Aging Mechanism For Calendar Aging of Li-Ion Cells With Si/Graphite Anodes

• DOI: 10.1149/1945-7111/ad1b7c
• Publication Date: 2024-01-16T11:15:31Z
• Authors: Katharina Bischof; Marius Flügel; Markus Hölzle; Margret Wohlfahrt...; Thomas Waldmann
• Keywords: Arrhenius plot

Calendar aging of Li-ion batteries with Si/graphite electrodes was investigated within this study. A total 121 single-layer pouch full cells either graphite or (3.0 wt−%, 5.8 wt−% and 20.8 Si) anodes NMC622 cathodes the same N/P ratio were built on pilot-scale. studied at SoC 30%, 60%, 100%, as well temperature (25 °C, 45 60 °C) time dependence. The data analyzed in terms capacity fade a square-root behavior observed. Differential voltage analysis (DVA) has been performed function time. observed dependence is best described by dependent, 3D Arrhenius plots. Post-Mortem (SEM, EDX, GD-OES) applied to investigate changes electrode material level. Conclusions are drawn main mechanisms for calendar differences between pure discussed. Si-containing show combination lithium inventory loss accessible Si active material, both caused SEI growth.