Preparation method of cobalt carbonate for battery

Abstract

The invention discloses a preparation method of cobalt carbonate for a battery. The preparation method comprises the following steps of: firstly adding an ammonium bicarbonate solution as a base solution; then adding a cobalt liquid for the neutralization precipitation reaction again; adding the ammonium bicarbonate solution and the cobalt liquid at the same time to a reaction system by adopting a simultaneous feeding mode till the pH of the reaction system is 6-7; moreover, keeping the pH of the whole system to be stabled to be 6-8 in the feeding process; also monitoring the dimension of cobalt carbonate particles; stopping feeding when D50 in the average particle size distribution index of cobalt carbonate reaches the stipulated requirement, thus the whole neutralization precipitation reaction is finished; and filtering and drying discharged materials after the reaction products in a reaction tank is subjected to heat preservation and aging continuously, thereby obtaining the required cobalt carbonate. The preparation method provided by the invention is simple and has low cost, two stage matching of the neutralization precipitation reaction is reasonable, the appropriate matched parameters are optimized, thereby preparing and obtaining the similar-spherical cobalt carbonate with great apparent density and uniform and controllable particle size.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to battery material technology, in particular to a method for preparing cobalt carbonate for batteries. Background technique [0002] With the progress of society, the development speed of science and technology is gradually accelerating, and the arrival of the information age is driving the continuous updating of electronic products. As the energy device of portable electronic equipment, the demand for secondary batteries is increasing. Lithium cobaltate is the leading material for the positive electrode, and the quality of the precursor of lithium cobaltate (cobalt carbonate) determines the performance of the battery material. [0003] Conventional cobalt carbonate production all adopts reverse addition method, that is, adding cobalt liquid to ammonium bicarbonate solution for neutralization and precipitation, and controlling the particle size distribution and Loose specif...

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Problems solved by technology

[0004] However, in this neutralization and precipitation process, due to the continuous progress of precipitation, the acidity of the system is constantly changing; in addition, the ammonium bicarbonate as the bottom liquid is also constantly consumed along with the precipitation, and the volume of the system is constantly increasing. Therefore, the physical properties of cobalt carbonate produced cannot guarantee the consistency before and after, and the particle size distribution is wide, the particle size is uneven, and the shape is not uniform. irregular

In the end, the performance of the positive electrode material of the battery is different, which affects the consistency of the battery product

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