Preparation method of lithium ion battery negative electrode slurry
A lithium-ion battery, negative electrode slurry technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of reducing the dispersion effect and bonding effect of SBR, the destruction of surfactants, and the inability to process the slurry. Achieve the effect of avoiding the thickening of the slurry and making it impossible to process, reducing damage, and reducing the speed of the dispersion line
Inactive Publication Date: 2021-07-23
SHANDONG GOLDENCELL ELECTRONICS TECH
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[0003] However, since the graphite surface cannot be completely and uniformly coated with a uniform CMC film layer, the surface of SBR is a layer of surfactant. During the homogenization process, the exposed graphite surface that is not covered by CMC is easy to absorb surfactant. SBR surfactant After being taken away by the exposed graphite surface, the SBR surfactant is destroyed, resulting in cross-linking and agglomeration of SBR, reducing the dispersion effect and bonding effect of SBR, and causing thickening of the slurry in severe cases, making the slurry unprocessable
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[0026] The present invention adopts the following technical scheme: the preparation method of lithium-ion battery negative electrode slurry includes the following steps: firstly, the quantitative graphite is classified into large and small particles with an airflow classifier, and the graphite particles with a median particle size of ≤10 μm and particles with a median particle size of > 10 μm particles. At the same time, 1.0~1.5% sodium carboxymethylcellulose (CMC) water glue was prepared by conventional process.
[0027] Put a certain amount of conductive agent, graphite particles with a median particle size of ≤10 μm, and CMC water-colloid solution accounting for 20-40% of the total amount added into the mixer for stirring. The dispersion line speed is 14-15m / s, and the dispersion time is 1-2h. Then add the remaining 60-80% of the total amount of sodium carboxymethylcellulose (CMC) hydrocolloid and graphite particles with a median particle size > 10 μm for stirring, the disp...
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Abstract
The invention belongs to the technical field of lithium ion batteries, and relates to a preparation method of lithium ion battery negative electrode slurry. The preparation method comprises: carrying out size particle classification on a certain amount of graphite by using an airflow classifier, placing a certain amount of a conductive agent, graphite particles with a median particle size of less than or equal to 10 [mu]m, and a sodium carboxymethyl cellulose (CMC) aqueous glue solution accounting for 20-40% of the total amount into a stirrer, stirring, adding the rest of the sodium carboxymethyl cellulose (CMC) aqueous glue solution accounting for 60-80% of the total adding amount and graphite particles with a median particle size being greater than 10 10 [mu]m, and stirring; and adding a certain amount of sodium dodecyl sulfate aqueous solution with a mass concentration of 10-20% into the slurry, carrying out slow stirring, adding a certain amount of a styrene butadiene rubber (SBR) emulsion, and carrying out slow stirring to obtain the stable and good lithium battery negative electrode slurry. According to the invention, the dispersing effect and the bonding effect of SBR are improved, and finally the comprehensive performance of the lithium ion battery is improved.
Description
technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a method for preparing negative electrode slurry of lithium ion batteries. Background technique [0002] Lithium batteries have been widely used in the fields of energy storage and power due to their many advantages such as high energy density, long cycle life, small self-discharge, no memory effect, and environmental friendliness. In the current production of lithium batteries, the aqueous system negative electrode slurry binder sodium carboxymethylcellulose (CMC) and styrene-butadiene rubber emulsion (SBR) have better stability, comprehensive electrochemical performance and cost performance. [0003] However, since the graphite surface cannot be completely and uniformly coated with a uniform CMC film layer, the surface of SBR is a layer of surfactant. During the homogenization process, the exposed graphite surface that is not covered by CMC is easy to absorb surfact...
Claims
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Login to View More IPC IPC(8): H01M4/36H01M4/583H01M10/0525
CPCH01M4/366H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 王勇张敬捧
Owner SHANDONG GOLDENCELL ELECTRONICS TECH