Journal
JOURNAL OF POWER SOURCES
Volume 196, Issue 22, Pages 9820-9824Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2011.07.006
Keywords
10 wt.% carbon coated natural graphite; Natural graphite; Carbon coating; Li intercalation; Li deposition
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10 wt.% carbon-coated natural graphite (NC-10) is prepared by thermal vapor deposition. The carbon coating is electrochemically investigated at -5 degrees C; it improves lithium intercalation in the graphite's interlayer spacing. NC-10 graphite clearly shows 3 voltage plateaus and a higher capacity during the first charge/discharge cycle at -5 degrees C than uncoated natural graphite. XRD study of the electrode after the first charging shows increased lithium intercalation into the graphite layers and also suppression of lithium deposition on the graphite's surface. Due to the homogeneous potential profile on the graphite surface, carbon coating enhance lithium intercalation at -5 degrees C. In addition, NC-10 shows less lithium deposition on the surface than bare natural graphite. (C) 2011 Elsevier B.V. All rights reserved.
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