High coloration performance of electrochromic devices assembled with electrolytes based on a branched boronate ester polymer and lithium perchlorate salt

摘要: An amorphous, colorless, and highly transparent polymer containing boron atoms in its branched chain architecture was synthesised from trioxide, poly(ethylene glycol) (PEG) methoxy end-capped PEG. Electrolytes based on this different concentrations of lithium perchlorate (LiClO4) were prepared characterised by impedance spectroscopy, calorimetry thermogravimetry. The results showed a thermal stability up to at least 150 °C, conductivities reaching 10−4 S cm−1 room temperature. latter value much lower than that measured for reference liquid electrolyte propylene carbonate (PC) LiClO4. boron-containing electrolytes further evaluated electrochromic devices fabricated using electronically conducting SnO2/F electrodes electrochromically active tungsten oxide (WO3) films. Their performance compared with corresponding assembled gel LiClO4 salt PC. best coloration observed the device incorporating having molar ratio [B]/[ClO4] equal 3:1. efficiency 59 cm2 C−1 device. Cyclic voltammetry not affected continuous cycling, 34 times less injected electric charge needed order obtain same level (0.31 mC 10.5 mC, respectively). In addition, improved durability optical properties former when voltage increased 4 V, which very high contrast 7700. (Less)