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Insights into the Sulfur Dissolution and Anode/Electrolyte Interface in Mg-S Batteries by operando UV/Vis and Impedance Spectroscopy

Häcker, Joachim und Nguyen, Duc Hien und Rommel, Tobias und Zhao-Karger, Zhirong und Nojabaee, Maryam und Friedrich, Kaspar Andreas (2022) Insights into the Sulfur Dissolution and Anode/Electrolyte Interface in Mg-S Batteries by operando UV/Vis and Impedance Spectroscopy. International Operando Battery Days, 2022-05-16 - 2022-05-18, Grenoble, Frankreich.

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Kurzfassung

Among the various post-lithium battery systems, the magnesium-sulfur battery represents a promising candidate due to its high energy density, improved safety and abundance of the applied raw materials. The underlying mechanisms are similar to those of a lithium-sulfur cell - analogously facing the challenge of sulfur retention in the cathode to mitigate the polysulfide shuttle. However, in contrast to lithium metal, reactions at the Mg metal surface - namely the reduction of sulfur or electrolyte species - might lead to anode passivation and localized stripping/plating behavior, inducing high overpotentials and dendrite formation, respectively. To gain insights into the sulfur and polysulfide dissolution, operando UV/Vis spectroscopy and imaging were applied during OCV and cycling. Instant sulfur dissolution was observed which leads to severe self-discharge by its reduction at the magnesium anode to polysulfides (S62-/S42-). The concentration of these polysulfide species in the electrolyte is reversibly declining during cycling with a certain amount being reduced to magnesium sulfides precipitating on the anode surface. To analyze these reactions at the anode/electrolyte interface and identify the contribution of sulfur to the surface layer formation, galvanostatic electrochemical impedance spectroscopy was utilized during Mg-Mg and Mg-S cell operation. Thus, the high-ohmic adsorption layer is avoided enabling the investigation of the practical impedance response of a Mg anode during stripping and plating. To mitigate the self-discharge and active material loss, an artificial solid electrolyte interphase (SEI) was introduced and analyzed in addition to the native SEI of a bare magnesium foil to explore their contribution to the interfacial resistances.

elib-URL des Eintrags:https://elib.dlr.de/190183/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Insights into the Sulfur Dissolution and Anode/Electrolyte Interface in Mg-S Batteries by operando UV/Vis and Impedance Spectroscopy
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Häcker, JoachimJoachim.Haecker (at) dlr.dehttps://orcid.org/0000-0003-2031-9898NICHT SPEZIFIZIERT
Nguyen, Duc HienH.Nguyen (at) fkf.mpg.dehttps://orcid.org/0000-0002-3442-1159NICHT SPEZIFIZIERT
Rommel, TobiasT.Rommel (at) dlr.dehttps://orcid.org/0000-0001-8945-4444NICHT SPEZIFIZIERT
Zhao-Karger, Zhirongzhirong.zhao-karger (at) kit.eduhttps://orcid.org/0000-0002-7233-9818NICHT SPEZIFIZIERT
Nojabaee, MaryamMaryam.Nojabaee (at) dlr.dehttps://orcid.org/0000-0001-5225-3526NICHT SPEZIFIZIERT
Friedrich, Kaspar AndreasAndreas.Friedrich (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:17 Mai 2022
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Magnesium-Sulfur Battery, Magnesium-Schwefel Batterie, Operando Analysis, Electrochemical Impedance Spectroscopy, EIS, UVVis Spectroscopy, Polysulfide Shuttle, Artificial Solid Electrolyte Interface, SEI
Veranstaltungstitel:International Operando Battery Days
Veranstaltungsort:Grenoble, Frankreich
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:16 Mai 2022
Veranstaltungsende:18 Mai 2022
Veranstalter :CNRS
HGF - Forschungsbereich:Energie
HGF - Programm:Materialien und Technologien für die Energiewende
HGF - Programmthema:Elektrochemische Energiespeicherung
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SP - Energiespeicher
DLR - Teilgebiet (Projekt, Vorhaben):E - Elektrochemische Speicher, E - Elektrochemische Prozesse, E - Materialen für die elektrochemische Energiespeicherung
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Elektrochemische Energietechnik
Hinterlegt von: Häcker, Joachim
Hinterlegt am:18 Nov 2022 12:42
Letzte Änderung:24 Apr 2024 20:51

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