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Title:The mechanism of Li2S activation in lithium-sulfur batteries: Can we avoid the polysulfide formation?
Authors:Vižintin, Alen (Author)
Chabanne, Laurent (Author)
Tchernychova, Elena (Author)
Arčon, Iztok (Author)
Stievano, Lorenzo (Author)
Aquilanti, Giuliana (Author)
Antonietti, Markus (Author)
Fellinger, Tim-Patric (Author)
Dominko, Robert (Author)
Files:This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Not categorized (r6)
Tipology: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
Year of publishing:2017
Number of pages:208-217
Numbering:344
COBISS_ID:4706555 Link is opened in a new window
URN:URN:SI:UNG:REP:HW5BO5OE
DOI:http://dx.doi.org/10.1016/j.jpowsour.2017.01.112 Link is opened in a new window
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Record is a part of a journal

Title:Journal of Power Sources
Publisher:Elsevier
ISSN:0378-7753
Year of publishing:2017

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