Preparation method of cobalt carbonate with wide particle size distribution

Abstract

The invention discloses a preparation method of cobalt carbonate with wide particle size distribution. The preparation method mainly comprises the following steps: preparing a cobalt chloride solution and an ammonium bicarbonate solution with different concentrations; synthesizing three different seed crystals through a crystallization kettle, and growing a finished product; and washing cobalt carbonate through a centrifugal machine, and directly drying wet cobalt carbonate dried through a rotary kiln. The prepared cobalt carbonate is uniform in particle size distribution, the particle size distribution coefficient reaches 0.6-0.7, sintering agglomeration is avoided, the tap density is high, and industrialization is easy.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a method for preparing cobalt carbonate with a wide particle size distribution. Background technique [0002] With the continuous development of the electronic communication field in society, the demand for lithium secondary batteries continues to increase. Battery-grade lithium cobalt oxide is the most important raw material in the 3C digital field, especially the digital products in the high-end field are currently in short supply. Many cathode material companies will study The center shifts to the large particle size spherical cobalt tetroxide with high tap density, but in order to further increase the tap density and unit capacity of the positive electrode material, a large number of cobalt tetroxide manufacturers have begun to produce mixed particles of large and small sizes to increase the tap density of the material. The method is late-stage mixing, and t...

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Problems solved by technology

[0002] With the continuous development of the electronic communication field in society, the demand for lithium secondary batteries continues to increase. Battery-grade lithium cobalt oxide is the most important raw material in the 3C digital field, especially the digital products in the high-end field are currently in short supply. Many cathode material companies will study The center shifts to the large particle size spherical cobalt tetroxide with high tap density, but in order to further increase the tap density and unit capacity of the positive electrode material, a large number of cobalt tetroxide manufacturers have begun to produce mixed particles of large and small sizes to increase the tap density of the material. The method is to mix the materials in the later stage. The requirements for large and small particle sizes of cobalt tetroxide are relatively high, and there is a problem of insufficient mixing.

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