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Nickel-cobalt-aluminium oxide precursor, nickel-cobalt-aluminium oxide and preparation method therefor

A nickel-cobalt hydroxide and oxide technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of poor sphericity and uneven element distribution of nickel-cobalt-aluminum materials, and achieve good consistency and volume shrinkage Small, good spherical effect

Active Publication Date: 2016-05-04
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation method has a simple process and a high degree of controllability, and solves the inconsistency in the distribution of the three elements of nickel, cobalt, and aluminum caused by the incomplete precipitation of aluminum ions in the preparation of nickel-cobalt-aluminum oxide precursor materials in the prior art. Uniformity and poor sphericity of nickel-cobalt-aluminum materials

Method used

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  • Nickel-cobalt-aluminium oxide precursor, nickel-cobalt-aluminium oxide and preparation method therefor
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  • Nickel-cobalt-aluminium oxide precursor, nickel-cobalt-aluminium oxide and preparation method therefor

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preparation example Construction

[0068] Please refer to figure 1 , figure 1 It is a flow chart of the preparation method of nickel-cobalt-aluminum oxide precursor in the present invention, comprising the following steps:

[0069] S01, prepare the mixed salt solution of nickel salt and cobalt salt, the mol ratio of nickel and cobalt ions in the mixed salt solution is (1.5~12):1, get complexing agent, precipitating agent, described complexing agent, The precipitant and the mixed salt solution are added to the reactor under stirring conditions to carry out the co-precipitation reaction. During the reaction, the reaction temperature is controlled in the range of 45-70 °C, and the pH value is in the range of 9.5-11.5. Finally, solid-liquid separation is performed on the reacted material to obtain a solid product, and the solid product is washed and dried to obtain nickel-cobalt hydroxide;

[0070] S02. Take the organoaluminum source for heating and melting, mix the melted organoaluminum source with the above-m...

Embodiment 1

[0072] A preparation method of nickel cobalt aluminum oxide, comprising the following steps:

[0073] (1) prepare the mixed salt solution of nickel nitrate and cobalt nitrate, the mol ratio of nickel and cobalt ions in the mixed salt solution is 9:0.085; add reaction bottom liquid in co-precipitation reactor, reaction bottom liquid is water, complex Mixture—a mixed system of ammonia water and sodium hydroxide. At the beginning of the reaction, the concentration of ammonia water in the reaction bottom liquid is 4g / L. NaOH is used to adjust the pH value of the reaction bottom liquid to 9.5, the temperature is 45°C, and the rotation speed is 150r / min , the prepared nickel-cobalt mixed salt solution and the concentration of 5 ~ 6g / L of ammonia, the concentration of 32% NaOH solution are added to the reaction kettle in parallel to carry out the coprecipitation reaction, wherein the addition speed of the nickel-cobalt mixed salt is 100L / h, the addition rate of NaOH is 28L / h, the add...

Embodiment 2

[0082] A preparation method of nickel cobalt aluminum oxide, comprising the following steps:

[0083] (1) prepare the mixed salt solution of nickel sulfate, cobalt sulfate, the mol ratio of nickel, cobalt ion is 8:1 in the described mixed salt solution; Add reaction bottom liquid in coprecipitation reactor, reaction bottom liquid is water, complex Mixture—a mixed system of ammonia water and sodium hydroxide. At the beginning of the reaction, the concentration of ammonia water in the reaction bottom liquid is 5g / L. NaOH is used to adjust the pH value of the reaction bottom liquid to 9.7, the temperature is 50°C, and the rotation speed is 130r / min , using as figure 2 Stir with the stirring paddle shown; add the prepared nickel-cobalt mixed salt solution, ammonia water with a concentration of 5g / L, and NaOH solution with a concentration of 30% into the reactor to carry out coprecipitation reaction, wherein, nickel-cobalt mixed The addition rate of salt is 140L / h, the addition r...

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Abstract

The invention provides a preparation method for a nickel-cobalt-aluminium oxide precursor. A dry nickel-cobalt hydroxide with a large specific surface area and relatively high degree of sphericity is obtained through a coprecipitation method; a melted organic aluminium source is mixed with the dry nickel-cobalt hydroxide to enable the aluminium element to be fully and uniformly adsorbed on the porous structure of the nickel-cobalt hydroxide under vacuum negative pressure for realizing uniform distribution of the aluminium element in the nickel-cobalt hydroxide; and the nickel-cobalt-aluminium oxide precursor with high degree of sphericity and high tap density is obtained by drying. The preparation method is simple in process and high in degree of controllability; the problems of uneven distribution of nickel, cobalt and aluminium elements and low degree of sphericity of the nickel-cobalt-aluminium material caused by incomplete precipitation of aluminium ions in the preparation of the nickel-cobalt-aluminium oxide precursor material in the prior art are solved; and the invention also provides the nickel-cobalt-aluminium oxide precursor prepared by the preparation method, and a nickel-cobalt-aluminium oxide and a preparation method therefor.

Description

technical field [0001] The invention belongs to the technical field of battery material preparation, and in particular relates to a precursor of nickel-cobalt-aluminum oxide, nickel-cobalt-aluminum oxide and a preparation method thereof. Background technique [0002] Lithium-ion batteries are a new generation of green high-energy batteries, which are increasingly playing an important role in various fields. The positive electrode material of lithium battery determines the performance, price and development of lithium battery. At present, ternary battery materials (such as nickel-cobalt-aluminum, etc.) have become a research hotspot because of their excellent comprehensive properties. Because relatively cheap nickel replaces 2 / 3 (or more) of cobalt in lithium cobalt oxide, its cost has At the same time, the incorporation of aluminum can inhibit the crystal structure change of the battery cathode material during charging and discharging, improve thermal stability, and improve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525
CPCH01M4/525Y02E60/10
Inventor 许开华张云河
Owner JINGMEN GEM NEW MATERIAL
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