Preparation of LiMn₂O₄ Microstructure by Low Temperature Solid-State Reaction for Cathode Material

Abstract

This study aims at investigating a better condition of calcination at different temperature to produce LiMn2O4 microstructure. In this study, cubic LiMn2O4 was synthesized using a low temperature solid-state reaction. We report, here, MnO2 nanorods synthesis by reflux and their chemical conversion to LiMn2O4. The compound was characterized by XRD and TEM. Further, the analysis of LiMn2O4 microstructure was carried out by Direct Method using winPLOTR package program and Diamond using XRD data. At low calcination temperature, Mn2O3 is present as an impurity, but it disappears along with the increase in calcination temperature. It is also found that solid state reaction at is 750oC give nanoLiMn2O4. The lattice parameters and cell volumes of LiMn2O4 increases with the increase in heating temperature.

Synthesis of LiCo_xMn_2-xO₄ by Low Temperature Solid-State Reaction for Cathode Material

“…Meanwhile Mn 3+ and/or Mn 4+ and Co 3+ ions are located at the octahedral centers (16d) and O 2ions are located at the edge (32e). The expected LiCo x Mn 2-x O 4 structure is in accordance with that of the pure LiMn 2 O 4 reported in earlier work [7]. No clear difference was observed among the XRD patterns of LiCo x Mn 2-x O 4 with various doping compositions.…”

Physico-Chemical Properties of LiM0.10Mn1.90O4 (M: Co, Ni, Cr) for Potential Cathode Materials

“…In a typical synthesis, Mn(CH3COO)2 and Na2S2O8 were dissolved at room temperature with a molar ratio of 1:1 in 80 mL deionized distilled water by magnetic stirring to form a clear homogeneous solution. The mixed solution was transferred into boiling flask and heated at 120 °C for 12 h. The obtained powder was subsequently dried at 110 °C for 12 h in air [19].…”

“…In a typical synthesis, Mn(CH3COO)2 and Na2S2O8 were dissolved at room temperature with a molar ratio of 1:1 in 80 mL deionized distilled water by magnetic stirring to form a clear homogeneous solution. The mixed solution was transferred into boiling flask and heated at 120 °C for 12 h. The obtained powder was subsequently dried at 110 °C for 12 h in air [19].A typical synthesis of LiM0.10M1.90O4 is as the following. 1 mole of LiOH, 0.10 moles of Co(CH3COO)2 and 1.90 mol of as-synthesized MnO2 were dispersed into high purity ethanol to form a thick slurry, stirred to form fine mixture for several hours and dried at room temperature.…”