期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 10, 页码 7607-7614出版社
AMER CHEMICAL SOC
DOI: 10.1021/am500855a
关键词
lithium-ion batteries; silicon; nanowire; anode; surface functionality; electrochemistry
资金
- EMD-Millipore Inc. under the Material Science and Technology Division, Work-for Others (WFO) Program [WF680901]
- U.S. Department of Energy [DE-AC05-000R22725]
- Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the U.S. Department of Energy
We report the synthesis of silicon nanowires using the supercritical-fluid-liquid-solid growth method from two silicon precursors, monophenylsilane and trisilane. The nanowires were synthesized at least on a gram scale at a pilot scale facility, and various surface modification methods were developed to optimize the electrochemical performance. The observed electrochemical performance of the silicon nanowires was clearly dependent on the origination of the surface functional group, either from the residual precursor or from surface modifications. On the basis of detailed electron microscopy, X-ray photoelectron spectroscopy, and confocal Raman spectroscopy studies, we analyzed the surface chemical reactivity of the silicon nanowires with respect to their electrochemical performance in terms of their capacity retention over continuous charge discharge cycles.
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