Journal
NANO LETTERS
Volume 21, Issue 21, Pages 9164-9171Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c02998
Keywords
coaxial; fibrous; wet-spinning; high-performance; supercapacitor
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Funding
- National Key R&D Program of China [2020YFA0711500]
- National Natural Science Foundation of China [51973095, 52011540401]
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This study presents a method for producing high-performance coaxial asymmetry fibrous supercapacitors using a wet-spinning technique to fabricate uniform polyvinyl-montmorillonite tubular layers. The capacitors exhibit high energy densities and long cycling life, being able to power a commercial electronic watch for over 2 minutes after charging for 30 seconds.
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 mu W h cm(-2) at power densities of 0.16-1.61 mW cm(-2) 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.
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