Preparation of Micron Co<sub>3</sub>O<sub>4</sub> by Liquid-Phase Precipitation
- 1 Northeastern University, Shenyang, China
Abstract
Co 3 O 4 powder has a wide range of applications in the fields of catalysts, magnetic materials and electrochemistry. Especially after the 1990s, the demand for lithium ion battery industry has grown tremendously. The traditional wet preparation of Co 3 O 4 powder cannot meet the requirements of the battery industry. Exploring suitable methods and theories for controlling particle size and morphology is of great significance for the preparation of battery-grade Co 3 O 4 powder. CoCl 2 was used as the cobalt source, NH 4 HCO 3 was used as the precipitant, and the precursor was prepared and further calcined to obtain Co 3 O 4 powder. The results show that the molar ratio is the main factor affecting the precursor phase in the preparation of Co 3 O 4 in CoCl 2 - NH 4 HCO 3 system. The suitable process conditions for the system are a molar ratio of NH 4 HCO 3 to CoCl 2 of 4.5:1, a concentration of CoCl 2 of 13 g/L, a reaction temperature of 60°C, and a reaction time of 10 hours. The median diameter of Co 3 O 4 prepared by the reaction conditions is about 9 μm.
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