Method for preparing lithium ion battery electrode slurry by using vibration-mechanical stirring combination

A lithium-ion battery, mechanical stirring technology, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve the problems that affect the self-discharge performance of lithium-ion batteries, affect the coating quality, material agglomeration, etc., and achieve good dispersion and fineness. , Improve the beating efficiency and improve the effect of dispersion uniformity

Inactive Publication Date: 2018-08-14
安徽益佳通电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used homogenization method is to dissolve the binder in the solvent, and then add the conductive agent and the active substance in sequence for mechanical stirring. The process will easily lead to the agglomeration of materials, uneven dispersion, the efficiency of direct beating and the influence of coating. Quality, which further affects the self-discharge performance, cycle performance and safety performance of lithium-ion batteries

Method used

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  • Method for preparing lithium ion battery electrode slurry by using vibration-mechanical stirring combination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The method for preparing lithium-ion battery electrode slurry by means of vibration-mechanical stirring comprises the following steps:

[0025] S1: The active substance lithium manganate, the binder polyvinylidene fluoride, and the conductive agent SP are added together into a vibrating mixer for 1 hour of vibration stirring; the rate of vibration stirring is 30 rpm, the vibration frequency is 100 Hz, and in the process of vibration stirring The solvent N-methylpyrrolidone was continuously added in the form of spray, and the required solvent was added to the vibrating mixer within 1 h.

[0026] S2: After the addition of the solvent is completed, continue to vibrate and stir for 1 hour;

[0027] S3: Finally, the slurry is transferred to a stirring pot by a liquid pump and subjected to vacuum mechanical stirring for 2 hours to obtain the lithium-ion battery electrode slurry. The degree is -0.1MPa.

[0028] In the above steps, the weight ratio of lithium manganate, carbo...

Embodiment 2

[0030] The method for preparing lithium-ion battery electrode slurry by means of vibration-mechanical stirring comprises the following steps:

[0031] S1: Add the active material ternary cathode material (Ni:Co:Mn=4:2:4), the binder polyvinylidene fluoride, and the conductive agent SP into the vibrating mixer for 0.5h; the rate of vibrating stirring The vibration frequency is 50rpm, the vibration frequency is 150Hz, and the solvent N-methylpyrrolidone is continuously added in the form of spray during the vibration stirring process, and the required solvent is added to the vibration mixer within 0.5h.

[0032] S2: After the addition of the solvent is completed, continue to vibrate and stir for 1 hour;

[0033] S3: Finally, the slurry is transferred to a stirring pot by a liquid pump and subjected to vacuum mechanical stirring for 1.5 hours to obtain the lithium-ion battery electrode slurry. The degree is -0.1MPa.

[0034] In the above steps, the weight ratio of the ternary po...

Embodiment 3

[0036] The method for preparing lithium-ion battery electrode slurry by means of vibration-mechanical stirring comprises the following steps:

[0037] S1: Add the active material lithium iron phosphate, binder styrene-butadiene rubber, and conductive carbon nanotubes into a vibrating mixer for 1 hour of vibration stirring; the rate of vibration stirring is 40rpm, the vibration frequency is 180Hz, and Continuously add the solvent N-methylpyrrolidone in the form of spray, and add the required solvent to the vibrating mixer within 1h;

[0038] S2: After the addition of the solvent is completed, continue to vibrate and stir for 1 hour;

[0039] S3: Finally, the slurry is transferred to a stirring pot by a liquid pump and subjected to vacuum mechanical stirring for 2 hours to obtain the lithium-ion battery electrode slurry. The degree is -0.085MPa.

[0040] In the above steps, the weight ratio of lithium iron phosphate, carbon nanotubes, and styrene-butadiene rubber is 90:5:5; th...

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Abstract

The invention discloses a method for preparing lithium ion battery electrode slurry by using vibration-mechanical stirring combination, comprising the following steps of: S1: mixing active materials,binders and conductive agents for vibration stirring for 0.5 to 1h, and continuously adding the solvent by spraying during the vibration stirring process; S2: continuing the vibration stirring for 0.5to 1hour after the solvent is added; and S3: finally performing the vacuum mechanical stirring for 0.5 to 2 hours to obtain the lithium ion battery electrode slurry. The method has simple operation steps, improves production efficiency and reduces energy consumption. The obtained lithium ion battery electrode slurry has suitable viscosity, good dispersibility and fineness, and the prepared lithium ion battery has excellent performance.

Description

technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a method for preparing lithium ion battery electrode slurry by combining vibration and mechanical stirring. Background technique [0002] At present, lithium-ion batteries play a very important role in people's lives. At the same time, the materials and preparation processes of lithium-ion batteries have been extensively studied. The preparation of the slurry is directly related to the performance of lithium-ion batteries. The commonly used homogenization method is to dissolve the binder in the solvent, and then add the conductive agent and the active substance in sequence for mechanical stirring. The process will easily lead to the agglomeration of materials, uneven dispersion, the efficiency of direct beating and the influence of coating. The quality further affects the self-discharge performance, cycle performance and safety performance of lithium-ion batterie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/04
CPCH01M4/04H01M4/139Y02E60/10
Inventor 崔李三朱睿周双王龙超
Owner 安徽益佳通电池有限公司
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