超高面积性能柔性石墨烯/碳纳米管电化学双层电容器
Flexible Graphene/Carbon Nanotube Electrochemical Double-Layer Capacitors with Ultrahigh Areal Performance
摘要：
具有高面积电容的电化学双层电容器（EDLC）的制造依赖于使用高质量负载的高度多孔活性材料。在此，我们展示了石墨烯/纳米管混合EDLC的高通量制造。采用湿法喷射研磨（WJM）方法将石墨剥离成工业规模的单层/少层石墨烯薄片（WJM-G）（生产率约0.5kg/天）。将商业单/双壁碳纳米管（SDWCNT）与石墨烯薄片混合，以便在它们的膜形成期间充当石墨烯薄片之间的间隔物。后者通过一步真空过滤获得，从而产生自立式、无金属和无粘合剂的柔性EDLC电极，具有高达30 mg cm-2的高活性材料质量负载。相应的对称WJM-G/SDWCNT EDLC在1.3 mW cm-2下表现出539 uWh cm-2的电极能量密度和高达532 mW cm-2的工作功率密度（优于大多数EDLC技术）。即使在高度折叠状态（高达180度）下，EDCL也表现出出色的循环稳定性和出色的灵活性。活性材料的工业化生产、EDLC电极的简化制造以及所生产的EDLC的电介质面积性能的组合对于新颖的先进EDLC设计是有希望的。
英文摘要：
The fabrication of electrochemical double-layer capacitors (EDLCs) with high areal capacitance relies on the use of elevated mass loadings of highly porous active materials. Herein, we demonstrate a high-throughput manufacturing of graphene/nanotubes hybrid EDLCs. Wet-jet milling (WJM) method is exploited to exfoliate the graphite into single/few-layer graphene flakes (WJM-G) in industrial volume (production rate ~0.5 kg/day). Commercial single/double walled carbon nanotubes (SDWCNTs) are mixed with graphene flakes in order to act as spacers between the graphene flakes during their film formation. The latter is obtained by one-step vacuum filtration, resulting in self-standing, metal- and binder-free flexible EDLC electrodes with high active material mass loadings up to 30 mg cm-2. The corresponding symmetric WJM-G/SDWCNTs EDLCs exhibit electrode energy densities of 539 uWh cm-2 at 1.3 mW cm-2 and operating power densities up to 532 mW cm-2 (outperforming most of the EDLC technologies). The EDCLs show excellent cycling stability and outstanding flexibility even under highly folded states (up to 180 degrees). The combination of industrial-like production of active materials, simplified manufacturing of EDLC electrodes, and ultrahigh areal performance of the as-produced EDLCs are promising for novel advanced EDLC designs.
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