High capacity Li ion battery anodes using ge nanowires

Candace K Chan; Xiao Feng Zhang; Yi Cui

doi:10.1021/nl0727157

High capacity Li ion battery anodes using ge nanowires

Nano Lett. 2008 Jan;8(1):307-9. doi: 10.1021/nl0727157. Epub 2007 Dec 21.

Authors

Candace K Chan¹, Xiao Feng Zhang, Yi Cui

Affiliation

¹ Department of Chemistry, Stanford University, Stanford, California 94305, USA.

PMID: 18095738
DOI: 10.1021/nl0727157

Abstract

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.