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Kim, Byeong-Su
Soft and Hybrid Nanomaterials Lab
Research Interests
  • Carbon materials, polymer, Layer-by-Layer (LbL) assembly, hyperbranched polymer, polyglycerol (PG), bio-applications

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High-power lithium batteries from functionalized carbon-nanotube electrodes

Cited 321 times inthomson ciCited 292 times inthomson ci
Title
High-power lithium batteries from functionalized carbon-nanotube electrodes
Author
Lee, Seung WooYabuuchi, NaoakiGallant, Betar M.Chen, ShuoKim, Byeong-SuHammond, Paula T.Shao-Horn, Yang
Keywords
ELECTROCHEMICAL CAPACITORS; ION BATTERIES; ENERGY-STORAGE; NANOSTRUCTURED MATERIALS; NANOSCALE MNO2; PERFORMANCE; DEPOSITION; POLYMERS; NITROGEN; DEVICES
Issue Date
2010-07
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE NANOTECHNOLOGY, v.5, no.7, pp.531 - 537
Abstract
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 200mAhg 1 electrode while also delivering 100kWkg electrode 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.
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DOI
10.1038/NNANO.2010.116
ISSN
1748-3387
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PHY_Journal Papers
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