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Preparation of polyvinylidene fluoride-co-hexafluoropropylene-based polymer gel electrolyte and its performance evaluation for application in EDLCs

  • Mukta Tripathi
  • Santosh M Bobade
  • Anuj KumarEmail author
Article
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Abstract

Polymer gel electrolyte (PGE) film is prepared by incorporating polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) as polymer, ethylene carbonate (EC)-propylene carbonate (PC) as plasticizers and tetraethylammonium tetrafluoroborate (\(\hbox {TEABF}_{4}\)) as salt using solution cast technique. By varying weight percentages of EC-PC-\(\hbox {TEABF}_{4}\) into a host polymer, different samples of PGE were prepared, and the concentration of EC-PC-\(\hbox {TEABF}_{4}\) was optimized for maximum conductivity, and stability of the prepared film. The maximum ionic conductivity of the order of \(4.9\times 10^{-3}\,\hbox {S cm}^{-1}\) was determined for 80 wt% of [EC-PC (1:1 v/v)-\(\hbox {TEABF}_{4}\) (1.0 M)]. From the conductivity as a function of temperature, activation energy \({E}_{\mathrm{a}}\) was calculated and it is about 0.06 eV. Overall, the amorphous structure was confirmed by X-ray diffraction analysis. Dielectric and impedance spectroscopic analysis was also carried out to understand the electrical behaviour of electrolyte using modified Debye’s function. An ionic character of prepared electrolyte was confirmed from DC polarization method. The ionic transference number of 0.91 was calculated from the data while the electrical potential stability window was found to be 3.8 V. The electrical performance of prepared PGE was examined by fabricating electrical double-layer capacitor (EDLC). In a supercapacitor, commercially procured activated carbon electrodes were employed. The specific capacitance of EDLC cell is found to be \(\sim \)60 mF cm\(^{-2}\), and equivalent single-electrode capacitance is about 39 F g\(^{-1}\).

Keywords

Polymer gel electrolyte dielectric studies XRD electrical double-layer capacitor 

Notes

Acknowledgements

Financial assistance to one of the author Mukta Tripathi from Jaypee University of Engineering and Technology, Guna (MP) is gratefully acknowledged. The authors thank Professor D K Rai, JIIT, Noida (UP) for providing XRD characterization facility.

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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.Department of PhysicsMarwadi UniversityRajkotIndia
  2. 2.Department of PhysicsJaypee University of Engineering and TechnologyGunaIndia
  3. 3.Department of PhysicsC.C.S. UniversityMeerutIndia

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