Please use this identifier to cite or link to this item: doi:10.22028/D291-29103
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Title: Microporous novolac-derived carbon beads/sulfur hybrid cathode for lithium-sulfur batteries
Author(s): Choudhury, Soumyadip
Krüner, Benjamin
Massuti-Ballester, Pau
Tolosa, Aura
Prehal, Christian
Grobelsek, Ingrid
Paris, Oskar
Borchardt, Lars
Presser, Volker
Language: English
Title: Journal of Power Sources
Volume: 357
Startpage: 198
Endpage: 208
Publisher/Platform: Elsevier
Year of Publication: 2017
Publikation type: Journal Article
Abstract: Novolac-derived nanoporous carbon beads were used as conductive matrix for lithium-sulfur battery cathodes. We employed a facile self-emulsifying synthesis to obtain sub-micrometer novolac-derived carbon beads with nanopores. After pyrolysis, the carbon beads showed already a specific surface area of 640 m2 g−1 which was increased to 2080 m2 g−1 after physical activation. The non-activated and the activated carbon beads represent nanoporous carbon with a medium and a high surface area, respectively. This allows us to assess the influence of the porosity on the electrochemical performance of lithium-sulfur battery cathodes. The carbon/sulfur hybrids were obtained from two different approaches of sulfur infiltration: melt-infusion of sulfur (annealing) and in situ formation of sulfur from sodium thiosulfate. The best performance (∼880 mAh gsulfur−1 at low charge rate; 5th cycle) and high performance stability (>600 mAh gsulfur−1 after 100 cycles) were found for the activated carbon beads when using melt infusion of sulfur.
DOI of the first publication: 10.1016/j.jpowsour.2017.05.005
Link to this record: hdl:20.500.11880/27944
ISSN: 1873-2755
Date of registration: 27-Sep-2019
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Materialwissenschaft und Werkstofftechnik
Professorship: NT - Prof. Dr. Volker Presser
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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