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Nano Lett. 2009 Sep;9(9):3370-4. doi: 10.1021/nl901670t.

Carbon-silicon core-shell nanowires as high capacity electrode for lithium ion batteries.

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  • 1Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA.

Abstract

We introduce a novel design of carbon-silicon core-shell nanowires for high power and long life lithium battery electrodes. Amorphous silicon was coated onto carbon nanofibers to form a core-shell structure and the resulted core-shell nanowires showed great performance as anode material. Since carbon has a much smaller capacity compared to silicon, the carbon core experiences less structural stress or damage during lithium cycling and can function as a mechanical support and an efficient electron conducting pathway. These nanowires have a high charge storage capacity of approximately 2000 mAh/g and good cycling life. They also have a high Coulmbic efficiency of 90% for the first cycle and 98-99.6% for the following cycles. A full cell composed of LiCoO(2) cathode and carbon-silicon core-shell nanowire anode is also demonstrated. Significantly, using these core-shell nanowires we have obtained high mass loading and an area capacity of approximately 4 mAh/cm(2), which is comparable to commercial battery values.

PMID:
19655765
DOI:
10.1021/nl901670t
[PubMed - indexed for MEDLINE]
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