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Surface Analyses of PVDF/NMP/[EMIM][TFSI] Solid Polymer Electrolyte.

Petr Sedlak1, Dinara Sobola1,2, Adam Gajdos1

  • 1Faculty of Electrical Engineering and Communications, Brno University of Technology, Technicka 10, 616 00 Brno, Czech Republic.

Polymers
|August 28, 2021
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Summary
This summary is machine-generated.

Optimizing thermal treatment of solid polymer electrolytes (SPEs) influences their morphology and composition. Faster solvent evaporation during processing leads to increased ionic liquid concentration on the surface, crucial for battery performance.

Keywords:
Fourier transform infrared spectroscopyRaman spectroscopyX-ray photoelectron spectroscopycrystallinityimidazolium ionic liquidspoly-(vinylidene fluoride)secondary ion mass spectroscopysolid polymer electrolytesolvent evaporation

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Solid polymer electrolytes (SPEs) are crucial for advanced battery technologies.
  • Understanding the processing-structure-property relationships of SPEs is vital for performance optimization.
  • PVDF/NMP/[EMIM][TFSI] is a promising ionic liquid-based SPE system.

Purpose of the Study:

  • To investigate the impact of thermal treatment conditions on SPE properties.
  • To correlate processing parameters with surface morphology, phase, and chemical composition.
  • To optimize SPEs for enhanced electrochemical applications.

Main Methods:

  • Scanning electron microscopy (SEM) for surface morphology.
  • Raman spectroscopy and Fourier transform infrared spectroscopy (FTIR) for phase and chemical analysis.
  • Differential scanning calorimetry (DSC), X-ray photoelectron spectroscopy (XPS), and time-of-flight secondary ion mass spectroscopy (ToF-SIMS) for thermal and surface composition analysis.

Main Results:

  • Electrolyte morphology features spherulites whose size increases with solvent evaporation rate.
  • Raman mapping reveals semicrystalline spherulites and amorphous inter-spherulite regions.
  • FTIR and Raman indicate dominance of the β-phase, while DSC shows decreased crystallinity with increased evaporation rate.
  • XPS and ToF-SIMS confirm surface composition approaches that of the ionic liquid at higher evaporation rates.

Conclusions:

  • Thermal treatment and solvent evaporation rate significantly influence SPE structure and surface chemistry.
  • Controlled solvent evaporation can enhance ionic liquid concentration at the SPE surface.
  • Findings provide insights for tailoring SPEs for improved electrochemical device performance.