Preparation method of NCA precursor

A precursor and solid technology, applied in the field of preparation of NCA precursors, can solve the problems of uneven aluminum content inside and outside the nickel cobalt aluminum hydroxide, affecting quality stability and production efficiency, and large fluctuations in density and morphology. Achieve the effect of good electrochemical performance, stable content and stable physical and chemical indicators

Inactive Publication Date: 2017-02-01
宋程
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Due to the defect of the batching method in the conventional NCA precursor preparation technology, the aluminum content in the prepared nickel-cobalt-aluminum hydroxide is uneven inside and outside, and the density and shape fluctuate greatly, which makes the process of NCA materials unstable during the sintering process. Different production batches adjust different sintering processes, which affects quality stability and production efficiency

Method used

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  • Preparation method of NCA precursor

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Embodiment 1

[0020] The invention provides a kind of preparation method of NCA precursor, and this method comprises the steps:

[0021] (1) Mix the water-soluble salt of Ni and the water-soluble salt of Co and prepare an aqueous solution to obtain a mixed ion solution, wherein the mixed ion solution includes Ni 2+ and Co 2+ The mixed ion concentration is 1.5mol / L;

[0022] (2) Prepare mixed alkali solution Ⅰ, first prepare sodium hydroxide solution with a concentration of 3.0mol / L, then add a certain amount of solid aluminum sulfate, the concentration is 0.2mol / L, after it is completely dissolved, add ammonia water, the concentration is 0.1mol / L, so far the configuration of the mixed alkali solution I is completed;

[0023] (3) Prepare the mixed alkali solution II. First prepare a sodium hydroxide solution with a concentration of 3.0mol / L, then add a certain amount of solid aluminum sulfate with a concentration of 0.3mol / L. After it is completely dissolved, add ammonia water with a conc...

Embodiment 2

[0027] The invention provides a kind of preparation method of NCA precursor, and this method comprises the steps:

[0028] (1) Mix the water-soluble salt of Ni and the water-soluble salt of Co and prepare an aqueous solution to obtain a mixed ion solution; wherein the mixed ion solution includes Ni 2+ and Co 2+ The concentration of mixed ions is in the range of 1.0mol / L;

[0029] (2) Prepare mixed alkali solution I, first prepare sodium hydroxide solution with a concentration of 2mol / L, then add a certain amount of solid aluminum sulfate, the concentration is 0.3mol / L, after it is completely dissolved, add ammonia water, the concentration is 0.3mol / L L, so far the configuration of the mixed alkali solution I is completed;

[0030] (3) Prepare mixed alkali solution II, first prepare sodium hydroxide solution with a concentration of 2.0mol / L, then add a certain amount of solid aluminum sulfate with a concentration of 0.4mol / L, after it is completely dissolved, add ammonia wate...

Embodiment 3

[0034] The invention provides a kind of preparation method of NCA precursor, and this method comprises the steps:

[0035] (1) Mix the water-soluble salt of Ni and the water-soluble salt of Co and prepare an aqueous solution to obtain a mixed ion solution; wherein the mixed ion solution includes Ni 2+ and Co 2+ The concentration of mixed ions is in the range of 1.5mol / L;

[0036] (2) Prepare mixed alkali solution Ⅰ, first prepare sodium hydroxide solution with a concentration of 3.0mol / L, then add a certain amount of solid aluminum sulfate, the concentration is 0.25mol / L, after it is completely dissolved, add ammonia water, the concentration is 0.25mol / L, so far the configuration of the mixed alkali solution I is completed;

[0037] (3) Prepare the mixed alkali solution II. First prepare a sodium hydroxide solution with a concentration of 3.0mol / L, then add a certain amount of solid aluminum sulfate with a concentration of 0.4mol / L. After it is completely dissolved, add amm...

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Abstract

The invention discloses a preparation method of an NCA precursor. The preparation method comprises the following steps: mixing water-soluble salt of Ni and water-soluble salt of Co, and preparing into an aqueous solution to obtain a mixed ion solution, wherein in the mixed ion solution, the concentration of mixed ions comprising Ni<2+> and Co<2+> is in the range of 0.8-2.3 mol / L; preparing a mixed alkali liquid: preparing a sodium hydroxide solution with the concentration of 0.5-4.0 mol / L first, then adding a certain amount of aluminum sulfate solid with the concentration of 0.2-0.5 mol / L, completely dissolving, adding ammonia water with the concentration of 0.05-1.0 mol / L to obtain the mixed alkali solution II; continuously adding the mixed ion solution into a reactor, performing an equimolar synthesis reaction on the mixed ion solution and the mixed alkali solution, and constantly adjusting the flow rate to stabilize the pH during the reaction; performing solid-liquid separation on a synthetic product in the step, washing obtained solid, and drying to obtain a ternary cathode material NCA precursor.

Description

technical field [0001] The invention relates to an NCA precursor preparation technology, in particular to a preparation method of an NCA precursor. Background technique [0002] Due to the defect of the batching method in the conventional NCA precursor preparation technology, the aluminum content in the prepared nickel-cobalt-aluminum hydroxide is uneven inside and outside, and the density and shape fluctuate greatly, which makes the process of NCA materials unstable during the sintering process. Different production batches adjust different sintering processes, which affects quality stability and production efficiency. [0003] The invention of this technology can help to stabilize the reaction process. Adding the aluminum salt to the lye and then carrying out the precipitation reaction makes the aluminum content in the particles more uniform, and the aluminum ions are more effectively complexed, and the nickel-cobalt hydroxide produced The stable aluminum content and go...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/04
CPCC01G53/04C01G53/006C01P2004/03C01P2004/61C01P2006/11
Inventor 周怡静袁明刚苗芳
Owner 宋程
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