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Recent Progress in Advanced Materials for Lithium Ion Batteries
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Structural and Electrochemical Investigation during the First Charging Cycles of Silicon Microwire Array Anodes for High Capacity Lithium Ion Batteries

Institute for Materials Science, Christian-Albrechts-University of Kiel, Kaiserstr. 2, Kiel 24143, Germany
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Materials 2013, 6(2), 626-636; https://doi.org/10.3390/ma6020626
Received: 10 December 2012 / Revised: 4 February 2013 / Accepted: 19 February 2013 / Published: 22 February 2013
(This article belongs to the Special Issue Advanced Materials for Lithium Ion Batteries)
Silicon microwire arrays embedded in Cu present exceptional performance as anode material in Li ion batteries. The processes occurring during the first charging cycles of batteries with this anode are essential for good performance. This paper sheds light on the electrochemical and structural properties of the anodes during the first charging cycles. Scanning Electron Microscopy, X-ray diffractommetry, and fast Fourier transformation impedance spectroscopy are used for the characterization. It was found that crystalline phases with high Li content are obtained after the first lithiation cycle, while for the second lithiation just crystalline phases with less Li are observable, indicating that the lithiated wires become amorphous upon cycling. The formation of a solid electrolyte interface of around 250 nm during the first lithiation cycle is evidenced, and is considered a necessary component for the good cycling performance of the wires. Analog to voltammetric techniques, impedance spectroscopy is confirmed as a powerful tool to identify the formation of the different Si-Li phases. View Full-Text
Keywords: Li-ion batteries; Si microwire array; Si anode; in situ impedance spectroscopy; high capacity; solid electrolyte interface (SEI) formation; Si-Li phases Li-ion batteries; Si microwire array; Si anode; in situ impedance spectroscopy; high capacity; solid electrolyte interface (SEI) formation; Si-Li phases
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MDPI and ACS Style

Quiroga-González, E.; Carstensen, J.; Föll, H. Structural and Electrochemical Investigation during the First Charging Cycles of Silicon Microwire Array Anodes for High Capacity Lithium Ion Batteries. Materials 2013, 6, 626-636.

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