Abstract
The use of an asymmetric borate anion, difluoro(oxalato)borate (DFOB−), improves the solubility of the tetramethylammonium salt in propylene carbonate (PC) and the capacitances of electric double-layer capacitors (EDLCs). Electric conductivity of the PC solution containing tetramethylammonium difluoro(oxalato)borate (TMADFOB) was slightly lower than that obtained for tetraethylammonium tetrafluoroborate (TEABF4), but higher than those obtained for tetramethylammonium bis(oxalato)borate (TMABOB) and tetraethylammonium bis(oxalato)borate (TEABOB). The gravimetric capacitances of measurement cells increased with decreasing the ion sizes of the electrolytes. The PC solution containing TMADFOB afforded the highest gravimetric capacitance.
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