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Mesoporous hollow carbon spheres for lithium-sulfur batteries : distribution of sulfur and electrochemical performance

Juhl, Anika C.; Schneider, Artur 1,2; Ufer, Boris; Brezesinski, Torsten 1,2; Janek, Juergen 1,2; Froeba, Michael
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)
2 Center for Electrochemical Energy Storage Ulm & Karlsruhe (CELEST), Karlsruher Institut für Technologie (KIT)

Abstract:
Hollow carbon spheres (HCS) with a nanoporous shell are promising for the use in lithium–sulfur batteries because of the large internal void offering space for sulfur and polysulfide storage and confinement. However, there is an ongoing discussion whether the cavity is accessible for sulfur. Yet no valid proof of cavity filling has been presented, mostly due to application of unsuitable high-vacuum methods for the analysis of sulfur distribution. Here we describe the distribution of sulfur in hollow carbon spheres by powder X-ray diffraction and Raman spectroscopy along with results from scanning electron microscopy and nitrogen physisorption. The results of these methods lead to the conclusion that the cavity is not accessible for sulfur infiltration. Nevertheless, HCS/sulfur composite cathodes with areal sulfur loadings of 2.0 mg·cm$^{-2}$ were investigated electrochemically, showing stable cycling performance with specific capacities of about 500 mAh·g$^{-1}$ based on the mass of sulfur over 500 cycles.


Volltext §
DOI: 10.5445/IR/1000060431
Originalveröffentlichung
DOI: 10.3762/bjnano.7.114
Scopus
Zitationen: 27
Web of Science
Zitationen: 25
Dimensions
Zitationen: 28
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 2190-4286
urn:nbn:de:swb:90-604311
KITopen-ID: 1000060431
HGF-Programm 37.01.01 (POF III, LK 01) Fundamentals and Materials
Erschienen in Beilstein journal of nanotechnology
Verlag Beilstein-Institut
Band 7
Seiten 1229-1240
Schlagwörter carbon/sulfur composites, cycling stability, distribution of sulfur in pores, hollow carbon spheres, lithium–sulfur batteries
Nachgewiesen in Dimensions
Web of Science
Scopus
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