High capacity Li ion battery anodes using Ge nanowires

被引:820
作者
Chan, Candace K. [1 ]
Zhang, Xiao Feng [2 ]
Cui, Yi [3 ]
机构
[1] Stanford Univ, Dept Chem, Stanford, CA 94305 USA
[2] Hitachi High Technol, Elect Microscope Div, Pleasanton, CA 94588 USA
[3] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA
关键词
D O I
10.1021/nl0727157
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Ge nanowire electrodes fabricated by using vapor-liquid-solid growth on metallic current collector substrates were found to have good performance during cycling with Li. An initial discharge capacity of 1141 mA-h/g was found to be stable over 20 cycles at the C/20 rate. High power rates were also observed up to 2C with Coulombic efficiency > 99%. Structural characterization revealed that the Ge nanowires remain intact and connected to the current collector after cycling. Nanowires connected directly to the current collector have facile strain relaxation and material durability, short Li diffusion distances, and good electronic conduction. Thus, Ge nanowire anodes are promising candidates for the development of high-energy-density lithium batteries.
引用
收藏
页码:307 / 309
页数:3
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