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High-cohesiveness ceramic coating slurry and preparation method thereof

A high-adhesion, ceramic coating technology, used in polymer adhesive additives, adhesives, structural parts, etc., can solve problems such as large thermal shrinkage, weak pole piece adhesion, and weakened ceramic thermal shrinkage support capabilities. , to achieve good thermal support, improve thermal shrinkage resistance, and reduce PVDF content.

Pending Publication Date: 2021-11-05
DONGGUAN ADVANCED ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this coating method will have the following two problems: 1. Simple physical mixing of ceramics and glue. Due to the small particle size of the glue, most of the glue will be wrapped in the ceramics, and the glue will not achieve the original bonding. Therefore, the adhesion to the pole piece is weak; 2. Ceramics play an important role in the coating diaphragm, which is to play a support role against heat shrinkage, while the conventional mixed coating glue is wrapped in ceramics, which is equivalent to occupying The position of the ceramic, the thermal shrinkage support ability of the ceramic is greatly weakened, so the thermal shrinkage rate of the mixed-coated separator is relatively large

Method used

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  • High-cohesiveness ceramic coating slurry and preparation method thereof
  • High-cohesiveness ceramic coating slurry and preparation method thereof
  • High-cohesiveness ceramic coating slurry and preparation method thereof

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preparation example Construction

[0022] The invention discloses a preparation method of a highly cohesive ceramic coating slurry, which comprises the following steps:

[0023] Step 1, adding PVDF glue and kneading agent into deionized water and stirring, so that PVDF glue and kneading agent are combined to form large-grained PVDF micelles, and a primary slurry of large-grained PVDF micelles is obtained;

[0024] Step 2, adding ceramic powder, glue, dispersant and wetting agent into the primary slurry of large-particle PVDF micelles and stirring to obtain large-particle PVDF micellar slurry.

[0025] The large-particle PVDF micellar slurry includes the following raw materials in parts by weight: 20-40 parts of large-particle PVDF primary slurry, 50-70 parts of ceramic powder, and 5-15 parts of glue. The materials include the following raw materials in parts by weight: 5-7 parts of PVDF glue, 1-3 parts of kneading agent, and 1-3 parts of deionized water.

[0026] In step 1, the stirring speed is 1000-2000 rpm,...

Embodiment 1

[0030] Select 5 parts of polyvinylidene fluoride, 1 part of polyallyl nitrile and 1.5 parts of deionized water to mix, stir at 30°C and a stirring speed of 1200 rpm for 100 min, then add 55 parts of alumina, 6 parts of styrene-butadiene rubber After mixing 2 parts of maleic anhydride-vinyl acetate and 3 parts of fluoroalkyl methoxy ether alcohol, stir at 30°C and a stirring speed of 1200 rpm for 60 minutes to prepare a large-particle PVDF micellar slurry. The large-particle PVDF micellar slurry is coated on the diaphragm to obtain a high-bond ceramic coating diaphragm.

Embodiment 2

[0032] Select 6 parts of polyvinyl alcohol resin, 1.5 parts of polyvinyl sulfone and 2 parts of deionized water to mix, stir for 100 min at 30 ° C and a stirring speed of 1500 rpm, and then add 60 parts of silica, 10 parts of epoxy resin, After mixing 3 parts of polyethylene glycol and 5 parts of fluoroalkyl ethoxy ether alcohol, stir at 30°C and a stirring speed of 1500 rpm for 50 minutes to prepare a large-particle PVDF micellar slurry. The slurry is coated on the diaphragm to obtain a high-adhesion ceramic coating diaphragm.

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Abstract

The invention relates to high-cohesiveness ceramic coating slurry and a preparation method thereof. The method comprises the steps that: PVDF glue and a kneading agent are added into deionized water to be stirred, the PVDF glueand the kneading agent are combined to form large-particle PVDF micelle, and large-particle PVDF micelle primary slurry is obtained; and ceramic powder, glue, a dispersing agent and a wetting agent are added into the large-particle PVDF micelle primary slurry to be stirred, large-particle PVDF micelle slurry is obtained, and the large-particle PVDF micelle slurry is prepared from, by weight, 20-40 parts of large-particle PVDF primary slurry, 50-70 parts of ceramic powder and 5-15 parts of glue, and the large-particle PVDF micelle primary slurry comprises the following raw materials in parts by weight: 5-7 parts of PVDF glue, 1-3 parts of kneading agent and 1-3 parts of deionized water. According to the preparation method, the kneading agent and the PVDF glueare subjected to kneading pretreatment, so that the PVDF glue forms the large-particle PVDF micelle primary slurry, the large-particle PVDF micelle primary slurry can be highlighted on the surface of the ceramic after being mixed with the ceramic, a corresponding pole piece bonding effect is achieved, and meanwhile, the heat-resistant shrinkage performance of a film is improved.

Description

technical field [0001] The invention relates to the technical field of battery separators, in particular to a high-adhesion ceramic coating slurry and a preparation method thereof. Background technique [0002] At present, in order to save coating costs, there is a mixed-coating model for lithium-ion battery coated separators, which simply physically mixes glue (PVDF) and ceramics, and then coats the surface of the separator at one time to meet thermal shrinkage and adhesion. Relay requirements. However, this coating method will have the following two problems: 1. Simple physical mixing of ceramics and glue. Due to the small particle size of the glue, most of the glue will be wrapped in the ceramics, and the glue will not achieve the original bonding. Therefore, the adhesion to the pole piece is weak; 2. Ceramics play an important role in the coating diaphragm, which is to play a support role against heat shrinkage, while the conventional mixed coating glue is wrapped in ce...

Claims

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Application Information

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IPC IPC(8): H01M50/446H01M50/449H01M50/489H01M10/0525C09J1/00C09J11/08
CPCH01M50/446H01M50/449H01M50/489H01M10/0525C09J1/00C09J11/08Y02E60/10
Inventor 王志彬郭维东吴俊波李雪
Owner DONGGUAN ADVANCED ELECTRONICS TECH
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