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For the first time, a spinel-type high entropy oxide (Zn 0.25 Cu 0.25 Mg 0.25 Co 0.25 )Al 2 O 4  as well as its derivative lithiated high entropy oxyfluoride Li 0.5 (Zn 0.25 Cu 0.25 Mg 0.25 Co 0.25 ) 0.5 Al 2 O 3.5 F 0.5  and oxychloride Li 0.5 (Zn 0.25 Cu 0.25 Mg 0.25 Co 0.25 ) 0.5 Al 2 O 3.5 Cl 0.5  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.

zeitschrift für physikalische chemie

A novel high entropy spinel-type aluminate MAl 2 O 4  (M = Zn, Mg, Cu, Co) and its lithiated oxyfluoride and oxychloride derivatives prepared by one-step mechanosynthesis