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Structural and Electrochemical Properties of Fullerene-coated Silicon Thin Film as Anode Materials for Lithium Secondary Batteries
By performing a plasma evaporation technique, fullerene C60 was used as a coating material onto a silicon
thin film anode for lithium secondary batteries. The effect of the plasma power (20W, 100W and
200W) in the plasma coating process on the structural and electrochemical properties of the fullerene
C60-coated silicon anode was then studied by means of Raman spectroscopy, Fourier transform infra red
(FTIR) spectroscopy, scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy
and charge/discharge tests. The Raman and FTIR analysis showed that the polymeric phase of fullerene
C60 was formed during the deposition operation and that the fullerene monomers were polymerized to
a greater extent at a high plasma power operation (200 W). Furthermore, the fullerene C60-coated silicon
electrode obtained at a plasma power of 200W exhibited excellent electrochemical performance with a
specific capacity of more than 2000mAhg−1. The stable polymeric phase of fullerene C60 was found to be
the main factor enhancing the electrochemical performance of the fullerene-coated silicon anode.
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