TY  - JOUR
AU  - Cloos, Lisa
AU  - Queisser, Oliver
AU  - Chahbaz, Ahmed
AU  - Paarmann, Sabine
AU  - Sauer, Dirk Uwe
AU  - Wetzel, Thomas
TI  - Thermal Transients to Accelerate Cyclic Aging of Lithium‐Ion Batteries
JO  - Batteries & supercaps
VL  - 7
IS  - 3
SN  - 2566-6223
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2024-02389
SP  - e202300445
PY  - 2024
N1  - Das Projekt wurde zudem gefördert durch: BMBF03XP0320D & BMBF03XP0320A
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001138288400001
DO  - DOI:10.1002/batt.202300445
UR  - https://juser.fz-juelich.de/record/1024723
ER  -