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Experimental and Theoretical Analysis of Products and Reaction Intermediates of 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 Lithium-Sulfur Batteries. Journal of Physical Chemistry C, 23 (118). ACS Publications. DOI: 10.1021/jp5013208 ISSN 1932-7447

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp5013208

Abstract

We investigated the reduction process of sulfur during cycling in a lithium–sulfur battery, correlating the output of ultraviolet–visible (UV–vis) spectroscopy and further characterization techniques with a theoretical model. The experimental setup allows carrying out UV–vis absorption measurements under argon atmosphere. The characteristic absorption bands (λmax) of sulfur and dilithium sulfide dissolved in tetra-ethylene glycol dimethyl ether (TEGDME) are determined to be at 265 and 255 nm, respectively. Reference solutions of polysulfides diminish the λmax in the UV region with decrease of polysulfide order. The same tendency is observed in the range between 25–75% depth of discharge (DOD), caused by a progressive reduction of polysulfides in the electrolyte. At 425 and 615 nm, absorption bands are identified in the reference polysulfide solutions and also in the electrolyte at different DOD. These bands are interpreted as the characteristic bands of S42– and S3•–, and concentration changes of these species are determined semiquantitatively. The highest concentration of polysulfides is found at around 37% DOD (450 Ah·kgS–1). This was confirmed by the results of electrochemical impedance spectroscopy and computer simulations.

Item URL in elib:https://elib.dlr.de/89620/
Document Type:Article
Title:Experimental and Theoretical Analysis of Products and Reaction Intermediates of 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:21 May 2014
Journal or Publication Title:Journal of Physical Chemistry C
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:23
DOI :10.1021/jp5013208
Publisher:ACS Publications
ISSN:1932-7447
Status:Published
Keywords:sulfur, lithium sulfur batteries, UV-Vis spectroscopy
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:08 Jul 2014 15:47
Last Modified:06 Sep 2019 15:22

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