Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method of positive electrode slurry of lithium ion battery

A lithium-ion battery and positive electrode slurry technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of long time consumption, personnel investment, and demanding time investment, and achieve fewer operating procedures and shorten the mixing process time , The effect of high capacity retention

Active Publication Date: 2021-09-17
余姚市海泰贸易有限公司
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Chinese invention patent with the application number CN201711095904.7 discloses a wet homogenization process for positive electrodes of lithium-ion batteries, which uses polyvinylidene fluoride (PVDF) as a binder, and N_methylpyrrolidone (NMP) As a dispersant, at the same time, appropriate addition of surfactant improves the uniformity and dispersion stability of the battery slurry, but this solution still takes a long time, and the addition process has a lot of dust on the operator's body The health status has a great impact, and as the amount of cutting material increases, the problem of demanding personnel investment and time investment

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of positive electrode slurry of lithium ion battery
  • A kind of preparation method of positive electrode slurry of lithium ion battery
  • A kind of preparation method of positive electrode slurry of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take LPF / PVDF / SP / NMP system pulping as an example (5L mixer / dispersing turntable diameter 50mm)

[0031] Step 1: Add all dry powders (LPF, SP, PVDF) in order, rotate forward at 50rpm / disperse at 2.7m / s; stir for 30-60min;

[0032] Step 2: Add an appropriate amount of NMP to wet the powder particles, so that the surface of the particles absorbs the solvent, so that the solid content is 70%, reverse revolution 60rpm / dispersion 3.9m / s; stir for 30-60min, every 15min during the stirring process Monitor the appearance of the slurry, if there is loose sand, stop stirring in time and go to the next step;

[0033] Step 3: Continue to add NMP so that the solid content is 60%, rotate forward at 80rpm / disperse at 6.5m / s; stir for 60-90min; after the stirring is completed, scrape off the lumpy slurry attached to the stirring paddle;

[0034] The fourth step: continue to add NMP, dilute the slurry, adjust the viscosity to make it suitable for the coating process, so that the solid ...

Embodiment 2

[0037] Take LPF / PVDF / SP / NMP system pulping as an example (5L mixer / dispersing turntable diameter 50mm)

[0038] Step 1: Add all dry powders (LPF, SP, PVDF) in order, rotate forward at 50rpm / disperse at 2.7m / s; stir for 30-60min;

[0039] Step 2: Add an appropriate amount of NMP to wet the powder particles, so that the surface of the particles absorbs the solvent, so that the solid content is 73%, reverse revolution 60rpm / dispersion 3.9m / s; stir for 30-60min, every 15min during the stirring process Monitor the appearance of the slurry, if there is loose sand, stop stirring in time and go to the next step;

[0040] Step 3: Continue to add NMP so that the solid content is 60%, rotate forward at 80rpm / disperse at 6.5m / s; stir for 60-90min; after the stirring is completed, scrape off the lumpy slurry attached to the stirring paddle;

[0041] The fourth step: continue to add NMP, dilute the slurry, adjust the viscosity to make it suitable for the coating process, so that the solid ...

Embodiment 3

[0045] Take LPF / PVDF / SP / NMP system pulping as an example (5L mixer / dispersing turntable diameter 50mm)

[0046] Step 1: Add all dry powders (LPF, SP, PVDF) in order, rotate forward at 50rpm / disperse at 2.7m / s; stir for 30-60min;

[0047] Step 2: Add an appropriate amount of NMP to wet the powder particles, so that the surface of the particles absorbs the solvent, so that the solid content is 75%, reverse revolution 60rpm / dispersion 3.9m / s; stir for 30-60min, every 15min during the stirring process Monitor the appearance of the slurry, if there is loose sand, stop stirring in time and go to the next step;

[0048] Step 3: Continue to add NMP so that the solid content is 65%, rotate forward at 80rpm / disperse at 6.5m / s; stir for 60-90min; after the stirring is completed, scrape off the lumpy slurry attached to the stirring paddle;

[0049] The fourth step; continue to add NMP, dilute the slurry, adjust the viscosity to make it suitable for the coating process, so that the solid ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for preparing positive electrode slurry of a lithium ion battery. The slurry is prepared by using a dry-blending pulping process. On the premise of reducing equipment and time investment, a new dry-blending process route is applied to avoid slurry agglomeration and high The problem of slurry deposition in the viscosity stage enables the solid phase to be uniformly and stably dispersed in the solvent; and under the premise of ensuring the best performance of the slurry, the preparation of a pot of slurry can be completed within the optimal time.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery preparation, in particular to a method for preparing lithium ion battery cathode slurry. Background technique [0002] With the development of science and technology and the advancement of lithium-ion battery preparation technology, the preparation process of lithium-ion batteries is becoming more and more mature, and the quality of details is becoming more and more important. The homogenization of lithium-ion batteries is a key link in the production of lithium-ion batteries. The homogenization process is mainly to mix active materials, binders, conductive agents and other components into a uniform suspension. The key to homogenization is how to mix the slurry with The components of the homogenate are dispersed evenly, and the homogenization process needs to be optimized in order to achieve this goal. In the positive and negative electrode slurries, the dispersion and uniformity of g...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/623H01M4/625H01M10/0525Y02E60/10
Inventor 周海峰娄忠良
Owner 余姚市海泰贸易有限公司