18 research outputs found

    Synthesis of highly graphitized carbonaceous thin films by plasma assisted chemical vapor deposition and their electrochemical properties in propylene carbonate solution

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    Carbonaceous thin film electrode was prepared by plasma assisted chemical vapor deposition. The films were very flat and pin-hole free with c-axis orientation. X-ray diffraction and Raman spectroscopy revealed that the bulk of the film was highly graphitized but the surface of the film was less crystallized, indicating that the surface modified graphitized thin film electrode was obtained by a single process. Electrochemical properties of this film were studied in electrolyte of propylene carbonate (PC) containing 1moldm−3LiClO4 by cyclic voltammetry. The first cycle of voltammogram showed reduction current observed at 1.0–0.5 V (vs. Li/Li+), but the reduction current at those potentials completely disappeared over the second cycle. Large reduction and oxidation currents were observed near 0 V (vs. Li/Li+), and in addition, the peak splitting was observed for oxidation peaks near 0 V. These electrochemical properties are quite similar to that of graphite electrode used in Li-ion batteries. Keywords: Carbonaceous thin film electrode, Plasma CVD, Propylene carbonate, Li-ion batterie
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