中文摘要：

采用两步法合成了1-戊基-3-甲基咪唑硫氰酸盐（[Pmim][SCN]） 新型离子液体电解质，测定了该电解质的物理化学性质。并用这种新型离子液体电解质与活性炭电极组装成模拟超级电容器，研究了所制超级电容器的电化学性能。结果表明：所制离子液体电导率较高，密度和表面张力都随温度升高而减小，模拟超级电容器的工作电压可达4.0 V，比电容可达421.05 F/cm3，充放电效率为96.3 %，且该离子液体具有很好的与常见有机溶剂互溶的能力，具有成为超级电容器用电解质的应用潜力。

英文摘要：

A novel ionic liquid electrolyte of 1-Pentyl-3-methylimidazolium thiocyanate salts （[Pmim][SCN]） was synthesized by two-steps methods. The fundamental physico-chemical properties of the ionic liquid electrolyte were investigated. A supercapacitor composed of the activated carbon electrode and the ionic liquid electrolyte was prepared. The electrochemical performance of the supercapacitor was studied. The results show that prepared [Pmim][SCN] has higher electrical conductivity than common ionic liquids, and the density and the surface tension of the ionic liquid decrease with the increase of temperature. The working voltage of the supercapacitor reaches to 4.0 V. The specific capacitance of the supercapacitor is as high as 421.05 F/cm3, and the charge-discharge efficiency is 96.3 %. In addition, the prepared ionic liquid is soluble in most conventional solvents, which show this ionic liquid electrolyte has a great potential in application of supercapacitor.