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Li-ion batteries aging model behavior's issues
Posted Jun 18, 2025, 4:46 a.m. EDT Battery Design, Electrochemistry, Equation-Based Modeling Version 6.3 0 Replies
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Hello, I have developed an electrochemical aging model for an LFP cell (with graphite on the negative electrode). The assumptions on which the model is based are: 1. Aging is solely due to SEI growth and lithium plating at the negative electrode. 2. Lithium plating occurs only when the overpotential at the negative electrode drops below 0 V. However, I am encountering three issues with the model's behavior: 1. The cell capacity drops more quickly at lower C-rates, whereas the drop should slow down when the current rate decreases. 2. During cycling, when the overpotential at the negative electrode falls below 0 V, the capacity fade slows down instead of accelerating when cycling at et voltage range between 3.2V and 3.65V. 3. Temperature variation does not appear to influence the rate of capacity degradation.
I kindly ask for your support in resolving this issue, which has been a significant obstacle to my progress for several weeks. To reduce the file size, I removed the stored simulation results. Please remember to run the simulation after opening the file.
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Hello Nanguele Kone
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