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A kind of preparation method and preparation system of lithium-ion battery cathode material precursor

A technology for lithium-ion batteries and positive electrode materials, which is applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., to achieve a wide range of applications, strong operability, and the effect of reducing the content of micropowder

Active Publication Date: 2020-09-29
JINCHI ENERGY MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the above background technology, to provide a preparation method and preparation system of a lithium ion battery cathode material precursor with adjustable diameter, the method combines the discontinuous method and The advantages of the continuous method solve the technical problems of difficult control in the combined scheme of a single reactor and a cyclone classifier, and the high content of fine powder in the sand outlet of the cyclone classifier. The particle size distribution of the obtained precursor is adjustable from 0.6 to 1.2. And the solid content in the reactor is stable, which can ensure the stable operation of the reaction

Method used

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  • A kind of preparation method and preparation system of lithium-ion battery cathode material precursor
  • A kind of preparation method and preparation system of lithium-ion battery cathode material precursor
  • A kind of preparation method and preparation system of lithium-ion battery cathode material precursor

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Embodiment 1

[0049] A preparation method of a lithium-ion battery positive electrode material precursor, the method is used to prepare a D50 of 10.5 μm, a slurry diameter of 0.633 precursor products, comprising the following steps:

[0050] (1) Prepare nickel sulfate, cobalt sulfate, and manganese sulfate solutions with a total metal concentration of 2mol / L, the molar ratio of nickel, cobalt, and manganese is 6:2:2, prepare 2mol / L sodium hydroxide solution and 6mol / L ammonia aqueous solution.

[0051] (2) Add the mixed salt solution of nickel, cobalt and manganese into the primary reaction kettle, and at the same time feed the sodium hydroxide solution and ammonia solution, and control the feed flow rate of the mixed salt solution of nickel, cobalt and manganese to 1L / min to maintain the primary reaction The pH value in the kettle is 11.0-11.5, the concentration of ammonium ion is 20g / L, the reaction temperature is 55°C, the stirring speed is 400rpm, and nitrogen protection is introduced i...

Embodiment 2

[0058] A preparation method of a lithium-ion battery positive electrode material precursor, the method is used to prepare a D50 of 3.7 μm, a slurry diameter of 1.004 of the precursor product, comprising the following steps:

[0059] (1) Prepare a solution of nickel sulfate, cobalt sulfate and manganese sulfate with a total metal concentration of 2mol / L, the molar ratio of nickel, cobalt and manganese is 5:2:3, prepare 2mol / L sodium hydroxide solution and 6mol / L ammonia aqueous solution.

[0060] (2) Add the mixed salt solution of nickel-cobalt-manganese into the primary reactor, and feed the sodium hydroxide solution and ammonia solution at the same time, control the feed flow rate of the mixed salt solution of nickel-cobalt-manganese to 1.2L / min, and keep the reactor The pH value in the reactor is 11.0-11.5, the ammonium ion concentration is 10g / L, the reaction temperature is 60°C, the stirring speed is 500rpm, and nitrogen protection is introduced into the reactor. By adjust...

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Abstract

The invention discloses a preparation method for a precursor of a positive electrode material of a lithium ion battery. The preparation method comprises the following steps: (1) carrying out a coprecipitation reaction in a primary reaction kettle to prepare a precursor seed crystal, adding the precursor seed crystal prepared in the primary reaction kettle into a secondary reaction kettle, and carrying out stirring for a coprecipitation reaction; and (2) pumping precursor slurry generated by the reaction in the secondary reaction kettle into a cyclone classifier for classification, enabling overflow slurry to flow back into the secondary reaction kettle, discharging underflow slurry from a sand setting port of the cyclone classifier, collecting the underflow slurry, and carrying out aging,washing and drying to obtain the precursor. The invention also provides a preparation system for the precursor of the positive electrode material of the lithium ion battery. The method provided by theinvention combines the advantages of an intermittent method and a continuous method, the particle size distribution of the obtained precursor is adjustable in a range of 0.6-1.2, a solid content in the reaction kettle is stable, and the stable operation of the reaction can be ensured.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to a preparation method and a preparation system of a lithium ion battery cathode material precursor. Background technique [0002] Since Sony first commercialized lithium-ion batteries in 1991, lithium-ion battery technology has developed rapidly and is widely used in mobile electronic devices, power tools, electric vehicles, military and other fields. As my country, major countries in Europe and the United States, and Japan have successively raised the development of new energy vehicles to a national strategy, people have put forward higher requirements for the comprehensive performance of power lithium-ion batteries. [0003] In addition to requiring high specific capacity, the importance of safety and cycle performance has become increasingly prominent for power-type lithium-ion battery cathode materials. The precursor produced by the conventional continuous method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00C01G53/04H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01G53/04C01P2004/61H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 胡海诗黎力何绪锋熊意球朱璟张娉婷刘庭杰孟立君胡志兵张海艳
Owner JINCHI ENERGY MATERIALS CO LTD
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