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Formation of spinel structured compounds in the lithium permanganate thermal decomposition

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Abstract

Products of thermal decomposition of lithium permanganate LiMnO4·3H2O, which are formed in temperature range 160–900 °C, have been characterized by powder XRD and chemical analysis. It has been found that the decomposition of the permanganate results in the formation of an equimolar mixture of manganate(IV) Li2MnO3 and stoichiometric spinel LiMn2O4 at the temperatures above 700 °C. Intermediate products with spinel structure are formed at lower temperatures with oxidation number of manganese being between +4 and +3.5. These compounds can be related to overstoichiometric spinel phases with general formula Li a [Mn(1 + 0.5a)Li(1 − 0.5a)]O4, where a > 1. Electrochemical properties of these intermediates with regard to the reaction of Li extraction were investigated. The data are of interest for the development of synthesis methods for mixed oxides containing lithium and manganese with lithium permanganate as the lithiating reagent.

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Acknowledgments

This work was supported in part by Ministry of Science and Education of Ukraine, project #2991F, and Spanish MICINN (MAT2010-15094 and MAT2006-01997).

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Authors and Affiliations

  1. Chair of General and Inorganic Chemistry, Chemical Technology Faculty, National Technical University of Ukraine “KPI”, Prospekt Peremogy 37, 03056, Kyiv, Ukraine

    Alexander A. Andriiko, Arseniy Ye. Shpak & Nataliya Ye. Vlasenko

  2. CEST—Centre of Electrochemical Surface Technology, Viktor Kaplan-Strasse 2, 2700, Wiener Neustadt, Austria

    Yuriy O. Andriyko

  3. Departamento de Química Orgánica e Inorgánica, Universidad de Oviedo—CINN, 33006, Oviedo, Spain

    José R. García & Sergei A. Khainakov

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  1. Alexander A. Andriiko
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  2. Arseniy Ye. Shpak
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  3. Yuriy O. Andriyko
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  4. José R. García
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  5. Sergei A. Khainakov
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  6. Nataliya Ye. Vlasenko
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Correspondence to Alexander A. Andriiko.

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Andriiko, A.A., Shpak, A.Y., Andriyko, Y.O. et al. Formation of spinel structured compounds in the lithium permanganate thermal decomposition. J Solid State Electrochem 16, 1993–1998 (2012). https://doi.org/10.1007/s10008-011-1603-5

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  • DOI: https://doi.org/10.1007/s10008-011-1603-5

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