Journal
JOURNAL OF POWER SOURCES
Volume 153, Issue 2, Pages 312-318Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2005.05.087
Keywords
graphite; lithium; entropy; stage; phase transition
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We found anomalous behaviors during lithium electrochemical intercalation into graphite in the entropy curve and the crystal structure, especially, during the stages from 2 to I transition at x = 0.5 in LixC6. The entropy first decreases monotonously, then re-increased sharply at the transition. The average interlayer spacing displays a hysteresis during intercalation and de-intercalation and departs from linearity. The results are discussed in relation with a contribution of the vibrational entropy and possible occurrence of intermediary phase(s) between the two lithium-rich intercalation stages. (c) 2005 Elsevier B.V. All rights reserved.
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