Mo doping tungsten oxide large area electrochromic glass can be prepared by magnetron sputtering, spray coating, spray pyrolysis, or screen printing. Some experts have prepared large-area Mo-doped tungsten oxide electrochromic thin films by the above method, and made PMMA/PC quasi-solid electrolytes. The electrolyte and electrochromic thin film were assembled into devices by thermocompression film method. And the optical modulation range, response time, and cycle stability of the electrochromic device were tested.
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It is observed that bubbles gradually formed as the number of cycles increased, and the light modulation range and response time were gradually reduced. The changes of composition in the film and electrolyte were analyzed by electron spectrometer and infrared spectrometer, respectively. There is a strong interaction between Li+ and PC molecules, generating [LiPC]+, which has a lower minimum unoccupied molecular orbital than pure PC solvent. PC-ClO4-complex oxidation leads to deprotonation of PC and formation of HClO4. The presence of anions reduces the oxidative stability of the solvent and changes the decomposition kinetics and thermodynamics, resulting in the formation of gases and reduced cycle stability of the device.
