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Novel stirring process for positive electrode slurry of lithium ion battery

A technology for lithium ion battery and cathode slurry, which is applied in the directions of dissolution, chemical instruments and methods, mixing methods, etc., can solve the problems of accelerated equipment loss, shortened service life, uneven mixing of slurry, etc., so as to reduce loss and prolong use. Longevity and effect of improving dispersion uniformity

Inactive Publication Date: 2018-10-09
SHENZHEN GPC ENERGY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the stirring process of the above two methods, the dispersion effect of active materials and conductive agents using "wet mixing" is not ideal, because the conductive agent is very light and difficult to disperse, and it is easy to agglomerate, resulting in poor mixing of the slurry. Uniform, using "dry mixing" although the material dispersion effect is ideal, but the loss of equipment will be accelerated, resulting in shortened service life

Method used

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  • Novel stirring process for positive electrode slurry of lithium ion battery
  • Novel stirring process for positive electrode slurry of lithium ion battery
  • Novel stirring process for positive electrode slurry of lithium ion battery

Examples

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Effect test

Embodiment 1

[0018] In the embodiment of the present invention, a novel lithium-ion battery positive electrode slurry stirring process, the specific steps are as follows:

[0019] (1) Preparation of conductive glue: use a disperser to pre-prepare the binder, solvent, and conductive agent powder into conductive glue according to a certain ratio;

[0020] (2) Active material infiltration: Mix the active material and NMP in a mixer with double revolution and rotation shafts, rotate clockwise at low speed for 10 minutes at a speed of 15 rpm, and then rotate counterclockwise for 10 minutes at a speed of 15 rpm to fully disperse the conductive agent in the active material. in the substance;

[0021] (3) Forward and reverse stirring at low speed at room temperature: sieve the prepared conductive glue with three layers of 600-mesh screens, add 1 / 2 of the sieved conductive glue into the mixer, rotate at a low speed of 300rpm, and rotate The rotation speed is 15rpm, the time is 10min, and finally t...

Embodiment 2

[0025] In the embodiment of the present invention, a novel lithium-ion battery positive electrode slurry stirring process, the specific steps are as follows:

[0026] (1) Preparation of conductive glue: use a disperser to pre-prepare the binder, solvent, and conductive agent powder into conductive glue according to a certain ratio;

[0027] (2) Active material infiltration: Mix the active material and NMP in a mixer with double revolution and rotation shafts, rotate clockwise at a low speed for 20 minutes at a speed of 20 rpm, and then rotate counterclockwise for 20 minutes at a speed of 20 rpm to fully disperse the conductive agent in the active material. in the substance;

[0028] (3) Forward and reverse stirring at low speed at room temperature: sieve the prepared conductive glue with three layers of 600-mesh screens, add 1 / 2 of the sieved conductive glue into the mixer, rotate at a low speed of 400rpm, and rotate The rotation speed is 20rpm, the time is 20min, and finally...

Embodiment 3

[0032] In the embodiment of the present invention, a novel lithium-ion battery positive electrode slurry stirring process, the specific steps are as follows:

[0033] (1) Preparation of conductive glue: use a disperser to pre-prepare the binder, solvent, and conductive agent powder into conductive glue according to a certain ratio;

[0034] (2) Active material infiltration: Mix the active material and NMP in a mixer with double revolution and rotation shafts, rotate clockwise at low speed for 30 minutes at a speed of 25 rpm, and then rotate counterclockwise for 30 minutes at a speed of 25 rpm to fully disperse the conductive agent in the active material. in the substance;

[0035] (3) Normal temperature and low speed forward and reverse stirring: sieve the prepared conductive glue with three layers of 600-mesh screens, add 1 / 2 of the sieved conductive glue into the mixer, rotate at a low speed of 500rpm, and rotate The rotation speed is 25rpm, the time is 30min, and finally t...

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PUM

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Abstract

The invention discloses a novel stirring process for the positive electrode slurry of a lithium ion battery. The process comprises the following steps: (1) preparation of conductive glue liquid; (2) infiltration of active substances; (3) normal-temperature low-speed forward and backward stirring; (4) vacuum high-speed stirring; and (5) adjustment of slurry viscosity and solid content and blankingto prepare the positive electrode slurry of the lithium ion battery. Compared with conventional wet mixing and dry mixing, the novel stirring process of the invention of the invention has the beneficial effects that the novel stirring process integrates the advantages of l wet mixing and dry mixing to a certain extent, and can improve the dispersion uniformity of the positive electrode slurry of the lithium ion battery, reduce the loss of stirring equipment and prolong the service life of the equipment.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery preparation, and in particular relates to a novel lithium-ion battery anode slurry stirring process. Background technique [0002] In the production process of lithium-ion batteries, the batching of positive and negative electrodes is one of the most important processes. The quality of the slurry obtained from the batching will directly affect the capacity, internal resistance, voltage drop and other properties of the finished battery. At present, there are two mainstream methods in the lithium-ion battery industry. One is to prepare the glue solution according to a certain ratio of the binder and the solvent, then add the conductive agent in sequence according to the ratio, and then add the active material in the mixer according to a certain ratio. Stir at a certain stirring rate to prepare the required slurry, which is collectively referred to as "wet mixing" in the industry. The oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F3/12
CPCB01F23/51B01F23/59B01F23/53
Inventor 黄锐升刘小虹李国敏
Owner SHENZHEN GPC ENERGY GRP CO LTD
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