In situ SERS spectroscopy of Ag-modified pyrolytic graphite in organic electrolytes |
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Authors: | Takashi Itoh Koji Abe Mohamed Mohamedi Matsuhiko Nishizawa Isamu Uchida |
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Institution: | (1) Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aramaki-Aoba, Aoba-ku, Sendai 980-8579, Japan, |
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Abstract: | Surface enhanced Raman scattering (SERS) has been applied to study the lithium intercalation/deintercalation process at the
interface of a pyrolytic graphite electrode with propylene and ethylene carbonate containing organic solutions. We have focused
on the lattice vibration of the most outer graphite surface layer simultaneously with cyclic voltammetric measurements. In
situ Raman spectroscopy performed in this way allowed us to determine the La value that describes the size of graphitic microcrystallites along the a-axis. It was found that the La value decreases when the electrode is polarized to potentials between 0.02 and 1.0 V. This phenomenon can be correlated with
the intercalation of lithium ions into the graphene structure. According to the spectral change, the size of the graphitic
microcrystallites shows reversible behavior with potential cycling at the surface of the electrode.
Electronic Publication |
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Keywords: | Raman spectroscopy Surface enhanced Raman scattering Graphite electrodes Lithium ion secondary batteries Electrochemical intercalation |
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