A kind of lithium ion battery negative electrode slurry and its preparation method and lithium ion battery

A lithium-ion battery and negative electrode slurry technology, which is applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve problems that do not involve improving the wettability of powder materials, and achieve enhanced ion/electron transmission capabilities, increased energy density, The effect of reducing the internal resistance of the battery

Active Publication Date: 2022-03-11
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 there is still a lot of room for improvement

Method used

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  • A kind of lithium ion battery negative electrode slurry and its preparation method and lithium ion battery
  • A kind of lithium ion battery negative electrode slurry and its preparation method and lithium ion battery
  • A kind of lithium ion battery negative electrode slurry and its preparation method and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] This embodiment provides a figure 1 The preparation method of the negative electrode slurry of lithium ion battery shown, described preparation method comprises the following steps:

[0069] (1) Mix negative electrode active powder material KS-6 artificial graphite and conductive agent powder material T300 carbon fiber, obtain the first powder material after degassing treatment; described degassing treatment is to carry out heating and vacuumizing simultaneously, and the temperature of heating is 150 ℃ , the absolute vacuum degree of vacuuming is 0.005Pa; the time of degassing treatment is 20min;

[0070] (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;

[0071] (3) Stir at a rate of 300 rpm for 15 minutes to mix the second powder and deionized water, and obtain an intermediate slurry after degassing treatment; the degassing treatment is carried out at th...

Embodiment 2

[0076] This embodiment provides a figure 1 The preparation method of the negative electrode slurry of lithium ion battery shown, described preparation method comprises the following steps:

[0077] (1) Mix negative electrode active powder material KS-15 artificial graphite and conductive agent powder material T700 carbon fiber, obtain the first powder material after degassing treatment; described degassing treatment is to carry out heating and vacuumizing simultaneously, and the temperature of heating is 125 ℃ , the absolute vacuum degree of vacuuming is 0.003Pa; the time of degassing treatment is 15min;

[0078] (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;

[0079] (3) Stirring at a rate of 200rpm for 12.5min to mix the second powder and deionized water, and obtain an intermediate slurry after degassing; The absolute vacuum degree of vacuum is 0.025Pa; ...

Embodiment 3

[0084] This embodiment provides a figure 1 The preparation method of the negative electrode slurry of lithium ion battery shown, described preparation method comprises the following steps:

[0085] (1) Mix negative electrode active powder material SFG-6 artificial graphite and conductive agent powder material M30 carbon fiber, obtain the first powder material after degassing treatment; described degassing treatment is to carry out heating and vacuumizing simultaneously, and the temperature of heating is 175 ℃ , the absolute vacuum degree of vacuuming is 0.008Pa; the time of degassing treatment is 25min;

[0086] (2) passing the moisture-promoting gas chlorine gas with a gauge pressure of 0.75MPa into the first powder, and obtaining the second powder after adsorption saturation;

[0087] (3) Stirring at a rate of 400rpm for 17.5min to mix the second powder and deionized water, and obtain an intermediate slurry after degassing; The absolute vacuum degree of vacuum is 0.075Pa; th...

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Abstract

The invention provides a lithium ion battery negative electrode slurry and a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: (1) mixing the negative electrode active powder and the conductive agent powder, and obtaining the first powder after degassing treatment (2) mixing the first powder and the humidity-promoting gas to obtain the second powder; (3) mixing the second powder and the solvent to obtain an intermediate slurry after degassing; (4) mixing the intermediate slurry, dispersing agent and binder to obtain lithium ion battery negative electrode slurry. The preparation method provided by the invention improves the wettability of the powder in the negative electrode slurry preparation process, reduces the wetting time, improves the production capacity, and saves time and cost; the lithium ion battery has high energy density and excellent electrochemical performance .

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a negative electrode slurry of a lithium ion battery, in particular to a negative electrode slurry of a lithium ion battery, a preparation method thereof and a lithium ion battery. Background technique [0002] The negative electrode stirring process is an important part of the lithium-ion battery production process, and the dispersion of the negative electrode slurry directly affects the cycle performance of the battery. In aqueous anode systems, enhancing the wettability of graphite (or conductive agent) powder is a very effective strategy. At present, the industry has realized the importance of wetting. Many R&D personnel improve the wettability of graphite (or conductive agent) powder through material modification or development of new processes, reduce wetting time, increase production capacity, and save time and cost. [0003] Many graphite (or conductive agent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587H01M4/62H01M10/0525
CPCH01M4/625H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 李鸿辉黄彬彬刘荣江吕鑫祝媛刘建华刘金成
Owner EVE ENERGY CO LTD
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