Homogenizing method of lithium ion battery positive electrode slurry

A lithium-ion battery, cathode slurry technology, applied in battery electrodes, positive electrodes, mixing methods, etc., can solve the problems of uneven mixing, cumbersome operation steps, large fluctuations in discharge viscosity, etc., to improve dispersion uniformity, Improve the homogenization efficiency and the effect of improving the homogenization efficiency

Pending Publication Date: 2020-09-08
余姚市海泰贸易有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: the time from feeding to discharging is more than 10 hours, the production efficiency and equipment utilization rate are very low. In mass production, it is necessary to purchase a large number of mixers to meet the production capacity requirements, so the equipment input cost and floor space are also very high. Big
However, this homogenization method has the following disadvantages: (1) The operation steps are cumbersome, and there are at least 15 times of operations such as feeding and parameter setting, and employees are prone to make mistakes in operation, which is not conducive to the use in normal mass production; (2) the bonding The agent is divided into two forms of powder and glue, and the method of adding multiple times is adopted; the requirements for the equipment measurement system are extremely high, and the cumulative error in the process will gradually increase, resulting in a deviation bet

Method used

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  • Homogenizing method of lithium ion battery positive electrode slurry
  • Homogenizing method of lithium ion battery positive electrode slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Take by weight 97 parts of NCM powder, 1 part of Super-P powder (as conductive agent), 1.5 parts of PVDF powder (as binder), 0.5 part of slurry containing CNT (as conductive agent), and adopt the present invention The batching process prepares the positive electrode slurry, and the specific steps are as follows:

[0076] Step 1: Add 97 parts of NCM powder, 1 part of Super-P powder, and 1.5 parts of PVDF powder into the double planetary mixer, turn on the revolution 13-17r / min, rotate 300-500r / min, and stir for 30min.

[0077] Step 2: Add the slurry containing 0.5 part of CNT and 50% NMP into the mixer, turn on the revolution at 15-17r / min, rotate at 300-500r / min, and stir for 60min.

[0078] Step 3: Transport the slurry in step 2 and 50% NMP to an impeller-type high-speed mixer with a rotation speed of 5000r / min by a screw according to a fixed flow rate. After mixing, put the slurry into the circulation tank A for 30-60 minutes.

[0079] Step 4: Turn on the mixer at a ...

Embodiment 2

[0082] Weigh 97 parts of LFP powder by mass fraction, 0.5 part of Super-P powder (as conductive agent), 1.8 parts of PVDF powder (as binder), 0.7 part of slurry containing CNT (as conductive agent), and adopt the present invention The batching process prepares the positive electrode slurry, and the specific steps are as follows:

[0083] Step 1: Add 97 parts of LFP powder, 0.5 parts of Super-P powder, and 1.8 parts of PVDF powder into the double planetary mixer, turn on the revolution 13-17r / min, rotate 300-500r / min, and stir for 30min.

[0084] Step 2: Add 0.7 parts of CNT-containing slurry and 70% NMP into the mixer, turn on the revolution at 15-17r / min, rotate at 300-500r / min, and stir for 60min.

[0085] Step 3: Transport the slurry in step 2 and 30% NMP to an impeller-type high-speed mixer with a rotation speed of 5000 r / min by a screw according to a fixed flow rate, and pour the slurry into the circulation tank A for 30-60 minutes.

[0086] Step 4: Turn on the mixer at ...

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Abstract

The invention provides a homogenizing method of a lithium ion battery positive electrode slurry. The method comprises the following steps of: S1, feeding a positive active substance, conductive agentdry powder and binder dry powder into a double-planet stirrer one by one according to a ratio by using an automatic feeding system, and carrying out powder premixing to obtain a dry powder mixture; S2, dividing a solvent into two parts, adding a conductive agent slurry and one part of a solvent into the dry powder mixture prepared in S1 in proportion, and conducting first mixing to obtain a semi-finished product slurry; S3, starting a high-speed mixer, inputting the semi-finished product slurry obtained in S2 and another part of solvent into the high-speed mixer for high-speed mixing and dispersing, and pumping the mixed slurry into a circulation tank A; S4, inputting the slurry in the circulation tank A into the high-speed mixer again for high-speed mixing and dispersing, and pumping themixed slurry into a circulation tank B. The double-planet stirrer and the high-speed mixer are used at the same time, the slurry dispersion uniformity can be improved, and the slurry granularity consistency is better.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery production and manufacturing, and in particular relates to a method for homogenizing lithium ion battery cathode slurry. Background technique [0002] As hot topics such as energy conservation and emission reduction and environmental protection continue to ferment, new energy vehicle technology has developed rapidly in the past two years, and major OEMs have rapidly deployed in the field of new energy vehicles. One's lithium-ion power battery is also developing rapidly. In the past two years, the production capacity of major power battery factories has made great breakthroughs. In this competitive environment, reducing costs and increasing efficiency has become a hot topic in the power battery industry. [0003] In the production and manufacture of lithium-ion power batteries, homogenization is the first process, which not only directly determines the performance of lithium-ion batter...

Claims

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Application Information

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IPC IPC(8): B01F3/12H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/5825H01M4/625H01M4/626H01M4/623H01M4/622H01M10/0525H01M2004/028B01F23/51B01F23/53B01F23/59Y02E60/10
Inventor 陈慧郭彬彬
Owner 余姚市海泰贸易有限公司
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