Journal Article

FZJ-2025-00351

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Experimental correlation of anionic mass transport and lithium dendrite growth in solid-state polymer-based lithium metal batteries

Thienenkamp, J. H. (Corresponding author)FZJ* ; Lennartz, P.FZJ* ; Winter, M.FZJ* ; Brunklaus, G. (Corresponding author)FZJ*

2024
Elsevier [New York, NY]

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Please use a persistent id in citations: doi:10.1016/j.xcrp.2024.102340  doi:10.34734/FZJ-2025-00351

Abstract: Various metal deposition models have been proposed for alkali metal batteries, but the experimental acces-sibility of designated driving forces and characteristics of specific morphologies is still limited. A combinedmethod portfolio comprising operando 1D 19 F MRI, in situ 7 Li NMR, and dynamic electrochemical impedancespectroscopy (EIS) experiments is presented. Experimental evidence of the relation of capacity-degradingdendritic Li metal growth and anionic mass-transport quantities beyond Sand’s time in polymer-based Limetal batteries is demonstrated. Comparison of anionic mass transport and morphological changes in Limetal in Li||Li and NMC 622||Li cells revealed that elevated anion drift velocities within electrolytes are corre-lated with pronounced dendrite growth. Higher cell voltages are associated with increased anion drift veloc-ities and hence dendrite growth, as reflected by a 2.5-fold increase in velocities in NMC 622||Li compared to Li||Li cells. This highlights the potential of the introduced method portfolio for experimental evaluation of poly-mer electrolytes and artificial coatings suitable for alkali metal batteries

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Contributing Institute(s):

1. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IMD-4)

Research Program(s):

1. 1222 - Components and Cells (POF4-122) (POF4-122)
2. For-Analytik (BMBF-13XP0445) (BMBF-13XP0445)
3. FB2-POLY - Zellplattform Polymere (BMBF-13XP0429A) (BMBF-13XP0429A)

Appears in the scientific report 2024

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