Abstract
Homogeneous submicron carbon-coated LiFe 1− y Mn y PO 4 solid solutions in the whole concentration range (0 ≤ y ≤ 1) were obtained by mechanochemically assisted carbothermal reduction of Fe 2O 3 and MnO 2, using high-energy planetary mill. The samples were studied through a combination of several techniques: XRD, TEM, FTIR, Mössbauer, 6,7Li and 31P NMR spectroscopy and magnetic measurements. NMR study and magnetic measurements revealed the presence of tiny amounts of structural defects and ferromagnetic-like impurities with a Curie temperature above RT differing upon the sample composition. Electrochemical cycling of as prepared LiFe 1− y Mn y PO 4 showed that, despite high homogeneity and fine particles, noticeable capacity loss is observed with increased Mn content, mainly in the Mn 2+/Mn 3+ range.
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