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

被引：113

作者：

Lee, Hyojin ^{[1
]}

Cho, Jaephil ^{[1
]}

机构：

[1] Kumoh Natl Inst Technol, Dept Appl Chem, Gumi 730701, South Korea

来源：

NANO LETTERS | 2007年 / 7卷 / 09期

关键词：

LIQUID-SOLID GROWTH; ANODE MATERIALS; TIN; NANOPARTICLES; CARBON; ELECTRODES;

D O I：

10.1021/nl071022n

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Branched Sn78Ge22@carbon core-shell nanowires were prepared by thermal annealing of butyl-capped Sn78Ge22 clusters at 600 degrees 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 coreshell design exploits the benefits of the Sn78Ge22 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%).

引用

页码：2638 / 2641

页数：4

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