High-power lithium batteries from functionalized carbon-nanotube electrodes

Lee, Seung Woo and Yabuuchi, Naoaki and Gallant, Betar M. and Chen, Shuo and Kim, Byeong-Su and Hammond, Paula T. and Shao-Horn, Yang. (2010) High-power lithium batteries from functionalized carbon-nanotube electrodes. Nature Nanotechnology, 5 (7). p. 531. ISSN 1748-3387

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Energy storage devices that can deliver high powers have many applications, including hybrid vehicles and renewable energy. Much research has focused on increasing the power output of lithium batteries by reducing lithium-ion diffusion distances, but outputs remain far below those of electrochemical capacitors and below the levels required for many applications. Here, we report an alternative approach based on the redox reactions of functional groups on the surfaces of carbon nanotubes. Layer-by-layer techniques are used to assemble an electrode that consists of additive-free, densely packed and functionalized multiwalled carbon nanotubes. The electrode, which is several micrometres thick, can store lithium up to a reversible gravimetric capacity of ~200 mA h g−1electrode while also delivering 100 kW kgelectrode−1 of power and providing lifetimes in excess of thousands of cycles, both of which are comparable to electrochemical capacitor electrodes. A device using the nanotube electrode as the positive electrode and lithium titanium oxide as a negative electrode had a gravimetric energy ~5 times higher than conventional electrochemical capacitors and power delivery ~10 times higher than conventional lithium-ion batteries

Item Type: Article
InterNano Taxonomy: Nanoscale Objects and Nanostructured Materials
Areas of Application > Energy and Utilities
Areas of Application > Electronics and Semiconductor Industries
Collections: Nanomanufacturing Research Collection
Depositing User: Amulya Gullapalli
Date Deposited: 13 Jul 2011 01:27
Last Modified: 13 Jul 2011 01:27
URI: http://eprints.internano.org/id/eprint/623

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