Fine-sized LiCoO2 Cathode Powders Prepared from the Nano-sized Cobalt Oxide Powders Obtained by Gas Phase Reaction Method

摘要

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 pyroly-sis method.The fine-sized LiCoO2 powders had slightly aggregated morphology and narrow size distributioneven without milling process.The mean size of the LiCoO2 powders increased from 280 nm to 500 nm when thepost-treatment temperature was changed from 500°C to 800°C.On the other hand,the LiCoO2 powders preparedby 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 preparedby solid-state reaction method and the commercial product with micron size were each 151 mAh/g and 133mAh/g.The discharge capacities of the fine-sized LiCoO2 powders dropped from 151 to 135 mAh/g after 50 thcycle at a current density of 0.1 C.