Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 24, Issue 10, Pages 1458-1464Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201302122
Keywords
batteries; alloys; charge transport
Categories
Funding
- Global Research Laboratory (GRL) Program through the National Research Foundation of Korea (NRF) [K20704000003TA050000310]
- Ministry of Science, ICT (Information and Communication Technologies) and Future Planning
- International Cooperation program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant
- Korea government of Ministry of Trade, Industry Energy [2011T100100369]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20118510010020] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2013K1A1A2032443] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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