The aim of this work is to check the possibility of using originally developed thin films of mixed oxides of cerium and vanadium as ion storage electrode within an electrochromic cell. Transmittance variation as function of the amount of lithium exchanged between the WO3 film and the Ce-V oxide film has been measured in the visible and near infrared spectrum. Also real time single wavelength measurements have been performed in different conditions to test the speed of coloration.