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 language | English (Ireland) |
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Pages (from-to) | 5569-5575 |
Number of pages | 7 |
Journal | Nano Letters |
Volume | 18 |
Issue number | 9 |
DOIs | |
Publication status | Published - 12 Sep 2018 |
Keywords
- heterostructure
- lithium-ion battery
- nanowires
- restructuring
- Si-Ge