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Spiro-(1,1)-bipyrrolidinium tetrafluoroborate salt as high voltage electrolyte for electric double layer capacitors
作者:Xuewen Yu, Dianbo Ruan, Changcheng Wu, Jing Wang, Zhiqiang Shi*
關鍵字:Spiro-(1,10)-bipyrrolidinium tetrafluoroborate, Electrical conductivity, Withstand voltage, Activated carbon electrode, Supercapacitors
論文來源:期刊
具體來源:Journal of Power Sources
發表時間:2014年

A novel quaternary ammonium salt based on spiro-(1,10)-bipyrolidinium tetrafluoroborate (SBP-BF4) has been synthesized and dissolved in propylene carbonate (PC) with 1.5 mol/L (M) concentration for electric double-layer capacitors (EDLCs). The physic-chemical properties and electrochemical performance of SBP-BF4/PC electrolyte are investigated. Compared with the standard electrolyte1.5 MTEMABF4 inPC, the novel SBP-BF4/PC electrolyte exhibited much better electrochemical performance due to its smaller cation size, lower viscosity and higher conductivity. The specific discharge capacitance of activated carbon electrode based EDLCs using SBP-BF4/PC electrolyte is120 F/g, the energy density and power density can reach 31 kW/kg and 6938 W/kg, respectively, when the working voltage is 2.7 V and current density is 50 mA/g. The withstand voltage of activated carbon based EDLCs with SBP-BF4/PC electrolyte can reach to 3.2 V, where the stable discharge capacitance and energy density are121 F/g and 43 Wh/kg, respectively.

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