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Preparation method of ternary precursor fine crystal nucleus

A precursor and fine technology, applied in chemical instruments and methods, electrical components, inorganic chemistry, etc., can solve the problems of low tap density, low particle tap density, high production cost, and achieve good sphericity and high density. , the effect of improving the density

Active Publication Date: 2018-10-26
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three elements of nickel, cobalt and manganese obtained by this process cannot be evenly distributed, and the particle size is uneven, the particle shape is poor, and the tap density is low.
Although the gel-sol method can obtain hydroxide precipitation with uniform distribution of nickel, cobalt and manganese, the particle shape is still poor, the tap density is low, and the production cost is high
In the prior art, when preparing nickel-cobalt-manganese hydroxide, the crystal nucleus is prepared first, and then the reaction solution is added to make the crystal nucleus grow outward gradually by adjusting pH, ammonia concentration and other conditions to generate nickel-cobalt-manganese-hydrogen with a larger particle size. Oxide, however, in the prior art, there is no fine process control in the process of crystal nucleus preparation, so that there are cavities inside the prepared crystal nucleus, the shape of the particles is uneven, the interior of the particles is loose, and the tap density is low

Method used

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  • Preparation method of ternary precursor fine crystal nucleus
  • Preparation method of ternary precursor fine crystal nucleus
  • Preparation method of ternary precursor fine crystal nucleus

Examples

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Effect test

Embodiment 1

[0031] A preparation method of a ternary precursor with narrow distribution of different particle sizes:

[0032] (1) Ni, Co and Mn are prepared in a molar ratio of 1:1:1 to prepare a mixed aqueous solution of nickel-cobalt-manganese soluble salts with a total concentration of 2.0mol / L, and to prepare an aqueous sodium hydroxide solution with a concentration of 8mol / L. The preparation concentration is the ammonia solution of 10mol / L;

[0033] (2) Adding ammonia concentration in the first reactor with temperature control water bath jacket, stirring paddle and precision filter tube is 0.15mol / L, pH is the first mother liquor of 11.78, and the first mother liquor is used as bottom water, Make the first mother liquor not pass through all the stirring paddles of the first reactor, the addition of the first mother liquor accounts for 1 / 3 of the total volume of the first reactor, the volume of the first reactor is 6500L, adding the bottom water earlier can make the first reactor Bef...

Embodiment 2

[0053] A preparation method of a ternary precursor with narrow distribution of different particle sizes:

[0054] (1) Ni, Co and Mn are prepared in a molar ratio of 1:1:1 to prepare a mixed aqueous solution of nickel-cobalt-manganese soluble salts with a total concentration of 2.5mol / L, and to prepare an aqueous sodium hydroxide solution with a concentration of 10mol / L. The preparation concentration is the ammonia solution of 10mol / L;

[0055] (2) in the first reactor that has temperature control water bath jacket, stirring paddle and precision filter tube, adding ammonia concentration is 0.25mol / L, and pH is the first mother liquor of 11.55, and the first mother liquor is used as bottom water, Make the first mother liquor not pass through all the stirring paddles of the reactor, the addition of the first mother liquor accounts for 2 / 3 of the total volume of the first reactor, and the volume of the first reactor is 6500L;

[0056] (3) Feed nitrogen into the sealed first react...

Embodiment 3

[0073] A preparation method of a ternary precursor with narrow distribution of different particle sizes:

[0074] (1) Ni, Co and Mn are prepared in a molar ratio of 1:1:1 to prepare a mixed aqueous solution of nickel-cobalt-manganese soluble salts with a total concentration of 2.3mol / L, and to prepare an aqueous sodium hydroxide solution with a concentration of 10mol / L. The preparation concentration is the ammonia solution of 8mol / L;

[0075] (2) Adding ammonia concentration in the first reactor with temperature control water bath jacket, stirring paddle and precision filter tube is 0.2mol / L, pH is the first mother liquor of 11.5, and the first mother liquor is used as bottom water, Make the first mother liquor not pass through all the stirring paddles of the reactor, the addition of the first mother liquor accounts for 1 / 2 of the total volume of the first reactor, and the volume of the first reactor is 6500L;

[0076] (3) Feed nitrogen into the sealed first reaction kettle, ...

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Abstract

The invention discloses a preparation method of ternary precursor fine crystal nucleus, characterized by comprising the steps of S1, preparing nickel-cobalt-manganese soluble salt solution of certainconcentration, an alkaline solution and ammonia solution; S2, adding a mother liquor, which is composed of the ammonia solution and the alkaline solution, into a reactor, introducing nitrogen into thereactor, starting stirring, and adjusting pH of the mother liquor during stirring; S3, concurrently adding the nickel-cobalt-manganese soluble salt solution into the reactor, and allowing gradual reaction in the reactor to generate ternary precursor fine crystal nucleus. The preparation method has the advantages that the nucleating process is precisely controlled, the ternary precursor fine crystal nucleus of high compactness and good sphericity is prepared, and possible problems, such as cavitation, to the prepared nucleus are avoided.

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 fine crystal nuclei of ternary precursors. Background technique [0002] As a new type of green secondary battery, lithium-ion power battery has the advantages of high working voltage, small size, light weight, high energy, and relatively low toxicity. It has been widely used in mobile phones, notebook computers, small video cameras, digital cameras, etc. In portable electronic equipment, and expand space to the fields of electric vehicles, satellites and aerospace. Cathode material is an important factor restricting the development of lithium-ion batteries in the direction of high energy and high density, but its cost is relatively high. Ternary materials are considered to be one of the most promising cathode materials due to their high energy density, relatively low cost, and excellent cycle performance. [0003] In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 徐剑晖吕小梅刘鹏张云飞李朝林
Owner DONGGUAN UNIV OF TECH
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