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Insight into Sulfur Confined in Ultramicroporous Carbon

Helen, M.; Diemant, Thomas; Schindler, Stefan; Behm, R. Jürgen; Danzer, Michael; Kaiser, Ute; Fichtner, Maximilian; Anji Reddy, M.

Abstract:
Here, we provide a deeper insight into the state of sulfur confined in ultramicroporous carbon (UMC) and clarify its electrochemical reaction mechanism with lithium by corroborating the results obtained using various experimental techniques, such as X-ray photoelectron spectroscopy, electron energy loss spectroscopy, in situ Raman spectroscopy, and in situ electrochemical impedance spectroscopy. In combination, these results indicate that sulfur in UMC exists as linear polymeric sulfur rather than smaller allotropes. The electrochemical reactivity of lithium with sulfur confined in UMC (pore size ≤0.7 nm) is different from that of sulfur confined in microporous carbon (≤2 nm, or ultramicroporous carbon containing significant amount of micropores) and mesoporous carbon (>2 nm). The observed quasi-solid-state reaction of lithium with sulfur in UMC with a single voltage plateau during the discharge/charge process is due to the effective separation of solvent molecules from the active material. The size of carbon pores plays a vital role in determining the reaction path of lithium with sulfur confined in UMC.

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Verlagsausgabe §
DOI: 10.5445/IR/1000085858
Veröffentlicht am 18.09.2018
Seitenaufrufe: 47
seit 19.09.2018
Downloads: 89
seit 19.09.2018
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 2470-1343, 2470-1343
urn:nbn:de:swb:90-858588
KITopen-ID: 1000085858
HGF-Programm 37.01.03 (POF III, LK 01)
Erschienen in ACS omega
Band 3
Heft 9
Seiten 11290–11299
Vorab online veröffentlicht am 17.09.2018
Nachgewiesen in Scopus
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