Preparation method of nickel-cobalt-manganese precursor with laminated and embedded stacked secondary particles

Abstract

The invention relates to the technical field of lithium ion ternary positive electrode material precursors, and discloses a preparation method of a nickel-cobalt-manganese precursor with laminated andembedded stacked secondary particles, which comprises the following steps: (1) preparing a raw material solution; (2) blending a reaction kettle base solution; (3) performing a crystal nucleus culture stage; (4) performing a crystal nucleus growth stage; (5) performing a crystal aging stage; and (6) performing washing and drying to obtain a nickel-cobalt-manganese precursor of which the chemicalformula is NixCoyMnz(OH)2, wherein x, y, z is greater than 0, and x+y+z=1. The preparation method has the following advantages and effects: nickel, cobalt and manganese are controlled to uniformly andrapidly grow by regulating and controlling process parameters, performing crystal nucleus division culture, growing, ageing and the like, so that a nickel, cobalt and manganese precursor with a sheet-shaped laminated embedded morphological structure is obtained, the tap density is high, mesoporous channels are formed between sheet layers, lithium doping is easier in the sintering process, and lithium embedding and removing in the interior are smoother; and the primary particles are orderly distributed and agglomerated, so that the stress in the secondary particles is reduced, and the structural stability in the charging and discharging process is improved.

Description

technical field [0001] The invention relates to the technical field of precursors of lithium-ion ternary positive electrode materials, in particular to a preparation method of a nickel-cobalt-manganese precursor in which secondary particles are embedded and stacked in sheet form. Background technique [0002] Lithium-ion batteries have the advantages of long cycle life and no memory effect, and have become a new generation of sustainable green power sources. They are widely used in many fields such as digital, notebook, electric vehicles, and energy storage. With the development of electric vehicles, the market demand The energy density requirements of lithium-ion batteries are getting higher and higher, and the improvement of battery energy density depends on the performance of battery materials. Nickel-cobalt lithium manganese oxide has the advantages of high energy density and good cycle performance, especially high-nickel materials in the field of power batteries. with b...

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Problems solved by technology

[0004] However, the above-mentioned prior art also has the following defects: the primary particles of the above-mentioned nickel-cobalt-lithium-manganese-oxide precursor are in a clustered "petal" structure, and the interior of the secondary particles is loose, but the overall internal structure is not smooth enough, which is not conducive to lithium intercalation and The operation of delithiation, so there is still room for improvement

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