All-solid-state Ti 3 C 2 T x neutral symmetric fiber supercapacitors with high energy density and wide temperature range

• Published in: Journal of colloid and interface science Vol. 643; p. 92
• Main Authors: Ma, Fuquan, Li, Ling, Jia, Congying, He, Xuexia, Li, Qi, Sun, Jie, Jiang, Ruibin, Lei, Zhibin, Liu, Zong-Huai
• Format: Journal Article
• Language: English
• Published: United States 01.08.2023
• Subjects: Neutral electrolyte; All-solid-state fiber supercapacitor; High energy density; Wide temperature range; TiCT(x) fiber

All-solid-state Ti C T neutral symmetric fiber supercapacitors (PVA EGHG Ti C T FSCs) with high energy density and wide temperature range are constructed by using polyvinyl alcohol (PVA)-ethylene glycol hydrogel (EGHG)-sodium perchlorate (NaClO ) as electrolyte and separator, and Ti C T fiber as electrodes. Ti C T fiber is prepared using 130 mg mL Ti C T nanosheet ink as an assembly unit in a coagulation bath of isopropyl alcohol (IPA) and distilled water with 5 wt% CaCl by a wet spinning method. The prepared Ti C T fiber exhibits a specific capacity of 385 F cm and a capacitance retention of 94 % after 10,000 cycles in 1 M NaClO electrolyte. The assembled PVA EGHG Ti C T FSCs deliver a specific capacitance of 41 F cm , a volumetric energy density of 5 mWh cm , and a capacitance retention of 92 % after 500 times continuous bending. Furthermore, it shows good flexibility and excellent capacitance over a wide temperature range of -40 to 40 °C and maintains its electrochemical performance under varying degrees of bending. This study provides a viable strategy for designing and assembling all-solid-state neutral symmetric fiber supercapacitors with high energy density and wide temperature range.