Preparation method of nickel-rich precursor material that can prevent particle breakage

Abstract

The invention discloses a method for preparing a nickel-rich precursor material capable of preventing particle breakage, comprising the following steps: preparing reaction slurry and setting the target particle size D of the precursor 50 = d; during the preparation reaction, by monitoring the real-time particle size D of the reactant 50 , denoted as d 1 ; when the measured d 1 When the value of d is significantly smaller than the value of d, the particle size distribution Span value of the generated reactant is lowered by changing the process conditions. When the measured d is subsequently monitored 1 When the value is near the d value, change the process conditions again to increase the Span value of the particle size distribution of the reactant so that the Span value can be controlled within a certain range; while maintaining the control range of the Span value, continue the subsequent preparation reaction until the generated reaction The particle size of the material grows up to the d value, and then the subsequent processing is carried out to obtain the nickel-rich precursor material. The invention can prepare nickel-rich precursor materials with different particle sizes, high sphericity and no particle breakage.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a preparation method of a positive electrode precursor material. Background technique [0002] Lithium-ion batteries have many advantages such as long cycle life, high safety, and no memory effect, and are widely used in various mobile communication devices and electric vehicles. keep improve. Commercially available cathode materials for lithium batteries include lithium cobalt oxide, lithium manganate, lithium iron phosphate and lithium nickel cobalt manganate. In recent years, with the rapid development of the field of electric vehicles, higher requirements have been placed on the energy density of lithium-ion batteries. Compared with other cathode materials, nickel cobalt lithium manganate has the advantage of high capacity per gram, and its application in the field of electric vehicles gradually gained popularity. Due to the different rati...

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Problems solved by technology

[0004] Nickel-cobalt-manganese hydroxide is generally prepared by co-precipitation method, using nickel salt, cobalt salt, manganese salt, hydroxide, and ammonia water to form spherical nickel-cobalt-manganese hydroxide under a certain reaction system, but with the increase of nickel content Improvement, nickel-cobalt-manganese hydroxide is prone to particle breakage and low tap density, resulting in disadvantages such as poor cycle performance and poor stability of high-nickel materials

In the prior art CN105118981A, when preparing a high-nickel precursor, a high-low speed method is used to control the cracking of high-nickel precursor particles. However, when the method is controlled at a low speed, the medium-sized particles are prone to agglomeration, and the large particles are bulging, which affects the precursor. The sphericity of the body, and this phenomenon will be particularly obvious when preparing a large particle size high-nickel precursor. Although the particle breakage problem of the high-nickel precursor is solved on the basis of sacrificing the sphericity of the large particle, the sphericity is poor. It is not conducive to the secondary treatment of sintered products, so there are still great limitations

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