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Modelling of Lithium Whisker Dissolution

Werres, Martin Alexander and Latz, Arnulf and Horstmann, Birger (2021) Modelling of Lithium Whisker Dissolution. Virtuelle DPG-Frühjahrstagung des Fachverbandes Oberflächenphysik, 1-4. März 2021, Deutschland.

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Abstract

In the search for next generation batteries, lithium metal anode research experiences a refreshed attention due to its high theoretical energy density. Focus lies on enhancing the durability of lithium metal anode batteries and eliminating safety concerns. The battery capacity fades over cycling due to continuous SEI buildup, consuming lithium and electrolyte, and the formation of inactive lithium, which is electrically disconnected from the anode. As the surface of the anode is highly irregular and tends to form whisker during charging, experiments show that during discharge, the tip of the whisker is not dissolved and a droplet stays behind inside the SEI shell. We developed a generalized phase-field model of the dissolution in order to gain insights in the droplet formation process. Utilizing non-equilibrium thermodynamics, our phase-field model describes the dissolution of a single lithium whisker by taking the surface tension of lithium metal into account, and the interaction between lithium and the SEI. We are able to predict the nucleation of a Reyleigh instability behind the tip, leading to the formation of an electronically isolated lithium metal droplet.

Item URL in elib:https://elib.dlr.de/147390/
Document Type:Conference or Workshop Item (Poster)
Title:Modelling of Lithium Whisker Dissolution
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Werres, Martin AlexanderMartin.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:1 March 2021
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:lithium metal dissolution, dead lithium, lithium whisker
Event Title:Virtuelle DPG-Frühjahrstagung des Fachverbandes Oberflächenphysik
Event Location:Deutschland
Event Type:international Conference
Event Dates:1-4. März 2021
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 10:32
Last Modified:21 Dec 2021 10:32

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