Nano Tungsten Oxide Applied for Electrochromic Film

Nano tungsten oxide may be used to prepare an electrochromic film, which may be used to produce a high-performance electrochromic glass, that is, an environmentally-friendly smart glass with heat insulating performance. According to experts, a complete electrochromic glass assembly consists of five layers: ITO conductive glass layer, electrochromic layer, ion conductor layer, complementary electrochromic layer, ITO conductive glass layer. The three layer film in the middle is the core material.

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Wherein, the production technology of ITO conductive glass is mature. The most studied electrochromic layer is WO3 electrochromic thin film. The ion conductor layer is a solid polymer lithium ion conductor material. PEO is the earliest and most extensive polymer electrolyte matrix material, which can form a stable complex with lithium salt without any organic plasticizer and has higher conductivity. PEO-LiClO4 is a more common solid electrolyte film material. Complementary electrochromic layer, also known as ion storage layer, is mainly composed of TiO2 film, which has the characteristics of small discoloration, high optical transmittance, good chemical stability and high mechanical properties, so it is considered to be the best material for the preparation of complementary electrochromic layers for electrochromic devices.

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