Journal
ELECTROCHIMICA ACTA
Volume 137, Issue -, Pages 311-319Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.05.153
Keywords
entropy; Lithium-ion; electrothermal impedance spectroscopy; thermal behavior; measurement
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The change of entropy Delta S is a distinctive characteristic of the thermal behavior of a lithium-ion cell. Usually, the change of entropy Delta S in an individual cell type or electrode material is determined by potentiometric measurements which, although precise, are time-consuming. Measurement times could be shortened by as much as a factor of 100 by using the method presented in this paper; electrothermal impedance spectroscopy (ETIS). Herein, the effectiveness of ETIS is demonstrated for three different forms of commercial lithium-ion cells. Interestingly enough, Delta S of all three cell types show a hysteresis behavior for cell charging and discharging, as well-known for the open circuit voltage. Furthermore, as the ETIS method offers a high SOC-resolution of Delta S this could lead to its application in cell diagnosis. (C) 2014 Elsevier Ltd. All rights reserved.
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