Exploring the Impact of State of Charge and Aging on the Entropy Coefficient of Silicon–Carbon Anodes
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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-11-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/17/22/5790 |
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| author | Kevin Böhm Simon Zintel Philipp Ganninger Jonas Jäger Torsten Markus David Henriques |
| author_facet | Kevin Böhm Simon Zintel Philipp Ganninger Jonas Jäger Torsten Markus David Henriques |
| author_sort | Kevin Böhm |
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| description | 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. |
| format | Article |
| id | doaj-art-b0f287d3d5234c278922719c0255b38d |
| institution | Kabale University |
| issn | 1996-1073 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-b0f287d3d5234c278922719c0255b38d2024-11-26T18:02:48ZengMDPI AGEnergies1996-10732024-11-011722579010.3390/en17225790Exploring the Impact of State of Charge and Aging on the Entropy Coefficient of Silicon–Carbon AnodesKevin Böhm0Simon Zintel1Philipp Ganninger2Jonas Jäger3Torsten Markus4David Henriques5Institute for Materials Science and Engineering (IMaSE), Mannheim University of Applied Sciences, Paul-Wittsack-Straße 10, 68163 Mannheim, GermanyInstitute for Materials Science and Engineering (IMaSE), Mannheim University of Applied Sciences, Paul-Wittsack-Straße 10, 68163 Mannheim, GermanyInstitute for Materials Science and Engineering (IMaSE), Mannheim University of Applied Sciences, Paul-Wittsack-Straße 10, 68163 Mannheim, GermanyInstitute for Materials Science and Engineering (IMaSE), Mannheim University of Applied Sciences, Paul-Wittsack-Straße 10, 68163 Mannheim, GermanyInstitute for Materials Science and Engineering (IMaSE), Mannheim University of Applied Sciences, Paul-Wittsack-Straße 10, 68163 Mannheim, GermanyInstitute for Materials Science and Engineering (IMaSE), Mannheim University of Applied Sciences, Paul-Wittsack-Straße 10, 68163 Mannheim, GermanyDue 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.https://www.mdpi.com/1996-1073/17/22/5790entropysiliconanodesheat generationthermodynamicsincremental capacity analysis |
| spellingShingle | Kevin Böhm Simon Zintel Philipp Ganninger Jonas Jäger Torsten Markus David Henriques Exploring the Impact of State of Charge and Aging on the Entropy Coefficient of Silicon–Carbon Anodes Energies entropy silicon anodes heat generation thermodynamics incremental capacity analysis |
| title | Exploring the Impact of State of Charge and Aging on the Entropy Coefficient of Silicon–Carbon Anodes |
| title_full | Exploring the Impact of State of Charge and Aging on the Entropy Coefficient of Silicon–Carbon Anodes |
| title_fullStr | Exploring the Impact of State of Charge and Aging on the Entropy Coefficient of Silicon–Carbon Anodes |
| title_full_unstemmed | Exploring the Impact of State of Charge and Aging on the Entropy Coefficient of Silicon–Carbon Anodes |
| title_short | Exploring the Impact of State of Charge and Aging on the Entropy Coefficient of Silicon–Carbon Anodes |
| title_sort | exploring the impact of state of charge and aging on the entropy coefficient of silicon carbon anodes |
| topic | entropy silicon anodes heat generation thermodynamics incremental capacity analysis |
| url | https://www.mdpi.com/1996-1073/17/22/5790 |
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