INVESTIGATIONS ON COUNTER ELECTRODE MATERIALS FOR SOLID-STATE ELECTROCHROMIC SYSTEMS

Investigations have been carried out on mixed oxide systems (WO3)x(Li2O)y(MO)z, with M = Fe, Mn, V, Ce, Sb or Nb and 0.3 < x < 0.49, 0.21 < y < 0.38, and 0.26 < z < 0.43. Cyclic voltammetric measurements in a 1 N LiClO4 - propylene carbonate electrolyte with an Ag - AgCl-reference electrode were used to study the insertion of Li+ ions into, and the extraction of the inserted ions from, the proposed compounds. However, the main problem is still the insufficient transparency of these materials. Problems concerning preparation of the thin film oxides are also noted.