High-Performance Coaxial Asymmetry Fibrous Supercapacitors with a Poly(vinyl alcohol)-Montmorillonite Separator.
basic_science · Level V
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- Record sourced from PubMed, PMID 34699240.
- Also identified by DOI 10.1021/acs.nanolett.1c02998.
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Abstract
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 a high ion transport rate and uniform thickness is still challenging. Here, we proposed an efficient wet-spinning technique to fabricate uniform polyvinyl-montmorillonite tubular layers for the preparation of a high-performance coaxial asymmetry fibrous supercapacitor (AFSC). The coaxial AFSC shows ultrahigh energy densities in the range of 2.86-4.04 μW h cm<sup>-2</sup> at power densities of 0.16-1.61 mW cm<sup>-2</sup> while maintaining a long cycling life (94% retention even after 20 000 cycles). After charging at a constant voltage of 2.4 V for 30 s, the flexible watchband which is composed of three series-connected AFSCs could power a commercial electronic watch for more than 2 min. This work provides a universal strategy to fabricate high-performance and wearable energy storage devices.