Precursor and production method of nickel cobalt manganese lithium positive electrode material for lithium-ion batteries (II)
The production method of the nickel cobalt manganese oxide includes the following steps:
(1) Preparation of nickel cobalt manganese alloy powder
Mix metal nickel, cobalt, and manganese in a molar ratio of (1-x-y): x: y, with 0.5< δ< 1.5, 0 ≤ x<1, 0 ≤ y<1, 0<x+y ≤ 1, and then placed in a high-temperature furnace, protected by inert gas or nitrogen, heated to a temperature above the alloy melting point for melting. After melting, atomized granulation is carried out to obtain nickel cobalt manganese alloy powder;
(2) Oxidation of nickel cobalt manganese alloy powder to nickel cobalt manganese oxide
Place the nickel cobalt manganese alloy powder obtained through step (1) in an oxidation furnace with stirring ventilation, stir at a stirring speed of 50-100 r/min, introduce compressed air or oxygen, and maintain the material in dynamic state for roasting and oxidation at a temperature of 400 ℃ to 1000 ℃ (preferably 700 ℃ to 900 ℃) and an oxidation time of 0.5-10 h (preferably 1-6 h); The oxidized product is finally transferred to an airflow mill for crushing treatment, with an air consumption of 1-1.5 m3/min, an air pressure of 0.8-1 MPa, and an average particle size D50 of 5-15 μ M.
The resulting nickel cobalt manganese oxide product has a loose density of ≥ 1.8 g/cm3 and a compacted density of ≥ 2.5 g/cm3.
The lithium-ion battery is produced using a ternary material precursor production method, which directly uses nickel, cobalt, and manganese metals as raw materials, produces uniform alloy powder through high-temperature atomization, and then undergoes oxidation and lithiation by roasting with lithium compounds to maximize the density of the product; The reaction process is a solid-solid or solid-gas reaction, with no liquid phase reaction and no wastewater or exhaust gas generated, making it environmentally friendly; No need for filtration and drying, simple process, high production efficiency; It does not use expensive soluble metal salts or complex equipment systems, and has cost advantages in raw materials, equipment, and manpower compared to existing processes; Through the melting state of metals, uniform mixing of three metal atoms can be achieved; The prepared nickel cobalt manganese oxide has a high density and controllable particle size, which meets the requirements of lithium-ion battery cathode materials and is more conducive to further uniform mixing with lithium-containing compounds during subsequent processing.
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