Investigations of Si Thin Films as Anode of Lithium-Ion Batteries
- Western Michigan Univ., Kalamazoo MI (United States). Dept. of Chemical and Paper Engineering
- Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
- Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Science and Engineering Division
- Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
Amorphous silicon thin films having various thicknesses were investigated as a negative electrode material for lithium-ion batteries. Electrochemical characterization of the 20 nm thick thin silicon film revealed a very low first cycle Coulombic efficiency, which can be attributed to the silicon oxide layer formed on both the surface of the as-deposited Si thin film and the interface between the Si and the substrate. Among the investigated films, the 100 nm Si thin film demonstrated the best performance in terms of first cycle efficiency and cycle life. Observations from scanning electron microscopy demonstrated that the generation of cracks was inevitable in the cycled Si thin films, even as the thickness of the film was as little as 20 nm, which was not predicted by previous modeling work. However, the cycling performance of the 20 and 100 nm silicon thin films was not detrimentally affected by these cracks. Lastly, the poor capacity retention of the 1 mu m silicon thin film was attributed to the delamination.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1426216
- Journal Information:
- ACS Applied Materials and Interfaces, Vol. 10, Issue 4; ISSN 1944-8244
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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