Electrochromic devices cycling stability

Stability tests performed in sandwich-type cells containing the dyes adsorbed on Sn02/Sb electrodes demonstrated a high stability, with optical density changes lower than 2% after cycling the electrochromic device 20000 times between -0.5 and +0.5 V. 

The electrochromic properties of PANi from the visible to the microwave region can be improved by copolymerization of aniline with other aromatic amines such as diphenyl amine and A,A -diphenyl-benzidine. Devices with solid electrolytes, rapid switching, high contrast, and acceptable cycling stability have been discovered and successfully exploited by Chandrasekhar. 

Gas discharge displays, electrochromic and electroluminescent devices [161] are used for similar purposes as liquid crystals, but in place of the liquid crystal, a plasma (gas discharge like in a Ne tube) or solid state materials are used. The optical and electrical requirements are very similar. With gas discharge display electrodes, a high temperature stability is also required (450° C cycling). 

Much of the current research in the field of electrochromic polymer focus on increasing the lifetimes of these devices, along with the switching speeds and environmental stability. Devices incorporating these electrochromic polymers have demonstrated fast switching, with the devices fully switching at subsecond rates [15,151]. These devices have also been shown to exhibit long lifetimes with values that reach into millions of cycles reported [35,254,255]. 

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