Ion Transport Modulation for Enhanced Color Contrast in All-Solid-State Polymeric Electrochromic Devices

Solid-state electrochemical devices using ion-conductive films provide distinct advantages for a range of devices, including all-solid-state electrochromic (EC) devices and batteries. However, the properties of these solid state EC devices, including color contrast, driving voltage, and response time, are highly contingent on the precise modulation of ion transport and charge balance between the electrodes, necessitating stringent modulation over these processes. In this study, we present all-solid-state EC devices comprising a polymeric electrochromic film, charge-balancing counter electrodes, and a polymer electrolyte framework, achieving a high color contrast and fast response times at a low switching voltage between +1 V and -1 V. The enhanced electrochromic properties in these devices were attributed to the modulated ion transport within the device, which ensures an optimized charge balance across the device.