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Investigation of Magnesium-Sulfur Batteries using Electrochemical Impedance Spectroscopy

Häcker, Joachim and Danner, Christian and Zhao-Karger, Zhirong and Sievert, Brigitta / BS and Wagner, Norbert and Friedrich, K. Andreas (2018) Investigation of Magnesium-Sulfur Batteries using Electrochemical Impedance Spectroscopy. 2nd International Symposium on Magnesium Batteries, 27.-28.9.2018, Deutschland, Ulm.

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The combination of magnesium and sulfur in an electrochemical cell is a promising candidate to cope the need of high-energy batteries for future applications like electric vehicles. Due to the abundance and non-toxicity of both elements it is not only a low cost and environmentally friendly couple but also ensures safety as magnesium offers dendrite-free deposition. Theoretically, a cell voltage of 1.77 V and an energy density of 3200 Wh l-1 can be achieved. However, the Mg-S system suffers from fast capacity decay in the first cycles and poor cycle life. Nevertheless, significant research progress is gained since the first report by Kim et al. in 2011 [1], especially in the development of suitable electrolytes. Recently, Zhao-Karger et al. synthesized a chloride-free Mg(BH4)2-derived electrolyte [2] with enhanced properties in terms of electrochemical and thermal stability as well as cycling performance. Still, despite sophisticated studies the mechanisms leading to fast cell degradation are not well understood. To identify intrinsic processes electrochemical impedance spectroscopy (EIS) was applied to Mg-S cells as a function of open cell voltage (OCV), state of charge (SOC) and temperature. As the occurring reactions are difficult to be separated also symmetrical cells were examined by the means of the distribution of relaxation times (DRT). From these insights an electric equivalent circuit based on R-CPE circuits was developed in which each circuit is assigned to a specific intrinsic process. Overall, these results indicate that the magnesium electrode features surfaces layers, which cause overpotentials and limited cycle life. In addition, the retention of polysulfides in the sulfur electrode is crucial as they not only cause loss of active material but also are incorporated in forming passivating layers on the magnesium anode.

Item URL in elib:https://elib.dlr.de/122831/
Document Type:Conference or Workshop Item (Speech)
Title:Investigation of Magnesium-Sulfur Batteries using Electrochemical Impedance Spectroscopy
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Häcker, JoachimJoachim.Haecker (at) dlr.dehttps://orcid.org/0000-0003-2031-9898
Danner, Christianchristian.danner (at) dlr.deUNSPECIFIED
Zhao-Karger, Zhirongzhirong.zhao-karger (at) kit.eduhttps://orcid.org/0000-0002-7233-9818
Sievert, Brigitta / BSbrigitta.sievert (at) dlr.dehttps://orcid.org/0000-0002-0860-842X
Wagner, NorbertNorbert.Wagner (at) dlr.dehttps://orcid.org/0000-0002-2596-8689
Friedrich, K. Andreasandreas.friedrich (at) dlr.dehttps://orcid.org/0000-0002-2968-5029
Date:28 September 2018
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Magnesium-Sulfur Battery, Magnesium-Schwefel Batterie, Magnesium, Elektrochemische Impedanzspektroskopie, EIS
Event Title:2nd International Symposium on Magnesium Batteries
Event Location:Deutschland, Ulm
Event Type:international Conference
Event Dates:27.-28.9.2018
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrochemical Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Prcesses (Batteries)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Häcker, Joachim
Deposited On:19 Nov 2018 15:59
Last Modified:19 Nov 2018 15:59

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