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- Title
Electrochemical Properties of Si-Ge Heterostructures as an Anode Material for Lithium Ion Batteries.
- Authors
Song, Taeseup; Cheng, Huanyu; Town, Kaitlin; Park, Hyunjung; Black, Robert W.; Lee, Sangkyu; Park, Won Il; Huang, Yonggang; Rogers, John A.; Nazar, Linda F.; Paik, Ungyu
- Abstract
Si-Ge composites have recently been explored as an anode material for lithium-ion batteries due to their stable cycle performance and excellent rate capability. Although previous reports show the benefits of Si-Ge composites on electrochemical performance, the specific mechanism and structural effects have been overlooked. Here, the structural effect of Si-Ge heterogeneous nanostructures on both mechanics and kinetics is systematically studied through theoretical analysis and detailed experimental results. Si-Ge and Ge-Si core-shell nanowires are employed for this study. The Si-Ge core-shell nanowires show a much improved electrochemical performance, especially cycle performance and rate capability, when compared to those of the Ge-Si core-shell nanowires electrode. On the basis of the detailed experimental results and associated theoretical analysis, its is demonstrated that the strain distribution and Li diffusivity and/or diffusion path are significantly affected by the Si-Ge heterostructure, which induce different mechanics and kinetics associated with lithium.
- Subjects
LITHIUM-ion batteries; ELECTRON transport; SCANNING electron microscopes; NANOWIRE crystallography; LITHIATION
- Publication
Advanced Functional Materials, 2014, Vol 24, Issue 10, p1458
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.201302122