title: Ultra-light Hierarchical Graphene Electrode for Binder-Free Supercapacitors and Lithium-Ion Battery Anodes.
abstract: A mild and environmental-friendly method is developed for fabricating a 3D interconnected graphene electrode with large-scale continuity. Such material has interlayer pores between reduced graphene oxide nanosheets and in-plane pores. Hence, a specific surface area up to 835 m(2) g(-1) and a high powder conductivity up to 400 S m(-1) are achieved. For electrochemical applications, the interlayer pores can serve as "ion-buffering reservoirs" while in-plane ones act as "channels" for shortening the mass cross-plane diffusion length, reducing the ion response time, and prevent the interlayer restacking. As binder-free supercapacitor electrode, it delivers a specific capacitance up to 169 F g(-1) with surface-normalized capacitance close to 21 μF cm(-2) (intrinsic capacitance) and power density up to 7.5 kW kg(-1), in 6 m KOH aqueous electrolyte. In the case of lithium-ion battery anode, it shows remarkable advantages in terms of the initiate reversible Coulombic efficiency (61.3%), high specific capacity (932 mAh g(-1) at 100 mA g(-1)), and robust long-term retention (93.5% after 600 cycles at 2000 mAh g(-1)).
authors.affiliation: CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Science, Beijing, 100190, P. R. China.
authors.forename: Zicheng
authors.initials: Z
authors.lastname: Zuo
authors.affiliation: Department of Mechanical Engineering and Materials Science and Engineering Program, The University of Texas at Austin, One University Station C2200, Austin, TX, 78712, USA.
authors.forename: Tae Young
authors.initials: TY
authors.lastname: Kim
authors.affiliation: Department of Mechanical Engineering and Materials Science and Engineering Program, The University of Texas at Austin, One University Station C2200, Austin, TX, 78712, USA.
authors.forename: Iskandar
authors.initials: I
authors.lastname: Kholmanov
authors.affiliation: Department of Mechanical Engineering and Materials Science and Engineering Program, The University of Texas at Austin, One University Station C2200, Austin, TX, 78712, USA.
authors.forename: Huifeng
authors.initials: H
authors.lastname: Li
authors.affiliation: Department of Mechanical Engineering and Materials Science and Engineering Program, The University of Texas at Austin, One University Station C2200, Austin, TX, 78712, USA.
authors.forename: Harry
authors.initials: H
authors.lastname: Chou
authors.affiliation: CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Science, Beijing, 100190, P. R. China.
authors.forename: Yuliang
authors.initials: Y
authors.lastname: Li
keywords: 3D electrodes, electrodes; graphene; lithium-ion batteries; porous electrodes; supercapacitors