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Electrode slurry dispersing method

An electrode slurry and dispersion technology, which is applied in the direction of mixing methods, electrode manufacturing, chemical instruments and methods, etc., can solve the problems of poor uniformity of slurry, large volume, and unfavorable electrochemical performance of batteries, so as to improve electrochemical performance, Good coating uniformity and the effect of eliminating particle agglomeration

Inactive Publication Date: 2009-03-18
SHENZHEN BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method is very simple and easy to operate, it is difficult to distribute the components in the electrode slurry evenly, and the slurry located in the dead corner cannot even be stirred at all, nor can the particle agglomeration be completely eliminated.
figure 1 It is a scanning electron microscope photo of the negative electrode slurry of our company's 053448 battery that is mechanically stirred by paddles. A, B, and C in the figure are obvious cavities, and some cavities are deep and large, indicating that the slurry The uniformity of material dispersion is poor, which is detrimental to the electrochemical performance of the battery

Method used

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Examples

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Effect test

Embodiment 1

[0022] Use a mixing bucket with stirring blades to disperse the negative electrode slurry of the company's 053448 battery, and the motor drives the stirring blades of the mixing bucket to stir the negative electrode slurry in the bucket for 5 hours; then place the stirred negative electrode slurry in ultrasonic dispersion Ultrasonic dispersion treatment was carried out in the machine, the ultrasonic frequency was 50MHz, and the temperature of the negative electrode slurry was kept at 30°C during the ultrasonic dispersion treatment. After 2 hours of ultrasonic dispersion treatment, the negative electrode slurry after ultrasonic dispersion treatment was coated on an aluminum foil with a thickness of 16 μm.

[0023] The above-mentioned aluminum foil coated with negative electrode slurry is dried, and the negative electrode slurry layer is subjected to SEM analysis, figure 2 For the obtained SEM photographs. Compared with the comparative example, figure 2 There is no such thing...

Embodiment 2

[0028] According to Example 1, the negative electrode slurry of the 053448 model battery is dispersed, and the difference from the dispersion process of Example 1 is that the stirring time of the negative electrode slurry in the mixing tank is 2h; the ultrasonic frequency is 21MHz; During the treatment, the temperature of the negative electrode slurry was kept at 35° C.; the ultrasonic dispersion treatment time was 15 minutes.

[0029] The negative electrode slurry after the dispersion treatment is measured and calculated according to Example 1, and the average value of the negative electrode slurry surface density on each row of samples is 21.539mg / cm 2 , with a standard deviation of 0.162.

Embodiment 3

[0031] According to Example 1, the negative electrode slurry of the 053448 model battery is dispersed, and the difference with the dispersion treatment process of Example 1 is that the stirring time of the negative electrode slurry in the mixing tank is 12h; the ultrasonic frequency is 60MHz; During the treatment, the temperature of the negative electrode slurry was maintained at 40° C.; the ultrasonic dispersion treatment time was 6 h.

[0032] The negative electrode slurry after the dispersion treatment is measured and calculated according to Example 1, and the average value of the negative electrode slurry surface density on each row of samples is 21.613mg / cm 2 , with a standard deviation of 0.143.

[0033] Comparing the standard deviation data of the surface density of the negative electrode slurry on the samples in each embodiment and the comparative example shows that, compared with the comparative examples, after the negative electrode slurry is carried out mechanical s...

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Abstract

The invention provides a dispersion method of electrode paste, which adopts ultrasonic waves to conduct dispersion treatment for the electrode paste. When adopting the dispersion treatment of ultrasonic waves for the electrode paste, particle agglomerations in the electrode paste can be eliminated through utilizing the cavitation effect of the ultrasonic waves, and the dispersion is even, and dispersion dead angles do not exist through adopting the dispersion treatment of ultrasonic waves. A coat with excellent evenness can be obtained after coating the electrode paste which is conducted with the dispersion treatment of ultrasonic waves, thereby being beneficial for increasing the electrochemical property of batteries.

Description

technical field [0001] The invention relates to a dispersion method of a solid-liquid mixed system, in particular to an electrode slurry dispersion method capable of improving the dispersion consistency of the electrode slurry. Background technique [0002] In the manufacturing process of lithium-ion batteries, the uniformity and consistency of the electrode slurry greatly affects the electrochemical performance of the battery. Dispersion systems are essentially thermodynamically unstable systems, and it is not easy to ensure the stable and uniform dispersion of solid phase materials in liquid phase dispersion media. [0003] Taking the aqueous negative electrode slurry of lithium-ion batteries as an example, it is a multi-component dispersion system, in which the dispersed phase is solid phase materials such as graphite and conductive agent, and the dispersion medium is a liquid phase composed of water, CMC and SBR. Graphite is a non-polar substance, which is not easy to a...

Claims

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Application Information

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IPC IPC(8): H01M4/04B01F11/02B01F3/12B01F13/10
CPCY02E60/10
Inventor 刘付勇唐赞谦张华
Owner SHENZHEN BAK BATTERY CO LTD
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