A kind of method for reducing sulfur content of nickel-cobalt-aluminum precursor

A nickel-cobalt-aluminum and precursor technology, applied in chemical instruments and methods, nickel compounds, inorganic chemistry, etc., can solve problems such as difficulty in meeting the requirements of impurity sulfur content, poor sulfate removal effect, etc., and achieve low cost and efficiency. High, maneuverable effect

Active Publication Date: 2019-08-20
ZHEJIANG HUAYOU COBALT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sulfate radicals adsorbed on the surface of the nickel-cobalt-aluminum precursor can be removed by using traditional lyes such as sodium hydroxide and lithium hydroxide, but the removal effect on the sulfate radical in the crystal structure of the nickel-cobalt-aluminum precursor is not good, and it is difficult to meet the requirements of the positive electrode material for power batteries. Requirements for sulfur content of impurities

Method used

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  • A kind of method for reducing sulfur content of nickel-cobalt-aluminum precursor
  • A kind of method for reducing sulfur content of nickel-cobalt-aluminum precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Pass nickel-cobalt-aluminum mixed metal solution, sodium hydroxide, and ammonia water into the reaction kettle at the same time, and control the feed rate so that the residence time of the reaction is 20h-22h, the reaction temperature is 59°C-61°C, and the pH value is 11.00- 11.10, ammonia value 7.5g L -1 -8.0g·L -1 , stirring speed 600rpm-610rpm, N 2 atmosphere, to obtain nickel-cobalt-aluminum precursor precipitation and mother liquor, remove the mother liquor to obtain nickel-cobalt-aluminum precursor, and its FESEM photo is attached figure 1 shown.

[0028] (2) Transfer the nickel-cobalt-aluminum precursor in step (1) to the washing kettle for washing. There are 2 baffles inside the washing kettle, which are evenly distributed; the stirring paddle is 1 layer, and the bottom stirring paddle is push-type Stirring paddles; the number of paddle blades of each layer of stirring paddles is 3.

[0029] (3) Slurry washing: add the washing solution into the washing k...

Embodiment 2

[0033] (1) Pass the nickel-cobalt-aluminum mixed metal solution, sodium hydroxide, and ammonia water into the reaction kettle at the same time, and control the feed rate so that the residence time of the reaction is 30h-32h, the reaction temperature is 54°C-56°C, and the pH value is 10.80- 10.90, ammonia value 6.0g·L -1 -6.5g·L -1 , stirring speed 650rpm-660rpm, N 2 atmosphere to obtain nickel-cobalt-aluminum precursor precipitation and mother liquor, and remove the mother liquor to obtain the nickel-cobalt-aluminum precursor.

[0034] (2) Transfer the nickel-cobalt-aluminum precursor in step (1) to the washing kettle for washing. There are 4 baffles inside the washing kettle, which are evenly distributed; the stirring paddles are 2 layers, and the bottom stirring paddles are push-type Stirring paddles; the number of paddle blades of each layer of stirring paddles is 4.

[0035] (3) Slurry washing: add the washing solution into the washing kettle, and start stirring. Washi...

Embodiment 3

[0039] (1) Pass nickel-cobalt-aluminum mixed metal solution, sodium hydroxide, and ammonia water into the reaction kettle at the same time, and control the feed rate so that the residence time of the reaction is 12h-14h, the reaction temperature is 48°C-50°C, and the pH value is 11.25- 11.35, ammonia value 9.5g L -1 -10g·L -1 , stirring speed 690rpm-700rpm, N2 atmosphere to obtain nickel-cobalt-aluminum precursor precipitation and mother liquor, and remove the mother liquor to obtain the nickel-cobalt-aluminum precursor.

[0040] (2) Transfer the nickel-cobalt-aluminum precursor in step (1) to the washing kettle for washing. There are 8 baffles inside the washing kettle, which are evenly distributed; the stirring paddles are 3 layers, and the bottom stirring paddles are push-type Stirring paddles; the number of paddle blades of each layer of stirring paddles is 4.

[0041] (3) Slurry washing: add the washing solution into the washing kettle, and start stirring. The washing ...

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Abstract

The invention discloses a method for reducing the sulfur content of a nickel cobalt aluminum precursor. Sulfate radicals adsorbed at the surface of the nickel cobalt aluminum precursor can be removed by traditional alkali liquid such as sodium hydroxide and lithium hydrate, but the removal effect on the sulfate radicals in the nickel cobalt aluminum precursor crystalline structure is poor; the requirement of a power battery positive electrode material on the impurity sulfur content is different to meet. The method is characterized in that a nickel cobalt aluminum mixed metal solution, sodium hydroxide and ammonium hydroxide are added into a reaction kettle at the same time; the nickel cobalt aluminum precursor is obtained through controlling the reaction conditions; after the mother liquid removal, the nickel cobalt aluminum precursor is transferred into a washing kettle to be subjected to sizing washing and water washing; then, drying and sieving are performed to obtain the nickel cobalt aluminum precursor with the sulfur content being smaller than or equal to 1000ppm. The method has the advantages that the washing solution is low in cost; the washing process is simple; the operability is high; the efficiency is high; no destroy effect is generated on the microtopography of the nickel cobalt aluminum precursor; the method belongs to a process applicable to industrial production; practical values are realized.

Description

technical field [0001] The invention belongs to the technical field of precursors of nickel-cobalt-aluminum cathode materials for lithium-ion batteries, in particular to a method for reducing the sulfur content of the nickel-cobalt-aluminum precursors. Background technique [0002] With the rapid development of the electric vehicle market, the power lithium-ion battery, as one of its core components, is highly concerned by the industry. Due to the adverse effects of impurities on the safety performance, electrochemical performance, and cycle life of batteries, the requirements for the control of impurities in cathode materials for power lithium ions are very strict. [0003] Nickel-cobalt lithium aluminate (NCA) cathode material is one of the cathode materials for power lithium-ion batteries. The preparation of NCA by co-precipitation method mainly has the following three process routes: (1) Preparation of Ni by co-precipitation method 1-x-y co x Al y (OH) 2 , and then m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00
Inventor 邱天王娟朱玉华赵斌杰崔玉听蔡增富高炯信沈震雷
Owner ZHEJIANG HUAYOU COBALT
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