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Conducting and interface characterization of carbonate-type organic electrolytes containing EMImBF4 as an additive against activated carbon electrode

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2015, 16(1), pp.51-56
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General

김민경 1 김경민 1 Kim Seok 1

1부산대학교

Accredited

ABSTRACT

Carbonate-type organic electrolytes were prepared using propylene carbonate (PC) and dimethylcarbonate (DMC) as a solvent, quaternary ammonium salts, and by adding differentcontents of 1-ethyl-3-methyl imidazolium tetrafluoroborate (EMImBF4). Cyclic voltammetryand linear sweep voltammetry were performed to analyze conducting behaviors. The surfacecharacterizations were analyzed by scanning electron microscopy method and X-ray photoelectronspectroscopy. From the experimental results, increasing the EMImBF4 content increasedthe ionic conductivity and reduced bulk resistance and interfacial resistance. In particular,after adding 15 vol% EMImBF4 in 0.2 M SBPBF4 PC/DMC electrolyte, the organicelectrolyte showed superior capacitance and interfacial resistance. However, when EMImBF4content exceeded 15 vol%, the capacitance was saturated and the voltage range decreased.

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This paper was written with support from the National Research Foundation of Korea.