRANSITION-METAL OXIDES FOR AN ALL-SOLID THIN-FILM ELECTROCHROMIC SYSTEM

A study of the lithiation behavior of some transition metal oxides has been carried out. Using a dry method of lithiation changes in optical and electrical properties Of WO3, V2O5 and Nb2O5 films prepared under different conditions are studied. The optimum results and techniques are used for the fabrication of an all-solid electrochromic (EC) system based on the utilization of high coloration efficiency WO3 as the base electrochromic layer and the low coloration efficiency V2O5 as the counter electrode. LiBO2 has been used as the ion conducting layer. Such system has been operated over several hundred optical switching cycles without any degradation so far. All results indicate the suitability of the system for ''smart'' window application.