Structure visualization and yttrium(III)-dopings on LiMn2a degree x Y x O4 for promoting structural, microstructural and cathodic capacity features of LiMnO-spinel

• Published in: Solid state sciences Vol. 13; no. 3; pp. 601 - 606
• Main Authors: Elsabawy, Khaled M, Abou-Sekkina, M M, Elmetwaly, F G
• Format: Journal Article
• Language: English
• Published: 01-03-2011
• Subjects: Discharge; Doping; Precursors; Solid state; Spinel; Thermal decomposition; Visualization; Voltammetry; Yttrium
• ISSN: 1293-2558
• DOI: 10.1016/j.solidstatesciences.2010.12.033

Samples with general formula LiMn2a degree x Y x O4 (where xaa=aa0.025, 0.05aamol) 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 xaa=aa0.05aamol in minor. The electrochemical investigations included cyclic voltammetry, charge-discharge cycling of coin model cells were performed and indicated that substituted spinel with xaa=aa0.025aamol (LiMn1.975Y0.025O4) exhibits best experimental discharge capacity. Visualization studies were also incorporated to prove crystal structure of Y-doped spinel. Display Omitted