High-Performance Coaxial Asymmetry Fibrous Supercapacitors with a Poly(vinyl alcohol)–Montmorillonite Separator

• DOI: 10.1021/acs.nanolett.1c02998
• Publication Date: 2021-10-26T17:29:04Z
• Authors: Wen He; Xiang Fu; Peijia Bai; Ding Zhang; Heng Cui; Rujun Ma
• Keywords: Coaxial; Separator (oil production); Power density

Fibrous supercapacitors have garnered great interest from researchers because of their large electrode/electrolyte interface area, short ion transport path, and high flexibility. However, obtaining a thin gel electrolyte interlayer with rate uniform thickness is still challenging. Here, we proposed an efficient wet-spinning technique to fabricate polyvinyl-montmorillonite tubular layers for the preparation high-performance coaxial asymmetry fibrous supercapacitor (AFSC). The AFSC shows ultrahigh energy densities in range 2.86-4.04 μW h cm-2 at power 0.16-1.61 mW while maintaining long cycling life (94% retention even after 20 000 cycles). After charging constant voltage 2.4 V 30 s, flexible watchband which composed three series-connected AFSCs could commercial electronic watch more than 2 min. This work provides universal strategy wearable storage devices.