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End-of-Life Prediction of a Lithium-Ion Battery Cell Based on Mechanistic Aging Models of the Graphite Electrode

  • We present an electrochemical model of a lithium iron phosphate/graphite (LFP/C6) cell that includes combined aging mechanisms: (i) Electrochemical formation of the solid electrolyte interphase (SEI) at the anode, leading to loss of lithium inventory, (ii) breaking of the SEI due to volume changes of the graphite particles, causing accelerated SEI growth, and (iii) loss of active material due toWe present an electrochemical model of a lithium iron phosphate/graphite (LFP/C6) cell that includes combined aging mechanisms: (i) Electrochemical formation of the solid electrolyte interphase (SEI) at the anode, leading to loss of lithium inventory, (ii) breaking of the SEI due to volume changes of the graphite particles, causing accelerated SEI growth, and (iii) loss of active material due to of loss percolation of the liquid electrolyte resulting from electrode dry-out. The latter requires the introduction of an activity-saturation relationship. A time-upscaling methodology is developed that allows to simulate large time spans (thousands of operating hours). The combined modeling and simulation framework is able to predict calendaric and cyclic aging up to the end of life of the battery cells. The aging parameters are adjusted to match literature calendaric and cyclic aging experiments, resulting in quantitative agreement of simulated nonlinear capacity loss with experimental data. The model predicts and provides an interpretation for the dependence of capacity loss on temperature, cycling depth, and average SOC. The introduction of a percolation threshold in the activity-saturation relationship allows to capture the strong nonlinearity of aging toward end of life (“sudden death”).show moreshow less

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Metadaten
Author:Christian KupperORCiD, Björn Weißhar, Sascha Rißmann, Wolfgang G. BesslerORCiDGND
Publisher:The Electrochemical Society
Place of publication:Pennington, NJ
Year of Publication:2018
Language:English
Parent Title (English):Journal of The Electrochemical Society
Volume:165
Issue:14
ISSN:0013-4651
First Page:A3468
Last Page:A3480
Document Type:Article (reviewed)
open_access (DINI-Set):open_access
Institutes:Bibliografie
Acces Right:Frei zugänglich
Release Date:2019/01/15
Licence (German):License LogoEs gilt das UrhG
DOI:https://doi.org/10.1149/2.0941814jes