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  The mechanism of Li2S activation in lithium-sulfur batteries : can we avoid the polysulfide formation?

Vizintin, A., Chabanne, L., Tchernychova, E., Arčon, I., Stievano, L., Aquilanti, G., et al. (2017). The mechanism of Li2S activation in lithium-sulfur batteries: can we avoid the polysulfide formation? Journal of Power Sources, 344, 208-217. doi:10.1016/j.jpowsour.2017.01.112.

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Vizintin, Alen, Autor
Chabanne, Laurent1, Autor           
Tchernychova, Elena, Autor
Arčon, Iztok, Autor
Stievano, Lorenzo, Autor
Aquilanti, Giuliana, Autor
Antonietti, Markus2, Autor           
Fellinger, Tim-Patrick1, Autor           
Dominko, Robert, Autor
Affiliations:
1Tim Fellinger, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863322              
2Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863321              

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 Zusammenfassung: Electrochemical reactions in the Lisingle bondS batteries are considered as a multistep reaction process with at least 2–3 equilibrium states. Here we report a possibility of having a conversion of Li2S into sulfur without detectible formation of polysulfides. That was confirmed by using a novel material system consisting of carbon coated Li2S particles prepared by carbothermal reduction of Li2SO4. Two independent in operando measurements showed direct oxidation of Li2S into sulfur for this system, with almost negligible formation of polysulfides at potentials above 2.5 V vs. Li/Li+. Our results link the diversity of first charge profiles in the literature to the Li2S oxidation mechanism and show the importance of ionic wiring within the material. Furthermore, we demonstrate that the Li2S oxidation mechanism depends on the relative amount of soluble sulfur in the electrolyte. By controlling the type and the amount of electrolyte within the encapsulating carbon shell, it is thereby possible to control the reaction mechanism of Li2S activation.

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 Datum: 2017-02-042017
 Publikationsstatus: Erschienen
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 Identifikatoren: DOI: 10.1016/j.jpowsour.2017.01.112
BibTex Citekey: Vizintin2017208
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Titel: Journal of Power Sources
  Kurztitel : J. Power Sources
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Amsterdam, The Netherlands : Elsevier
Seiten: - Band / Heft: 344 Artikelnummer: - Start- / Endseite: 208 - 217 Identifikator: ISSN: 0378-7753