Effect of Further Calcination on the Phase Structure of LiMn2O4 Prepared by a Solution Combustion Synthesis

Gui Yang Liu; Jun Ming Guo; Bao Sen Wang; Ying He

doi:10.4028/www.scientific.net/AMM.66-68.768

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 66-68Effect of Further Calcination on the Phase...

Effect of Further Calcination on the Phase Structure of LiMn₂O₄ Prepared by a Solution Combustion Synthesis

Abstract:

In this paper, LiMn2O₄ materials were prepared by a solution combustion synthesis method using acetate salts as raw materials and acetic acid as fuel. The effect of further calcination at 500°C and 600°C on the phase structure and composition were investigated. The composition and phase structure are determined by X-ray diffraction (XRD). XRD results indicated that the main phase of the products was LiMn2O₄,and there was a trace amount Mn₂O₃ impurity in the products prepared at 500°C and 600°C. The impurity Mn₂O₃ in the products prepared at 500°C is increased with increasing calcination time, but the Mn₂O₃ in the products prepared at 600°C is decreased. The grain sizes of the products prepared at 500°C and 600°C are increased with increasing calcination time, and the grain sizes of the products prepared at 600°C are larger than these of the products prepared at 500°C. The lattice parameters of the products prepared at 500°C and 600°C are smaller than that of LiMn₂O₄ with perfect crystal, and the lattice parameters of the products are more close to that of LiMn₂O₄ with perfect crystal.