A Comparative Study of Imidazolium-Based Ionic Liquid-Single-Walled Carbon Nanotube Composites with Enhanced Conductivity Properties for Supercapacitor Applications
A Comparative Study of Imidazolium-Based Ionic Liquid-Single-Walled Carbon Nanotube Composites with Enhanced Conductivity Properties for Supercapacitor Applications
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用于超级电容器应用的具有增强导电性能的咪唑基离子液体-单壁碳纳米管复合材料的比较研究
DOI：
10.1149/09810.0073ecst
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Wishart, James F.
中科院分区：
文献类型：
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作者：
Hemraj-Benny, Tirandai;Lall-Ramnarine, Sharon I.;Suarez, Sophia;Paterno, Domenec;Ramdihal, Jasodra D.;Sumner, Rawlric;Urena, Katelyn;Wishart, James F.
制备了含有单壁碳纳米管(SWCNTs)的离子液体(ILS)混合物，并对其进行了表征，以获得用于超级电容器等储能设备的具有最佳传输性能的电解质。含有不同官能度侧链阳离子的咪唑ILS与双(三氟甲基磺酰基)酰胺(NTF2-)或双(氟磺酰基)酰胺(FSA-)阴离子偶联，用于含有高达5wt%的SWCNTs的混合物中。在纳米管负载量为2wt%及以上时，尽管混合物具有极高的粘度，但仍表现出比纯ILS更高的电导率。5wt%的负载量产生了非常高的电导率，对温度依赖性的研究表明，在2wt%到5wt%的负载量之间，电荷传输机制发生了变化。在负载量为5wt%时，含有NTf2-离子的离子液体的电导率最高(在25℃时达到540ms/cm)。这些结果可以为改进的储能设备的开发做出重大贡献。
Mixtures of ionic liquids (ILs) containing single-walled carbon nanotubes (SWCNTs) were prepared and characterized to obtain electrolytes with optimized transport properties for use in energy storage devices such as supercapacitors. Imidazolium ILs bearing cations with side chains of different functionality, coupled with bis (trifluoromethylsulfonyl) amide (NTf2-) or bis (fluorosulfonyl)-amide (FSA-) anions, were used in mixtures containing up to 5 wt% SWCNTs. At and above 2 wt% nanotube loading, the mixtures exhibited higher conductivities than the pure ILs, in spite of the extremely high viscosities. Loadings of 5 wt% produced very high conductivities, and studies of the temperature dependence indicated a change in the charge transport mechanism between 2 and 5 wt% loading. At 5 wt% loading, the highest conductivities (up to 540 mS/cm at 25 C) were obtained for the ILs containing the NTf2-anion. These results can significantly contribute to the development of improved energy storage devices.