In situ SERS spectroscopy of Ag-modified pyrolytic graphite in organic electrolytes

被引:16
作者
Itoh, T [1 ]
Abe, K [1 ]
Mohamedi, M [1 ]
Nishizawa, M [1 ]
Uchida, I [1 ]
机构
[1] Tohoku Univ, Grad Sch Engn, Dept Appl Chem, Aoba Ku, Sendai, Miyagi 9808579, Japan
关键词
Raman spectroscopy; surface enhanced Raman scattering; graphite electrodes; lithium ion secondary batteries; electrochemical intercalation;
D O I
10.1007/s100080000139
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
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.
引用
收藏
页码:328 / 333
页数:6
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