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nl-2018-01988b_0006

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

 Bernal Institute and Department of Chemical SciencesUniversity of Limerick, Limerick, V94 T9PX Ireland
Nano Lett.201818 (9), pp 5569–5575
DOI: 10.1021/acs.nanolett.8b01988
Publication Date (Web): August 6, 2018
Copyright © 2018 American Chemical Society

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.

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