Fullerene C60 Coated Silicon Nanowires as Anode Materials for Lithium Secondary Batteries

Title
Fullerene C60 Coated Silicon Nanowires as Anode Materials for Lithium Secondary Batteries
Authors
Arenst Andreas Arie이중기
Keywords
Si NWs; C60 Coated; Lithium Secondary Batteries; Anode
Issue Date
2012-04
Publisher
Journal of nanoscience and nanotechnology
Citation
VOL 12, NO 4, 3547-3551
Abstract
A Fullerene C60 film was introduced as a coating layer for silicon nanowires (Si NWs) by a plasma assisted thermal evaporation technique. The morphology and structural characteristics of the materials were studied by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). SEM observations showed that the shape of the nanowire structure was maintained after the C60 coating and the XPS analysis confirmed the presence of the carbon coating layer. The electrochemical characteristics of C60 coated Si NWs as anode materials were examined by charge– discharge tests and electrochemical impedance measurements. With the C60 film coating, Si NW electrodes exhibited a higher initial coulombic efficiency of 77% and a higher specific capacity of 2020 mA h g−1 after the 30th cycle at a current density of 100 μA cm−2 with cut-off voltage between 0–1.5 V. These improved electrochemical characteristics are attributed to the presence of the C60 coating layer which suppresses side reaction with the electrolyte and maintains the structural integrity of the Si NW electrodes during cycle tests.
URI
http://pubs.kist.re.kr/handle/201004/42806
ISSN
15334880
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KIST Publication > Article
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