Journal Article

FZJ-2024-02765

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png An Analysis of Calendaric Aging over 5 Years of Ni‐rich 18650‐Cells with Si/C Anodes

Frie, F. (Corresponding author) ; Ditler, H. ; Klick, S. ; Stahl, G. ; Rahe, C. ; Ghaddar, T. ; Sauer, D. U.FZJ*

2024
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/celc.202400020  doi:10.34734/FZJ-2024-02765

Abstract: 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.

Note: Zudem unterstützt durch BMBF Grant: “Meet Hi-EnDIII” (03XP0258C) und die Research Training Gruppe “mobilEM”(GRK 1856/11856/2)

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Contributing Institute(s):

1. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IEK-12)

Research Program(s):

1. 1223 - Batteries in Application (POF4-122) (POF4-122)
2. BMBF 03XP0084B - MEET Hi-EnD II - Weiterentwicklung und Untersuchung von Materialien auf metallischen Anodenwerkstoffen (BMBF-03XP0084B) (BMBF-03XP0084B)
3. BMBF 03XP0320A - BALd - Beschleunigte Alterungstests und Lebensdauerprognosen (BMBF-03XP0320A) (BMBF-03XP0320A)

Appears in the scientific report 2024

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