Highly orientated porous Ti3C2Tx aerogel fibers for all-solid-state fiber supercapacitors with ultralight and high gravimetric capacitance

In the present work, a new strategy to prepare Ti 3 C 2 T x aerogel fiber with ultralight, highly orientated and excellent gravimetric capacitance is proposed, it consists of wet spinning of self-assembling liquid crystal phase Ti 3 C 2 T x ink with waterborne polyurethane (WPU) as a functional additive in chitosan coagulated bath and followed by bidirectional freeze-drying process with Cu bridge as thermal conductive substrate, and Ti 3 C 2 T x /WPU (T/W) aerogel fiber with ultralight, highly orientated, good tensile strength, excellent gravimetric capacitance and rate performance is prepared. T/W-1 aerogel fiber electrode exhibits a low density of 0.15 g cm −3 , excellent gravimetric capacitance of 402 F g −1 at 1 A g −1 and an outstanding rate performance of 82 % at 10 A g −1 . All-solid-state Ti 3 C 2 T x aerogel fiber supercapacitor (T/W-1 aerogel FSC) with ultralight, good flexibility and high gravimetric capacitance is assembled, it not only shows a gravimetric capacitance of 124 F g −1 and an energy density of 6.2 Wh Kg −1 at a power density of 150.0 W kg −1 , but also displays a capacity retention of 97 % after 100 bending times at 180°. The impressing ultralight, good flexibility and high gravimetric capacitance make T/W-1 aerogel FSC a promising flexible power source in the fields of portable and wearable electronic devices.