The electrolyte is an important component in the electrochromic devices (ECD), to provide the necessary compensation ions for the electrochromic reactions, and its performance directly affects the response speed, the optical contrast, and the cycle life of the ECD. The polymer gel electrolytes are widely used in the ECD because of the ease of processing and packing, as well as the good ionic conductivity. This paper reviews the research progress of polymer gel electrolytes for the ECD, especially, the applications, the problems and the development proposals of the novel ionic gel and polyionic gel electrolytes in the ECD.

electrochromism  /  gel electrolyte  /  ionic liquid  /  polyionic liquid