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Small-particle-size nickel-cobalt-aluminum oxide and preparation method thereof

A nickel-cobalt-aluminum oxide technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of high sphericity, good monodispersity, and low tap density of nickel-cobalt-aluminum cathode materials, and achieve high sphericity. , good monodispersity, uniform size effect

Active Publication Date: 2016-07-27
格林爱科(荆门)新能源材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The small particle size nickel-cobalt-aluminum oxide provided by the invention has high sphericity, good monodispersity, uniform size, and an average particle size of 2.0-4.0 μm. The preparation method is simple, time-consuming, and controllable, and solves the problem of Application Problems of Low Tap Density of Nickel Cobalt Aluminum Cathode Material

Method used

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  • Small-particle-size nickel-cobalt-aluminum oxide and preparation method thereof
  • Small-particle-size nickel-cobalt-aluminum oxide and preparation method thereof
  • Small-particle-size nickel-cobalt-aluminum oxide and preparation method thereof

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preparation example Construction

[0054] Please refer to figure 1 , figure 1 It is a flow chart of the preparation method of nickel-cobalt-aluminum oxide with medium and small particle size of the present invention, comprising the following steps:

[0055] S01, prepare the mixed solution A of nickel salt, cobalt salt, prepare the mixed solution B of aluminum salt and complexing agent, wherein, the mol ratio of nickel, cobalt, aluminum ion in described nickel salt, cobalt salt, aluminum salt is (80 -90):(10-20):(1-10);

[0056] S02. Add the above-mentioned mixed solution A, mixed solution B, precipitant, and ammonia water into the reactor, keep the reaction temperature constant at 65-95°C, and keep the stirring rate constant at 185-275r / min, and carry out segmental co-precipitation reaction, the first The first reaction stage: control the pH to be constant in the range of 11.0-11.8, the ammonia concentration in the reaction system is 5-10g / L, the second reaction stage: reduce the pH of the reaction system to ...

Embodiment 1

[0059] A preparation method of small particle size nickel cobalt aluminum oxide, comprising the following steps:

[0060] (1) Take by weighing nickel sulfate, cobalt sulfate, aluminum sulfate crystal in molar ratio 80:10:10, and take by weighing EDTA, wherein the molar ratio of aluminum sulfate crystal, complexing agent EDTA is 1:0.5, after mixing uniformly, respectively Be made into the aluminum-EDTA mixed solution B of the nickel-cobalt mixed solution A of 85g / L, the 8g / L of metal ion concentration;

[0061] (2) Pure water is added in the reactor, ammoniacal liquor is added, and the concentration of ammoniacal liquor in the bottom liquid is 4g / L, under stirring condition, the sodium hydroxide solution of above-mentioned mixed solution A, mixed solution B and mass concentration 30wt%, 18wt% Add % ammonia water into the reaction kettle concurrently, adjust the stirring speed to 185r / min, the temperature to 65°C, maintain a constant reaction temperature and stirring speed, cont...

Embodiment 2

[0066] A preparation method of small particle size nickel cobalt aluminum oxide, comprising the following steps:

[0067] (1) Take by weighing nickel sulfate, cobalt sulfate, aluminum sulfate crystal in molar ratio 80:10:10, and take by weighing EDTA, wherein the molar ratio of aluminum sulfate crystal, complexing agent EDTA is 1:1, after mixing uniformly, respectively Be made into the nickel-cobalt mixed solution A, the aluminum-EDTA mixed solution B of 10g / L that metal ion concentration is 110g / L;

[0068] (2) add pure water in the reactor, add ammoniacal liquor, make the ammoniacal liquor concentration in the bottom liquid of reaction be 6g / L, under stirring condition, be the sodium hydroxide solution of 20wt% with above-mentioned mixed solution A, mixed solution B and mass concentration , 18wt% ammonia water is added into the reaction kettle concurrently, the stirring speed is adjusted to be 220r / min, the temperature is 75°C, the constant reaction temperature and stirring ...

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Abstract

The invention provides a small-particle-size nickel-cobalt-aluminum oxide which is regular spherical, relatively good in sphericity degree and uniform in particle size distribution and has the average particle size of 2.0-4.0 [mu]m; the bulk density is greater than 0.8 g / cm<3>, the tap density is greater than 1.2 g / cm<3>, and the small-particle-size nickel-cobalt-aluminum oxide can be used for stacking and filling with a large-particle-size nickel-cobalt-aluminum oxide, so as to solve the application problem of low tap density of a positive electrode material. The invention also provides a preparation method of the small-particle-size nickel-cobalt-aluminum oxide, wherein the preparation method comprises the steps: adding a nickel and cobalt mixed solution, an aluminum-complexing agent mixed solution, a precipitating agent and ammonia water into a reactor in a parallel flow manner, and controlling conditions of high pH and low ammonia concentration during an initial stage of a reaction; in the reaction process, under conditions of low pH and high ammonia concentration, making nucleation and growth of a nickel-cobalt-aluminum precursor implemented separately, preparing a small-particle-size nickel-cobalt-aluminum oxide precursor, and calcining to obtain the small-particle-size nickel-cobalt-aluminum oxide with good sphericity degree and high tap density. The preparation method has the advantages of simple process, high controllability and low cost.

Description

technical field [0001] The invention belongs to the technical field of battery material preparation, and in particular relates to a nickel-cobalt-aluminum oxide with a small particle size 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. Especially with the advent of Tesla electric vehicles, nickel-cobalt-aluminum ternary materials, as the positive electrode material of Tesla MODELS, have led the development direction of power batteries. Among them, the preparation of spherical nickel-cobalt-aluminum ternary precursors and related materials with high tap density and good sphericity is the key to the development of lithium-ion batteries with high energy density and high cycle performance. [0003] According to the principle of close packing, in order to increase the tap density of nickel-cobalt-aluminum cathode materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48
CPCY02E60/10
Inventor 张云河郭苗苗乐绪清刘文泽
Owner 格林爱科(荆门)新能源材料有限公司
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