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The Effect of External Pressure on the Dissolution of Lithium in Li-Metal Batteries

Pool, Albert and Horstmann, Birger and Latz, Arnulf (2021) The Effect of External Pressure on the Dissolution of Lithium in Li-Metal Batteries. 30th Topical Meeting on Electrochemical Deposition for Semiconductor and Green Energy, 22.-24. Okt. 2021, Virtuell (geplant Taipei).

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Lithium metal is a promising anode material for batteries because of the capacity, which is much larger than that of graphite anodes. However, there are still many challenges related to deposition and dissolution of lithium, because it often forms irregular structures such as dendrites, whiskers, or porous ‘mossy’ lithium. There is experimental evidence that lithium metal batteries perform better when being cycled under pressure [1,2]. Lithium is a soft metal, that is easily deformed. Under sustained pressure, lithium is able to creep. The main creep mechanism under battery conditions is power-law creep caused by the movement of dislocations. This can be described mathematically as a strain rate ϵ ̇~(∆p)^6.6 where the exponent 6.6 has been determined experimentally [3,4], and Δp represents the difference in pressure on different surfaces. In this contribution, we study the effect of pressure on the dissolution of lithium, when discharging a lithium metal battery. We consider how creep of lithium can fill any voids that appear in the anode surface due to irregular dissolution. We propose a model system that consists of a hemispherical void on a metal surface, shown in Fig. 1. We apply an external pressure to the battery, which is transferred to the anode through the separator. In the void, the pressure is given by the electrolyte instead, which is at atmospheric pressure in common cell designs. We calculate how this difference in pressure induces a flow into the void, using a Lagrange frame model to describe the elastic and plastic deformation of lithium. [1] Louli, A.; et al., J. Electrochem. Soc., 2019, 166(8), A1291-A1299 [2] Zhang, X., et al. J. Electrochem. Soc., 2019, 166(15), A3639-A3652 [3] Masias, A.; et al., J. Mater. Sci., 2019, 54, 2585-2600 [4] LePage, W. S.; et al., J. Electrochem. Soc., 2019, 166(2), A89-A97

Item URL in elib:https://elib.dlr.de/147470/
Document Type:Conference or Workshop Item (Poster)
Title:The Effect of External Pressure on the Dissolution of Lithium in Li-Metal Batteries
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Pool, AlbertAlbert.Pool (at) dlr.dehttps://orcid.org/0000-0001-5234-9501
Horstmann, Birgerbirger.horstmann (at) dlr.dehttps://orcid.org/0000-0002-1500-0578
Latz, Arnulfarnulf.latz (at) dlr.dehttps://orcid.org/0000-0003-1449-8172
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:lithium metal battery; power-law creep; metal anode
Event Title:30th Topical Meeting on Electrochemical Deposition for Semiconductor and Green Energy
Event Location:Virtuell (geplant Taipei)
Event Type:international Conference
Event Dates:22.-24. Okt. 2021
Organizer:International Society of Electrochemistry
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 VS - Combustion Systems
DLR - Research theme (Project):E - Materials for Electrochemical Energy Storage
Location: Ulm
Institutes and Institutions:Institute of Engineering Thermodynamics > Computational Electrochemistry
Deposited By: Pool, Albert
Deposited On:23 Dec 2021 10:12
Last Modified:23 Dec 2021 10:12

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