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(s)
송태섭Huanyu Cheng[Huanyu Cheng]Kaitlin Town[Kaitlin Town]Hyunjung Park[Hyunjung Park]Robert W. Black[Robert W. Black]Sangkyu Lee[Sangkyu Lee]Won Il Park[Won Il Park]Yonggang Huang[Yonggang Huang]John A. Rogers[John A. Rogers]Linda F. Nazar[Linda F. Nazar]Ungyu Paik[Ungyu Paik]
Keywords
HIGH-CAPACITY; SILICON NANOWIRES; CURRENT COLLECTOR; INVERSE-OPAL; ELECTRODES; PERFORMANCE; DIFFUSION
Issue Date
201403
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED FUNCTIONAL MATERIALS, v.24, no.10, pp.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://hdl.handle.net/YU.REPOSITORY/32941http://dx.doi.org/10.1002/adfm.201302122
ISSN
1616-301X
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공과대학 > 신소재공학부 > Articles
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