Journal Article

FZJ-2024-02547

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Influence of LiNO 3 on the Lithium Metal Deposition Behavior in Carbonate‐Based Liquid Electrolytes and on the Electrochemical Performance in Zero‐Excess Lithium Metal Batteries

Stuckenberg, S. ; Bela, M. M. ; Lechtenfeld, C.-T. ; Mense, M. ; Küpers, V. ; Ingber, T. T. K. ; Winter, M.FZJ* ; Stan, M. C. (Corresponding author)FZJ*

2024
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/smll.202305203  doi:10.34734/FZJ-2024-02547

Abstract: Continuous lithium (Li) depletion shadows the increase in energy density and safety properties promised by zero-excess lithium metal batteries (ZELMBs). Guiding the Li deposits toward more homogeneous and denser lithium morphology results in improved electrochemical performance. Herein, a lithium nitrate (LiNO3) enriched separator that improves the morphology of the Li deposits and facilitates the formation of an inorganic-rich solid–electrolyte interphase (SEI) resulting in an extended cycle life in Li||Li-cells as well as an increase of the Coulombic efficiency in Cu||Li-cells is reported. Using a LiNi0.6Co0.2Mn0.2O2 positive electrode in NCM622||Cu-cells, a carbonate-based electrolyte, and a LiNO3 enriched separator, an extension of the cycle life by more than 50 cycles with a moderate capacity fading compared to the unmodified separator is obtained. The relative constant level of LiNO3 in the electrolyte, maintained by the LiNO3 enriched separator throughout the cycling process stems at the origin of the improved performance. Ion chromatography measurements carried out at different cycles support the proposed mechanism of a slow and constant release of LiNO3 from the separator. The results indicate that the strategy of using a LiNO3 enriched separator instead of LiNO3 as a sacrificial electrolyte additive can improve the performance of ZELMBs further by maintaining a compact and thus stable SEI layer on Li deposits.

Note: Unterstützt durch BMBF Grant: ProLiFest (03XP0253A)

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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. MEET HiEnD III - Materials and Components to Meet High Energy Density Batteries (13XP0258B) (13XP0258B)
3. DFG project 509322222 - Struktur, Dynamik und elektrochemische Stabilität von konzentrierten Elektrolyten in begrenzten Umgebungen (509322222) (509322222)

Appears in the scientific report 2024

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Essential Science Indicators ; IF >= 10 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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