Journal
NANO LETTERS
Volume 18, Issue 9, Pages 5569-5575Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b01988
Keywords
Si-Ge; heterostructure; nanowires; restructuring; lithium-ion battery
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Funding
- Science Foundation Ireland (SFI) [16/IA/4629, 11-PI-1148]
- Irish Research Council through the Government of Ireland Postgraduate Scheme
- Intel Ireland
- Irish Research Council through the Enterprise Partnership Scheme
- Enterprise Ireland [CF20144014]
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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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