论文标题
柔性石墨烯/碳纳米管电化学双层电容器具有超高面积性能
Flexible Graphene/Carbon Nanotube Electrochemical Double-Layer Capacitors with Ultrahigh Areal Performance
论文作者
论文摘要
具有高面积电容的电化学双层电容器（EDLC）的制造取决于使用高度多孔活性材料的质量载荷。本文中，我们展示了石墨烯/纳米管混合EDLC的高通量制造。利用湿喷工铣削（WJM）方法将石墨剥落成工业量的单层石墨烯片（WJM-G）（生产率〜0.5 kg/day）。商业单/双壁碳纳米管（SDWCNT）与石墨烯薄片混合，以充当石墨烯薄膜形成过程中的垫片。后者是通过一步真空过滤获得的，从而产生了自动，金属和无活性的EDLC电极，其高活性材料质量负载高达30 mg cm-cm-cm-c。相应的对称WJM-G/SDWCNT EDLC在1.3 mW cm-2时表现出539 UWH CM-2的电极能密度，并且运行功率密度高达532 MW CM-2（表现优于大多数EDLC技术）。即使在高度折叠的状态（最高180度）下，EDCL也表现出极好的循环稳定性和出色的灵活性。活性材料的工业样生产，简化的EDLC电极的制造以及ASSREAR生产的EDLC的超高性能对于新型的高级EDLC设计有希望。
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.
