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Title:The mechanism of Li2S activation in lithium-sulfur batteries: Can we avoid the polysulfide formation?
Authors:ID Vižintin, Alen, Kemijski inštitut Ljubljana (Author)
ID Chabanne, Laurent, Max Planck Institute of Colloids and Interfaces (Author)
ID Tchernychova, Elena, Kemijski inštitut Ljubljana (Author)
ID Arčon, Iztok, Univerza v Novi Gorici (Author)
ID Stievano, Lorenzo, Universite Montpellier II, (Author)
ID Aquilanti, Giuliana, Elettra-Sincrotrone Trieste (Author)
ID Antonietti, Markus, Max Planck Institute of Colloids and Interfaces (Author)
ID Fellinger, Tim-Patric, Max Planck Institute of Colloids and Interfaces (Author)
ID Dominko, Robert, Kemijski inštitut Ljubljana (Author)
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Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Electrochemical reactions in the LieS batteries are considered as a multistep reaction process with at least 2e3 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/Liþ. 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.
Keywords:Lithium-sulfur batteries Li2S active material XAS UV/Vis spectroscopy Li2S activation
Article version:Publisher's version of article
Year of publishing:2017
Number of pages:208-217
PID:20.500.12556/RUNG-3003-d9de035e-f0c5-4d75-5ccb-8a76d1754d41 New window
COBISS.SI-ID:4706555 New window
DOI: New window
Publication date in RUNG:03.03.2017
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Record is a part of a journal

Title:Journal of Power Sources
Year of publishing:2017