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Molecular and Ionic Solids

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Polymerizable Ionic Liquids for Solid-State Polymer Electrolytes.

Robert Löwe1,2, Thomas Hanemann3,4, Andreas Hofmann5

  • 1Institute for Applied Materials, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany. robert.loewe@kit.edu.

Molecules (Basel, Switzerland)
|January 20, 2019
PubMed
Summary
This summary is machine-generated.

Eight novel polymerizable ionic liquids were synthesized for energy storage. Alkyl chain length and polymerizable group structure significantly impact properties like ionic conductivity and viscosity.

Keywords:
conductivitydensitypolymerizable ionic liquidsproperty-structure relationshipviscosity

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Ionic liquids (ILs) are promising electrolytes for energy storage devices due to their unique properties.
  • Polymerizable ionic liquids (PILs) offer enhanced mechanical stability and processability for solid-state electrolytes.
  • Developing novel PILs with tailored properties is crucial for advancing energy storage technologies.

Purpose of the Study:

  • To synthesize and characterize new polymerizable ammonium-TFSI ionic liquids.
  • To investigate the influence of structural variations on the physicochemical properties of these ILs.
  • To evaluate their potential for application in energy storage devices.

Main Methods:

  • Synthesis of eight new polymerizable ammonium-TFSI ionic liquids with methacrylate or acrylate groups.
  • Characterization using NMR and IR spectroscopy.
  • Thermal analysis via Differential Scanning Calorimetry (DSC).
  • Measurement of density, viscosity, and ionic conductivity at 25 °C.

Main Results:

  • High yields achieved for precursor and ionic liquid synthesis.
  • Physicochemical properties significantly influenced by alkyl chain length and polymerizable group structure.
  • Ionic conductivity ranged from 0.080 to 0.264 mS cm⁻¹.
  • Viscosity values varied between 0.762 and 1.522 Pa s.

Conclusions:

  • The synthesized ammonium-TFSI ionic liquids are suitable for energy storage applications.
  • Structural modifications offer a pathway to tune IL properties for specific device requirements.
  • Further research can optimize these PILs for improved electrochemical performance.