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Preparation method of continuous Ni-Co-Al ternary precursor

A precursor, nickel-cobalt-aluminum technology, which is applied in the field of continuous nickel-cobalt-aluminum ternary precursor preparation, can solve the problems of lowering product quality and less residence time, meeting the cost of manufacturers, reducing crystal nuclei, and facilitating production lines Yield effect

Inactive Publication Date: 2018-04-13
HUNAN ZOOMWE NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the continuous production process, the particle size distribution is normal from small to large, and small particles will always exist in the reaction process, but when downstream customers use ternary precursors containing small particles, there will be a problem of high material viscosity Although it is not sensitive to this phenomenon in the low-end market, it is a product defect of "one-vote veto" in the high-end market
And in the process of continuous preparation of the ternary precursor, the reaction kettle is fed and overflowed at the same time. The reason for the generation of small particles is that the raw material liquid that has just entered the reaction kettle undergoes a precipitation reaction, and the small particles generated are in the reaction kettle. If the residence time is too small, the stool overflows before it grows up, thus reducing the product quality

Method used

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Examples

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Effect test

preparation example Construction

[0025] A method for preparing a continuous nickel-cobalt-aluminum ternary precursor, using metal salt solution, aluminum alkali, liquid alkali and ammonia solution as raw materials, using four liquid inlet pipes to continuously flow into the reactor for reaction, and passing Control the solution injection speed, PH value, reaction temperature, stirring speed and other parameters to effectively control the chemical impurities and crystal crystallinity, particle size, density, etc. of the lithium battery ternary precursor. The ternary precursor nickel cobalt lithium manganese oxide.

[0026] It should be noted that the flow ratio of the upper and lower liquid inlet pipes in the invention is 1:0.1~10, here the flow ratio of the upper liquid inlet pipe and the lower liquid inlet pipe can be 1:0.1~10; The flow ratio between the liquid inlet pipe and the upper liquid inlet pipe is 1:0.1~10, which can achieve the effect of reducing the number of crystal nuclei and increasing the part...

Embodiment 1

[0030] Embodiment one: preparation concentration is the metal salt solution of 120g / L, the aluminum alkali of 4g / L, the liquid caustic soda of 32g / L, the ammoniacal solution of 12g / L in concentration; , Ammonia solution is added through the corresponding liquid inlet pipe with a size of 5m 3 Reaction in the reaction still; The liquid caustic soda is added to the reaction kettle through the upper liquid inlet pipe, and the aluminum alkali is added to the reaction kettle through the lower liquid inlet pipe. , the flow rate of the lower liquid inlet pipe is 20L / h; the pH in the control reactor is 10, the temperature of the reactor is 40°C, and the average residence time of the material in the reactor is 5 hours, and it is continuously passed into the reactor. Enter nitrogen, turn on the stirring paddle to realize stirring, and the two ends of the stirring paddle are divided into an upper layer stirring paddle positioned at the upper end and a lower layer paddle positioned at the ...

Embodiment 2

[0032] Embodiment two: preparation concentration is the metal salt solution of 120g / L, the aluminum alkali of 6g / L, the liquid caustic soda of 32g / L, the ammonia solution of 25g / L in concentration; , Ammonia solution is added through the corresponding liquid inlet pipe with a size of 5m 3Reaction in the reaction still; The liquid caustic soda is added to the reaction kettle through the upper liquid inlet pipe, and the aluminum alkali is added to the reaction kettle through the lower liquid inlet pipe. , the flow rate of the lower liquid inlet pipe is 20L / h; the pH in the control reactor is 11.5, the temperature of the reactor is 80°C, the average residence time of the material in the reactor is 20 hours, and the continuous flow into the reactor is 20 hours. Enter nitrogen, open the stirring paddle to realize stirring, and the two ends of the stirring paddle are divided into the upper layer stirring paddle positioned at the upper end and the lower layer paddle positioned at the...

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Abstract

The invention relates to a preparation method of a continuous Ni-Co-Al ternary precursor. The preparation method comprises the steps of preparing a metal salt solution of a certain concentration, an aluminum alkali, liquid sodium hydroxide and an ammonia solution; adding into a reaction kettle for reaction, wherein the liquid sodium hydroxide is added into the reaction kettle via an upper liquid inlet tube, the aluminum alkali is added into the reaction kettle via a lower liquid inlet tube, and the upper liquid inlet tube and the lower liquid inlet tube are connected in parallel to the reaction kettle; opening an overflowing valve so that a reaction liquid flows into an aging groove for aging until an internal liquid level of the reaction kettle is flush with the overflowing valve when a liquid level in the reaction kettle is raised to be approximate to a reaction kettle cover, and closing the overflowing valve; repeating accordingly; and washing and drying the aged product to obtain the Ni-Co-Al ternary precursor. By a method of the liquid sodium hydroxide injected via the two liquid inlet tubes, a part of liquid sodium hydroxide is guided into the reaction kettle via the upper liquid inlet tube, the pH in an existing technical reaction can be locally reduced, the crystal nucleus can be obviously reduced, the D0 is improved, and the overflowing valve is adjusted to be an intermittent opening state from a normally-open state.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material, in particular to a preparation method of a continuous nickel-cobalt-aluminum ternary precursor. Background technique [0002] With the continuous development of my country's economy and technology, the use of energy has also increased, especially the rapid development of industry, which consumes a lot of battery energy, and the harmful substances produced are likely to cause damage to the ecological environment. Therefore, the country puts forward higher requirements on the use of energy, not only to improve the efficiency of energy use, but also to achieve energy conservation and emission reduction, and to strengthen the purpose of natural ecological protection. Therefore, it is extremely important to improve the structure of battery energy devices, especially the preparation of high-purity battery energy materials. [0003] At present, the production method of the nickel-cobalt-mangane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/46H01M10/0525
CPCH01M4/463H01M4/525H01M10/0525Y02E60/10
Inventor 朱忠泗涂勇訚硕刘兴国
Owner HUNAN ZOOMWE NEW ENERGY TECH CO LTD
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