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.

Autor: Stuckenberg S; MEET Battery Research Center, University of Münster, Corrensstraße 46, 48149, Münster, Germany., Bela MM; MEET Battery Research Center, University of Münster, Corrensstraße 46, 48149, Münster, Germany., Lechtenfeld CT; MEET Battery Research Center, University of Münster, Corrensstraße 46, 48149, Münster, Germany., Mense M; MEET Battery Research Center, University of Münster, Corrensstraße 46, 48149, Münster, Germany., Küpers V; MEET Battery Research Center, University of Münster, Corrensstraße 46, 48149, Münster, Germany., Ingber TTK; MEET Battery Research Center, University of Münster, Corrensstraße 46, 48149, Münster, Germany., Winter M; MEET Battery Research Center, University of Münster, Corrensstraße 46, 48149, Münster, Germany.; Helmholtz-Institute Münster (HI MS), IEK-12, Forschungszentrum Jülich GmbH, Corrensstraße 46, 48149, Münster, Germany., Stan MC; MEET Battery Research Center, University of Münster, Corrensstraße 46, 48149, Münster, Germany.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Feb; Vol. 20 (6), pp. e2305203. Date of Electronic Publication: 2023 Oct 05.
DOI: 10.1002/smll.202305203
Abstrakt: 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 (LiNO 3 ) 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 LiNi 0.6 Co 0.2 Mn 0.2 O 2 positive electrode in NCM622||Cu-cells, a carbonate-based electrolyte, and a LiNO 3 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 LiNO 3 in the electrolyte, maintained by the LiNO 3 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 LiNO 3 from the separator. The results indicate that the strategy of using a LiNO 3 enriched separator instead of LiNO 3 as a sacrificial electrolyte additive can improve the performance of ZELMBs further by maintaining a compact and thus stable SEI layer on Li deposits.
(© 2023 The Authors. Small published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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