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Correlation of Capacity Fading Processes and Electrochemical Impedance Spectra in Lithium/Sulfur Cells

Risse, Sebastian and Cañas, Natalia Andrea and Wagner, Norbert and Härk, Eneli and Ballauff, M. and Friedrich, Andreas K. (2016) Correlation of Capacity Fading Processes and Electrochemical Impedance Spectra in Lithium/Sulfur Cells. Journal of Power Sources, 323. Elsevier. DOI: dx.doi.org/10.1016/j.jpowsour.2016.05.032 ISSN 0378-7753

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The capacity fading of lithium/sulfur (Li/S) cells is one major challenge that has to be overcome for a successful commercialization of this electrochemical storage system. Therefore it is essential to detect the major fading mechanisms for further improvements of this system. In this work, the processes leading to fading are analyzed in terms of a linear four state model and correlated to the distribution of relaxation times calculated with a modified Levenberg-Marquardt algorithm. Additionally, the Warburg impedance and the solution resistance are also obtained by the same algorithm. The detailed analysis of intermediate states during the first cycle gives the distinction between relaxation processes at the sulfur cathode and at the lithium anode. The influence of the polysulfides on the impedance parameters was evaluated using symmetric cells; this yields a good correlation with the results obtained from the first discharge/charge experiment. A fast and a slow capacity fading process are observed for the charge and the discharge during 50 cycles. The fast fading process can be assigned to Faradaic reactions at the lithium anode.

Item URL in elib:https://elib.dlr.de/104390/
Document Type:Article
Title:Correlation of Capacity Fading Processes and Electrochemical Impedance Spectra in Lithium/Sulfur Cells
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Risse, Sebastiansebastian.risse (at) helmholtz-berlin.deUNSPECIFIED
Cañas, Natalia Andreanatalia.canas (at) dlr.deUNSPECIFIED
Wagner, Norbertnorbert.wagner (at) dlr.deUNSPECIFIED
Härk, Enelieneli.haerk (at) helmholtz-berlin.deUNSPECIFIED
Ballauff, M.HZ BerlinUNSPECIFIED
Friedrich, Andreas K.andreas.friedrich (at) dlr.deUNSPECIFIED
Journal or Publication Title:Journal of Power Sources
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :dx.doi.org/10.1016/j.jpowsour.2016.05.032
Keywords:lithium sulfur battery, capacity fading, electrochemical impedance spectroscopy, Levenberg-Marquardt algorithm, distribution of relaxation time
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrochemical Energy Storage
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (Batteries) (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Wagner, Dr.rer.nat. Norbert
Deposited On:22 Nov 2016 08:49
Last Modified:31 Jul 2019 20:01

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