Preparation and device performance study of PVB/PMMA/PC/LiTFSI solid state electrolyte membrane

Electrochromic devices rapidly color and fade at ±3.0 V • The transmittance of electrochromic devices at 550 nm wavelength is 77.8% • The optical contrast of electrochromic devices is as high as 54.5%. A solid-state electrolyte film composed of PVB/PC/PMMA/LiTFSI (BAP) was prepared through hot-pressing, and using this electrolyte film as the electrolyte layer, a (glass/ITO/WO 3 /BPA/ITO/glass) laminated electrochromic safety glass device was fabricated. Under ±3.0 V voltage, the device achieves rapid coloration and fading, with an excellent optical contrast of up to 77.8%, indicating its broad prospects for application in energy-efficient smart electrochromic windows.