Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 13, Issue 10, Pages 1116-1118Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2011.07.014
Keywords
Safety of graphite anode; Carbon coating; Lithium deposition; Pulse polarization
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Funding
- Fukuoka Industry and Science Foundation
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Lithium deposition on graphite anodes is considered as a main reason for failures and safety for lithium ion batteries (LIB). Different amounts of carbon coating on the surface of natural graphite are used in this work to suppress the amount of lithium deposited at -10 degrees C. Pulse polarization experiments reveal relative polarization of graphite anodes at various temperatures and show that lithium deposition is accelerated at lowered temperatures. Electrochemical experiments, along with photographs, scanning electron microscopy (SEM) images and ex-situ X-ray diffraction (XRD) data suggest that carbon coating not only suppresses the lithium deposition but also enhances the formation of LiC6 at -10 degrees C. The homogeneous potential profile on the graphite surface attained by the carbon coating explains such an improved low temperature performance. as it allows efficient Solid Electrolyte Interface (SEI) film formation, which is a prerequisite for safety LIB. (C) 2011 Elsevier B.V. All rights reserved.
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