Ultrafast charge and discharge biscrolled yarnsupercapacitors for textiles and microdevices

摘要

Flexible, wearable, implantable and easily reconfigurable supercapacitors delivering highenergy and power densities are needed for electronic devices. Here we demonstrateweavable, sewable, knottable and braidable yarns that function as high performanceelectrodes of redox supercapacitors. A novel technology, gradient biscrolling, provides fastion-transport yarn in which hundreds of layers of conducting-polymer-infiltrated carbonnanotube sheet are scrolled into B20 mm diameter yarn. Plying the biscrolled yarnwith a metal wire current collector increases power generation capabilities. The volumetriccapacitance is high (up to B179 F cm~(-3)) and the discharge current of the plied yarnsupercapacitor linearly increases with voltage scan rate up to B80 Vs~(-1) and B20Vs~(-1) forliquid and solid electrolytes, respectively. The exceptionally high energy and power densitiesfor the complete supercapacitor, and high cycle life that little depends on winding orsewing (92%, 99% after 10,000 cycles, respectively) are important for the applications inelectronic textiles.