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Published March 20, 2007 | public
Journal Article

Evolution of lithiation thermodynamics with the graphitization of carbons

Abstract

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.

Additional Information

© 2006 Elsevier B.V. Available online 17 November 2006.

Additional details

Created:
August 22, 2023
Modified:
October 20, 2023