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Narrow-distributed ternary precursors with different particle sizes and preparation method thereof

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

Active Publication Date: 2018-09-28
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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  • Narrow-distributed ternary precursors with different particle sizes and preparation method thereof
  • Narrow-distributed ternary precursors with different particle sizes and preparation method thereof
  • Narrow-distributed ternary precursors with different particle sizes and preparation method thereof

Examples

Experimental program
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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 narrow-distributed ternary precursors with different particle sizes and a preparation method thereof. A complexation controlled crystal coprecipitation method is adopted for preparing and growing a nucleus in a first reaction kettle and nucleating in an environment of increasing solid-liquid ratio, a nickel-cobalt-manganese soluble salt solution and an aqueous solution of sodium hydroxide coprecipitate under complexation of ammonia, so as to prepare narrow-distributed crystal nucleuses, a part of small-size nickel-cobalt-manganese hydroxide in the first reaction kettleis transferred to a second reaction kettle and grows to medium size by increasing the solid-liquid ratio, a part of material in the second reaction kettle is transferred to a third reaction kettle andcontinues to grow to desired large size by increasing the solid-liquid ratio. Three nickel-cobalt-manganese hydroxide precursors with different particle sizes, uniformly distributed elements, good sphericity, narrow particle size distribution, and high tap density are obtained once, further, materials in the second reaction kettle and the third reaction kettle have large particle size, so that when the materials continue growing, the feeding speed is increased and the production efficiency is 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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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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