Highly loaded MXene/carbon nanotube yarn electrodes for improved asymmetric supercapacitor performance

Yarn-type supercapacitors should have high energy density in small given spaces, and the one attempt among many is to comprise the electrodes asymmetrically. However, the low capacitance of conventional materials causes the widened operating voltage useless. In this study, we have utilized a novel material MXene with carbon nanotubes (CNTs) to make highly loaded MXene/CNT yam electrodes, which exhibited a remarkable areal capacitance. With MnO2/CNT biscrolled cathode and PVA/LiCI gel electrolyte, the plied asymmetric yarn supercapacitor had energy density of 100 mu Wh/cm(2). The yarn supercapacitor could operate under mechanical deformations without performance degradation.