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Method for reducing sulfur content of nickel-cobalt-manganese ternary positive electrode material precursor

A cathode material and precursor technology, applied in the field of reducing the sulfur content of nickel-cobalt-manganese ternary cathode material precursors, can solve the problem of corrosion of production equipment, poor removal effect, influence of NCM structural stability, crystallinity and unit cell parameters, etc. problems, to achieve the effect of reducing pollution, reducing the amount of washing water, and reducing production costs

Pending Publication Date: 2020-10-23
HUNAN BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method inevitably introduces SO on the surface and inside of the precursor particle 4 2- Impurities, SO 4 2- It will enter the NCM during the calcination process, thereby affecting the structural stability, crystallinity and unit cell parameters of the NCM. The SO produced during the calcination process 2 It will also corrode the production equipment
Commonly used lye washing can only remove SO on the surface of precursor particles 4 2- , for the SO inside the precursor particle 4 2- poor removal

Method used

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  • Method for reducing sulfur content of nickel-cobalt-manganese ternary positive electrode material precursor
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  • Method for reducing sulfur content of nickel-cobalt-manganese ternary positive electrode material precursor

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Embodiment 1

[0047] A method for reducing the sulfur content of the precursor of the nickel-cobalt-manganese cathode material includes the following steps:

[0048] (1) Combine a mixed solution of nickel, cobalt and manganese with a nickel content of 47.45g / L, a cobalt content of 18.8g / L, and a manganese content of 26.4g / L, and 400g / L sodium hydroxide and 8% ammonia water. At the same time, it is transported to the reactor by a metering pump, and high-purity nitrogen is introduced into the reactor. The temperature in the reactor is controlled at 65~70℃, pH is 10.5~11, and the ammonia value is in the range of 5~8g / L. After the particle size D50 of the precursor in the reactor reaches 10 microns, the precursor slurry is obtained;

[0049] (2) Transfer the precursor slurry to the aging tank for aging for 5 hours, and then transfer it to the plate and frame filter press, and pass the sodium hydroxide hot solution twice to wash the SO adsorbed on the surface of the precursor particles. 4 2- , The fi...

Embodiment 2

[0054] A method for reducing the sulfur content of the precursor of the nickel-cobalt-manganese cathode material includes the following steps:

[0055] (5) Combine a nickel-cobalt-manganese metal mixed solution with a nickel content of 56.5g / L, a cobalt content of 18.8g / L, and a manganese content of 17.5g / L with 400g / L sodium hydroxide and 8% mass fraction of ammonia At the same time, it is transported to the reactor by a metering pump, and high-purity nitrogen is introduced into the reactor. The temperature in the reactor is controlled at 65~70℃, the pH is 11-11.5, and the ammonia value is within the range of 4-5g / L. After the particle size D50 of the precursor in the reactor reaches 10.5 microns, the precursor slurry is obtained;

[0056] (6) Transfer the precursor slurry to the aging tank for aging for 5 hours, and then transfer it to the plate and frame filter press, and pass the sodium hydroxide hot solution twice to wash the SO adsorbed on the surface of the precursor particl...

Embodiment 3

[0061] A method for reducing the sulfur content of the precursor of the nickel-cobalt-manganese cathode material includes the following steps:

[0062] (1) Combine a nickel-cobalt-manganese metal mixed solution with a nickel content of 77.94g / L, a cobalt content of 10.37g / L, and a manganese content of 5.27g / L with 400g / L sodium hydroxide and 8% mass fraction of ammonia At the same time, it is transported to the reactor by a metering pump, and high-purity nitrogen is introduced into the reactor, and then the temperature in the reactor is controlled at 65-70°C, the pH is 10.5-11, and the ammonia value is within the range of 2.5-5g / L. When the particle size D50 of the precursor in the reactor reaches 9 microns, the precursor slurry is obtained;

[0063] (2) Transfer the precursor slurry to the aging tank for aging for 2-12 hours, and then transport it to the plate and frame filter press, and pass the sodium hydroxide hot solution twice to wash the adsorbed on the surface of the precur...

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Abstract

The invention discloses a method for reducing the sulfur content of a nickel-cobalt-manganese positive electrode material precursor, which comprises the following steps: (1) preparing a precursor slurry: mixing a nickel-cobalt-manganese metal mixed solution with a complexing agent and a precipitant, and reacting to obtain the precursor slurry; (2) washing: aging the precursor slurry, carrying outfilter pressing, and washing again; (3) alkaline leaching: introducing the washed precursor slurry into an alkaline solution for soaking; and (4) washing with water: introducing the precursor slurry subjected to alkaline leaching into water for washing, drying, screening and demagnetizing to obtain the nickel-cobalt-manganese ternary positive electrode material precursor with the sulfur content ofless than or equal to 600ppm. According to the method, SO4 < 2-> in the NCM precursor is removed in a manner of combining multi-stage washing and alkali liquor soaking, SO4 < 2-> on the surfaces of precursor particles can be more effectively removed through multi-stage washing, and ammonium sulfate double salt crystals wrapped by the precursor particles can be dissolved and removed for a sufficient time through the alkali liquor soaking manner.

Description

Technical field [0001] The invention belongs to the field of battery materials, and specifically relates to a method for reducing the sulfur content of the precursor of a nickel-cobalt-manganese ternary cathode material. Background technique [0002] With the vigorous development of new energy vehicles, the requirements for the range, charging rate and safety of lithium-ion power batteries are getting higher and higher. As the most critical component of lithium-ion batteries, the cathode material determines the lithium-ion battery to a large extent. The energy density of the battery. As a commonly used traditional power battery cathode material, lithium iron phosphate has good safety performance, overcharge resistance and cycle stability. However, due to its shortcomings of low specific capacity and poor rate performance, it is gradually being used as a nickel-cobalt-manganese ternary cathode material. (NCM) replaced. [0003] At present, most manufacturers use the mixed sinterin...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006H01M4/505H01M4/525H01M10/0525C01P2006/10C01P2006/11C01P2004/61C01P2006/40C01P2006/80C01P2004/03H01M2004/028Y02E60/10
Inventor 廖折军蒋海荣宁亚东阮丁山李长东
Owner HUNAN BRUNP RECYCLING TECH
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