Yarn supercapacitors have great potential in future portable and wearable electronics because of their tiny volume, flexibility and weavability. However, low-energy density limits their development in the area of wearable high-energy density devices. How to enhance their energy densities while retaining their high-power densities is a critical challenge for yarn supercapacitor development. Here we propose a coaxial wet-spinning assembly approach to continuously spin polyelectrolyte-wrapped graphene/carbon nanotube core-sheath fibres, which are used directly as safe electrodes to assembly two-ply yarn supercapacitors. The yarn supercapacitors using liquid and solid electrolytes show ultra-high capacitances of 269 and 177 mF cm−2 and energy densities of 5.91 and 3.84 μWh cm−2, respectively. A cloth supercapacitor superior to commercial capacitor is further interwoven from two individual 40-cm-long coaxial fibres. The combination of scalable coaxial wet-spinning technology and excellent performance of yarn supercapacitors paves the way to wearable and safe electronics.
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机译:纱线超级电容器的体积小,灵活性强,可编织性强,在未来的便携式和可穿戴电子产品中具有巨大的潜力。但是,低能量密度限制了它们在可穿戴高能量密度设备领域的发展。如何在保持高功率密度的同时提高其能量密度是纱线超级电容器发展的关键挑战。在这里,我们提出了一种同轴湿纺组件方法来连续纺丝聚电解质包裹的石墨烯/碳纳米管芯鞘纤维,它们直接用作组装两层纱线超级电容器的安全电极。使用液体和固体电解质的纱线超级电容器的超高电容分别为269和177 mF cm -2 sup>,能量密度分别为5.91和3.84 Wh cm -2 sup>。由两根单独的40厘米长的同轴纤维进一步交织出一种优于商用电容器的布超级电容器。可扩展的同轴湿纺技术与纱线超级电容器的出色性能相结合,为可穿戴和安全的电子产品铺平了道路。
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