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TiO2 top layer improving the performance of sulfur/carbon composite cathode in Li-sulfur cells

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    SYSNO ASEP0566054
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleTiO2 top layer improving the performance of sulfur/carbon composite cathode in Li-sulfur cells
    Author(s) Zukalová, Markéta (UFCH-W) RID, SAI, ORCID
    Vinarčíková, Monika (UFCH-W)
    Pitňa Lásková, Barbora (UFCH-W) ORCID
    Kavan, Ladislav (UFCH-W) RID, ORCID
    Article number127246
    Source TitleMaterials Chemistry and Physics. - : Elsevier - ISSN 0254-0584
    Roč. 296, FEB 2023 (2023)
    Number of pages8 s.
    Languageeng - English
    CountryCH - Switzerland
    Keywordsbattery ; porous carbon ; cyclic voltammetry ; TiO2 ; Li-sulfur
    Subject RIVCG - Electrochemistry
    OECD categoryElectrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
    R&D ProjectsGA20-03564S GA ČR - Czech Science Foundation (CSF)
    Method of publishingLimited access
    Institutional supportUFCH-W - RVO:61388955
    UT WOS000910716800001
    EID SCOPUS85145581476
    DOI10.1016/j.matchemphys.2022.127246
    AnnotationFacile preparation of the TiO2 top layer on the sulfur/carbon cathode in a Li-sulfur battery is presented. The layer significantly improves the initial charge capacity of composite cathodes. To demonstrate the versatility of the TiO2 top layer, its effect is evaluated on the sulfur composite cathodes with three kinds of carbonaceous additives. The electrochemical performance of these sulfur composite cathodes in the Li-sulfur battery is studied by cyclic voltammetry, galvanostatic chronopotentiometry, and electrochemical impedance spectroscopy. The sulfur/composite cathode with TOB carbon provides the highest charge capacity of 816 mAh g−1 from cyclic voltammetry, however, due to its structural disorder, exhibits the most pronounced capacity fade during galvanostatic cycling at 0.1C rate. The graphene nanoplatelets/sulfur composite cathode provides a charging capacity of 739 mAh g−1 in cyclic voltammetry and excellent cycling stability over 100 cycles of galvanostatic charging/discharging. A TiO2 top layer on the cathode and a TiO2-modified separator increase substantially the initial charge capacities of sulfur composite cathodes with all three kinds of carbon. The voltammetric charge capacities are 1427 mAh g−1, 1349 mAh g−1, and 952 mAh g−1 for TOB carbon, graphene nanoplatelets, and Penta carbon, respectively. This represents the relative enhancement by 75%, 83%, and 44%, respectively, as referenced to the cells with titania-free materials. Galvanostatic chronopotentiometry confirms the beneficial effect of inorganic additive on the charge capacity of Penta carbon and graphene nanoplatelets, however, the long-term cycling stability of the composite electrode is determined exclusively by the carbonaceous additive.
    WorkplaceJ. Heyrovsky Institute of Physical Chemistry
    ContactMichaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196
    Year of Publishing2024
    Electronic addresshttps://hdl.handle.net/11104/0337494
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