Flexible Holey Graphene Paper Electrodes with Enhanced Rate Capability for Energy Storage Applications

The unique combination of high surface area, high electrical conductivity and robust mechanical integrity has attracted great interest in the use of graphene sheets for future electronics applications. Their potential applications for high-power energy storage devices, however, are restricted by the...

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Bibliographic Details
Published in:ACS nano 2011-11, Vol.5 (11), p.8739-8749
Main Authors: Zhao, Xin, Hayner, Cary M, Kung, Mayfair C, Kung, Harold H
Format: Article
Language:English
Subjects:
Cavitation
Devices
Electric Conductivity
Electric Power Supplies
Electrochemistry
Electrodes
Electron Transport
Electronics
Energy storage
Graphene
Graphite - chemistry
Ionic mobility
Nanostructure
Oxides - chemistry
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Summary:The unique combination of high surface area, high electrical conductivity and robust mechanical integrity has attracted great interest in the use of graphene sheets for future electronics applications. Their potential applications for high-power energy storage devices, however, are restricted by the accessible volume, which may be only a fraction of the physical volume, a consequence of the compact geometry of the stack and the ion mobility. Here we demonstrated that remarkably enhanced power delivery can be realized in graphene papers for the use in Li-ion batteries by controlled generation of in-plane porosity via a mechanical cavitation-chemical oxidation approach. These flexible, holey graphene papers, created via facile microscopic engineering, possess abundant ion binding sites, enhanced ion diffusion kinetics, and excellent high-rate lithium-ion storage capabilities, and are suitable for high-performance energy storage devices.
ISSN:1936-0851
1936-086X
DOI:10.1021/nn202710s