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Title: In situ Raman spectroscopy on silicon nanowire anodes integrated in lithium ion batteries
Authors: Krause, A.Tkacheva, O.Omar, A.Langklotz, U.Giebeler, L.Dörfler, S.Fauth, F.Mikolajick, T.Weber, W.M.
Publishers Version:
Issue Date: 2019
Published in: Journal of the Electrochemical Society Vol. 166 (2019), No. 3
Publisher: Pennington, NJ : Electrochemical Society Inc.
Abstract: Rapid decay of silicon anodes during lithiation poses a significant challenge in application of silicon as an anode material in lithium ion batteries. In situ Raman spectroscopy is a powerful method to study the relationship between structural and electrochemical data during electrode cycling and to allow the observation of amorphous as well as liquid and transient species in a battery cell. Herein, we present in situ Raman spectroscopy on high capacity electrode using uncoated and carbon-coated silicon nanowires during first lithiation and delithiation cycle in an optimized lithium ion battery setup and complement the results with operando X-ray reflection diffraction measurements. During lithiation, we were able to detect a new Raman signal at 1859 cm−1 especially on uncoated silicon nanowires. The detailed in situ Raman measurement of the first lithiation/delithiation cycle allowed to differentiate between morphology changes of the electrode as well as interphase formation from electrolyte components.
Keywords: Anodes; Electrochemical electrodes; Electrolytes; Ions; Nanowires; Raman spectroscopy; Silicon; Silicon batteries; Diffraction measurements; Electrochemical data; High-Capacity Electrodes; In-situ Raman spectroscopy; Lithiation/delithiation; Morphology changes; Silicon nanowires; Transient species; Lithium-ion batteries
DDC: 540
License: CC BY 4.0 Unported
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