Exploring the Impact of State of Charge and Aging on the Entropy Coefficient of Silicon–Carbon Anodes

Kevin Böhm, Simon Zintel, Philipp Ganninger, Jonas Jäger, Torsten Markus and David Henriques ()
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Kevin Böhm: Institute for Materials Science and Engineering (IMaSE), Mannheim University of Applied Sciences, Paul-Wittsack-Straße 10, 68163 Mannheim, Germany
Simon Zintel: Institute for Materials Science and Engineering (IMaSE), Mannheim University of Applied Sciences, Paul-Wittsack-Straße 10, 68163 Mannheim, Germany
Philipp Ganninger: Institute for Materials Science and Engineering (IMaSE), Mannheim University of Applied Sciences, Paul-Wittsack-Straße 10, 68163 Mannheim, Germany
Jonas Jäger: Institute for Materials Science and Engineering (IMaSE), Mannheim University of Applied Sciences, Paul-Wittsack-Straße 10, 68163 Mannheim, Germany
Torsten Markus: Institute for Materials Science and Engineering (IMaSE), Mannheim University of Applied Sciences, Paul-Wittsack-Straße 10, 68163 Mannheim, Germany
David Henriques: Institute for Materials Science and Engineering (IMaSE), Mannheim University of Applied Sciences, Paul-Wittsack-Straße 10, 68163 Mannheim, Germany

Energies, 2024, vol. 17, issue 22, 1-16

Abstract: Due to its improved capacity compared to graphite, silicon is a promising candidate to handle the demands of high-energy batteries. With the introduction of new materials, further aspects of the battery system must be reconsidered. One of those aspects is the heat generation during the charging and discharging of a cell, which delivers important information for the development of cooling systems, the battery management system and the overall performance of the cell. Since the reversible heat presents an important contribution to the overall heat generation during cycling, the entropy coefficient is the main value that needs to be determined. This study evaluates the entropy coefficient of custom-produced 2032 coin half-cells with lithium counter electrodes, containing 45 wt% nanosilicon and 45 wt% carbon black. The potentiometric method, utilizing VR and self-discharge curves, produced reliable results, yielding entropy coefficient values between 95% SoC and 10% SoC during delithiation. These values of the entropy coefficient are consistently negative. Furthermore, ICA measurements identified two phase transitions during delithiation, with these transitions shifting to lower SoC as SoH decreases, impacting the slope of the entropy coefficient.

Keywords: entropy; silicon; anodes; heat generation; thermodynamics; incremental capacity analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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