Preparation and Electrochemical Properties of Cathode Materials Li_(1+x)Mn_2O_4 for Lithium-Ion Batteries

The end products were synthesized with the starting reactors lithium acetate and man- ganese acetate (in different mole ratio) dissolved in de-ionic water to form homogeneous solutions, which were evaporated by heating to form solid state mixtures precursors. The calcination of the precursors in air produces uniformly sized, fine particles of spinel Li1+xMn2O4 as the final active materials. Prepared from starting reactors lithium acetate and manganese acetate in Li:Mn=1.1:2 and under 850°C, the resultant materials have better electrochemical characterizations. The re- action mechanism was investigated by TGA and IR spectroscopy. The investigation of the XRD patterns, the analysis of the morphology and the determination of the electrochemica1 properties show the resultant particles are fine, narrowly distributed, well crystallized and honeycomb-like. The charge-discharge data indicate that the resultant material with spinel structure has an initial capacity of 128 mAh/g and a good cycling performance.