Journal Article

FZJ-2023-01640

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Effective Lithium Passivation through Graphite Coating for Lithium Metal Batteries

Weber, F. M.FZJ* ; Graff, K. M. ; Kohlhaas, I. ; Figgemeier, E. (Corresponding author)FZJ*

2023
ACS Publications Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/34389  doi:10.1021/acsaem.2c04128

Abstract: Metallic lithium reacts with organic solvents, resulting in their decomposition. The prevention of these decomposition reactions is a key aspect enabling the use of metallic lithium as an anode in lithium metal batteries. Scanning electrochemical microscopy (SECM), laser microscopy, and Fourier transform infrared (FT-IR) spectroscopy were used to analyze the effect of a graphite coating on metallic lithium. The graphite layer successfully prevents the agglomeration of decomposition products on the surface. SECM data show that the surface of untreated lithium metal in electrolyte is insulating, but the surface of the graphite coated lithium appears conducting and is therefore not covered by any layer of decomposition products. The protective properties of the graphite layer were proofed using FT-IR data. No significant differences in the spectra evolved during immersion of the sample in the electrolyte. Electrochemical plating experiments and post-mortem analysis revealed that the graphite layer did not result in homogeneous lithium plating depending on the current density. At high currents, no fully covering layer of decomposition products was formed on the surface during plating experiments, indicating a more complex mechanism of solid–electrolyte interface formation.

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Contributing Institute(s):

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

Research Program(s):

1. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)
2. Lillint - Thermodynamic and kinetic stability of the Lithium-Liquid Electrolyte Interface (13XP0225B) (13XP0225B)

Appears in the scientific report 2023

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 5 ; JCR ; SCOPUS ; Web of Science Core Collection

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