Performance of Electric Double Layer Capacitors with Gel Electrolytes Containing an Asymmetric Ammonium Salt

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  • ISHIKAWA Masashi
    Department of Applied Chemistry & Chemical Engineering, Faculty of Engineering, Yamaguchi University
  • YAMAMOTO Leo
    Department of Applied Chemistry & Chemical Engineering, Faculty of Engineering, Yamaguchi University
  • MORITA Masayuki
    Department of Applied Chemistry & Chemical Engineering, Faculty of Engineering, Yamaguchi University
  • ANDO Yasuo
    Central Research Laboratory, Meidensha Corporation

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<p>Polymer gel electrolytes, composed of poly(vinylidene fluoride) (PVdF) and propylene carbonate (PC) as a plasticizer with the asymmetric ammonium salt triethylmethylammonium tetrafluoroborate (TEMABF4), have been applied to electric double layer capacitors (EDLCs) with activated carbon cloth electrodes. The present capacitors with TEMABF4 have a higher capacitance, better coulombic efficiency, and lower leak current than those with a typical electrolytic salt, tetraethylammonium tetrafluoroborate (TEABF4). Ac impedance measurements show that the capacitors with TEMABF4 have not only lower electrolyte-bulk resistances but also lower electrolyte/electrode-interface resistances in comparison with the capacitors with TEABF4.</p>

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  • Electrochemistry

    Electrochemistry 69 (6), 437-439, 2001-06-05

    公益社団法人　電気化学会

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