title: Stretchable Wire-Shaped Asymmetric Supercapacitors Based on Pristine and MnO2 Coated Carbon Nanotube Fibers.
abstract: While the emerging wire-shaped supercapacitors (WSS) have been demonstrated as promising energy storage devices to be implemented in smart textiles, challenges in achieving the combination of both high mechanical stretchability and excellent electrochemical performance still exist. Here, an asymmetric configuration is applied to the WSS, extending the potential window from 0.8 to 1.5 V, achieving tripled energy density and doubled power density compared to its asymmetric counterpart while accomplishing stretchability of up to 100% through the prestrainning-then-buckling approach. The stretchable asymmetric WSS constituted of MnO2/CNT hybrid fiber positive electrode, aerogel CNT fiber negative electrode and KOH-PVA electrolyte possesses a high specific capacitance of around 157.53 μF cm(-1) at 50 mV s(-1) and a high energy density varying from 17.26 to 46.59 nWh cm(-1) with the corresponding power density changing from 7.63 to 61.55 μW cm(-1). Remarkably, a cyclic tensile strain of up to 100% exerts negligible effects on the electrochemical performance of the stretchable asymmetric WSS. Moreover, after 10,000 galvanostatic charge-discharge cycles, the specific capacitance retains over 99%, demonstrating a long cyclic stability.
authors.affiliation: †College of Textiles, Donghua University, Shanghai, 201620, P. R. China.|‡Department of Mechanical Engineering, University of Delaware, Newark, Delaware 19716, United States.
authors.forename: Ping
authors.initials: P
authors.lastname: Xu
authors.affiliation: ‡Department of Mechanical Engineering, University of Delaware, Newark, Delaware 19716, United States.
authors.forename: Bingqing
authors.initials: B
authors.lastname: Wei
authors.affiliation: ‡Department of Mechanical Engineering, University of Delaware, Newark, Delaware 19716, United States.
authors.forename: Zeyuan
authors.initials: Z
authors.lastname: Cao
authors.affiliation: §Department of Chemical and Biomolecular Engineering, Center for Catalytic Science and Technology, University of Delaware, Newark, Delaware 19716, United States.
authors.forename: Jie
authors.initials: J
authors.lastname: Zheng
authors.affiliation: §Department of Chemical and Biomolecular Engineering, Center for Catalytic Science and Technology, University of Delaware, Newark, Delaware 19716, United States.
authors.forename: Ke
authors.initials: K
authors.lastname: Gong
authors.affiliation: †College of Textiles, Donghua University, Shanghai, 201620, P. R. China.
authors.forename: Faxue
authors.initials: F
authors.lastname: Li
authors.affiliation: †College of Textiles, Donghua University, Shanghai, 201620, P. R. China.
authors.forename: Jianyong
authors.initials: J
authors.lastname: Yu
authors.affiliation: ∥Suzhou Institute of Nano-Tech and Nano-Bionics, Suzhou 215123, P. R. China.
authors.forename: Qingwen
authors.initials: Q
authors.lastname: Li
authors.affiliation: ∥Suzhou Institute of Nano-Tech and Nano-Bionics, Suzhou 215123, P. R. China.
authors.forename: Weibang
authors.initials: W
authors.lastname: Lu
authors.affiliation: ⊥Composites Research Center, Korean Institute of Materials Science, Changwon, 641831, South Korea.
authors.forename: Joon-Hyung
authors.initials: JH
authors.lastname: Byun
authors.affiliation: ⊥Composites Research Center, Korean Institute of Materials Science, Changwon, 641831, South Korea.
authors.forename: Byung-Sun
authors.initials: BS
authors.lastname: Kim
authors.affiliation: §Department of Chemical and Biomolecular Engineering, Center for Catalytic Science and Technology, University of Delaware, Newark, Delaware 19716, United States.
authors.forename: Yushan
authors.initials: Y
authors.lastname: Yan
authors.affiliation: ‡Department of Mechanical Engineering, University of Delaware, Newark, Delaware 19716, United States.
authors.forename: Tsu-Wei
authors.initials: TW
authors.lastname: Chou
keywords: asymmetric configuration; carbon nanotube fibers; manganese oxides; stretchability; wire-shaped supercapacitors