Fabrication and evaluation of an electrochemical double-layer capacitor with natural graphite electrodes and magnesium trifluoromethanesulfonate–based gel polymer electrolyte

  • K. A. Janani K. Karunarathne
  • Kumudu S. PereraEmail author
  • Kamal P. Vidanapathirana
  • Jagath C. Pitawela
Original Paper


Super capacitors have emerged as a promising substitute for batteries and conventional capacitors which have played a key role as energy storage devices. The continuous concerns over green and low-cost concepts have motivated the consideration of natural materials as they are non-toxic and low cost. On the other hand, the realization of the dangers of liquid electrolytes has promoted the attention on gel polymer electrolytes to be used for devices. The prime objective of the present study is fabricating an electrochemical double-layer capacitor (EDLC) which is a type of super capacitor make using natural graphite and a gel polymer electrolyte. The electrolyte having the composition 0.5 PVdF-Co-HFP:0.70 MgTF:1 EC:1 DEC showed an optimum room temperature conductivity of 3.45 × 10−3 S cm−1. It was purely an ionic conductor having improved amorphous nature. EDLCs were fabricated with two identical natural graphite electrodes. Evaluation of EDLC was carried out using cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge-discharge test. The proposed electrode/electrolyte combination seemed to be suitable for the application in EDLCs. Specific capacitance values obtained are satisfactory to carry forward further investigations to improve performance.


Electrochemical double-layer capacitor Impedance XRD analysis Specific capacitance 


Funding information

This study was financially sponsored by Wayamba University of Sri Lanka via the research grant, SRHDC/RP/04/17/01. In addition, authors wish to acknowledge the assistance extended by National Research Council, Sri Lanka (17-006) and National Science Foundation, Sri Lanka (RG/2017/BS/02, RG/2015/EQ/07).


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • K. A. Janani K. Karunarathne
    • 1
  • Kumudu S. Perera
    • 2
    Email author
  • Kamal P. Vidanapathirana
    • 2
  • Jagath C. Pitawela
    • 1
  1. 1.Department of Science and TechnologyUva Wellassa University of Sri LankaBadullaSri Lanka
  2. 2.Department of ElectronicsWayamba University of Sri LankaKuliyapitiyaSri Lanka

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