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Electrochromic devices operating with electrolytes based on boronate ester compounds and various alkali metal salts

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Author

  • Pierre-Yves Pennarun
  • Spiros Papaefthimiou
  • Panayiotis Yianoulis
  • Patric Jannasch

Summary, in English

Various polymer electrolytes based on boronate esters and different lithium and sodium salts have been evaluated in electrochromic (EC) devices based on WO3 films. The results showed that the ionic conductivity of the electrolytes was not the most important parameter for the colouration performance of these devices. The use of solid electrolytes containing LiClO4 resulted in a higher colouration performance than the corresponding liquid electrolytes, even though the latter exhibited a significantly higher conductivity. The results also showed that the transfer process at the interface between the WO3 layer and the electrolyte played a major role for the colouration process. The presence of Lewis acidic boronate ester groups in the electrolytes significantly improved the performance of the EC devices. The incorporation of boron in the composition of the electrolytes allowed the use of solid electrolytes instead of liquid ones, thus avoiding leakage problems. Furthermore, the highest colouration performance was found in EC devices operating with inexpensive salts. Because of their poor stability, the electrolytes based on LiCl and LiBr were not suitable, while those incorporating LiClO4 salt exhibited excellent overall characteristics.

Publishing year

2007

Language

English

Pages

330-341

Publication/Series

Solar Energy Materials and Solar Cells

Volume

91

Issue

4

Document type

Journal article

Publisher

Elsevier

Topic

  • Chemical Sciences

Keywords

  • salt dissociation
  • interfacial transfer
  • interfacial stabilisation
  • electrochromic devices
  • polymer electrolytes

Status

Published

ISBN/ISSN/Other

  • ISSN: 0927-0248