The production method of the precursor (Ni0.5Co0.2Mn0.3)O0.8 for nickel cobalt lithium manganese oxide cathode material (III)
The production method of the precursor (Ni0.5Co0.2Mn0.3)O0.8 for nickel cobalt lithium manganese oxide cathode material involves the following steps:
Step 1: Preparation of nickel cobalt manganese alloy powder.
First, mix nickel, cobalt, and manganese metals in a molar ratio of 5:2:3. This mixture is heated and melted under nitrogen protection to form a molten metal liquid. The molten metal liquid is then atomized using a high-pressure nitrogen gas flow at a pressure of 3 MPa and a flow rate of 4 kg/min. As a result, the atomized metal powder solidifies, settles, and ultimately collects in a powder collection tank, resulting in the formation of nickel cobalt manganese alloy powder.
The nickel cobalt manganese alloy powder particles exhibit a regular spherical shape, with a loose density of 5.0 g/cm3 and a compacted density of 5.3 g/cm3. The high-temperature melting process ensures the uniform mixing of the alloy powder at the atomic level. This uniform mixture is crucial for the subsequent preparation of highly homogeneous nickel cobalt manganese oxides.
Step 2: Oxidation of nickel cobalt manganese alloy powder to nickel cobalt manganese oxide.
Take the nickel cobalt manganese alloy powder obtained from step 1 and place it in an oxidation furnace equipped with stirring and ventilation. Stir the mixture at a speed of 80 r/min and introduce compressed air at a pressure of 0.7 MPa. Maintain a dynamic state for roasting and oxidation. The oxidation process is carried out at a temperature of 400 ℃ for a duration of 10 hours. Once oxidized, transfer the product to an airflow mill for crushing treatment. This process requires an air consumption of 1.3 m3/min and an air pressure of 1 MPa.
The resulting nickel cobalt manganese oxide, denoted as (Ni0.5Co0.2Mn0.3)O0.8, has an average particle size (D50) of 5μm. Its loose density measures 1.8 g/cm3, while the compacted density is 2.5 g/cm3.
The production method of the precursor (Ni0.5Co0.2Mn0.3)O0.8 for nickel cobalt lithium manganese oxide cathode material involves the preparation of nickel cobalt manganese alloy powder followed by its oxidation to obtain the desired oxide product. These steps ensure the formation of a highly homogeneous material with specific particle sizes suitable for use as a cathode in various applications.
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