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Evolution of lithiation thermodynamics with the graphitization of carbons

Reynier, Y. and Yazami, R. and Fultz, B. and Barsukov, I. (2007) Evolution of lithiation thermodynamics with the graphitization of carbons. Journal of Power Sources, 165 (2). pp. 552-558. ISSN 0378-7753. doi:10.1016/j.jpowsour.2006.10.024.

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Instrumentation was developed to study the thermodynamics of lithium intercalation in cokes that were heat-treated at different temperatures. The method measures the open circuit voltages of electrochemical cells as a function of temperature, and obtains the entropy and enthalpy of the lithiation reaction. X-ray diffractometry and Raman spectroscopy were used to determine the structure of the carbon materials after heat treatment. The effect of the degree of graphitization on the entropy and enthalpy of lithium intercalation was thereby determined. A model is proposed to correlate the degree of graphitization to entropy profiles. It is shown that graphs of entropy versus open circuit voltage for different states of charge give quantitative information on graphitization, making them useful for the structural characterization of partially-graphitized carbons.

Item Type:Article
Related URLs:
URLURL TypeDescription
Yazami, R.0000-0002-0085-5012
Fultz, B.0000-0002-6364-8782
Additional Information:© 2006 Elsevier B.V. Available online 17 November 2006.
Subject Keywords:Carbon; Graphite; Lithium; Thermodynamics; Entropy
Issue or Number:2
Record Number:CaltechAUTHORS:20101007-102744850
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20335
Deposited By: Jason Perez
Deposited On:13 Oct 2010 21:11
Last Modified:08 Nov 2021 23:59

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