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Single step tranformation of sulphur to Li₂S₂/Li₂S in Li-S batteries

Helen, M.; Reddy, M.A.; Diemant, T.; Golla-Schindler, U.; Behm, R.J.; Kaiser, U.; Fichtner, M.

Lithium-sulphur batteries have generated tremendous research interest due to their high theoretical energy density and potential cost-effectiveness. The commercial realization of Li-S batteries is still hampered by reduced cycle life associated with the formation of electrolyte soluble higher-order polysulphide (Li2Sx, x = 4–8) intermediates, leading to capacity fading, self-discharge, and a multistep voltage profile. Herein, we have realized a practical approach towards a direct transformation of sulphur to Li2S2/Li2S in lithium-sulphur batteries by alteration of the reaction pathway. A coconut shell derived ultramicroporous carbon-sulphur composite cathode has been used as reaction directing template for the sulphur. The lithiation/delithiation and capacity fading mechanism of microporous carbon confined sulphur composite was revealed by analyzing the subsurface using X-ray photoelectron spectroscopy. No higher-order polysulphides were detected in the electrolyte, on the surface, and in the subsurface of the cathode composite. The altered reaction pathway is reflected by a single-step profile in the discharge/charge of a lithium-sulphur cell.

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Verlagsausgabe §
DOI: 10.5445/IR/110102361
Veröffentlicht am 22.11.2018
DOI: 10.1038/srep12146
Zitationen: 100
Web of Science
Zitationen: 103
Zitationen: 97
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2015
Sprache Englisch
Identifikator ISSN: 2045-2322
KITopen-ID: 110102361
HGF-Programm 37.01.13 (POF III, LK 01) Conversion and Alloying
Erschienen in Scientific reports
Verlag Nature Research
Band 5
Seiten 12146/1-12
Nachgewiesen in Dimensions
Web of Science
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