Optimized Synthesis of LiMn_2O_4 Cathode Materials for Li-ion Batteries

The synthesis kinetic parameters of spinel LiMn2O4 produced in air were studied by the non-isothermal multiple scanning method with DSC at the four heating rates. An optimal solid-state synthesis method was then obtained based on the above investigations. It employed the two-step method to prepare the spinel-phased LiMn2O4: firstly, the well-mixed raw materials preheated at 600℃ for several hours and subsequently, raised the temperature to 830℃ and fired at this temperature for a longer time to get the final products. The microstructures of the final LiMn2O4 samples were investigated by X-ray diffraction. The electrochemical properties of LiMn2O4 as the cathode materials of Li-ion batteries were measured by the constant current charge-discharge method: an initial capacity of 122mAh/g and relatively high capacity retention were obtained.