백운규
2018-03-20T04:54:16Z
2018-03-20T04:54:16Z
2014-03
ADVANCED FUNCTIONAL MATERIALS, 2014, 24(10), P.1458-1464
1616-301X
1616-3028
http://onlinelibrary.wiley.com/doi/10.1002/adfm.201302122/full
http://hdl.handle.net/20.500.11754/49469
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.
This work was supported by the Global Research Laboratory (GRL) Program (K20704000003TA050000310) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT (Information and Communication Technologies) and Future Planning, and the International Cooperation program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government of Ministry of Trade, Industry & Energy (2011T100100369).
en
WILEY-V C H VERLAG GMBH
batteries
alloys
charge transport
HIGH-CAPACITY
SILICON NANOWIRES
CURRENT COLLECTOR
INVERSE-OPAL
ELECTRODES
PERFORMANCE
DIFFUSION
Electrochemical Properties of Si- Ge Heterostructures as an Anode Material for Lithium Ion Batteries
Article
24
10.1002/adfm.201302122
1458-1464
ADVANCED FUNCTIONAL MATERIALS
Song, Taeseup
Cheng, Huanyu
Town, Kaitlin
Park, Hyunjung
Black, Robert W.
Lee, Sangkyu
Park, Won Il
Huang, Yonggang
Rogers, John A.
Paik, Ungyu
2014024249
S
COLLEGE OF ENGINEERING[S]
DEPARTMENT OF ENERGY ENGINEERING
upaik