A low temperature barium-based ceramic oxide battery materials for high voltage lithium secondary cells

LiCo1-xBaxO2(x=0.0 ,0.1, 0.2, 0.3 and 0.5) has been prepared by a low temperature solid-state reaction procedure and evaluated. It is used as the positive material for lithium-ion battery applications. Bare and doped samples were characterized by chemical analysis, X-ray diffraction, Transmission Electron Microscope, Scanning Electron Microscope and Energy-Dispersive X-ray Spectroscopic Analysis. Electrochemical characterization of these samples has been studied following cyclic voltammetry and galvanostatic charge-discharge cycling in between the potential range of 3.0-4.5 V. Specific capacity of the compound with x = 0.2 has been found to be about 164 mAh(-1). With an increase in x, the capacity C p decreases and reaches to 121 mAhg(-1) at x = 0.5. From cyclic voltammograms, it has been found that the peak potential separation is minimum for the sample with x = 0.2, which supports the charge-discharge data. (c) 2007 Elsevier BN. All rights reserved.