Effect of Sheet Morphology on the Scalability of Graphene-Based Ultracapacitors
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- 27 January 2013
- journal article
- Published by American Chemical Society (ACS) in ACS Nano
- Vol. 7 (2), 1464-1471
- https://doi.org/10.1021/nn3052378
Abstract
Graphene is considered a promising ultracapacitor material toward high power and energy density because of its high conductivity and high surface area without pore tortuosity. However, the two-dimensional (2D) sheets tend to aggregate during the electrode fabrication process and align perpendicular to the flow direction of electrons and ions, which can reduce the available surface area and limit the electron and ion transport. This makes it hard to achieve scalable device performance as the loading level of the active material increases. Here, we report a strategy to solve these problems by transforming the 2D graphene sheet into a crumpled paper ball structure. Compared to flat or wrinkled sheets, the crumpled graphene balls can deliver much higher specific capacitance and better rate performance. More importantly, devices made with crumpled graphene balls are significantly less dependent on the electrode mass loading. Performance of graphene-based ultracapacitors can be further enhanced by using flat graphene sheets as the binder for the crumpled graphene balls, thus eliminating the need for less active binder materials.Keywords
This publication has 38 references indexed in Scilit:
- Laser Scribing of High-Performance and Flexible Graphene-Based Electrochemical CapacitorsScience, 2012
- Carbon-Based Supercapacitors Produced by Activation of GrapheneScience, 2011
- Bioinspired Effective Prevention of Restacking in Multilayered Graphene Films: Towards the Next Generation of High‐Performance SupercapacitorsAdvanced Materials, 2011
- Graphene-Based Supercapacitor with an Ultrahigh Energy DensityNano Letters, 2010
- Graphene Double-Layer Capacitor with ac Line-Filtering PerformanceScience, 2010
- Graphene Oxide, Highly Reduced Graphene Oxide, and Graphene: Versatile Building Blocks for Carbon‐Based MaterialsSmall, 2010
- Chemical methods for the production of graphenesNature Nanotechnology, 2009
- Graphene-Based UltracapacitorsNano Letters, 2008
- Graphene-Based MaterialsScience, 2008
- Graphene-based electrochemical supercapacitorsJournal of Chemical Sciences, 2008