Abstract
Fine-sized LiCoO2 powders were prepared by solid-state reaction method using nano-sized Co3O4 powders. Nano-sized Co3O4 powders with regular morphology and narrow size distribution were obtained by spray pyrolysis method. The fine-sized LiCoO2 powders had slightly aggregated morphology and narrow size distribution even without milling process. The mean size of the LiCoO2 powders increased from 280 nm to 500 nm when the post-treatment temperature was changed from 500°C to 800°C. On the other hand, the LiCoO2 powders prepared by conventional spray pyrolysis method at preparation conditions of high production rate had irregular morphology and broad size distribution. The initial discharge capacities of the fine-sized LiCoO2 powders prepared by solid-state reaction method and the commercial product with micron size were each 151 mAh/g and 133 mAh/g. The discharge capacities of the fine-sized LiCoO2 powders dropped from 151 to 135 mAh/g after 50 th cycle at a current density of 0.1 C.
