Tungsten oxide powder may not only be applied for preparing thermal insulation film, which mainly exhibits its photochromic properties, but also be used for producing electrochromic devices, mainly exhibiting their electrochromic properties.
The electrochromic device is essentially a transparent rechargeable thin film battery, that is, a rocking battery, whose working principle has a high similarity to the working principle of lithium battery. The coloring and fading process of the electrochromic device corresponds to the charging and discharging process of the lithium battery. At the same time, electrochromic materials also pursue higher color conversion rates, which is similar to the fast charge and discharge characteristics of lithium batteries (i.e., higher charge and discharge rate performance). Among them, increasing the diffusion rate of ions is an effective way to improve such performance. In fact, this method is applicable to the improvement of the electrochromic properties of tungsten oxide. And what you may have known is that the diffusion coefficient and migration path of ions are the two main factors affecting the electrochromic properties of tungsten oxide.
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