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Electrochemical Properties of Si- Ge Heterostructures as an Anode Material for Lithium Ion Batteries

Title
Electrochemical Properties of Si- Ge Heterostructures as an Anode Material for Lithium Ion Batteries
Author
백운규
Keywords
batteries; alloys; charge transport; HIGH-CAPACITY; SILICON NANOWIRES; CURRENT COLLECTOR; INVERSE-OPAL; ELECTRODES; PERFORMANCE; DIFFUSION
Issue Date
2014-03
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED FUNCTIONAL MATERIALS, 2014, 24(10), P.1458-1464
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.
URI
http://onlinelibrary.wiley.com/doi/10.1002/adfm.201302122/fullhttp://hdl.handle.net/20.500.11754/49469
ISSN
1616-301X; 1616-3028
DOI
10.1002/adfm.201302122
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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