▎ 摘　　要

Flexible multi-color electrochromic V2O5 thin films have been prepared by electrochemical deposition on the double-layer Graphene/PET substrates. The deposited films have a layered structure with nano-crystals in the amorphous matrix, which contributes to an ultrahigh coloration efficiency of similar to 555.83 cm(2) C-1 @ 800 nm and a large transmittance modulation of 68.94% @ 800 nm. The large interlayer distance of 1.20 nm, good electrolyte penetration, and short lithium ion diffusion distance make some key electrochromic parameters competitive in our proposed devices. The low-temperature-processed V2O5 thin films on Graphene would provide us an opportunity to design and prepare flexible electrochromic devices. (C) 2018 The Electrochemical Society.