Mixing method of electrode slurry

A technology of electrode slurry and mixer, applied in mixing methods, mixers, mixers with rotating stirring devices, etc., can solve the problems of adequate mixing of electrode slurry and long mixing time, etc., so as to improve labor efficiency and improve High current discharge performance, overcome the effect of poor high current performance

Inactive Publication Date: 2007-07-04
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcoming of long electrode slurry mixing time and inability to fully mix electrode slurry in the prior art, and to provide an electrode slurry mixing method which has a short mixing time and can fully mix electrode slurry

Method used

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  • Mixing method of electrode slurry
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Examples

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Embodiment 1

[0027] This example is used to illustrate the electrode slurry mixing method provided by the present invention.

[0028]10 kg of lithium cobalt oxide, 0.5 kg of acetylene black, 4.0 kg of N-methylpyrrolidone (NMP), and 0.5 kg of polytetrafluoroethylene (PVDF) were stirred and mixed using a high-shear dispersing emulsifier as shown in Figure 1 to obtain lithium For the ion battery cathode slurry, the rotating speed of the rotor of the high-shear dispersing emulsifier is 2000 rpm, and the stirring time is 30 minutes.

Embodiment 2

[0030] This example is used to illustrate the electrode slurry mixing method provided by the present invention.

[0031] 10 kg of lithium cobalt oxide, 0.5 kg of acetylene black, 4.0 kg of N-methylpyrrolidone (NMP), and 0.5 kg of polytetrafluoroethylene (PVDF) were stirred and mixed for 60 minutes at a speed of 250 rpm in a conventional mixer to obtain a pre- The mixed electrode slurry 4 is then transferred to the high-shear dispersing emulsifier shown in Figure 1 for mixing, dispersing and refining to obtain dispersed and refined lithium-ion battery positive electrode slurry 4' , the rotor of the high-shear dispersing emulsifier first stirred at a speed of 1000 rpm for 10 minutes, and then stirred at a speed of 2000 rpm for 30 minutes.

Embodiment 3

[0033] This example is used to illustrate the electrode slurry mixing method provided by the present invention.

[0034] 10 kg of lithium cobalt oxide, 0.5 kg of acetylene black, 4.0 kg of N-methylpyrrolidone (NMP), and 0.5 kg of polytetrafluoroethylene (PVDF) were stirred and mixed for 40 minutes at a speed of 450 rpm in a conventional mixer to obtain the pre- The mixed electrode slurry 4 is then transferred to the high-shear dispersing emulsifier shown in Figure 1 for mixing, dispersing, and refining to obtain dispersed and refined lithium-ion battery positive electrode slurry 4', The high-shear dispersing emulsifier first stirred for 10 minutes at the rotor speed of the emulsifier at 1000 rpm, then stirred at 2000 rpm for 30 minutes, and then transferred the slurry to a vacuum mixer, at 200 rpm Stir at low temperature for 70 minutes, and at the same time reduce the temperature of the system to 30° C. with circulating cooling water to obtain a degassed lithium-ion battery po...

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Abstract

An electrode paste mixed method including used mixer mixing the materials of electrode paste composition, which, the said mixer is high shear spread emulsion machine, the said high shear spread emulsion machine including rotor, stator and motor, the said stator is outside of the rotor, the said rotor connect and drive by the electric machine. With the invention of the electrode paste mixed method can raise large current discharge battery performance, capacity and cycle performance, and significantly shorten the time of mixed electrode paste, has greatly enhanced the efficiency of labor.

Description

technical field [0001] The invention relates to a material mixing method, in particular to a mixing method of electrode slurry. Background technique [0002] At present, the mixing of lithium-ion battery electrode slurry is mainly carried out by conventional magnetic stirrer, mechanical stirrer and other mixing equipment with only a single mechanical stirring method, and the binder, solvent, conductive agent, active Material powder etc. are simply mechanically stirred and mixed to make a slurry. Obviously, this simple mechanical stirring cannot achieve sufficient mixing of the slurry, so that the uniformity of the slurry cannot be guaranteed, resulting in poor high-current discharge performance, low capacity and poor cycle performance of the manufactured battery. Moreover, it takes a long time to mix the slurry in this way, usually more than 6 hours. Contents of the invention [0003] The object of the present invention is to provide an electrode slurry mixing method whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F7/16B01F3/12H01M4/26
CPCY02E60/124Y02E60/10
Inventor 李亚宾
Owner BYD CO LTD
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