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Preparation method of ceramic slurry, ceramic diaphragm and lithium ion battery

A kind of ceramic slurry and slurry technology, which is applied in the direction of secondary batteries, battery pack parts, circuits, etc., can solve the problems of easy rise, uneven thickness, soft agglomeration of ceramic powder, etc., and achieve extended service life and safety Improved performance and good heat resistance

Inactive Publication Date: 2021-07-09
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polyolefin separators are low in price, high in mechanical strength, and good in chemical stability. They have been widely used in lithium-ion batteries, but the heat resistance of polyolefin separators is not good. When lithium-ion batteries are discharged at high rates and cycled at high temperatures The interior is easy to rise, and when the rupture temperature of the polyolefin separator is reached, the separator will rupture, and the contact between the positive and negative electrodes will cause a short circuit
[0003] Previous studies have found that setting a ceramic layer on a polyolefin diaphragm can improve the heat resistance of the diaphragm, but the existing method of preparing a ceramic diaphragm is usually to uniformly mix ceramic particles, stabilizers, dispersants, and binders, and then mechanically stir , ball milling, ultrasonic dispersion and other steps to prepare ceramic slurry, however, the ceramic slurry obtained by this preparation method is prone to instability, and it is prone to delamination after a period of time, soft agglomeration of ceramic powder, and coating on the diaphragm Uneven thickness and other problems, so that the effect of improving the heat resistance of the prepared ceramic diaphragm is limited

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  • Preparation method of ceramic slurry, ceramic diaphragm and lithium ion battery
  • Preparation method of ceramic slurry, ceramic diaphragm and lithium ion battery

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preparation example Construction

[0036] The first aspect of the present invention provides a kind of preparation method of ceramic slurry, comprises the following steps:

[0037] 1) Add the stabilizer to deionized water, and use a dispersing plate to disperse and dissolve at a speed of 800 rpm until the stabilizer is completely dissolved to obtain the first solution;

[0038] 2) adding a dispersant to the first solution, and dispersing the dispersant in the first solution for 15-20 min at a speed of 800 rpm to obtain a second solution;

[0039] 3) adding ceramic powder to the second solution, and dispersing the ceramic powder for 15-20 min at a speed of 800-1000 rpm to obtain the first slurry;

[0040] 4) Use a sand mill to sand the first slurry at a speed of 2000 rpm, and the grinding balls are selected from zirconia balls with a particle size of 0.05-2 mm;

[0041] 5) adding a binder to the sand-milled first slurry, and dispersing the binder for 10 minutes at a speed of 500-800 rpm to obtain a second slurr...

Embodiment 1

[0073] 1, the preparation method of present embodiment ceramic slurry comprises the following steps:

[0074] 1) Add 0.48 g of sodium carboxymethyl cellulose to 56.43 g of deionized water, and use a dispersion plate to completely disperse and dissolve the sodium carboxymethyl cellulose at a speed of 800 rpm to obtain the first solution;

[0075] 2) Add 1.5 g of an ammonium salt of an acrylate copolymer with a solid content of 40% to the first solution, and disperse for 20 minutes at a speed of 800 rpm to obtain a second solution;

[0076] 3) Add 37g to the second solution 2 / g of α-phase alumina ceramic powder, and disperse the ceramic powder for 20 minutes at a rotation speed of 800 rpm to obtain the first slurry.

[0077] 4) Use a sand mill to grind the first slurry for 40 minutes at a speed of 2000 rpm. The grinding balls are zirconia balls with a particle size of 0.05 mm and a particle size of 2 mm, and zirconia with a particle size of 0.05 mm and particles The mass rati...

Embodiment 2

[0083] 1, the preparation method of present embodiment ceramic slurry comprises the following steps:

[0084] 1) Add 0.48 g of sodium carboxymethyl cellulose to 56.43 g of deionized water, and use a dispersion plate to completely disperse and dissolve the sodium carboxymethyl cellulose at a speed of 800 rpm to obtain the first solution;

[0085] 2) Add 1.5 g of an ammonium salt of an acrylate copolymer with a solid content of 40% to the first solution, and disperse for 20 minutes at a speed of 800 rpm to obtain a second solution;

[0086] 3) Add 37g to the second solution 2 / g of α-phase alumina ceramic powder, and disperse the ceramic powder for 20 minutes at a rotation speed of 800 rpm to obtain the first slurry.

[0087] 4) Use a sand mill to grind the first slurry for 40 minutes at a speed of 2000 rpm. The grinding balls are zirconia balls with a particle size of 0.05 mm and a particle size of 2 mm, and zirconia with a particle size of 0.05 mm and particles The mass rati...

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Abstract

The invention provides a preparation method of ceramic slurry, a ceramic diaphragm and a lithium ion battery, wherein the method comprises the steps: 1) adding a stabilizer into deionized water, and dispersing by using a dispersion disc at a rotating speed of 800 rpm until the stabilizer is dissolved to obtain a first solution; (2) adding a dispersing agent into the first solution, and dispersing for 15-20 minutes at a rotating speed of 800 rpm to obtain a second solution; (3) adding ceramic powder into the second solution, and dispersing for 15-20 minutes at a rotating speed of 800-1000 rpm to obtain first slurry; (4) sanding the first slurry by using a sand mill at a rotating speed of 2000 rpm; 5) adding a binder into the sanded first slurry, and dispersing for 10 min at a rotating speed of 500-800 rpm to obtain a second slurry; and 6) adding a wetting agent into the second slurry, and dispersing for 15-20 minutes to obtain the ceramic slurry. According to the preparation method, the ceramic slurry with good stability and uniform dispersion can be obtained.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a preparation method of ceramic slurry, a ceramic diaphragm and a lithium ion battery. Background technique [0002] Polyolefin separators are low in price, high in mechanical strength, and good in chemical stability. They have been widely used in lithium-ion batteries, but the heat resistance of polyolefin separators is not good. When lithium-ion batteries are discharged at high rates and cycled at high temperatures The inside is easy to rise, and when the rupture temperature of the polyolefin separator is reached, the separator will rupture, and the contact of the positive and negative electrodes will cause a short circuit. [0003] Previous studies have found that setting a ceramic layer on a polyolefin diaphragm can improve the heat resistance of the diaphragm, but the existing method of preparing a ceramic diaphragm is usually to uniformly mix ceramic particles, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/28C04B40/02H01M50/449H01M50/434H01M10/0525
CPCC04B26/285H01M10/0525C04B2111/00844C04B2111/00267C04B24/2652C04B14/303C04B24/32C04B40/0263Y02E60/10
Inventor 王金凤伍上福李雷刘璋勇
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD