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024 7 _ |a 10.1002/batt.202300445
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100 1 _ |a Cloos, Lisa
|0 0009-0006-1001-2891
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245 _ _ |a Thermal Transients to Accelerate Cyclic Aging of Lithium‐Ion Batteries
260 _ _ |a Weinheim
|c 2024
|b Wiley-VCH
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520 _ _ |a Cyclic aging tests of lithium-ion batteries are very time-consuming. Therefore, it is necessary to reduce the testing time by tightening the testing conditions. However, the acceleration with this approach is limited without altering the aging mechanisms. In this paper, we investigate whether and how thermal transients accelerate the aging. The tests are performed on NMC/graphite pouch cells by applying temperatures in a range of 5 °C to 45 °C to the cell surface. The results show, that an accelerated capacity loss can be achieved in comparison to the reference cell at a steady-state temperature of 25 °C. However, capacity difference analysis (CDA) prognoses a covering layer for the transient cells, which is confirmed upon post-mortem analysis. We suspect the origin to lie in the dynamics of temperature fields and current distribution during temperature changes when charging. More specifically, areas of higher temperature in the cell lead to high local current densities and plating. Subsequently, high temperatures promote the reaction of the plated lithium with electrolyte. The results show that thermal transients are a critical condition for lifetime and safety and should be treated with caution as they can occur during real life operation.
536 _ _ |a 1223 - Batteries in Application (POF4-122)
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700 1 _ |a Queisser, Oliver
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700 1 _ |a Chahbaz, Ahmed
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700 1 _ |a Paarmann, Sabine
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700 1 _ |a Sauer, Dirk Uwe
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700 1 _ |a Wetzel, Thomas
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773 _ _ |a 10.1002/batt.202300445
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