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Polyurethane-Based Gel Electrolyte for Application in Flexible Electrochromic Devices.

Christopher Johannes1, Michael Hartung1, Hans-Peter Heim1

  • 1Polymer Engineering, Institute of Material Engineering, University of Kassel, 34125 Kassel, Germany.

Polymers
|July 9, 2022
PubMed
Summary
This summary is machine-generated.

A new polyurethane gel electrolyte was developed for flexible electrochromic devices (ECDs). Optimal ion conductivity and flexibility were achieved by adjusting solvent content and matrix stoichiometry, enabling successful demonstrator device fabrication.

Keywords:
electrochromic deviceelectrolyteflexible

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Flexible electrochromic devices (ECDs) require advanced electrolytes for enhanced performance.
  • Polyurethane-based materials offer potential for durable and adaptable electrolyte applications.

Purpose of the Study:

  • To develop and characterize a novel polyurethane-based gel electrolyte for flexible ECDs.
  • To investigate the impact of solvent, salt content, and matrix stoichiometry on electrolyte properties.
  • To optimize the electrolyte for ion conductivity, mechanical flexibility, and optical characteristics.

Main Methods:

  • Synthesis of a polyurethane-based gel electrolyte using Hexamethylen-1,6-diisocyanat (HDI) and a trifunctional polyetherpolyol.
  • Systematic variation of solvent content, salt concentration, and polyurethane matrix stoichiometry.
  • Evaluation of curing behavior, ion conductivity, optical transmittance, and mechanical properties.
  • Fabrication and testing of a demonstrator flexible ECD.

Main Results:

  • Solvent content significantly influenced ion conductivity and mechanical properties.
  • An understoichiometric matrix ratio (0.85) enhanced ion conductivity (10⁻⁵ S/cm) and flexibility but negatively impacted optical properties.
  • Salt content showed minimal influence within the tested range.
  • The developed electrolyte demonstrated high flexibility, transmittance, and color neutrality.

Conclusions:

  • The novel polyurethane gel electrolyte is suitable for flexible ECD applications due to its favorable properties.
  • Optimization of solvent content and matrix stoichiometry is crucial for balancing performance metrics.
  • Successful fabrication of a demonstrator ECD validates the electrolyte's practical applicability.