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Highly microporous carbon aerogel as sulfur host in lithium-sulfur batteries

Schettler, Jessica und Schwan, Marina und Nojabaee, Maryam und Wagner, Norbert und Milow, Barbara (2020) Highly microporous carbon aerogel as sulfur host in lithium-sulfur batteries. Online Aerogel Seminar 2020, 2020-09-16 - 2020-09-18, Hamburg, Deutschland.

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Kurzfassung

Lithium-sulfur (Li-S) batteries are currently one of the promising systems among next generation batteries due to their high theoretical specific capacity and high specific energy density. However, the commercialization of Li-S batteries is left challenged by the capacity loss induced by the polysulfide shuttle effect. Encapsulation of active material in the cathode matrix is one of the many strategies inhibiting the polysulfide shuttle effect[1]. Carbon Aerogels (CA), first introduced by Richard Pekala in 1989[2], are highly promising materials to be used as cathode matrix encapsulating sulfur. Starting from organic resorcinol-formaldehyde (RF) aerogels, CA exhibits highly porous structure with huge porosity up to 97 %, high surface area about 500-2000 m²/g, large micropore volume about 0.1-0.6 cm³/g and sufficient electrical conductivity[3-4]. In addition, the crucial advantage of CA is its adjustable porous structure and pore size distribution. The microstructure can be tuned during synthesis and carbonization of organic aerogels. Furthermore, the flexibility of CA enables the elimination of the crack formation during volume change of sulfur. In the present study, we synthesized and investigated highly microporous CA as conductive matrix embedding sulfur for cathodes in Li-S batteries[5]. The improved carbonization process leads to an increase in micropore volume. Thus, the amount of active material sulfur in micropores is maximized. The innovative gas phase sulfur infiltration of the CA traps short sulfur chains in the microspores (< 2 nm). Complementary characterization techniques such as TGA and XPS are used for demonstration. It is shown that sulfur infiltrated microporous CA cathodes are able to suppress the polysulfide shuttle effect, leading to a higher cycle stability of the cell in both ether and carbonate based electrolytes. Moreover, the influence of the structural and physical properties of different CAs, including density and pore size, on the electrochemical performance of the cell is discussed.

elib-URL des Eintrags:https://elib.dlr.de/136263/
Dokumentart:Konferenzbeitrag (Poster)
Titel:Highly microporous carbon aerogel as sulfur host in lithium-sulfur batteries
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Schettler, JessicaJessica.Schettler (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Schwan, MarinaMarina.Schwan (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Nojabaee, MaryamMaryam.Nojabaee (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wagner, NorbertNorbert.Wagner (at) dlr.dehttps://orcid.org/0000-0002-2596-8689NICHT SPEZIFIZIERT
Milow, BarbaraBarbara.Milow (at) dlr.dehttps://orcid.org/0000-0002-6350-7728NICHT SPEZIFIZIERT
Datum:16 September 2020
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Carbon Aerogel, Lithium Sulfur Battery, Shuttle Effect
Veranstaltungstitel:Online Aerogel Seminar 2020
Veranstaltungsort:Hamburg, Deutschland
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:16 September 2020
Veranstaltungsende:18 September 2020
Veranstalter :Hamburg University of Technology
HGF - Forschungsbereich:Energie
HGF - Programm:Energieeffizienz, Materialien und Ressourcen
HGF - Programmthema:Methoden und Konzepte für Materialentwicklung
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E VS - Verbrennungssysteme
DLR - Teilgebiet (Projekt, Vorhaben):E - Materialien für die Energietechnik (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Aerogele und Aerogelverbundwerkstoffe
Hinterlegt von: Kröner, Jessica
Hinterlegt am:19 Okt 2020 10:10
Letzte Änderung:24 Apr 2024 20:38

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