A kind of different particle size narrow distribution ternary precursor and its preparation method

A precursor and narrow distribution technology, applied in the direction of electrical components, structural parts, battery electrodes, etc., can solve the problems of low tap density, uneven particle size, high production cost, etc., achieve narrow particle size distribution, ensure uniformity, and disperse good sex effect

Active Publication Date: 2021-02-26
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

Method used

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  • A kind of different particle size narrow distribution ternary precursor and its preparation method
  • A kind of different particle size narrow distribution ternary precursor and its preparation method
  • A kind of different particle size narrow distribution ternary precursor and its preparation method

Examples

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Effect test

Embodiment 1

[0036] A preparation method of a ternary precursor with narrow distribution of different particle sizes:

[0037] (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;

[0038] (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

[0058] A preparation method of a ternary precursor with narrow distribution of different particle sizes:

[0059] (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;

[0060] (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;

[0061](3) Feed nitrogen into the sealed first reacti...

Embodiment 3

[0078] A preparation method of a ternary precursor with narrow distribution of different particle sizes:

[0079] (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;

[0080] (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;

[0081] (3) Feed nitrogen into the sealed first reaction kettle, ...

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Abstract

The invention discloses a ternary precursor with a narrow distribution of different particle sizes and a preparation method thereof. The complexation-controlled crystallization co-precipitation method is adopted, and nucleation, growth, and nucleation in a continuously increasing solid-liquid ratio environment are carried out in a first reaction kettle. , Nickel-cobalt-manganese soluble salt solution and sodium hydroxide aqueous solution carry out co-precipitation reaction under the complexation of ammonia to prepare narrowly distributed crystal nuclei, and then transfer part of the small particle size nickel-cobalt-manganese hydroxide in the first reactor to Go to the second reactor to increase the solid-liquid ratio to grow to a medium particle size, and then transfer part of the material from the second reactor to the third reactor to increase the solid-liquid ratio and continue to grow to the required large particle size. Not only can three kinds of nickel-cobalt-manganese hydroxide precursors with different particle sizes, uniform element distribution, good sphericity, narrow particle size distribution and high tap density be obtained at the same time, but also because the materials in the second reactor and the third reactor The particle size itself is large, and the feeding speed can be increased to a certain extent during the regrowth, and the production efficiency can be improved.

Description

technical field [0001] The invention relates to the field of cathode materials for lithium-ion batteries, in particular to a ternary precursor with a narrow distribution of different particle sizes and a preparation method thereof. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62
CPCH01M4/362H01M4/505H01M4/525H01M4/62Y02E60/10
Inventor 徐剑晖吕小梅刘鹏范洪波
Owner DONGGUAN UNIV OF TECH
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