Electrochemical Property of LiMn₂O₄Cathode Active Material Prepared by Sol-gel Method in Water

We describe the electrochemical properties of the LiMn₂O₄ prepared by sol-gel process in water. The process yields inorganic oxides with good phase purity and well controlled stoichiometry The phase pure crystalline spinel LiMn₂O₄ was prepared by calcining the appropriate precursors at 800'C for several hours. The LiMn₂O₄ prepared in the present study exhibited the single phase of spinel based on cubic. In TG-DTA analysis, unheated precursor showed the mass loss and the onset of only one distinct process at 200~400'C when heated from 100'C to 1000'C. While the LiMn₂O₄ calcination at 800'C revealed stability by 900'C without phase change. The LiMn2O4 appeared reversible redox behavior at 3.0~4.5V vs. . In the case of calcination at 800'C for 24 hour, the charge and discharge capacity was about 130mAh/g and 120mAh/g at first cycle, and after 50 cycle about 95mAh/g, 90mAh/g, respectively with cycle stability.