The production method of precursor (Ni1/3Co1/3Mn1/3) 3O4 for nickel cobalt manganese lithium positive electrode material
The production method for the precursor (Ni1/3Co1/3Mn1/3) 3O4 of nickel cobalt manganese lithium positive electrode material involves several key steps.
Firstly, the preparation of nickel cobalt manganese alloy powder is conducted by combining metal nickel, cobalt, and manganese in a molar ratio of 1:1:1. Under nitrogen protection, the mixture is heated and melted. The molten metal liquid is then atomized using high-pressure nitrogen gas flow, resulting in the formation of nickel cobalt manganese alloy powder. These particles exhibit a regular spherical shape with a loose density of 5.1 g/cm3 and a compacted density of 5.6 g/cm3. The high-temperature melting process allows for the uniform mixing of nickel, cobalt, and manganese at the atomic level, promoting the subsequent production of highly homogeneous nickel cobalt manganese oxides.
The next step involves oxidizing the nickel cobalt manganese alloy powder to obtain nickel cobalt manganese oxide. The alloy powder is placed inside an oxidation furnace equipped with stirring and ventilation. By introducing compressed air at a pressure of 0.7 MPa and maintaining dynamic conditions, the material undergoes roasting and oxidation. The oxidation process is carried out at a temperature of 900 ℃ for a duration of 3 hours. Afterward, the oxidized product is transferred to an airflow mill for crushing treatment. This step requires an air consumption of 1.5 m3/min at an air pressure of 0.8 MPa. The resulting nickel cobalt manganese oxide (Ni1/3Co1/3Mn1/3) 3O4 exhibits an average particle size (D50) of 15 μm. It possesses a loose density of 2.1 g/cm3 and a compacted density of 2.7 g/cm3. The oxide structure of the nickel cobalt manganese oxide is well-formed, and the particles exhibit a uniform spherical shape.
In summary, the production method for the precursor (Ni1/3Co1/3Mn1/3) 3O4 involves the preparation of nickel cobalt manganese alloy powder through melting and atomization processes. Subsequently, the alloy powder is oxidized at high temperature, resulting in the formation of nickel cobalt manganese oxide. This method ensures the production of highly homogeneous oxide particles with favorable characteristics for their application as positive electrode materials in nickel cobalt manganese lithium batteries.
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