Sn78Ge22@carbon core-shell nanowires as fast and high-capacity lithium storage media
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- Sn78Ge22@carbon core-shell nanowires as fast and high-capacity lithium storage media
- Lee, Hyojin; Cho, Jaephil
- Charge distribution; Cluster analysis; Coulomb blockade; Lithium batteries; Rapid thermal annealing; Tin alloys
- Issue Date
- AMER CHEMICAL SOC
- NANO LETTERS, v.7, no.9, pp.2638 - 2641
- 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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