Synthesis and Electrochemical Properties of LiyCaxNd1-xMnO3 Solid Solution |
| V.M. Kordana, O.I. Zarembaa, P.Yu. Demchenkoa, V.V. Pavlyuka, b
aFaculty of Chemistry, Ivan Franko National University of Lviv, Kyryla i Mefodiya St., 6, 79005 Lviv, Ukraine bInstitute of Chemistry, Jan Długosz University of Częstochowa, Armii Krajowej Ave, 13/15, 42200 Częstochowa, Poland |
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| New LiyCaxNd1-xMnO3 solid solutions were synthesized by electrochemical insertion of Li in the structure of the Ca-Nd-Mn-O system ceramics. The starting 1:1:3-oxides were synthesized in a solid-state reaction. The composition of the Ca0.5Nd0.5MnO3, Ca0.3Nd0.7MnO3 and Ca0.05Nd0.95MnO3 samples was confirmed by X-ray fluorescent spectroscopy and energy-dispersive X-ray spectroscopy. The obtained ceramics are characterized by orthorhombic symmetry (GdFeO3-type structure, space group Pnma, Pearson's code oP20, Z=4). Insertion of Li into the voids of oxide phase takes place during the discharge process at a potential below 3.5 V (Li-metal as an anode material and studied ceramics as cathode material). The compositions of Li-containing solid solutions are Li0.057Ca0.5Nd0.5MnO3, Li0.091Ca0.3Nd0.7MnO3 and Li0.113Ca0.05Nd0.95MnO3. The X-ray phase and structural analysis showed the formation of phases with an increased unit cell and the appearance of an amorphous halo which is a by-products of the reaction between the electrode surface and electrolyte. The scanning electron microscopy method showed the formation of Li-containing aggregates with dimensions of 1-3 μm. The small grains have a block-like shape and a diameter of <400 nm. |
DOI:10.12693/APhysPolA.141.273 topics: perovskites, solid solution, lithiation |