All-solid-state Ti3C2Tx neutral symmetric fiber supercapacitors with high energy density and wide temperature range

Fuquan Ma; Ling Li; Congying Jia; Xuexia He; Qi Li; Jie Sun; Ruibin Jiang; Zhibin Lei; Zong-Huai Liu

doi:10.1016/j.jcis.2023.04.014

All-solid-state Ti₃C₂T_x neutral symmetric fiber supercapacitors with high energy density and wide temperature range

J Colloid Interface Sci. 2023 Aug:643:92-101. doi: 10.1016/j.jcis.2023.04.014. Epub 2023 Apr 7.

Authors

Fuquan Ma¹, Ling Li¹, Congying Jia¹, Xuexia He², Qi Li², Jie Sun², Ruibin Jiang¹, Zhibin Lei¹, Zong-Huai Liu³

Affiliations

¹ Key Laboratory of Applied Surface and Colloid Chemistry (Shaanxi Normal University), Ministry of Education, Xi'an 710062, PR China; Shaanxi Key Laboratory for Advanced Energy Devices, Xi'an 710119, PR China; School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710119, PR China.
² Shaanxi Key Laboratory for Advanced Energy Devices, Xi'an 710119, PR China; School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710119, PR China.
³ Key Laboratory of Applied Surface and Colloid Chemistry (Shaanxi Normal University), Ministry of Education, Xi'an 710062, PR China; Shaanxi Key Laboratory for Advanced Energy Devices, Xi'an 710119, PR China; School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710119, PR China. Electronic address: zhliu@snnu.edu.cn.

PMID: 37054547
DOI: 10.1016/j.jcis.2023.04.014

Abstract

All-solid-state Ti₃C₂T_x neutral symmetric fiber supercapacitors (PVA EGHG Ti₃C₂T_x FSCs) with high energy density and wide temperature range are constructed by using polyvinyl alcohol (PVA)-ethylene glycol hydrogel (EGHG)-sodium perchlorate (NaClO₄) as electrolyte and separator, and Ti₃C₂T_x fiber as electrodes. Ti₃C₂T_x fiber is prepared using 130 mg mL^-1 Ti₃C₂T_x nanosheet ink as an assembly unit in a coagulation bath of isopropyl alcohol (IPA) and distilled water with 5 wt% CaCl₂ by a wet spinning method. The prepared Ti₃C₂T_x fiber exhibits a specific capacity of 385 F cm^-3 and a capacitance retention of 94 % after 10,000 cycles in 1 M NaClO₄ electrolyte. The assembled PVA EGHG Ti₃C₂T_x FSCs deliver a specific capacitance of 41 F cm^-3, a volumetric energy density of 5 mWh cm^-3, 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.

Keywords: All-solid-state fiber supercapacitor; High energy density; Neutral electrolyte; Ti(3)C(2)T(x) fiber; Wide temperature range.