Abstract
The use of oxalatoborate ions, difluoro(oxalato)borate (DFOB−) and bis(oxalato)borate (BOB−), improved the solubility of the tetramethylammonium compounds in propylene carbonate (PC) and increased the capacitances of electric double-layer capacitors (EDLCs). Ionic conductivities of tetramethylammonium difluoro(oxalato)borate (TMADFOB) solutions in PC were slightly lower than that of tetraethylammonium tetrafluoroborate (TEABF4) solutions. However, the conductivities were higher than those of tetramethylammonium bis(oxalato)borate (TMABOB) and tetraethylammonium bis(oxalato)borate (TEABOB) solutions. We have used a transmission-line network of finite length as the equivalent circuit of the average pore of an activated carbon electrode. The equation we derived has enough flexibility to show the effect of double-layer capacitance on the length and shape of a single pore. We evaluated the performance of EDLCs by comparing the theoretical and the experimental discharge curves. The TMADFOB solution in PC afforded the highest capacitance.
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