Maximum Li storage in Si nanowires for the high capacity three-dimensional Li-ion battery

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Nanowires can serve as three-dimensional platforms at the nanometer scale for highly efficient chemical energy storage and conversion vehicles, such as fuel cells and secondary batteries. Here we report a coin-type Si nanowire (NW) half-cell Li-ion battery showing the Li capacity of approximately 4000 mAh/g, which nearly approaches the theoretical limit of 4200 mAh/g, with very high Coulombic efficiency of up to 98%. Concomitantly, we provide direct evidence of reversible phase transitions in the Si NW anodes at the full electrochemical cycles, varying from pure Si to Li(22)Si(5) phase, which has been known empirically inaccessible in the bulk limit.
Publisher
AMER INST PHYSICS
Issue Date
2010-02
Language
English
Article Type
Article
Keywords

RECHARGEABLE LITHIUM BATTERIES; NANOSTRUCTURED SILICON; ANODES; INSERTION

Citation

APPLIED PHYSICS LETTERS, v.96, no.5

ISSN
0003-6951
DOI
10.1063/1.3299006
URI
http://hdl.handle.net/10203/238887
Appears in Collection
MS-Journal Papers(저널논문)
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