Cobalt carbonate and cobaltosic oxide granularity controlled production process

Abstract

The invention discloses a cobalt carbonate and cobaltosic oxide granularity controlled production process. The cobalt carbonate and cobaltosic oxide granularity controlled production process comprisesthe steps: firstly, a cobalt chloride solution and an ammonium bicarbonate solution are fed into a seed crystal reaction kettle to react under reaction conditions; feeding of cobalt chloride is increased in the later stage to obtain seed crystal cobalt carbonate; then the cobalt carbonate is distributed in a finished product reaction kettle to react, in the reaction process, the feeding quantityof the ammonium bicarbonate solution is adjusted, the alkaline environment is gradually lowered to the weak alkali environment, and the weak alkali environment is maintained; the feeding quantity of the cobalt chloride is increased every a period of time in the middle and later periods of a reaction, and finally, finished cobalt carbonate particle products with the required particle size are obtained; and cobalt carbonate particles are washed and dried, and then subjected to aerobic calcination in a rotary kiln, and cobaltosic oxide black powder is obtained. The produced cobalt carbonate particles are good in compactness and uniform in morphology and granularity, the specific surface area is adjusted according to product demands, the cobalt carbonate particles can be well controlled in therequired granularity, and calcined cobaltosic oxide is uniform in granularity, compact in particle, and also uniform in morphology.

Description

technical field [0001] The invention belongs to the field of battery materials, and relates to the production of anode materials for batteries, in particular to a particle size-controlled production process of cobalt carbonate and cobalt tetroxide. Background technique [0002] The battery material of today's mobile phones and SLR cameras is mainly lithium cobalt oxide. This battery has the advantages of stable structure, high specific capacity, and outstanding comprehensive performance. It is one of the most mature cathode materials for lithium-ion batteries in digital 3C products. [0003] However, due to the safety problems of lithium cobalt oxide itself, its application in power batteries and high-power batteries is limited. Studies have shown that the larger the secondary nucleation particle size of lithium cobalt oxide, and the uniform distribution of nucleation particle size, it can not only improve the volume energy density of the battery, but also have a higher cycl...

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of cobalt carbonate, three cobalt tetroxide particle size control production technology, solve the low production quality of cobalt carbonate, three cobalt tetroxide in the prior art, the problem of low yield

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