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Lithium ion battery cathode slurry, preparation method thereof, and lithium ion battery

A lithium-ion battery and positive electrode slurry technology, which is applied to battery electrodes, positive electrodes, secondary batteries, etc., can solve problems that do not involve improving the wettability of powder materials

Active Publication Date: 2021-02-12
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the invention does not involve a method for improving the wettability of powder, and further optimization is still needed

Method used

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  • Lithium ion battery cathode slurry, preparation method thereof, and lithium ion battery
  • Lithium ion battery cathode slurry, preparation method thereof, and lithium ion battery
  • Lithium ion battery cathode slurry, preparation method thereof, and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] This embodiment provides a method for preparing a positive electrode slurry for a lithium ion battery, the preparation method comprising the following steps:

[0066] (1) Mix the positive electrode active powder nickel cobalt lithium manganate and the conductive agent powder T300 carbon fiber, and obtain the first powder after degassing; the degassing process is carried out simultaneously with heating and vacuuming, and the heating temperature is 150°C , the absolute vacuum degree of vacuuming is 0.005Pa; the time of degassing treatment is 20min;

[0067] (2) Pass the humidity-promoting gas carbon dioxide with a gauge pressure of 0.5 MPa into the first powder, and obtain the second powder after adsorption saturation;

[0068] (3) Stirring at a rate of 300 rpm for 15 minutes to mix the second powder and N-methylpyrrolidone, and obtain an intermediate slurry after degassing treatment; the degassing treatment is carried out simultaneously with heating and vacuuming, and th...

Embodiment 2

[0073] This embodiment provides a method for preparing a positive electrode slurry for a lithium ion battery, the preparation method comprising the following steps:

[0074] (1) Mix the positive electrode active powder nickel cobalt lithium aluminate and the conductive agent powder T700 carbon fiber, and obtain the first powder after degassing treatment; the degassing treatment is carried out simultaneously with heating and vacuuming, and the heating temperature is 125°C , the absolute vacuum degree of vacuuming is 0.003Pa; the time of degassing treatment is 15min;

[0075] (2) The moisture-promoting gas ammonia whose gauge pressure is 0.25 MPa is passed into the first powder, and the second powder is obtained after adsorption saturation;

[0076] (3) Stirring at a rate of 200rpm for 12.5min to mix the second powder and N-methylpyrrolidone, and obtain an intermediate slurry after degassing; the degassing process is performed simultaneously by heating and vacuuming, and the hea...

Embodiment 3

[0081] This embodiment provides a method for preparing a positive electrode slurry for a lithium ion battery, the preparation method comprising the following steps:

[0082] (1) Mix the positive electrode active powder lithium iron phosphate and the conductive agent powder M30 carbon fiber, and obtain the first powder after degassing; the degassing process is heating and vacuuming at the same time, and the heating temperature is 175 ° C. The absolute vacuum degree of vacuum is 0.008Pa; the time of degassing treatment is 25min;

[0083] (2) The moisture-promoting gas formaldehyde with a gauge pressure of 0.75MPa is passed into the first powder, and the second powder is obtained after adsorption saturation;

[0084] (3) Mix the second powder and N-methylpyrrolidone at a rate of 400 rpm for 17.5 minutes, and obtain an intermediate slurry after degassing; the degassing process is performed simultaneously by heating and vacuuming, and the heating temperature is 95°C , the absolute...

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Abstract

The invention provides lithium ion battery cathode slurry, a preparation method thereof, and a lithium ion battery. The preparation method comprises the following steps: (1) mixing positive electrodeactive powder with conductive agent powder, and degassing to obtain first powder; (2) mixing the first powder with a wetting aid gas to obtain second powder; (3) mixing the second powder with a solvent, and degassing to obtain intermediate slurry; and (4) mixing the intermediate slurry with a binder to obtain the lithium ion battery positive electrode slurry. According to the preparation method provided by the invention, the wettability of the powder in the preparation process of the positive electrode slurry is improved, the wetting time is shortened, the production capacity is improved, andthe time cost is saved; and the lithium ion battery is high in energy density and excellent in electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a positive electrode slurry of a lithium ion battery, in particular to a positive electrode slurry of a lithium ion battery, a preparation method thereof and a lithium ion battery. Background technique [0002] The positive electrode stirring process is an important part of the lithium-ion battery production process, and the dispersion of the positive electrode slurry directly affects the cycle performance of the battery. In the oily cathode system, enhancing the wettability of the cathode powder is a very effective strategy. At present, the industry has realized the importance of wetting. Many R&D personnel improve the wettability of positive electrode powder through material modification or development of new processes, reduce wetting time, increase production capacity, and save time and cost. At present, most positive electrode powder production companies use the ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 李鸿辉刘荣江黄彬彬刘建华刘金成
Owner EVE ENERGY CO LTD
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