Preparation of LiCoO2 and LiCo1-xFexO2 using hydrothermal reactions

Iron doped/undoped LiCoO2 powders could be obtained from hydrothermal react ions of either Fe3+ or Co3+ containing co-precipitates or a CoCl2-NaOH-NaCl O3 (oxidant) mixture with an excess amount of LiOH . H2O at 220 degrees C f or 8-48 h. The LiFexCo1-xC2 solid solution maintained a layered rock-salt s tructure until x = 0.25. Fe-57 Mossbauer and Co K-edge XANES spectra and ma gnetic susceptibility data reveal that iron and cobalt in the solid solutio n are in high-spin Fe3+ (S = 5/2) and low-spin Co3+ (S = 0) configurations.