Electrochromic composition and electrochromic device using same

An electrochromic device comprising an electrochromic composition, the electrochromic composition comprising:

• a solvent comprising one of propylene carbonate, N-methylpyrrolidone, polyethylene glycol, or an ester thereof;
• a cathodic component in the form of a quaternary salt of dipyridine, the cathodic component comprising:
• a quaternary salt comprising one of 1,1′-dimethyl-4,4′-dipyridinium, 1,1′-diethyl-4,4′-dipyridinium or 1,1′-dibenzyl-4,4′-dipyridinium and one of CF3SO3− or (CF3SO2)2N−, the quaternary salt being present at a concentration of 0.4-3.6 mass % on the basis of a total mass of the electrochromic composition, and
• a balance comprising the solvent;
• an anodic component in the form of a ferrocene derivative, the anodic component comprising:
• ferrocene or 1,1′-diethylferrocene, at a concentration of 0.3-3.0 mass % on the basis of a total mass of the electrochromic composition, and
• a balance comprising the solvent;
• a polymeric thickener comprising a copolymer of methylacrylate and one of a polylactic acid or poly-3-hydroxybutyrate
• at least one antioxidant comprising ionol;
• and
• an ultraviolet filter comprising a cinnamate.