All-solid-state electrochromic devices based on ultra-thin Li3PO4 electrolyte

Abstract

We report the first use of an ultrathin Li₃PO₄ electrolyte (∼12 nm) in all-solid-state electrochromic devices. Its superior electron-blocking and short ion transport path enable large optical modulation (69.5%), fast coloration/bleaching times (9.7/2.5s), and excellent cycling stability—offering a promising route to address key challenges in electrolyte design.