Synthesis of LiMn₂O₄ for cathode material and its cycling stability

Based on the analysis results of thermogravimetry-differential scanning calorimetry for the Li₂CO₃/MnO₂ mixture powder, the activation energy during each reaction period was calculated by the Ozawa method. LiMn₂O₄ cathode materials were synthesized at different preheating treatment temperatures, and characterized by X-ray diffraction and scanning electron microscopy, and the electrochemical properties of the synthesized materials were determined. The optimum synthesis conditions are a preheating temperature of 600°C and a synthesis temperature of 830°C for 12 h. The LiMn₂O₄ powder synthesized under the optimal conditions has a spinel structure and good morphology. The initial capacity of the LiMn₂O₄ cathode materials is 122 (mA·h)/g with a relatively high capacity for retention 96% after 20 cycles at room temperature.