Characterization of nanoparticles of LiMn2O4 synthesized by citric acid sol-gel method

Nanoparticles of Lithium manganese oxide (LiMn2O4) spinel oxides have been synthesized from aqueous solutions of metal acetate containing citric acid as a chelating agent by a sol-gel method. The influence of calcination temp erature on the physicochemical properties of LiMn2O4 powders in air atmosph ere has been analyzed by means of X-ray diffraction (XRD) and electron micr oscopic techniques. The thermal behavior of the material has been examined by thermogravimetry (TG) and differential thermal analysis (DTA). Two sharp and well-defined peaks obtained from cyclic voltammetry of Li/1 M LiPF6-EC /DEC electrolyte/LiMn2O4 cell reveal that the LiMn2O4 particles are highly crystalline and insertion-extraction mechanism occur at two stages in the 4 V region. (C) 2001 Elsevier Science B.V. All rights reserved.