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First steps towards a model of Mg-S batteries

Richter, Raphael und Lück, Jessica und Danner, Timo und Latz, Arnulf (2016) First steps towards a model of Mg-S batteries. 1st International Symposium on Magnesium Batteries, 2016-07-21 - 2016-07-22, Blaubeuren, Deutschland.

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Kurzfassung

The use of alkaline/alkaline earth metal as anode material, such as Li, Na, Mg, or Zn offers many benefits compared to conventional intercalation chemistry based battery technologies. Lithium-sulfur batteries are one of most investigated systems of that type. In recent years magnesium-sulfur batteries are highly discussed as a next-generation energy storage system. Magnesium can be directly used as anode material due to its dendrite-free deposition and thus increases the safety as well as energy density of such a cell. Two electrons are stored per Mg atom which compensates the rather low discharge potential of magnesium-sulfur cells of 1.7 V and provides a high capacity of 3832 mAh/cm3 and 2230 mAh/g [1]. The system offers a theoretical energy density of over 3200 Wh/l, which is beyond that of lithium-sulfur batteries and is therefore very promising for automotive and stationary applications [2]. Furthermore magnesium and sulfur are both naturally abundant, low in price and non-toxic. However, magnesium-sulfur batteries are in a very early stage of research and development. The first proof of concept was reported by Kim et al. in 2011. Critical issues of this first cell were a short lifetime of only two cycles and an initial discharge potential of only 1 V indicating side reactions [3]. A new electrolyte recently developed by Zhao-Karger et al. pushed the system to the next level and a cell with a lifetime of more than 50 cycles and a discharge potential near the theoretical value was demonstrated. However, analogous to lithium-sulfur batteries magnesium-sulfur batteries show polarization effects during charging, low cyclic stability, initial capacity fading, and a polysulfide shuttle. The reaction mechanism is proposed analogous to those of lithium-sulfur batteries but is still not investigated in detail. To the best of our knowledge there are no continuum models of magnesium-sulfur batteries in the literature. Therefore, we present the first step towards a mechanistic model of magnesium-sulfur cells. Our aim is to provide more insight in the operation of Mg-S batteries and to support the experimental progress. We use a continuum model based on porous electrode and dilute solutions theory. The transport of dissolved species is described by the Nernst-Planck equation where transport occurs via diffusion and migration. Our kinetic model includes a reduced reaction mechanism from our previous work on Li-S cells which was able to reproduce the key experimental results [4]. In this work we additionally take into account adsorption and desolvation effects [5] which are expected to be prominent for Mg cations. In close collaboration with experimentalists we aim at guiding new developments of the Mg-S system.

elib-URL des Eintrags:https://elib.dlr.de/108996/
Dokumentart:Konferenzbeitrag (Poster)
Titel:First steps towards a model of Mg-S batteries
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Richter, RaphaelRaphael.Richter (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Lück, Jessicajessica.lueck (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Danner, Timotimo.danner (at) dlr.dehttps://orcid.org/0000-0003-2336-6059NICHT SPEZIFIZIERT
Latz, Arnulfarnulf.latz (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2016
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Mg-S Magnesium Schwefel
Veranstaltungstitel:1st International Symposium on Magnesium Batteries
Veranstaltungsort:Blaubeuren, Deutschland
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:21 Juli 2016
Veranstaltungsende:22 Juli 2016
Veranstalter :Helmholtz-Institute Ulm
HGF - Forschungsbereich:Energie
HGF - Programm:Speicher und vernetzte Infrastrukturen
HGF - Programmthema:Elektrochemische Energiespeicher
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E EV - Energieverfahrenstechnik
DLR - Teilgebiet (Projekt, Vorhaben):E - Elektrochemische Prozesse (Batterien) (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Computergestützte Elektrochemie
Hinterlegt von: Richter, Raphael
Hinterlegt am:06 Dez 2016 11:20
Letzte Änderung:24 Apr 2024 20:14

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