Research progress of anodic electrochromic materials

Electrochromic technology has been widely used in many fields, such as building windows and car rear-view mirrors. Ion storage layers (generally anodic electrochromic materials) are significant for improving the performance of electrochromic devices and realizing the application of the technology. Its role is to store and supply the ions needed for the color change reaction, maintaining the charge balance of the entire electrochromic process. At present, the most typical anodic electrochromic material is nickel oxide(NiO). The cheap NiO film has high coloration efficiency and large range of optical transmittance, so it is widely used in the electrochromic technology. This paper overviews the research progress of anodic electrochromic materials in recent years, including material classification, working principle and characteristic requirement, and also introduces the film preparation methods. Developing simple and cost-effective film preparation process is the research focus of electrochromic technology. At the same time, some methods for improving the performance of anodic electrochromic materials, and prospects the development trend are introduced.