Interdigitated supercapacitor with double-layer active material prepared by sacrificial layer method

• Published in: Journal of power sources Vol. 603; p. 234476
• Main Authors: Xu, Jianxin, Sun, Wenxuan, Liu, Ming, Jia, Yonggang, Li, Yang, Liu, Huan, Wang, Junyao, Pan, Hongxu, Quan, Jingran, Liu, Yahao, Chen, Yansong, Yang, Hanbo, Gao, Guangze
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 30.05.2024
• Subjects: Bilayer active material; Capacity enhancement; Interdigital electrode; Sacrificial layer method; Silk-screen printing; Supercapacitor; Supercapacitor; Silk-screen printing; Interdigital electrode; Capacity enhancement; Bilayer active material; Sacrificial layer method
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2024.234476

Increasing the surface area of active materials is a crucial approach to enhance the capacity of supercapacitors. In this study, we present an interdigitated supercapacitor featuring a double-layer active material prepared using a sacrificial layer method. The replacement of the insulating substrate with a gel electrolyte facilitates ion motion between the active electrodes. Finite element analysis (FEA) and electrochemical experiments confirm that the utilization of double-layer active material can significantly improve the capacity (1.5–1.85 times higher than traditional structures). The electrochemical performance of the three active materials has been significantly improved after using the double-layer active material structure, which proves that the method in this paper has strong material compatibility. Furthermore, an interdigital supercapacitor (ISC) is fabricated using electrodes with double-layer active material through the sacrificial layer method and its electrochemical performance is evaluated. At a scan rate of 10 mV·s-1, ISC exhibits an impressive area-specific capacitance as high as 68.4 mF·cm-2. Remarkably, ISC can maintain stable power output even under extreme deformation and fatigue testing conditions. This strategy involving interdigitated supercapacitors with double-layer active materials prepared via the sacrificial layer method presents a promising solution for flexible energy storage devices. •Use sacrificial layer method to remove the substrate.•A double-layer active material structure with increased capacity is proposed.•Replace the insulating substrate with a gel electrolyte.