Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Effect of Carbon-coated Silicon/Graphite Composite Anode on the Electrochemical Properties

  • Kim, Hyung-Sun (Battery Research Center, Korea Institute of Science and Technology (KIST)) ;
  • Chung, Kyung-Yoon (Battery Research Center, Korea Institute of Science and Technology (KIST)) ;
  • Cho, Byung-Won (Battery Research Center, Korea Institute of Science and Technology (KIST))
  • Published : 2008.10.20
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Abstract

The effects of carbon-coated silicon/graphite (Si/Gr.) composite anode on the electrochemical properties were investigated. The nanosized silicon particle shows a good cycling performance with a reasonable value of the first reversible capacity as compared with microsized silicon particle. The carbon-coated silicon/graphite composite powders have been prepared by pyrolysis method under argon/10 wt% propylene gas flow at $700{^{\circ}C}$ for 7 h. Transmission electron microscopy (TEM) analysis indicates that the carbon layer thickness of 5 nm was coated uniformly onto the surface silicon powder. It is confirmed that the insertion of lithium ions change the crystalline silicon phase into the amorphous phase by X-ray diffraction (XRD) analysis. The carbon-coated composite silicon/graphite anode shows excellent cycling performance with a reversible value of 700 mAh/g. The superior electrochemical characteristics are attributed to the enhanced electronic conductivity and low volume change of silicon powder during cycling by carbon coating.

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