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High-entropy oxychloride increasing the stability of Li–sulfur batteries
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SYSNO ASEP 0572779 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title High-entropy oxychloride increasing the stability of Li–sulfur batteries Author(s) Zukalová, Markéta (UFCH-W) RID, SAI, ORCID
Fabián, M. (SK)
Porodko, O. (SK)
Vinarčíková, Monika (UFCH-W)
Pitňa Lásková, Barbora (UFCH-W) ORCID
Kavan, Ladislav (UFCH-W) RID, ORCIDSource Title RSC Advances. - : Royal Society of Chemistry
Roč. 13, č. 25 (2023), s. 17008-17016Number of pages 9 s. Language eng - English Country GB - United Kingdom Keywords TiO2 ; Li-sulfur batteries ; electrocatalysis ; cathode ; separator Subject RIV CG - Electrochemistry OECD category Physical chemistry R&D Projects GA20-03564S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UFCH-W - RVO:61388955 UT WOS 001002193600001 EID SCOPUS 85162815942 DOI 10.1039/D3RA01496G Annotation A novel lithiated high-entropy oxychloride Li0.5(Zn0.25Mg0.25Co0.25Cu0.25)0.5Fe2O3.5Cl0.5 (LiHEOFeCl) with spinel structure belonging to the cubic Fd[3 with combining macron]m space group is synthesized by a mechanochemical–thermal route. Cyclic voltammetry measurement of the pristine LiHEOFeCl sample confirms its excellent electrochemical stability and the initial charge capacity of 648 mA h g−1. The reduction of LiHEOFeCl starts at ca. 1.5 V vs. Li+/Li, which is outside the electrochemical window of the Li–S batteries (1.7/2.9 V). The addition of the LiHEOFeCl material to the composite of carbon with sulfur results in improved long-term electrochemical cycling stability and increased charge capacity of this cathode material in Li–S batteries. The carbon/LiHEOFeCl/sulfur cathode provides a charge capacity of 530 mA h g−1 after 100 galvanostatic cycles, which represents ca. 33% increase as compared to the charge capacity of the blank carbon/sulfur composite cathode after 100 cycles. This considerable effect of the LiHEOFeCl material is assigned to its excellent structural and electrochemical stability within the potential window of 1.7 V/2.9 V vs. Li+/Li. In this potential region, our LiHEOFeCl has no inherent electrochemical activity. Hence, it acts solely as an electrocatalyst accelerating the redox reactions of polysulfides. This can be beneficial for the performance of Li–S batteries, as evidenced by reference experiments with TiO2 (P90).
Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2024 Electronic address https://hdl.handle.net/11104/0343347
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