Synthesis And Characterization Of LiMn₂O₄ As Catho De Materials For Lithium Ion Batteries

The spinel LiMn₂O₄ is promising to be cathodes for Li-ion battery, due to its relatively high energy density and low toxicity. However, the capacity of spinel LiMn₂O₄ fades rapidly in the charge-discharge cycle process. It has been suggested that the capacity fading is due to Jahn-Teller distortion , dissolution of manganese into the electrolyte and decomposition of the electrolyte. Therefore how to improve the function of the spinel LiMn₂O₄ having become the hot spot studying.In this dissertation, two methods are adopted to prepare the spinel manganic acid lithium. One is combustion method, the other is drying emulsion. And four kinds of factors including the sinter temperature , sinter time, different proportion of raw material and the amount of doped ions were discussed for the function of the pinel LiMn₂O₄. The structure of the material were charactered by the X-ray apparatus, and both two material made by different methods are proved to be spinel LiMn₂O₄. The material were found to be granular on the shape appearance by SEM, and the diameter of the particle were homogeneous. The electricity circulation function were measured by making the material as the anode of the battery. The best preparation condition of the material was ascertained, and outstanding LiMn₂O₄ of anode material were made successfully. The spinel LiMn₂O₄ was a kind of li-ion battery cathode material, and this study was a basis for the modification about the spinel LiMn₂O₄.