摘要
采用两步法合成功能化离子液体1-甲基-3-丁基咪唑三氟乙酸盐离子液体([Bmim][CF_3CO_2]),并将其与有机电解质四氟硼酸螺环季铵盐([(C_4H_8)_2N][BF_4])组成不同浓度配比的新型混合电解液。采用活性炭为电极,组装成超级电容器,通过循环伏安、恒流充放电、交流阻抗等方法对其电化学性能进行了研究。结果显示:混合电解液的浓度为2.06 mol/L时的性能最优,这种新型的混合电解液25℃时电导率为3.99×10^(–3) S/cm,电化学窗口可达2.7 V,内阻0.96?,经过1 000次充、放电循环后仍可保留98%的初始比电容,说明该混合电解液具有突出的电化学性能和巨大的市场应用潜力。
A new functional ionic liquid （IL） 1-methyl-3-butylimidazole trifluoroacetic acid salt was synthesized bytwo-step method, and the mixed electrolytes were prepared from the IL and spiro cyclic quaternary ammoniumtetrafluoroborate with different concentration ratios. The supercapacitors composed of the activated carbon electrode andthe mixed electrolytes were assembled. The cyclic voltammograms, constant current charge and discharge, AC impedanceelectrochemical performance of supercapacitors were studied. The results show that the mixed electrolytes has optimalperformance when the concentration is 2.06 mol/L. The cyclability is 98% capacitance retention after 1 000 cycles, theelectrochemical window is 2.7 V, the internal resistance is 0.96 Ω, and the electrolyte conductivity is 3.99×10–3 S/cm at25 ℃. Thus the mixed electrolyte at concentration of 2.06 mol/L has good electrochemical performance and considerableapplication potential.
出处
《电子元件与材料》
CAS
CSCD
2016年第6期35-39,共5页
Electronic Components And Materials
基金
国家自然基金项目资助(No.21003081
21373002
21503020)
辽宁省高校优秀人才支持计划(No.LJQ2013116)
关键词
超级电容器
离子液体
电解液
1-甲基-3-丁基咪唑三氟乙酸盐
四氟硼酸螺环季铵盐
活性炭
supercapacitors
ionic liquid
electrolyte
1-methyl-3-butylimidazole trifluoroacetic acid salt
spiro cyclicquaternary ammonium tetrafluoroborate
activated carbon WEI Ying1, ZHANG Xuelei1, ZHANG Xinyuan1, CHEN Tao1, ZHANG Qingguo1,2（1. College of Chemistry and Chemical Engineering, Bohai University, Jinzhou 121013, Liaoning Province, China
2. College of New Energy, Bohai University, Jinzhou 121013, Liaoning Province, China
）
