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Long-Term Self-Discharge Measurements and Modelling for Various Cell Types and Cell Potentials

  • Self-discharge of lithium-ion cells leads to voltage decay over time. In this work, the self-discharge was measured at 30 °C for three cell types at various voltage levels for about 150 days in a constant voltage mode determining the current at a high precision (float current). All cells exhibit a transient part leading to a steady-state, which is no longer influenced by reversible effects. To study the effect of the check-ups on the steady-state float current, the cells, interrupted and not interrupted by check-ups, were compared. The results indicate that both the transient processes and steady-state currents are highly reproducible. In the first period of the float current, the polarization dominates the measured current, followed by the anode overhang effect dominating the process for a period of 5–30 days. After the decline of both processes, a mostly constant steady-state in the order of µA is observed. The check-up interruption generally shows no apparent effect on the reached steady-state and results only in an extendedSelf-discharge of lithium-ion cells leads to voltage decay over time. In this work, the self-discharge was measured at 30 °C for three cell types at various voltage levels for about 150 days in a constant voltage mode determining the current at a high precision (float current). All cells exhibit a transient part leading to a steady-state, which is no longer influenced by reversible effects. To study the effect of the check-ups on the steady-state float current, the cells, interrupted and not interrupted by check-ups, were compared. The results indicate that both the transient processes and steady-state currents are highly reproducible. In the first period of the float current, the polarization dominates the measured current, followed by the anode overhang effect dominating the process for a period of 5–30 days. After the decline of both processes, a mostly constant steady-state in the order of µA is observed. The check-up interruption generally shows no apparent effect on the reached steady-state and results only in an extended settling time. A model to simulate the transient process and steady-state of float currents was developed. The model shows a high accuracy in reproducing the results and identifying the time needed to reach the steady-state.show moreshow less

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Metadaten
Author:Mohamed AzzamORCiD, Moritz EhrensbergerORCiD, Reinhard Scheuer, Christian EndischORCiD, Meinert LewerenzORCiD
Language:English
Document Type:Article
Year of first Publication:2023
published in (English):Energies
Publisher:MDPI
Place of publication:Basel
ISSN:1996-1073
Volume:16
Issue:9
Pages:19
Article Number:3889
Review:peer-review
Open Access:ja
Version:published
Tag:18650; LFP; NCA; NMC; anode overhang; filtering; float current analysis; graphite; modelling; potentiostatic hold; self-discharge rate
URN:urn:nbn:de:bvb:573-36693
Related Identifier:https://doi.org/10.3390/en16093889
Faculties / Institutes / Organizations:Fakultät Elektro- und Informationstechnik
Institut für Innovative Mobilität (IIMo)
Licence (German):License Logo Creative Commons BY 4.0
Release Date:2023/05/05