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Zinc Electrode Shape Change in Alkaline Air Batteries: A validated 2D Model

Schmitt, Tobias and Latz, Arnulf and Horstmann, Birger (2019) Zinc Electrode Shape Change in Alkaline Air Batteries: A validated 2D Model. 16th Symposium on Modeling and Experimental Validation of Electrochemical Energy Technologies, 12.-13. Mär. 2019, Braunschweig, Deutschland.

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Abstract

Zinc-air batteries are a promising candidate for stationary energy storage. Zinc metal electrodes are stable in water relying on non-toxic materials and enabling low manufacturing costs. Current experimental research in this field deals with cycle-life limiting effects, such as anode shape change and electrolyte passivation. We contribute to this topic by performing multi-dimensional simulations. Recently, we developed a theory-based model of aqueous alkaline zinc-air batteries that consistently couples the dynamics of its solid, liquid, and gaseous phases. 1D simulations predicted the effects of inhomogeneous zinc oxide nucleation and growth as well as carbonate formation in the electrolyte. We validated the model predictions of discharge voltage and shelf-life. Here, we present the first multi-dimensional simulations of zinc-air batteries and extend our model by simulating zinc shape change. Our 2D simulations of button cells are enabled by local volumeaveraging theory. We present an implementation that deals with the numerical instabilities of a multi-component incompressibility constraint. We validate our model by in-situ tomographies of commercial button cells. To this regard, we compare the voltage profile and the phase distribution during discharge. Finally, we discuss various strategies to enhance cycle-life.

Item URL in elib:https://elib.dlr.de/127440/
Document Type:Conference or Workshop Item (Speech)
Title:Zinc Electrode Shape Change in Alkaline Air Batteries: A validated 2D Model
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schmitt, TobiasDeutsches Zentrum für Luft- und RaumfahrtUNSPECIFIED
Latz, ArnulfDeutsches Zentrum für Luft- und RaumfahrtUNSPECIFIED
Horstmann, BirgerDeutsches Zentrum für Luft- und RaumfahrtUNSPECIFIED
Date:12 March 2019
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Zinc-Air Battery Modeling & Simulation Cell Optimization
Event Title:16th Symposium on Modeling and Experimental Validation of Electrochemical Energy Technologies
Event Location:Braunschweig, Deutschland
Event Type:international Conference
Event Dates:12.-13. Mär. 2019
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)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Computational Electrochemistry
Deposited By: Schmitt, Tobias
Deposited On:12 Jul 2019 10:52
Last Modified:10 Feb 2020 12:50

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