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Identification of the Underlying Processes in Impedance Response of Sulfur/Carbon Composite Cathodes at Different SOC

Gerle, Martina and Wagner, Norbert and Häcker, Joachim and Nojabaee, Maryam and Friedrich, Kaspar Andreas (2022) Identification of the Underlying Processes in Impedance Response of Sulfur/Carbon Composite Cathodes at Different SOC. Journal of The Electrochemical Society, 169 (3), 030505. Electrochemical Society, Inc.. doi: 10.1149/1945-7111/ac56a4. ISSN 0013-4651.

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Official URL: https://iopscience.iop.org/article/10.1149/1945-7111/ac56a4

Abstract

For lithium-sulfur batteries, porous carbon/sulfur composite cathodes are the primary solution to compensate the non-conductive nature of sulfur. The composition and structure of this class of cathodes are crucial to the electrochemical performance, achieved energy density and the stability of the cell. Electrochemical impedance spectroscopy is employed to investigate and correlate the electrochemical performance of lithium-sulfur batteries to the composition and microstructure of differently fabricated carbon/sulfur composite cathodes. A transmission line model is applied to identify different underlying electrochemical processes appearing in the impedance response of a range of porous carbon/sulfur cathodes. The integration of a lithium ring serving as a counter electrode coupled with advanced wiring has allowed an artifact-free recording of the cathode impedance at different states of charge with the aim to investigate the evolution of impedance during discharge/charge and the kinetics of charge transfer depending on the infiltration method and the utilized carbon host. It is shown that impedance response of this class of cathodes is highly diverse and the plausible underlying processes are discussed in details. To this end, quasi-solid-state and various polysulfide-based charge transfer mechanisms are identified and their time constants are reported.

Item URL in elib:https://elib.dlr.de/193061/
Document Type:Article
Title:Identification of the Underlying Processes in Impedance Response of Sulfur/Carbon Composite Cathodes at Different SOC
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Gerle, MartinaUNSPECIFIEDhttps://orcid.org/0000-0003-2492-8367UNSPECIFIED
Wagner, NorbertUNSPECIFIEDhttps://orcid.org/0000-0002-2596-8689UNSPECIFIED
Häcker, JoachimUNSPECIFIEDhttps://orcid.org/0000-0003-2031-9898UNSPECIFIED
Nojabaee, MaryamUNSPECIFIEDhttps://orcid.org/0000-0001-5225-3526UNSPECIFIED
Friedrich, Kaspar AndreasUNSPECIFIEDhttps://orcid.org/0000-0002-2968-5029UNSPECIFIED
Date:3 March 2022
Journal or Publication Title:Journal of The Electrochemical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:169
DOI:10.1149/1945-7111/ac56a4
Page Range:030505
Publisher:Electrochemical Society, Inc.
Series Name:Focus Issue on Women in Electrochemistry
ISSN:0013-4651
Status:Published
Keywords:Electrochemical impedance spectroscopy, EIS, DRT, sulfur cathode, porous electrode, Li-S battery, kinetics, relaxation time
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:12 Jan 2023 20:21
Last Modified:28 Jun 2023 14:00

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