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Preparation method of spherical nickel-cobalt-aluminum hydroxide precursor

A spherical nickel-cobalt-aluminum and hydroxide technology, which is applied in nickel oxide/nickel hydroxide, electrical components, battery electrodes, etc., can solve the problem of poor precursor crystal lattice order, uneven distribution of aluminum elements, aluminum ion Fast settling speed and other issues, to achieve the effects of good rate performance and safety performance, high sphericity, and high tap density

Active Publication Date: 2015-05-27
贝特瑞(江苏)新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the problems existing in the existing method for preparing nickel-cobalt-aluminum hydroxide precursors, for example, the precipitation speed of aluminum ions is too fast to form a homogeneous co-precipitation with nickel and cobalt ions, which leads to the crystallization of nickel-cobalt-aluminum hydroxide precursors. Lattice order becomes poor, sphericity is not good, tap density is low, aluminum element distribution is uneven, etc., the present invention provides a kind of preparation method of nickel cobalt aluminum hydroxide precursor, this method can make aluminum ion and nickel , cobalt ions form homogeneous co-precipitation, the prepared nickel-cobalt-aluminum hydroxide precursor has good sphericity, high tap density, and uniform distribution of aluminum elements. At the same time, the preparation process is simpler and there is no problem of clogging the pipeline

Method used

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  • Preparation method of spherical nickel-cobalt-aluminum hydroxide precursor

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Experimental program
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Embodiment 1

[0040] (1) Dissolve polyaluminum chloride in deionized water, and mechanically stir until a transparent and clear solution is obtained, and the aluminum ion content is 0.05mol / L to form solution A;

[0041] (2) Nickel sulfate and cobalt sulfate are weighed in a molar ratio of 16:3, then dissolved in deionized water to prepare a salt solution with a mixing uniform concentration of 2mol / L to form solution B;

[0042](3) Pump solution A, solution B, ammonia water and sodium hydroxide together into the co-precipitation reaction kettle equipped with ammonia water and sodium hydroxide mixed solution to carry out continuous co-precipitation reaction (the initial temperature of the bottom liquid is 55 ° C, the pH value 10.5, the ammonia content is 5g / L), the pH value of the reaction system is controlled at 10.5 during the reaction, the ammonia content is controlled at 5g / L in the reaction system, and the temperature of the reaction system is controlled at 55°C; after the reaction is st...

Embodiment 2

[0045] (1) Dissolve polyaluminum chloride in deionized water, and mechanically stir until a transparent and clear solution is obtained, and the aluminum ion content is 0.1mol / L to form solution A;

[0046] (2) Nickel sulfate and cobalt sulfate are weighed in a molar ratio of 17:2, then dissolved in deionized water to prepare a salt solution with a uniform concentration of 1.5mol / L to form solution B;

[0047] (3) Pump solution A, solution B, ammonia and potassium hydroxide together into a co-precipitation reactor equipped with a mixture of ammonia and potassium hydroxide for continuous co-precipitation reaction (the initial temperature of the bottom liquid is 50 ° C, the pH value 12.40, the ammonia content is 25g / L), the pH value of the reaction system is controlled at 12.40 during the reaction, the ammonia content is controlled at 25g / L in the reaction system, and the temperature of the reaction system is controlled at 50°C; after the reaction is stable, the overflowing slurry...

Embodiment 3

[0050] (1) Dissolve polyaluminum chloride in deionized water, and mechanically stir until a transparent and clear solution is obtained, and the aluminum ion content is 0.05mol / L to form solution A;

[0051] (2) nickel sulfate and cobalt sulfate are weighed in a molar ratio of 12:7, then dissolved in deionized water to prepare a salt solution with a uniform concentration of 1.0mol / L to form solution B;

[0052] (3) Pump solution A, solution B, ammonia water and sodium hydroxide together into the co-precipitation reactor equipped with ammonia water and sodium hydroxide mixed solution to carry out continuous co-precipitation reaction (the initial temperature of the bottom liquid is 55 ° C, the pH value 10.70, the ammonia content is 8g / L), the pH value of the reaction system is controlled at 10.70 during the reaction, the ammonia content is controlled at 8g / L in the reaction system, and the temperature of the reaction system is controlled at 50°C; after the reaction is stable, the ...

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Abstract

The invention provides a preparation method of a spherical nickel-cobalt-aluminum hydroxide precursor. The spherical nickel-cobalt-aluminum hydroxide precursor is prepared with poly aluminium chloride as an aluminum source. The preparation method is simple in process, low in cost and suitable for large-scale industrial production. The prepared spherical nickel-cobalt-aluminum hydroxide precursor is good in sphericity, high in tap density and uniform in distribution of aluminum element.

Description

technical field [0001] The invention belongs to the field of lithium-ion secondary batteries, and in particular relates to a preparation method of a spherical nickel-cobalt-aluminum hydroxide precursor. Background technique [0002] Lithium-ion batteries have been widely used in 3C, power and energy storage fields due to their high energy density, good cycle performance, and environmental protection. However, with the rapid development of society, people's demand for lithium-ion batteries with higher energy density and smaller volume is becoming more and more urgent. The improvement of the energy density of lithium-ion batteries mainly depends on the positive electrode material and the negative electrode material. At present, the specific capacity of the lithium-ion negative electrode material is much higher than that of the positive electrode material. Therefore, the positive electrode material has become the main bottleneck restricting the energy improvement of lithium-ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/04H01M4/525H01M4/48
CPCY02E60/10
Inventor 陈万超杨顺毅黄友元任建国
Owner 贝特瑞(江苏)新材料科技有限公司
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