WO3 electrochromic film is an important EC layer material for preparing electrochromic glass, that is, an electrochromic device. In general, in the actual preparation of electrochromic devices, electrochromic materials are required to have the characteristics of stable chemical properties, rapid color change response, high cycle life, reversible color change, highly sensitive color change, memory ding and good electrochemical redox reversibility. But why the light transmission rate of electrochromic glass decreases when it bleaches after repeated use?
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This is because lithium ions are deposited in the tungsten trioxide film due to their multiple insertion and extraction. Some experts have used XPS and XRD analysis to find that when a large amount of lithium is embedded in the film, tungsten bronze is converted into lithium tungstate, and the formation of lithium tungstate is the main reason for the deterioration of the electrochromic performance of the WOx film. That is to say, the cycle life of such smart glass is relatively low, which is the main problem to be solved.
