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Method for reducing residual alkali of high-nickel ternary material of lithium ion battery

A technology of high-nickel ternary materials and lithium-ion batteries, applied in electrical components, battery electrodes, secondary batteries, etc., can solve problems such as clogging pipes, reducing solid content, and attenuation of electrochemical performance of high-nickel ternary materials

Pending Publication Date: 2021-09-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high solid content of 62.5% to 71.4% brings a large load to the stirring and washing equipment, which not only easily damages the equipment and blocks the pipeline, but also leads to poor effect of reducing the residual alkali of the material, so the water consumption has to be increased to reduce the solid content
So far, the contradiction between reducing the solid content of the washing slurry and inhibiting the electrochemical performance decay of high-nickel ternary materials has not been well resolved

Method used

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  • Method for reducing residual alkali of high-nickel ternary material of lithium ion battery
  • Method for reducing residual alkali of high-nickel ternary material of lithium ion battery
  • Method for reducing residual alkali of high-nickel ternary material of lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0042] (1) Configure mixed washing solution: add 5kg deionized water and 5kg ether (mass ratio 1:1) into a 25L reactor and stir evenly;

[0043] (2) 10 kg of high-nickel ternary material (Li 1.05 Ni 0.8 co 0.1 mn 0.1 o 2 ) was added into a reaction kettle equipped with a mixed washing solution for washing, filtered after washing for 30 minutes, and dried at 100° C. for 5 hours to obtain an intermediate product;

[0044] (3) the intermediate product that step (2) obtains is in O 2 The sintering treatment is carried out in the atmosphere, the calcination temperature is 700°C, and the calcination time is 3h. After the sintering is completed, the obtained sintered product is cooled with the furnace, crushed, and sieved to obtain the NCM811 material with low residual alkali. The content of LiOH, Li 2 CO 3 content and Li content are listed in Table 1.

[0045] Measure its XRD spectrogram to the NCM811 material that the embodiment of the present invention 1 obtains, and measur...

Embodiment 2

[0048] (1) Configure mixed washing solution: add 5kg deionized water and 15kg cyclohexane (mass ratio 1:3) into a 25L reactor and stir evenly;

[0049] (2) 10kg of high-nickel ternary material (Li 1.02 Ni 0.6 co 0.2 mn 0.2 o 2 ) was added into a reaction kettle equipped with a mixed washing solution for washing, filtered after washing for 60 minutes, and dried at 120° C. for 5 hours to obtain an intermediate product;

[0050] (3) the intermediate product that step (2) obtains is in O 2 The sintering treatment is carried out in the atmosphere, the calcination temperature is 800°C, and the calcination time is 10h. After the sintering is completed, the obtained sintered product is cooled with the furnace, crushed, and sieved to obtain the NCM622 material with low residual alkali. The content of LiOH, Li 2 CO 3 content and Li content are listed in Table 1.

Embodiment 3

[0052] (1) Configure mixed washing liquid: add 10kg deionized water and 10kg benzene (mass ratio 1:2) into a reaction kettle with a volume of 25L and stir evenly;

[0053] (2) 10 kg of high-nickel ternary material (Li 1.1 Ni 0.9 co 0.05 mn 0.05 o 2 ) was added into a reaction kettle equipped with a mixed washing solution for washing, filtered after washing for 5 minutes, and dried at 100° C. for 5 hours to obtain an intermediate product;

[0054] (3) the intermediate product that step (2) obtains is in O 2 The sintering treatment is carried out in the atmosphere, the sintering temperature is 500°C, and the sintering time is 5h. After the sintering is completed, the obtained sintered product is cooled with the furnace, crushed, and sieved to obtain the NCM955 material with low residual alkali. The content of LiOH, Li 2 CO 3 content and Li content are listed in Table 1.

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Abstract

The invention relates to a method for reducing residual alkali of a high-nickel ternary material of a lithium ion battery. The method comprises the following steps: (1) providing a washing solution, wherein the washing solution comprises water and an organic solvent which is immiscible with the water; (2) washing the high-nickel ternary material of the lithium ion battery by using the washing solution, filtering and drying to obtain an intermediate; and (3) roasting the intermediate in O2 atmosphere to obtain the positive electrode material with low residual alkali value. The method not only reduces the residual alkali value of the high-nickel ternary material, but also improves the electrochemical cycle performance of the material.

Description

technical field [0001] The invention belongs to the field of preparation of positive electrode materials of lithium ion batteries, in particular to a method for reducing residual alkali of high-nickel ternary materials of lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, light weight, no memory effect, and high energy conversion efficiency. They are the core components of electric vehicles. The positive electrode material is the most important part of the power battery, because the discharge specific capacity and discharge voltage of the positive electrode material directly determine the energy density of the lithium-ion battery, and its cost accounts for 30% to 40% of the battery cost. In recent years, the number of electric vehicles has increased rapidly, but compared with traditional fuel vehicles, electric vehicles still have a relatively large disadvantage in terms of driving range. At...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李刚戴仲葭杜泽学宗保宁
Owner CHINA PETROLEUM & CHEM CORP
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