Method for preparing nickel-cobalt-manganese ternary precursor material by fractional reaction

Abstract

The invention discloses a method for preparing a nickel-cobalt-manganese ternary precursor material by fractional reaction. The method comprises the following steps: preparing nickel sulfate, cobalt sulfate and manganese sulfate into a mixed solution, adding in a primary reaction kettle, then adding a mixed solution of a sodium hydroxide solution and an ammonia water solution, controlling the temperature to be 45-65 DEG C, reacting for 8-20 hours under the condition that the stirring speed is 50-500 rpm and adopting an upper port of the primary reaction kettle for natural overflow and discharge; performing solid-liquid separation on the overflowed and discharged feed liquid, drying and screening a solid and slurrying small particles with a respective particle size of 7 mum to obtain slurry; conveying the obtained slurry into a secondary reaction kettle for reaction. The method disclosed by the invention has the benefits that the waste small particles in the precursor production processare recycled, so that the utilization rate of raw materials is improved, and the production cost is reduced; the mass percentage content of the precursor material with a particle size of less than 7mum is below 3 percent; the nickel-cobalt-manganese ternary precursor material produced by the method is high in tap density, so that the performances of a subsequent battery and other products are better.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a method for preparing a nickel-cobalt-manganese ternary precursor material. Background technique [0002] With the development of society, the requirements for environmental friendliness and sustainable development of materials are getting higher and higher. As a new type of green secondary battery, lithium-ion batteries have been widely used. The main components of lithium-ion batteries are positive electrode, negative electrode, electrolyte and separator. At present, the positive electrode materials of commercialized lithium-ion batteries mainly include lithium iron phosphate, lithium cobalt oxide and nickel-cobalt lithium manganate ternary materials. Although the lithium iron phosphate material has the advantages of high safety factor, good thermal conductivity and good cycle performance, it has disadvantages such as low capacity and poor...

AI Technical Summary

Problems solved by technology

Although this method solves the problem of ternary cathode precursor material waste, it increases the difficulty of controlling the reactor, reduces production capacity, and is not suitable for industrial production.