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The Influence of Composition and Microstructure of the Cathode on the Impedance Response in Lithium-Sulfur Batteries

Gerle, Martina and Moschner, Robin and Michalowski, Peter and Friedrich, Kaspar Andreas and Nojabaee, Maryam (2023) The Influence of Composition and Microstructure of the Cathode on the Impedance Response in Lithium-Sulfur Batteries. 10th Workshop Lithium-Sulfur Batteries, 03.-04.07.2023, Dresden, Deutschland.

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Lithium-sulfur batteries represent one of the most promising candidates for next-generation batteries due to their high specific energy density. Nonetheless, this battery chemistry is also facing obstacles such as the polysulfide-shuttle effect and the insulative nature of sulfur. In attempt to counteract these undesirable effects, several cathode-focused approaches were examined in the scientific community, including the infiltration and confinement of the active material in a conductive carbon host material or utilizing covalently bound sulfur within a polymeric backbone. However, these concepts also alter the known redox-mechanisms of lithium-sulfur cell chemistry as polysulfide dissolution is suppressed. In this work, various cathode systems including sulfur-carbon composite and sulfurized polyacrylonitrile (SPAN) are studied comprehensively by means of electrochemical impedance spectroscopy. Symmetrical two- or three-electrode cell arrangement is employed in order to analyze cathodic mechanisms without anode-induced or asymmetry artifacts. Transmission line models characteristic of porous electrodes have been implemented to understand the contribution of the different processes to the impedance of these cathodes. The influence of parameters such as microstructure of these cathodes, in particular porosity, on the impedance response is discussed in detail. Moreover, the investigation of impedance evolution upon various states of charge allows the identification of the highly diverse underlying processes related to the cathode, specifically a range of charge transfer mechanisms including quasi-solid-state and polysulfide-based redox reactions.

Item URL in elib:https://elib.dlr.de/197134/
Document Type:Conference or Workshop Item (Poster)
Title:The Influence of Composition and Microstructure of the Cathode on the Impedance Response in Lithium-Sulfur Batteries
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Moschner, RobinBattery LabFactory BraunschweigUNSPECIFIEDUNSPECIFIED
Michalowski, PeterBattery LabFactory BraunschweigUNSPECIFIEDUNSPECIFIED
Date:3 July 2023
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:impedance, lithium-sulfur, battery, kinetics, EIS, redox-mechanism, SPAN, symmetrical, cathode, transmission line model, TLM, quasi-solid-state, polysulfide
Event Title:10th Workshop Lithium-Sulfur Batteries
Event Location:Dresden, Deutschland
Event Type:Workshop
Event Dates:03.-04.07.2023
Organizer:Fraunhofer Institute for Material and Beam Technology IWS
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: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Gerle, Martina
Deposited On:22 Sep 2023 12:28
Last Modified:22 Sep 2023 12:28

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