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Dispersant-free ceramic coating slurry and preparation method thereof, lithium battery diaphragm and lithium battery

A lithium battery separator and ceramic coating technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as poor dispersion of ceramic slurry, and achieve the effects of improving coating processing performance, improving flatness, and reducing impact

Inactive Publication Date: 2020-12-04
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of poor dispersibility of ceramic slurry in the prior art, and to provide a method for preparing ceramic coating slurry by mechanical dispersion

Method used

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  • Dispersant-free ceramic coating slurry and preparation method thereof, lithium battery diaphragm and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 (earth grinding and dispersing, then whirling and impacting to disperse)

[0035] A kind of highly dispersed ceramic coating slurry, comprising the following steps:

[0036] Step 1, uniformly stir water and ceramic nanoparticles for 60 minutes, and then use a sander to grind and disperse for 60 minutes under the condition of 900 rpm;

[0037] Step 2, adding a thickener (sodium carboxymethylcellulose) and a binder (polyvinyl alcohol) and stirring for 60 minutes to make a water-based ceramic slurry;

[0038] Step 3, under the condition of 1500rpm, disperse by gyratory impact for 30 minutes and then shoot out.

[0039] Wherein: 33 parts of ceramic nanoparticles, 5 parts of sodium carboxymethylcellulose thickener, 2 parts of polyvinyl alcohol binder and 30 parts of water.

[0040] After testing, the median particle size of the ceramic nanoparticle suspension was 0.98 μm after sand grinding, and after adding thickener binder, the median particle size was 2.279...

Embodiment 2

[0043] Embodiment 2 (early frosting disperses, then whirling impact disperses)

[0044] A kind of highly dispersed ceramic coating slurry, comprising the following steps:

[0045] Step 1, uniformly stir water and ceramic nanoparticles for 90 minutes, and then use a sander to grind and disperse for 20 minutes under the condition of 800 rpm;

[0046] Step 2, adding a thickener (polyvinylamide) and a binder (polyvinyl butyral) and stirring for 60 minutes to make a water-based ceramic slurry;

[0047] Step 3, under the condition of 400rpm, use cyclotron impact to disperse for 90 minutes and then shoot out.

[0048] Wherein: 42 parts of ceramic nanoparticles, 10 parts of polyvinylamide thickener, 15 parts of polyvinyl butyral binder and 60 parts of water.

[0049] After testing, the median particle size of the ceramic nanoparticle suspension was 0.98 μm after sanding, and after adding thickener binder, the median particle size was 2.543 μm, and the median particle size decreased ...

Embodiment 3

[0052] Embodiment 3 (early frosting disperses, and then whirling impact disperses)

[0053] A kind of highly dispersed ceramic coating slurry, comprising the following steps:

[0054] Step 1, uniformly stir water and ceramic nanoparticles for 30 minutes, and then use a sander to grind and disperse for 60 minutes under the condition of 500 rpm;

[0055] Step 2, adding a thickener (polyacrylamide) and a binder (acrylic acid) and stirring for 60 minutes to make a water-based ceramic slurry;

[0056] Step 3, under the condition of 1500rpm, use cyclotron impact to disperse for 90 minutes and then shoot out.

[0057] Among them: 33 parts of ceramic nanoparticles, 15 parts of polyacrylamide thickener, 15 parts of acrylic binder and 66 parts of water.

[0058] After testing, the median particle size of the ceramic nanoparticle suspension was 0.98 μm after sand grinding, and after adding thickener binder, the median particle size was 2.198 μm, and the median particle size decreased to ...

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Abstract

The invention discloses a dispersant-free ceramic coating slurry and a preparation method thereof, a lithium battery diaphragm and a lithium battery. The ceramic coating slurry is prepared by the following steps: 1, uniformly stirring water and ceramic nanoparticles for 30-90 min, and then carrying out sand milling dispersion for 10-90 min by using a sand milling machine under the condition of 500-900 RPM; 2, adding a thickening agent and a binding agent, and stirring for 30-100 minutes to prepare water-based ceramic slurry; and 3, dispersing for 30-90 minutes by utilizing cyclotron impact under the condition of 400-2000 RPM, and then beating out.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a dispersant-free ceramic coating slurry, a lithium battery diaphragm and a lithium battery. Background technique [0002] At present, when the ceramic coating slurry for lithium batteries is prepared, after the main powder is put in, it is sanded and dispersed, and then additives such as binders are added; the binder itself has a high viscosity, and it is easy to film if it is not put in properly. It cannot be well dispersed, and at the same time, it will cause the powder to reunite; and if the finished slurry is sanded and dispersed again, it will destroy the molecular chain of the binder, resulting in the problem of cohesive failure caused by the breakage of the molecular chain. As a result, the adhesion force decreases and even the lithium battery separator powder falls off. Contents of the invention [0003] The object of the present invention is to solve the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14
Inventor 袁海朝徐锋邢鹏苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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