Abstract
The effects of crystal orientation and the presence of impurity phase on Li-ion insertion and extraction processes and oxidation behavior of propylene carbonate (PC) containing were investigated by using thin films prepared by the sol-gel process and rf sputtering with cyclic voltammetry, electrochemical impedance measurement, in situ Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). Three kinds of thin film electrodes were prepared by rf sputtering and sol-gel processes. These electrodes contained different amounts of cubic phase as an impurity phase and had different crystal orientations depending on the preparation conditions. These properties greatly influenced the electrochemical behaviors and adsorption phenomena of oxidation products derived from PC. The organic surface film on thin film was analyzed with XPS. This surface film formation also depended on the crystal orientation and amount of impurity involved in the thin films. When the (003) plane of the is more perpendicular to substrate and the thin film does not contain impurity, the best electrochemical performance can be attained.
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