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Axial Si-Ge Heterostructure Nanowires as Lithium-Ion Battery Anodes
Killian Stokes1, Grace Flynn1, Hugh Geaney1
1Bernal Institute and Department of Chemical Sciences , University of Limerick , Limerick , V94 T9PX Ireland.
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- xGe x 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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