Ti3C2Tx/aramid film electrode with high capacitance and good mechanical strength and the assembled wide temperature all-solid-state symmetrical supercapacitor

Using large Ti 3 C 2 T x nanosheets (L-Ti 3 C 2 T x ) and aramid nanofibers as the assembled units and functional additive, the L-Ti 3 C 2 T x nanosheets/E-ANF film electrode (T/E-A-10) with high capacitive performance of 332 F g −1 in 3 M H 2 SO 4 electrolyte and good mechanical strength of 153 MPa was prepared. Also PVA/Ti 3 C 2 T x nanosheet flexible hydrogel electrolyte with excellent antifreezing, long-lasting moisture, high ion conductivity and wide temperature working range was developed. A wide-temperature flexible all-solid-state T/E-A-10 film symmetrical supercapacitor (T/E-A-10 FSSC) was assembled by using T/E-A-10 flexible film as electrodes, and PVA/Ti 3 C 2 T x membrane as hydrogel electrolyte and separator. The assembled devices not only showed a specific capacitance of 83 F g −1 at a current density of 0.5 A g −1 , 92% of the initial capacitance after 4000 cycles, and a maximum energy density of 11.8 Wh kg −1 , but also maintained good flexibility in a wide temperature range of −40–60 °C, it showed a promising flexible power source in the field of portable/wearable electronic devices. • Ti 3 C 2 T x /E-ANF film shows a capacitance of 332 F g −1 and a stress of 153 MPa. • PVA/Ti 3 C 2 T x electrolyte with high ion conductivity can work among -40-60 °C. • A wide-temperature flexible all-solid-state device with superior property.