Ultra-light Hierarchical Graphene Electrode for Binder-Free Supercapacitors and Lithium-Ion Battery Anodes
- Authors
- Zuo, Z.; Kim, T.Y.; Kholmanov, I.; Li, H.; Chou, H.; Li, Y.
- Issue Date
- Oct-2015
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- 3D electrodes, electrodes; graphene; lithium-ion batteries; porous electrodes; supercapacitors
- Citation
- SMALL, v.11, no.37, pp.4922 - 4930
- Journal Title
- SMALL
- Volume
- 11
- Number
- 37
- Start Page
- 4922
- End Page
- 4930
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/11054
- DOI
- 10.1002/smll.201501434
- ISSN
- 1613-6810
- 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 m2 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). An ultra-light hierarchical graphene electrode is prepared via a new and environmental-friendly activation method. It has a specific surface area up to 835 m2 g-1 and a powder conductivity of 400 S m-1. As binder-free electrode, it delivers a robust and high specific capacitance in supercapacitors and a capacity in lithium-ion anodes with a very high charge/discharge rate. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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