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. 2020 May 7;56(37):5018-5021.
doi: 10.1039/d0cc00697a. Epub 2020 Apr 3.

All Solid State Electrochromic Devices Based on the LiF Electrolyte

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All Solid State Electrochromic Devices Based on the LiF Electrolyte

Xi Chen et al. Chem Commun (Camb). .

Abstract

The unsafe deposition process and slow deposition rate of the electrolyte layers are the main obstacles for electrochromic devices (ECDs) toward commercial application. In this work, an ECD with a structure of glass/ITO/WO3/LiF/NiO/ITO has been prepared by electron beam and resistance evaporation methods. The LiF electrolyte is deposited by resistance evaporation with the LiF particles and shows promising potential as the Li+ based electrolyte in ECDs owing to its high transparency and good ionic conductivity. The ECD shows a fast response (4.0 s for bleaching and 9.6 s for coloring), large optical transmittance modulations (∼58.9% at 625 nm, 100 s for coloring), good stability and high coloration efficiency (88.5 cm2 C-1). This work not only indicates that LiF can be used as a Li+ based electrolyte in an ECD, but also paves a new way to fast and safe preparation of ECDs with high performance.

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