title: An Asymmetric Supercapacitor with Both Ultra-High Gravimetric and Volumetric Energy Density Based on 3D Ni(OH)2/MnO2@Carbon Nanotube and Activated Polyaniline-Derived Carbon.
abstract: Development of a supercapacitor device with both high gravimetric and volumetric energy density is one of the most important requirements for their practical application in energy storage/conversion systems. Currently, improvement of the gravimetric/volumetric energy density of a supercapacitor is restricted by the insufficient utilization of positive materials at high loading density and the inferior capacitive behavior of negative electrodes. To solve these problems, we elaborately designed and prepared a 3D core-shell structured Ni(OH)2/MnO2@carbon nanotube (CNT) composite via a facile solvothermal process by using the thermal chemical vapor deposition grown-CNTs as support. Owing to the superiorities of core-shell architecture in improving the service efficiency of pseudocapacitive materials at high loading density, the prepared Ni(OH)2/MnO2@CNT electrode demonstrated a high capacitance value of 2648 F g-1(1 A g-1) at a high loading density of 6.52 mg cm-2. Coupled with high-performance activated polyaniline-derived carbon (APDC, 400 F g-1at 1 A g-1), the assembled Ni(OH)2/MnO2@CNT//APDC asymmetric device delivered both high gravimetric and volumetric energy density (126.4 Wh kg-1and 10.9 mWh cm-3, respectively), together with superb rate performance and cycling lifetime. Moreover, we demonstrate an effective approach for building a high-performance supercapacitor with high gravimetric/volumetric energy density.
authors.affiliation: State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Lanzhou University of Technology , Lanzhou 730050, P. R. China.|Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou 730000, P. R. China.|University of Chinese Academy of Science , Beijing 100080, P. R. China.
authors.forename: Juanjuan
authors.initials: J
authors.lastname: Shen
authors.affiliation: State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Lanzhou University of Technology , Lanzhou 730050, P. R. China.|Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou 730000, P. R. China.
authors.forename: Xiaocheng
authors.identifier: http://orcid.org/0000-0002-1583-9664
authors.initials: X
authors.lastname: Li
authors.affiliation: Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou 730000, P. R. China.
authors.forename: Liu
authors.initials: L
authors.lastname: Wan
authors.affiliation: School of Electrical & Electronic Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798.
authors.forename: Kun
authors.initials: K
authors.lastname: Liang
authors.affiliation: School of Electrical & Electronic Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798.
authors.forename: Beng Kang
authors.initials: BK
authors.lastname: Tay
authors.affiliation: State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Lanzhou University of Technology , Lanzhou 730050, P. R. China.
authors.forename: Lingbin
authors.initials: L
authors.lastname: Kong
authors.affiliation: Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou 730000, P. R. China.
authors.forename: Xingbin
authors.identifier: http://orcid.org/0000-0002-9976-8815
authors.initials: X
authors.lastname: Yan
keywords: activated polyaniline-derived carbon; asymmetric supercapacitor; energy density; high mass loading; nickel hydroxide/manganese dioxide composite