Ce02-Ti02 sol-ge! coatings are well known as Li-ion storage electrode in electrochromic (EC) devices of the form glass! TEL W03! electrolyte! Ce02-Ti02! TEl glass (TE: transparent electrode, e.g. Sn02:F, FTO). The charge capacity of the Ce02-Ti02 coating is a limiting factor to get a high coloration intensity of such devices. In order to improve the charge capacity ofthese electrodes, new routes for the preparation ofthick porous Ce02-Ti02 sol-gel layers were tested.One route was the preparation of thick porous Ti02 coatings on a conducting glass support (FTO) using a solution of colloidal Ti02 particles. After heat treatment at temperatures up to 550°C the coatings were soaked in a solution of a cerium-TV (Ce(NH4)2(N03)6) or a cerium-ITT salt (Ce(N03)3 6H20) and heat treated again. Another route was the preparation of sols by mixing a solution ofthe cerium-TV or the cerium-ITT salt or a colloidal Ce02-sol with the colloidal solution of Ti02. 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 LiClO4 in propylene carbonate electrolyte. Although thick porous single coatings could be obtained, typically 450 nm for Ti02 and 600 nm for cerium-titanium oxide, the intercalated and deintercalated 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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