Abstract

Samples with general formula LiMn_2−xY_xO₄ (where x = 0.025, 0.05 mol) 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 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 mol 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 mol (LiMn_1.975Y_0.025O₄) exhibits best experimental discharge capacity. Visualization studies were also incorporated to prove crystal structure of Y-doped spinel.

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