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Modelling of Lithium Droplet Formation During Lithium Dissolutio

Werres, Martin and Latz, Arnulf and Horstmann, Birger (2021) Modelling of Lithium Droplet Formation During Lithium Dissolutio. 748. WE-Heraeus-Seminar, 9.-12. Mai, Online Seminar.

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Abstract

Lithium metal anode batteries have regained a lot of research attention as they are promising candidates for next-generation energy storage systems. However, the poor Coulombic efficiency limits the battery’s cyclability. The main causes for low efficiencies are the irreversible loss of active lithium due to the formation of a solid electrolyte interface (SEI) and the formation of unreactive, dead metallic lithium which is disconnected from the current collector. Experiments show that during the dissolution of lithium whiskers, which grow as irregular structures during plating, the tip cannot be dissolved. We developed a generalized phase-field model of the dissolution process to gain insights into the underlying mechanisms of “dead” lithium formation and capacity fade. Our model describes the dissolution of a single lithium whisker in a liquid electrolyte based on lithium surface tension and the interaction between lithium and the interphase, utilizing the framework of non-equilibrium thermodynamics. We study under which circumstances instabilities occur and dead lithium forms. Our model predicts the nucleation of an instability for low stripping current densities, induced by interactions with the SEI. This leads to an incomplete dissolution and the formation of an electrically disconnected metallic lithium droplet, in agreement with optical microscope observations of lithium dissolution.

Item URL in elib:https://elib.dlr.de/147380/
Document Type:Conference or Workshop Item (Poster)
Title:Modelling of Lithium Droplet Formation During Lithium Dissolutio
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Werres, Martinmartin.werres (at) dlr.dehttps://orcid.org/0000-0001-7199-4848
Latz, ArnulfArnulf.Latz (at) dlr.dehttps://orcid.org/0000-0003-1449-8172
Horstmann, Birgerbirger.horstmann (at) dlr.dehttps://orcid.org/0000-0002-1500-0578
Date:21 December 2021
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:lithium dissolution, dead lithium, lithium whisker
Event Title:748. WE-Heraeus-Seminar
Event Location:Online Seminar
Event Type:Workshop
Event Dates:9.-12. Mai
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Electrochemical Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Storage
Location: Ulm
Institutes and Institutions:Institute of Engineering Thermodynamics > Computational Electrochemistry
Deposited By: Werres, Martin Alexander
Deposited On:21 Dec 2021 10:31
Last Modified:21 Dec 2021 10:31

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