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Experimental and Theoretical Analysis of Products and Reaction Intermediates of Discharge Process in Lithium-Sulfur Batteries

Cañas, Natalia A. and Fronczek, David Norman and Wagner, Norbert and Latz, Arnulf and Friedrich, K. Andreas (2014) Experimental and Theoretical Analysis of Products and Reaction Intermediates of Discharge Process in Lithium-Sulfur Batteries. 65th Annual Meeting of the International Society of Electrochemistry, 31. Aug. -5. Sept. 2014, Lausanne, Schweiz.

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Abstract

The identification and quantification of species involved in the electrochemical reactions of lithium-sulfur batteries are still unclear and controversial aspects of the investigation of these cells. However, a deeper understanding of the system is crucial to improve the capacity and cycling stability of the cell. In this work, the reduction process of sulfur in a lithium-sulfur battery was studied using UV-Vis spectroscopy under argon atmosphere [1]. Absorbance maxima of dissolved sulfur and polysulfide species were determined at various concentrations. Reference solutions of polysulfides reduce the λmax in the UV-region with decrease of polysulfide order. This tendency is also observed between 25–75% depth of discharge due to the progressive reduction of polysulfides in the electrolyte. Because the application of UV-Vis spectroscopy alone does not provide a complete overview of the distribution of all species during cycling, we present a comparison between the output of a physicochemical model [4] with experimental data obtained from UV-Vis spectroscopy [1], X-ray diffraction [2] and electrochemical impedance spectroscopy [3]. The model affirms that the highest concentration of polysulfide is observed when all sulfur has been dissolved. In the tested cells, this occurs at around 37% DOD (450 Ah∙kgS−1). A significant concentration of polysulfides is confirmed at the end of discharge which is of significant importance for improving the cycling stability of lithium-sulfur cells.

Item URL in elib:https://elib.dlr.de/90594/
Document Type:Conference or Workshop Item (Poster)
Title:Experimental and Theoretical Analysis of Products and Reaction Intermediates of Discharge Process in Lithium-Sulfur Batteries
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Cañas, Natalia A.natalia.canas (at) dlr.deUNSPECIFIED
Fronczek, David Normandavid.fronczek (at) dlr.deUNSPECIFIED
Wagner, Norbertnorbert.wagner (at) dlr.deUNSPECIFIED
Latz, Arnulfarnulf.latz (at) dlr.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:3 September 2014
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Lithiu sulfur, Uv-Vis, Batterien, Characterization, simulations
Event Title:65th Annual Meeting of the International Society of Electrochemistry
Event Location:Lausanne, Schweiz
Event Type:international Conference
Event Dates:31. Aug. -5. Sept. 2014
Organizer:ISE
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Fuel Cells (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Cañas, Natalia Andrea
Deposited On:17 Dec 2014 17:35
Last Modified:31 Jul 2019 19:47

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