基于离子液体/石墨烯复合物的一种高性能混合电解质的制备与性质研究  

The preparation and supercapacitance properties of a high performance mixture electrolyte based on ionic liquid/graphene composites

作　　者：魏颖[1] 陶明松 朱耀锋 张庆国[1,2] WEI Ying;TAO Mingsong;ZHU Yaofeng;ZHANG Qingguo(College of Chemistry and Chemical Engineering,Bohai University,Jinzhou 121013,China;College of New Energy,Bohai University,Jinzhou 121013,China)

机构地区：[1]渤海大学化学化工学院,辽宁锦州121013 [2]渤海大学新能源学院,辽宁锦州121013

出　　处：《渤海大学学报（自然科学版）》2019年第4期306-314,共9页Journal of Bohai University:Natural Science Edition

基　　金：国家自然科学基金项目(No:21503020);辽宁省青年科技人才项目(No:LQ2019004)

摘　　要：采用一步电化学法在离子液体中电解剥离石墨棒制得1-丁基-3-甲基咪唑四氟硼酸盐离子液体/石墨烯([Bmim][BF4]/GNs)复合物,取上层复合物分散液与四氟硼酸螺环季铵盐的碳酸丙烯酯电解质(SBP-BF 4/PC,1.0mol/L)以不同的体积比进行混合制备[Bmim][BF4]/GNs+SBP-BF4/PC混合电解质(BGSP).通过循环伏安、交流阻抗和恒流充放电等方法对不同混合比的BGSP电解质在超级电容器中表现的电化学性能进行研究,结果表明,以体积比为1:1混合的BGSP电解质性能最佳,其电化学窗口近5V;充放电效率达到97.95%;比电容最高可达到163.16F/g,性能明显优于单纯的SBP-BF4/PC电解液.An ionic liquid/graphene composite was prepared from ionic liquid1-butyl-3-methylimidazolium tetrafluoroborate([Bmim][BF4])and graphite by using one-step electrolytic stripping method.Then,the upper dispersion of[Bmim][BF4]/GNS composite was separated and mixed in the electrolyte of spiro-(1,10)-bipyrrolidinium tetrafluoroborate salt and propylene carbonate(SBP-BF 4/PC,1.0 mol/L)with different volume ratios to obtain a new mixture electrolyte of [Bmim][BF4]/GNs+SBP-BF 4/PC(BGSP).The supercapacitance performances of the BGSP electrolytes with different composite concentrations were studied by methods of cyclic voltammetry,alternating current impedance,and constant current charge and discharge.The results showed that the BGSP electrolyte exhibited the best performance when the volume ratio of SBP-BF 4/PC and [Bmim][BF4]/GNs was 1:1.The working voltage window can reach 5V;the charge and discharge efficiency reaches 97.95%;the specific capacitance can reach 163.16 F/g,and the performances of BGSP are obviously better than those of SBP-BF4/PC electrolyte.

关 键 词：离子液体 电化学剥离 复合物 超级电容器 比电容 

分 类 号：O614.242[理学—无机化学]