Axial Si--Ge Heterostructure Nanowires as Lithium-Ion Battery Anodes

Hugh Geaney, Killian Stokes, Grace Flynn, Gerard Bree, Kevin M. Ryan

Research output: Contribution to journalArticlepeer-review

Abstract

Here, we report the application of axially heterostructured nanowires consisting of alternating segments of silicon and germanium with a tin seed as lithium-ion battery anodes. During repeated lithiation and delithiation, the heterostructures completely rearrange into a porous network of homogeneously alloyed Si1-xGex ligaments. The transformation was characterized through ex situ TEM, STEM, and Raman spectroscopy. Electrochemical analysis was conducted on the heterostructure nanowires with discharge capacities in excess of 1180 mAh/g for 400 cycles (C/5) and capacities of up to 613 mAh/g exhibited at a rate of 10 C.

Original languageEnglish (Ireland)
Pages (from-to)5569-5575
Number of pages7
JournalNano Letters
Volume18
Issue number9
DOIs
Publication statusPublished - 12 Sep 2018

Keywords

  • heterostructure
  • lithium-ion battery
  • nanowires
  • restructuring
  • Si-Ge

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