Preparation method of spherical cobaltosic oxide

Abstract

A preparation method of spherical cobaltosic oxide includes 1) preparing cobalt salt solution and enabling cobalt content in the cobalt salt solution to be 40-180g / L, 2) preparing precipitator solution, enabling density of the precipitator solution to be 60-300g / L and enabling solution temperature to be 20-70 DEG C, 3) combining cobalt carbonate, naturally combining two strands of cobalt salt and precipitator solution flows and enabling the flows to flow into a middle reaction tank and enabling reaction temperature to be 20-70 DEG C and reaction time to be 0.5-1h; 4) conducting centrifugal washing and dehydrating; and 5) burning the mixture into a product, placing dehydrated cobalt carbonate into a burning furnace, conducting burning for 4-10h under the temperature from 400 DEG C to 900 DEG C to obtain pure-phase cobaltosic oxide. The preparation method adopts two-strand natural flow combining mode to control crystallization and burning conditions, and the prepared cobaltosic oxide is the pure-phase cobaltosic oxide. The product is spherical in microcosmic appearance, even in size distribution, controllable in size and capable of meeting requirements of markets for diversification of product size and appearance.

Description

technical field [0001] The invention relates to the technical field of lithium battery material preparation, in particular to a preparation method of spherical cobalt trioxide. Background technique [0002] Cobalt tetroxide is an important inorganic functional powder material, especially as the main material of lithium cobalt oxide, its particle size and morphology have a great influence on its performance. With the advanced technology of lithium cobalt oxide manufacturers and the diversification of product varieties, the physical and chemical properties of cobalt tetroxide are becoming more and more stringent, and more and more dense spherical cobalt tetroxide is preferred. At present, the cobalt tetroxide prepared by most manufacturers is single crystal, with wide particle size distribution and instability, which is mainly related to the control conditions of the precipitation process and calcination process. General precipitation reaction conditions are likely to cause t...

AI Technical Summary

Problems solved by technology

At present, the cobalt tetroxide prepared by most manufacturers is single crystal, with wide particle size distribution and instability, which is mainly related to the control conditions of the precipitation process and calcination process.

The general precipitation reaction conditions are likely to cause the local concentration of the reaction material solution to be too high, or the calcination temperature is too high or too low, which will lead to irregular morphology or single crystal, uneven particle size distribution, etc.

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