Preparation method of low-sulfur small-particle-size nickel-cobalt-manganese hydroxide

Abstract

The invention belongs to the technical field of synthesis of lithium ion battery ternary anode material precursors, and particularly relates to a preparation method of a nickel-cobalt-manganese hydroxide. The method comprises the following steps: preparing a small-particle-size nickel-cobalt-manganese hydroxide by a nucleation / crystallization isolation method: introducing a nickel-cobalt-manganese mixed metal solution, sodium hydroxide and ammonia water under the condition of a high pH value at the same time for nucleation, adding a certain amount of additive at the end of nucleation to help a crystal nucleus to be dispersed rapidly, and entering a crystal nucleus growing stage to obtain a spherical particular nickel-cobalt-manganese hydroxide with D50 being equal to 2 to 3 mum, high dispersity and high degree of sphericity; controlling the washing condition, so that the sulfur content of the nickel-cobalt-manganese hydroxide is as low as 1,500ppm. The method has the advantages of easiness and convenience in operation, high flexibility, no need of modifying a reaction kettle, easiness for expanded production and the like.

Description

technical field

[0001] The invention belongs to the technical field of synthesis of precursors of ternary cathode materials for lithium ion batteries, and in particular relates to a preparation method of nickel-cobalt-manganese hydroxide. Background technique

[0002] As a new type of green power source, lithium-ion batteries have been widely used in 3C digital electronic products, power tools, electric vehicles, energy storage and other fields. One of the key factors determining the electrochemical performance of lithium-ion batteries is the cathode material. Several positive electrode materials commonly used at present include lithium manganese oxide, lithium cobalt oxide, lithium iron phosphate, and nickel-cobalt lithium manganese oxide. Among them, lithium nickel cobalt manganese oxide has excellent comprehensive performance in terms of energy density, discharge voltage, cycle performance, thermal stability, self-discharge, cost, etc., and has gradually become the mains...

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