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'Bucky gel' of multiwalled carbon nanotubes as electrodes for high performance, flexible electric double layer capacitors

机译：多壁碳纳米管的“ Bucky凝胶”作为电极，用于高性能，柔性双电层电容器

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We report the preparation of a gelled form of multiwalled carbon nanotubes (MWCNTs) with an ionic liquid 1-butyl-1-methyl pyrrolidinium bis(trifluoromethane sulfonyl)imide (BMPTFSI)), referred to as 'bucky gel', to be used as binderless electrodes in electrical double layer capacitors (EDLCs). The characteristics of gelled MWCNTs are compared with pristine MWCNTs using transmission electron microscopy, x-ray diffraction and Raman studies. A gel polymer electrolyte film consisting of a blend of poly(vinylidene fluoride-co-hexafluoropropylene) and BMPTFSI, exhibiting a room temperature ionic conductivity of 1.5 × 10~(-3) S cm~(-1), shows its suitability as an electrolyte/separator in flexible EDLCs. The performance of EDLCs, assembled with bucky gel electrodes, using impedance spectroscopy, cyclic voltammetry and charge-discharge analyses, are compared with those fabricated with pristine MWCNT-electrodes. An improvement in specific capacitance (from 19.6 to 51.3 F g~(-1)) is noted when pristine MWCNTs are replaced by gelled MWCNT-binderless electrodes. Although the rate performance of the EDLCs with gelled MWCNT-electrodes is reduced, the pulse power of the device is sufficiently high (~10.5 kW kg~(-1)). The gelled electrodes offer improvements in energy and power densities from 2.8 to 8.0 Wh kg~(-1) and 2.0 to 4.7 kW kg~(-1), respectively. Studies indicate that the gel formation of MWCNTs with ionic liquid is an excellent route to obtain high-performance EDLCs.
机译：我们报告了与离子液体1-丁基-1-甲基吡咯烷鎓双（三氟甲烷磺酰基）酰亚胺（BMPTFSI））一起使用的多壁碳纳米管（MWCNT）的凝胶形式的制备，该凝胶被称为“巴基凝胶”。双电层电容器（EDLC）中的无粘合剂电极。使用透射电子显微镜，X射线衍射和拉曼研究将凝胶状MWCNT的特性与原始MWCNT进行了比较。由聚偏二氟乙烯-共六氟丙烯和BMPTFSI的混合物组成的凝胶聚合物电解质膜，室温离子电导率为1.5×10〜（-3）S cm〜（-1），显示出其适用于柔性EDLC中的电解质/隔膜。 EDLC与bucky凝胶电极组装在一起的性能，使用阻抗谱，循环伏安法和充放电分析，与使用原始MWCNT电极制成的EDLC进行了比较。当用凝胶化的无碳纳米管粘合剂电极代替原始的多壁碳纳米管时，比电容得到了改善（从19.6 F g〜（-1）提高到51.3 F g〜（-1））。尽管具有凝胶化MWCNT电极的EDLC的速率性能降低，但该设备的脉冲功率足够高（〜10.5 kW kg〜（-1））。胶状电极的能量和功率密度分别从2.8 Wh公斤〜（-1）和2.0到4.7 kW kg〜（-1）改善。研究表明，用离子液体在MWCNTs中形成凝胶是获得高性能EDLC的绝妙途径。

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