Facile Preparation of High‐Performance Stretchable Fiber‐Like Electrodes and Supercapacitors

Abstract

Abstract A facile preparation method was proposed to fabricate core‐sheath structured elastic cord/carbon nanotube (CNT)/polyaniline (PANI) composite fibers with excellent electrochemical performance and good mechanical stretchability. Specifically, we developed a “surface melting for stable attachment” strategy to combine CNT/PANI composite film tightly with elastic cord fiber. The fabricated fiber‐like elastic cord/CNT/PANI composite electrode displays a large gravimetric capacitance of 394 F g −1 (corresponds to a linear specific capacitance of 15.4 mF cm −1 ) and superior rate capability. The electrode capacitance has no obvious decrease when the electrode was stretched from original state to a large stretch ratio of 100%, and the capacitance maintains 98% after 100 stretch‐release cycles; besides, the electrode at stretching state possesses almost same cycling stability and rate capability as it at original state. These results indicate robust micro‐structure and outstanding stretchability of our fiber‐like elastic cord/CNT/PANI composite electrode. Consequently, all‐solid‐state supercapacitors assembled based on the fiber‐like electrode also exhibit impressive stretchability. Overall, the proposed facile method for producing stretchable fiber‐like electrodes/supercapacitors is believed to further boost the practical application of stretchable and wearable energy storage devices.