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Mixing method of electrode slurry

A technology of electrode slurry and mixer, which is applied in the direction of mixing methods, mixers, mixers with rotating stirring devices, etc., can solve the problems of long mixing time and insufficient mixing of electrode slurry, so as to improve the performance of high-current discharge , Improve labor efficiency, shorten the effect of mixing time

Inactive Publication Date: 2010-12-08
BYD CO LTD
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  • Summary
  • 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
  • Mixing method of electrode slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0028] use as figure 1 The high-shear dispersing and emulsifying machine shown stirs and mixes 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) to obtain a cathode slurry for lithium-ion batteries material, 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- Mixed electrode slurry 4, then transfer the slurry 4 to such as figure 1 Mix, disperse and refine in the shown high-shear dispersing emulsifier to obtain dispersed and refined lithium-ion battery cathode slurry 4'. The rotor of the high-shear dispersing emulsifier first rotates at a speed of 1000 rpm Stir for 10 minutes, then 30 minutes at 2000 rpm.

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- Mixed electrode slurry 4, then transfer the slurry 4 to such as figure 1 The high-shear dispersing emulsifier shown in the figure performs mixing, dispersing, and refinement to obtain dispersed and refined lithium-ion battery positive electrode slurry 4'. The high-shear dispersing emulsifier first operates at a rotor speed of 1000 rpm Stir for 10 minutes at 2000 rpm, then 30 minutes at 2000 rpm, then transfer the slurry to a vacuum mixer and stir for 70 minutes at 200 rpm, while reducing the temperature of the system to 30°C with circulating cooling water. The degassed lithium ion battery positive electrode slurry is o...

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