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Lithium-Sulfur Batteries: New insights and developments

Friedrich, K. Andreas and Cañas, Natalia Andrea and Wagner, Norbert and Pascucci, Brigitta (2014) Lithium-Sulfur Batteries: New insights and developments. World of Energy Solutions / battery storage, 06. -08. Okt. 2014, Messe Stuttgart, Deutschland.

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The identification and quantification of species involved in the electrochemical reactions of lithium-sulfur (Li-S) 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 Li-S battery was studied using UV-Vis spectroscopy under argon atmosphere. 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 insight intoof the distribution of all species during cycling, we present a comparison between the output of a physicochemical model with experimental data obtained from UV-Vis spectroscopy and other characterization methods. 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 Li-S cells.

Item URL in elib:https://elib.dlr.de/92121/
Document Type:Conference or Workshop Item (Speech)
Title:Lithium-Sulfur Batteries: New insights and developments
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Cañas, Natalia Andreanatalia.canas (at) dlr.deUNSPECIFIED
Wagner, Norbertnorbert.wagner (at) dlr.deUNSPECIFIED
Pascucci, BrigittaBrigitta.Pascucci (at) dlr.deUNSPECIFIED
Date:8 October 2014
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Lithium sulfur, 4th generation, batteries
Event Title:World of Energy Solutions / battery storage
Event Location:Messe Stuttgart, Deutschland
Event Type:international Conference
Event Dates:06. -08. Okt. 2014
Organizer:Region Stuttgart
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: Friedrich, Prof.Dr. Kaspar Andreas
Deposited On:19 Nov 2014 15:40
Last Modified:19 Nov 2014 15:40

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