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JOURNALS // Mendeleev Communications // Archive

Mendeleev Commun., 2024 Volume 34, Issue 2, Pages 242–245 (Mi mendc96)

Communications

Low-temperature synthesis in the dittmarite–sodium acetate trihydrate system: electrochemical activity of M3+/M2+ redox couples in AMPO4 (A = Na, Li; M = Mn, Mn/Fe)

A. Sh. Samarina, T. V. Ivanovaab, E. E. Nazarova, S. N. Marshenyaa, N. D. Luchinina, E. V. Antipovac, S. S. Fedotova

a Skolkovo Institute of Science and Technology, Moscow, Russian Federation
b D.Mendeleev University of Chemical Technology of Russia, Moscow, Russian Federation
c Department of Chemistry, M.V. Lomonosov Moscow State University, Moscow, Russian Federation

Abstract: Phase-pure NaMPO4 (M = Mn, Mn/Fe; isotypic to triphylite) and Li(Mn/Fe)PO4 were isolated as a result of the low- temperature reaction between NH4MPO4·H2O (M = Mn, Mn/Fe) and AcONa·3H2O or AcOLi, respectively. Electrochemical tests in half-cells revealed that Na-based compounds exhibit poor electrochemical activity vs. metallic Na, while the similarly synthesized Li counterpart demonstrates decent cycling in Na cells. The synthetic features, crystal structures and properties of related members of the olivine family are discussed.

Keywords: topochemical reaction, olivine, triphylite, maricite, natrophilite, dittmarite, cathode material, battery, chimie douce.

Language: English

DOI: 10.1016/j.mencom.2024.02.027



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