Journal
ADVANCED ENERGY MATERIALS
Volume 7, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201600976
Keywords
asymmetric configuration; carbon nanotubes; manganese oxides; polypyrrole; supercapacitors
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Funding
- National Research Foundation of Korea
- State Scholarship Fund of the China Scholarship Council
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The emerging fiber-shaped supercapacitors (FSSs) have motivated tremendous research interest in energy storage devices. However, challenges still exist in the pursuit of combination of excellent electrochemical performance and mechanical stretchability. Here, a core-sheath asymmetric FSS is first made by wrapping gel electrolyte coated carbon nanotube (CNT)@MnO2 core fiber with CNT@PPy composite film. Then a stretchable helical structure is formed by over-twisting the FSS. The resulted stretchable asymmetric FSS exhibits a specific capacitance of 60.435 mF cm(-2) at the scan rate of 10 mV s(-1) and the capacitance performance is well maintained during repeated stretching to 20% strain. Furthermore, a high energy density of 18.88Wh cm(-2) is achieved for the stretchable FSS due to its high specific capacitance and extended potential window of 1.5 V.
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