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Wetting Behavior of Aprotic Li–Air Battery Electrolytes

Kube, Alexander and Bienen, Fabian and Wagner, Norbert and Friedrich, Kaspar Andreas (2022) Wetting Behavior of Aprotic Li–Air Battery Electrolytes. Advanced Materials Interfaces. Wiley. doi: 10.1002/admi.202101569. ISSN 2196-7350.

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Official URL: https://onlinelibrary.wiley.com/doi/full/10.1002/admi.202101569

Abstract

The open architecture of cathodes in Li–air batteries implies the need for open porosity with adequate pore size distribution and surface energy optimization with regard to the electrolyte. The interaction of liquid and cathode material, especially the wetting properties, which depend on cathode material, roughness and porosity, and electrolyte properties, needs to be understood properly to avoid flooding and assure high active areas. In this work, contact angle goniometry, capillary rise method, and pressure saturation curves are used to investigate the wetting properties of dimethyl sulfoxide (DMSO), tetraethylene glycol dimethyl ether (Tetraglyme), a 1:1 mixture of ethylene carbonate and dimethyl carbonate (EC:DMC) and water on a gas diffusion layer (GDL) Sigracet 39BC, and a pure flat polytetrafluorethylene (PTFE) foil. Contact angle measurement shows that all three organic solvents wet the GDL hydrophobic agent PTFE. Capillary rise measurements show that all sample liquids slowly imbibe into the porous network. While for Tetraglyme an efficient penetration is limited by the high viscosity, water flow rate is slowed down by the hydrophobic pore network of the GDL. Pressure saturation curves for DMSO, Tetraglyme, and EC:DMC can be obtained for the first time and are compared with the water pressure saturation curve.

Item URL in elib:https://elib.dlr.de/148426/
Document Type:Article
Title:Wetting Behavior of Aprotic Li–Air Battery Electrolytes
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Kube, AlexanderUNSPECIFIEDhttps://orcid.org/0000-0002-8042-326XUNSPECIFIED
Bienen, FabianUNSPECIFIEDhttps://orcid.org/0000-0002-4660-8826UNSPECIFIED
Wagner, NorbertUNSPECIFIEDhttps://orcid.org/0000-0002-2596-8689UNSPECIFIED
Friedrich, Kaspar AndreasUNSPECIFIEDhttps://orcid.org/0000-0002-2968-5029UNSPECIFIED
Date:2022
Journal or Publication Title:Advanced Materials Interfaces
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.1002/admi.202101569
Publisher:Wiley
ISSN:2196-7350
Status:Published
Keywords:contact angle, Li–air battery, organic solvents ,pressure saturation curves, wettability
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Chemical Energy Carriers
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Processes
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Kube, Alexander
Deposited On:11 Mar 2022 10:00
Last Modified:12 Jan 2023 20:29

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