Effect of Carbon-coated Silicon/Graphite Composite Anode on the Electrochemical Properties

Authors
Kim, Hyung SunChung, Kyung YoonCho, Byung Won
Issue Date
2008-10
Publisher
WILEY-V C H VERLAG GMBH
Citation
BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.29, no.10, pp.1965 - 1968
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 degrees 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.
Keywords
LITHIUM ION BATTERIES; STRUCTURAL EVOLUTION; SI ANODE; SILICON; LITHIUM ION BATTERIES; STRUCTURAL EVOLUTION; SI ANODE; SILICON; Nanosized Si; Carbon coating; Lithium ion battery; Composite anode
ISSN
0253-2964
URI
https://pubs.kist.re.kr/handle/201004/133112
Appears in Collections:
KIST Article > 2008
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