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Novel efficient cathode pulp wet-method preparation process

A negative electrode slurry and preparation technology, which is applied in the direction of electrode manufacturing, battery electrodes, electrical components, etc., can solve the problems of unfavorable production capacity improvement, production efficiency improvement, long time consumption, and many preparation steps, etc., to achieve homogenization and stirring The effect of process simplification, improvement of production efficiency and simplification of process steps

Inactive Publication Date: 2018-06-01
ZHENGZHOU BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Patent CN102790218A "A Lithium-ion Battery Negative Electrode Slurry Preparation Process" adopts the method of adding all the glue first and then adding the negative electrode active material (low viscosity to high viscosity) step by step to prepare the negative electrode slurry; patent CN106784609A "A Lithium Battery Negative Electrode Slurry preparation process"The negative electrode slurry is prepared by adding graphite and conductive agent mixed powder first, and then adding glue step by step (high viscosity to low viscosity stirring); these two homogenization processes have many steps and take a long time , usually more than 4-7 hours
[0004] Today's lithium battery industry is growing rapidly, and the investment in raw materials is getting higher and higher. Therefore, it is an effective way to reduce costs by greatly improving production efficiency and producing more batteries per unit time. More than 4 hours or more, these two processes take a long time, which is not conducive to the improvement of production capacity and production efficiency

Method used

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  • Novel efficient cathode pulp wet-method preparation process
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Prepare a CMC aqueous solution with a solid content of 1%: A certain amount of CMC and deionized water are stirred at high speed for 90 minutes, then stirred at a medium speed for 30 minutes, and then a CMC solution with uniform dispersion and stable properties can be obtained, wherein the CMC and deionized water Deionized water is calculated by mass percentage: CMC is 1%, deionized water is 99%;

[0026] (2) Take 10% of the CMC solution in step (1), mix it with the negative electrode active material and add it to the planetary mixer, and stir it for 10 minutes;

[0027] (3) Take 40% of the CMC solution in step (1) and add it to the planetary mixer, and stir for 20 minutes;

[0028] (4) Add the remaining 50% of the CMC solution to the planetary mixer, add NMP and SBR solutions in turn, and then revolve and stir for 40 minutes to prepare a negative electrode slurry with a solid content of 50%.

[0029] Wherein, in the step (2), the revolution speed is adjusted to 30...

Embodiment 2

[0035] A new high-efficiency negative electrode slurry wet preparation process is characterized in that it includes the following steps:

[0036] (1) Prepare a CMC aqueous solution with a solid content of 1.5%: A certain amount of CMC and deionized water are stirred at high speed for 90 minutes, then stirred at a medium speed for 30 minutes, and then a CMC solution with uniform dispersion and stable properties can be obtained, wherein the CMC and deionized water Deionized water is calculated by mass percentage: CMC is 1.5%, deionized water is 98.5%;

[0037] (2) Take 15% of the CMC solution in step (1), mix it with all the negative active materials and add it to the planetary mixer, and stir for 25 minutes;

[0038] (3) Take 50% of the CMC solution in step (1) and add it to the planetary mixer, and stir for 35 minutes;

[0039] (4) Add the remaining 35% CMC solution to the planetary mixer, and add NMP and SBR solutions in turn, and then revolve and stir for 80 minutes to prep...

Embodiment 3

[0046] A new high-efficiency negative electrode slurry wet preparation process is characterized in that it includes the following steps:

[0047] (1) Prepare a CMC aqueous solution with a solid content of 2%: A certain amount of CMC and deionized water are stirred at high speed for 90 minutes, then stirred at a medium speed for 30 minutes, and then a CMC solution with uniform dispersion and stable properties can be obtained. Deionized water is calculated by mass percentage: CMC is 2%, deionized water is 98%;

[0048] (2) Take 20% of the CMC solution in step (1), mix it with the negative electrode active material, add it to the planetary mixer, and stir it for 40 minutes;

[0049] (3) Take 60% of the CMC solution in step (1) and add it to the planetary mixer, and stir for 20 minutes to 60 minutes;

[0050] (4) Add the remaining 20% ​​CMC solution to the planetary mixer, and add NMP and SBR solutions in turn, and then revolve and stir for 120 minutes to prepare a negative elect...

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Abstract

The invention provides a novel efficient cathode pulp wet-method preparation process which comprises the following steps: (1) preparing a CMC (Carboxy Methyl Cellulose) solution of which the solid content is 1-2%; (2) mixing 10-20% of the CMC solution of the step (1) with a cathode active material, putting into a planet stirring machine, and performing revolution stirring for 10-40 minutes; (3) putting 40-60% of the CMC solution of the step (1) into the planet stirring machine, and performing revolution stirring for 20-60 minutes; (4) putting the rest CMC solution into the planet stirring machine, sequentially adding an NMP (METHYL PYRROLIDONE) solution and an SBR (Butadiene Styrene Rubber) solution, and performing revolution stirring for 40-120 minutes, thereby obtaining cathode pulp of which the solid content is 50-60%. The process has the advantages that cathode pulp can be homogenized within a relatively short time, and the homogenization production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a novel high-efficiency negative electrode slurry wet preparation process. Background technique [0002] With the development of society and the improvement of people's requirements for environmental protection, lithium-ion batteries with high energy density and environmental protection are more and more used in people's lives. However, the continuous production of new lithium-ion battery factories and the expansion of production by established enterprises have also made the competition in this industry more and more fierce. [0003] Patent CN102790218A "A Lithium-ion Battery Negative Electrode Slurry Preparation Process" adopts the method of adding all the glue first and then adding the negative electrode active material (low viscosity to high viscosity) step by step to prepare the negative electrode slurry; patent CN106784609A "A Lithium Battery Negative Electrode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1393H01M10/0525
CPCH01M4/04H01M4/1393H01M10/0525Y02E60/10
Inventor 李平义许亚威任帅隆
Owner ZHENGZHOU BAK BATTERY CO LTD