Preparation method of ternary nickel cobalt manganese anode material precursor capable of changing stacking mode of microcrystalline particle

A technology of particle accumulation and positive electrode material is applied in the field of preparation of ternary nickel-cobalt-manganese positive electrode material precursor, which can solve the problems of complicated operation, difficult to meet the existing production and high cost, and achieve high battery capacity, low cost, and guaranteed products. quality effect

Active Publication Date: 2019-03-15

HUAYOU NEW ENERGY TECH (QUZHOU) CO LTD +1

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AI-Extracted Technical Summary

Problems solved by technology

[0007] The above method is complex in operation and high in cost, will introduce unn...

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Abstract

The invention belongs to the technical field of preparation of anode materials for lithium ion batteries, and particularly relates to a preparation method of a ternary nickel cobalt manganese anode material precursor. The preparation method aims at overcoming the defect of the prior art, and provides the preparation method of the ternary nickel cobalt manganese anode material precursor capable ofchanging the stacking mode of a microcrystalline particle, the precursor prepared according to the method has a regularly arranged ordered structure, and a special inner structure of arranging outwards radially from the center of the particle is formed. A paddle structure of a reaction kettle is mainly improved, the local mixing effect is improved by regulating the form, the diameter, and the number of layers of paddles of the reaction kettle, the number of paddles on each layer, and the distance between the layers, the axial circulating and radial shearing capabilities are strengthened, the degree of supersaturation of the local area is reduced, the microcrystalline is arranged directionally, so that the structure stability of the material is improved, the diffusion rate of the lithium ion is increased, the mixed arrangement of the cation is reduced, and the rate capability and the cycling stability of the anode material are better.

Application Domain

Cell electrodesSecondary cells +1

Technology Topic

Lithium electrodeLithium-ion battery +11

Image

Examples

Experimental program(1)
Comparison scheme(2)

Example Embodiment

[0024] Example 1

[0025] (1) The concentration of nickel, cobalt and manganese metal salt solution is 2mol/L, the concentration of ammonia water is 8-10%, and the concentration of lye is 4mol/L of sodium hydroxide solution; the chemical formula of the nickel, cobalt and manganese precursor is Ni (1-xy)CoxMny(OH)2, where 0.1≤x≤0.2, 0.1≤y≤0.3;

[0026] (2) Improve the structure of the reactor blade: the reactor blade adopts an open turbine 45° oblique blade blade; the diameter of the adjustment blade is 0.5D, and D is the diameter of the reactor; the number of blades is double-layered, and each layer of blades The number of blades is 6; adjust the pitch of the blade layer, the vertical distance between the lower blade and the discharge port at the bottom of the reactor is 0.15L, L is the effective height of the reactor, that is, the horizontal center line of the overflow port of the reactor to the bottom discharge port The vertical distance between the lower blade and the upper blade is 0.5L, and the vertical distance between the upper blade and the horizontal center line of the overflow is 0.35L; add pure water to the sealed reactor until the upper layer is submerged and stirred, And pass in protective gas for 1-2h;

[0027] (3) Add the solution prepared in step (1) into the reactor at the same time, turn on the stirring, and control the flow rate of the solution into the reactor. The reaction temperature is 40-70℃, the pH value is 10.0-12.0, and the ammonia concentration is 6.0-7.0g/L. , The stirring speed is 200-210rpm, until the particle size reaches the target value of 9.0-10.0μm;

[0028] (4) The overflowed slurry was washed with 2% sodium hydroxide solution for 120 minutes, and then rinsed with sufficient pure water for 3 times; the washed nickel, cobalt, manganese hydroxide was dried and iron removed to obtain The microcrystalline particles are precursors that are stacked in an orderly manner in the form of emission. The SEM of the external and internal structure of the nickel-cobalt-manganese precursor particles is as figure 2 Shown.

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