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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
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Flexible Polymer-Ionic Liquid Films for Supercapacitor Applications.

Christo Novakov1, Radostina Kalinova1, Svetlana Veleva2

  • 1Institute of Polymers, Bulgarian Academy of Sciences, Sofia, Acad. G. Bonchev Str., 103, 1113 Sofia, Bulgaria.

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|April 27, 2023
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Summary

Novel gel polymer electrolytes (GPEs) offer enhanced mechanical and thermal stability for supercapacitors. These crosslinked GPEs exhibit improved conductivity and stable performance, promising for high-temperature applications.

Keywords:
conductive polymer filmcross-linked separatorelectrochemical testsgel polymer electrolyteionic liquidsupercapacitor cell

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Gel polymer electrolytes (GPEs) are crucial for advanced energy storage devices.
  • Developing mechanically and thermally stable GPEs is essential for supercapacitor performance.
  • Ionic liquids (ILs) offer potential but require stabilization within polymer matrices.

Purpose of the Study:

  • To synthesize and characterize novel, mechanically and thermally stable GPEs.
  • To investigate the impact of crosslinking on GPE properties and performance.
  • To evaluate the suitability of these GPEs in supercapacitor applications.

Main Methods:

  • Solution casting technique for film preparation.
  • Immobilization of ionic liquids (ILs) within a polymer matrix.
  • Addition of crosslinking agents and radical initiators for stabilization.
  • Physicochemical characterization of GPE films.
  • Electrochemical testing in symmetric and hybrid supercapacitor cells.

Main Results:

  • Crosslinked GPE films demonstrated significantly improved mechanical and thermal stability.
  • Conductivity of crosslinked GPEs was an order of magnitude higher than non-crosslinked counterparts.
  • GPEs exhibited good and stable electrochemical performance when used as separators in supercapacitors.
  • The crosslinked films functioned effectively as both separator and electrolyte.

Conclusions:

  • The developed crosslinked GPEs offer superior stability and conductivity.
  • These GPEs are promising for high-temperature solid-state supercapacitors.
  • The crosslinked structure is key to achieving enhanced performance and stability.