| Title: | The mechanism of Li2S activation in lithium-sulfur batteries: Can we avoid the polysulfide formation? |
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| 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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| Files: |
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| 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. |
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| Keywords: | Lithium-sulfur batteries
Li2S active material
XAS
UV/Vis spectroscopy
Li2S activation |
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| Publication version: | Version of Record |
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| Year of publishing: | 2017 |
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| Number of pages: | 208-217 |
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| Numbering: | 344 |
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| PID: | 20.500.12556/RUNG-3003-d9de035e-f0c5-4d75-5ccb-8a76d1754d41 |
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| COBISS.SI-ID: | 4706555 |
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| DOI: | http://dx.doi.org/10.1016/j.jpowsour.2017.01.112 |
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| NUK URN: | URN:SI:UNG:REP:HW5BO5OE |
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| Publication date in RUNG: | 03.03.2017 |
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| Views: | 6010 |
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| Downloads: | 0 |
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