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Narrow Range of Y+++-Dopings on LiMn2-xYxO4 for Promoting Structural, Microstructural and Cathodic Capacity Features of LiMnO-Spinel

M. M. Abou-Sekkina, Khaled M. Elsabawy and F. G. Elmetwaly

Samples with general formula LiMn2-xYxO4 ( where x= 0.025,0.05 mole ) were successfully synthesized through thermal decomposition of LiMnC2O4 (OAc) precursor, whereas LiMnC2O4 (OAc) precursor was synthesized by the room temperature solid state reaction.The structural , micro-structural and electrochemical features of pure spinel and yttrium doped samples were investigated .XRD-analysis indicated that all of the prepared samples are mainly belong to cubic crystal form with Fd3m space group .Only Y2O3 begins to appear as secondary impurity phase with maximum doping ratio x = 0.05 mole in minor . The electrochemical investigations included cyclic voltammetry, charge–discharge cycling of coin model cells were performed and indicated that substituted spinel with x = 0.025 mole (LiMn1.975Y0.025O4) exhibits experimental discharge capacity equal to 128 mAhg-1 which is better than that recorded for undoped spinel LiMn2O4 (126 mAhg-1) .A visualization studies were also incorporated to prove crystal structure of Y-doped-spinel.