A novel high entropy spinel-type aluminate MAl2O4 (M = Zn, Mg, Cu, Co) and its lithiated oxyfluoride and oxychloride derivatives prepared by one-step mechanosynthesis

0546963 - ÚFCH JH 2023 RIV DE eng J - Journal Article
Porodko, O. - Fabián, M. - Kolev, H. - Lisnichuk, M. - Zukalová, Markéta - Vinarčíková, Monika - Girman, V. - da Silva, K.L. - Šepelák, V.
A novel high entropy spinel-type aluminate MAl2O4 (M = Zn, Mg, Cu, Co) and its lithiated oxyfluoride and oxychloride derivatives prepared by one-step mechanosynthesis.
Zeitschrift für Physikalische Chemie : International Journal of Research in Physical Chemistry & Chemical Physics. Roč. 236, 6-8 (2022), s. 713-726. ISSN 0942-9352
R&D Projects: GA ČR(CZ) GA20-03564S
Institutional support: RVO:61388955
Keywords : high-entropy spine * lithiation * mechanosynthesis
OECD category: Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
Impact factor: 2.5, year: 2022
Method of publishing: Open access with time embargo

For the first time, a spinel-type high entropy oxide (Zn0.25Cu0.25Mg0.25Co0.25)Al2O4 as well as its derivative lithiated high entropy oxyfluoride Li0.5(Zn0.25Cu0.25Mg0.25Co0.25)0.5Al2O3.5F0.5 and oxychloride Li0.5(Zn0.25Cu0.25Mg0.25Co0.25)0.5Al2O3.5Cl0.5 are prepared in the nanostructured state via high-energy co-milling of the simple oxide precursors and the halides (LiF or LiCl) as sources of lithium, fluorine and chlorine. Their nanostructure is investigated by XRD, HR-TEM, EDX and XPS spectroscopy. It is revealed that incorporation of lithium into the structure of spinel oxide together with the anionic substitution has significant effect on its short-range order, size and morphology of crystallites as well as on its oxidation/reduction processes. The charge capacity of the as-prepared nanomaterials tested by cyclic voltammetry is found to be rather poor despite lithiation of the samples in comparison to previously reported spinel-type high entropy oxides. Nevertheless, the present work offers the alternative one-step mechanochemical route to novel classes of high entropy oxides as well as to lithiated oxyfluorides and oxychlorides with the possibility to vary their cationic and anionic elemental composition.
Permanent Link: http://hdl.handle.net/11104/0323338