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Investigating the Nucleation of Lithium Deposits in Polycrystalline Solid Electrolytes

Dippell, Jan and Danner, Timo and Hein, Simon and Latz, Arnulf (2020) Investigating the Nucleation of Lithium Deposits in Polycrystalline Solid Electrolytes. Gordon Research Conference, Ventura, USA.

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All-solid-state batteries (ASSB) are candidates for the next-generation of battery electric vehicles. They potentially enable the use of lithium metal as an anode material thereby highly improving the energy density of the battery. For traditional liquid electrolytes this has not been feasible to date due to the formation of dendritic lithium structures during battery charge. It is generally believed that the mechanical properties of the solid electrolyte stop dendrite growth and several studies using LiPON in a thin film configuration as solid electrolyte demonstrate stable cycling even for elevated current densities of up to 10 mA/cm² [1,2]. However, recently short circuits after only a few cycles under moderate current densities were reported for other polycrystalline electrolyte materials, such as LLZO [3]. Moreover, it was found that lithium does not only deposit at the anode, but also nucleates inside the bulk electrolyte [4], facilitating dendrite growth even for stable solid electrolyte –anode interfaces. The cause for these dendrites might be the higher electronic conductivity of LLZO compared to LIPON, however, this has not yet been resolved conclusively. In our contribution we explore different mechanisms for these internal lithium deposits using models and theories on the continuum scale [5,6]. In our studies we focus on the effect of grain boundaries and structural defects within the solid electrolyte. These structural features are obstacles for the flux of lithium ions and electrons and thereby affect the transient potential landscape during the charging and discharging of the ASSB. In combination with insights on the spatial distribution of lithium ions at the grain boundaries our simulations will provide indications for nucleation centers and, additionally, will allow us to analyze the stability of lithium clusters during discharge. The aim of our work is to get an understanding of the influence of material properties, manufacturing processes, and cycling conditions on the nucleation of local lithium deposits and their effect on dendrite growth. This information will give important directions for the development of future ASSBs.

Item URL in elib:https://elib.dlr.de/139591/
Document Type:Conference or Workshop Item (Poster)
Title:Investigating the Nucleation of Lithium Deposits in Polycrystalline Solid Electrolytes
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Dippell, JanJan.Dippell (at) dlr.deUNSPECIFIED
Danner, TimoTimo.Danner (at) dlr.dehttps://orcid.org/0000-0003-2336-6059
Hein, SimonSimon.Hein (at) dlr.dehttps://orcid.org/0000-0002-6728-9983
Latz, ArnulfArnulf.Latz (at) dlr.dehttps://orcid.org/0000-0003-1449-8172
Date:February 2020
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Batteries; all solid state; modeling
Event Title:Gordon Research Conference
Event Location:Ventura, USA
Event Type:international Conference
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrochemical Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Prcesses (Batteries) (old)
Location: Ulm
Institutes and Institutions:Institute of Engineering Thermodynamics > Computational Electrochemistry
Deposited By: Danner, Timo
Deposited On:16 Dec 2020 10:52
Last Modified:16 Dec 2020 10:52

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