All-solid-state electrochromic devices based on the LiAlSiO4 electrolyte

Herein, LiAlSiO4 was used as electrolyte material for all-solid-state electrochromic devices for the first time, and an electrochromic device (ECD) with the structure of glass/ITO/NiO/Ta2O5/LiAlSiO4/Ta2O5/WO3/ITO was prepared by magnetron sputtering method. Since LiAlSiO4 electrolyte exhibits high transparency and good ionic conductivity, the ECD shows good electrochromic performance including: large optical transmittance modulations (50.8% at 586 nm, 64.1% at 1000 nm), good stability (optical modulation is still maintained at 81.4% (586 nm) and 89.0% (1000 nm) of initial state after 1000 cycles) and high coloration efficiency (60.3 cm2 C−1 at 586 nm, 150.6 cm2 C−1 at 1000 nm). Considering the low cost and abundance of Al and Si, LiAlSiO4 may be acknowledged as a sustainable electrolyte for future high-performance ECDs.