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Cho, Jaephil
Nano Energy Storage Materials Lab (NESM)
Research Interests
  • Li-ion battery, metal-air battery, redox-flow battery, flexible battery .

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Sn78Ge22@carbon core-shell nanowires as fast and high-capacity lithium storage media

Cited 69 times inthomson ciCited 72 times inthomson ci
Title
Sn78Ge22@carbon core-shell nanowires as fast and high-capacity lithium storage media
Author
Lee, HyojinCho, Jaephil
Keywords
Charge distribution; Cluster analysis; Coulomb blockade; Lithium batteries; Rapid thermal annealing; Tin alloys
Issue Date
200709
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.7, no.9, pp.2638 - 2641
Abstract
Branched Sn78Ge22@carbon core-shell nanowires were prepared by thermal annealing of butyl-capped Sn78Ge22 clusters at 600°C in a vacuum. The first discharge and charge capacities are 1250 and 1107 mA h/g, showing a Coulombic efficiency of 88%. Such a one-dimensional core-shell design exploits the benefits of the Sn 78Ge22 nanowire to produce an exceptional high rate lithium reactivity (93% Coulombic efficiency at 8C (=6400 mA/g) rate) as well as excellent capacity retention after extended cycles (capacity retention of 94%).
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DOI
http://dx.doi.org/10.1021/nl071022n
ISSN
1530-6984
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