Wide Temperature All-Solid-State Ti C T Quantum Dots/L-Ti C T Fiber Supercapacitor with High Capacitance and Excellent Flexibility

Ti C T Quantum dots (QDs)/L-Ti C T fiber electrode (Q M ) with high capacitance and excellent flexibility is prepared by a wet spinning method. The assembled units Ti C T nanosheets (NSs) with large size (denoted as L-Ti C T ) is obtained by natural sedimentation screen raw Ti AlC , etching, and mechanical delamination. The pillar agent Ti C T QDs is fabricated by an ultrasound method. Q M fiber electrode gave a specific capacitance of 1560 F cm , with a capacity retention rate of 79% at 20 A cm , and excellent mechanical strength of 130 Mpa. A wide temperature all-solid-state the delaminated montmorillonite (F-MMT)/Polyvinyl alcohol (PVA) dimethyl sulfoxide (DMSO) flexible hydrogel (DHGE) (F-MMT/PVA DHGE) Q M fiber supercapacitor is assembled by using Q M fiber as electrodes and F-MMT/PVA DHGE as electrolyte and separator. It showed a volume specific capacitance of 413 F cm at 0.5 A cm , a capacity retention of 97% after 10 000 cycles, an energy density of 36.7 mWh cm at a power density of 311 mW cm , and impressive capacitance and flexibility over a wide temperature range of -40 to 60 °C. This work provides an effective strategy for designing and assembling wide temperature all-solid-state fiber supercapacitors with optimal balance of capacitive performance and flexibility.