%0 Journal Article
%A Frie, Fabian
%A Ditler, Heinrich
%A Klick, Sebastian
%A Stahl, Gereon
%A Rahe, Christiane
%A Ghaddar, Tala
%A Sauer, Dirk Uwe
%T An Analysis of Calendaric Aging over 5 Years of Ni‐rich 18650‐Cells with Si/C Anodes
%J ChemElectroChem
%V 11
%N 9
%@ 2196-0216
%C Weinheim
%I Wiley-VCH
%M FZJ-2024-02765
%P e202400020
%D 2024
%Z Zudem unterstützt durch BMBF Grant: “Meet Hi-EnDIII” (03XP0258C) und die Research Training Gruppe “mobilEM”(GRK 1856/11856/2)
%X Calendaric lifetime testing of lithium-ion cells is time-consuming and resource-intensive. As Dubarry et al.[1] state, testing is often limited to a few aging conditions. This paper presents the results of a long-term aging study on lithium-ion cells with a nickel-rich NCA cathode and a graphite-silicon anode. 69 cells were stored at 5 different voltages and under 4 different temperatures for 5 years. Regular reference performance tests (RPT) provide insights for State of Health (SoH) calculation and further analysis through differential voltage analysis. The results are verified against post-mortem analyses. The long aging period enables accurate determination of aging rates. Our results demonstrate that the storage voltage level strongly influences the degradation rate, with temperature playing a minor role. The identified aging effects include loss of active material on the cathode side and loss of lithium inventory. Initial degradation follows a urn:x-wiley:21960216:media:celc202400020:celc202400020-math-0001 -trajectory but is caused by overhang effects. The long-term aging is rather linear.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:001198756700001
%R 10.1002/celc.202400020
%U https://juser.fz-juelich.de/record/1025197