Synthesis of Spinel LiMn2O4 with Manganese Carbonate by Controlled Crystallization Method

摘要

Micro-spherical MnCO3 particles were first and successfully synthesized by controlled crystallization method in this study. The micro-spherical particles with pure spinel LiMn2O4 were then synthesized at different temperatures using the as-prepared spherical MnCO3 and Li2CO3, at molar ratio of Li/Mn = 1.03:2. The influences of sintering temperature on the crystal structure, morphology and electrochemical performance for the LiMn2O4 materials were also characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and charge discharge test. The materials synthesized at 750 degrees C had excellent electrochemical performance as a result. Their initial discharge specific capacity was 129.2 mAh.g(-1) at 296 mA.g(-1) discharge current between 3 and 4.3 V, retaining 109 mAh.g(-1) after 100 cycles.