期刊
ACS NANO
卷 7, 期 3, 页码 2249-2257出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn3053632
关键词
silicon; germanium; SiGe; lithium-ion battery; glancing angle deposition
类别
资金
- Welch Foundation [F-1131, F-1436, F-1464]
- Hertz Foundation
- National Science Foundation [0618242]
Both silicon and germanium are leading candidates to replace the carbon anode of lithium ions batteries. Silicon Is attractive because of its high lithium storage capacity while germanium, a superior electronic and ionic conductor, can support much higher charge/discharge rates. Here we investigate the electronic, electrochemical and optical properties of Si(1-x)Gex thin films with x = 0, 0.25, 0.5, 0.75, and 1. Glancing angle deposition provided amorphous films of reproducible nanostructure and porosity. The film's composition and physical properties were investigated by X-ray photoelectron spectroscopy, four-point probe conductivity, Raman, and UV-vis absorption spectroscopy. The films were assembled into coin cells to test their electrochemical properties as a lithium-Ion battery anode material. The cells were cycled at various C-rates to determine the upper limits for high rate performance. Adjusting the composition In the Si(1-x)Gex system demonstrates a trade-off between rate capability and specific capacity. We show that high-capacity silicon anodes and high-rate germanium anodes are merely the two extremes; the composition of Si(1-x)Gex alloys provides a new parameter to use in electrode optimization.
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