Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 46, Pages 18164-18173Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta08233e
Keywords
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Funding
- National Natural Science Foundation of China [61301036, 51402340]
- Youth Innovation Promotion Association CAS [2014226]
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To meet the demands of high energy storage and low productive cost as well as the ability to be incorporated into wearable electronics, we developed a flexible and weavable asymmetric fiber-shaped solid-state supercapacitor (a-FSSC) based on carbon fiber bundle@CNT-NiCo(OH)(x) (CF@CNC) and carbon fiber bundle@activated carbon (CF@AC) electrodes with increased operating voltage (1.4-1.6 V) and capacitance. For the positive electrode of CF@CNC, great electrochemical performance enhancement brought about by surface modifications with air plasma and carbon nanotube (CNT) coating is demonstrated. For the negative electrode of CF@AC, a facile and effective way of incorporating activated carbon into carbon fiber bundles is developed. The resultant assembled a-FSSC showed an areal energy and power density of 33.0 mu W h cm(-2) and 0.75 mW cm(-2) at 1.6 V, which are better than those of most of the present fiber-shaped supercapacitors. The volumetric energy and power density of 0.84 mW h cm(-3) and 19.1 mW cm(-3) are also comparable to the reported results. Its long cycle life (100% capacitance retention after 8000 charge-discharge cycles) reveals its high electrochemical stability. High capacitance retention in the repeated bending (20% decay after 1000 bending times) and torsion (107% retention after 1000 twisting times) tests demonstrated the great flexibility, structural stability and potential utilization of the a-FSSC in wearable electronics. As a demonstration, a woolen fabric woven with three a-FSSCs connected in series can light a blue LED and be worn on the arm.
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