Low-permeability increment ceramic coating diaphragm and preparation method thereof

A ceramic coating, low air permeability technology, applied in coatings, electrical components, structural parts, etc., can solve the problems affecting the battery cycle performance and rate performance, increase the air permeability of the ceramic film, and increase the internal resistance of the battery, etc., and achieve excellent air permeability. performance, reducing the air permeability increment, and reducing the effect of the internal resistance of the diaphragm

Inactive Publication Date: 2022-05-27
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the ceramic coating on the base film, the air permeability of the ceramic film increases, which leads to an increase in the internal resistance of the battery, which seriously affects the cycle performance and rate performance of the battery.
Can no longer meet the needs of the current power market

Method used

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  • Low-permeability increment ceramic coating diaphragm and preparation method thereof
  • Low-permeability increment ceramic coating diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of a low-gas-permeable-increment ceramic-coated diaphragm, characterized in that it comprises the following steps:

[0026] (1) Mix the water-resistant binder and the hydrolyzable binder, and stir for 30 minutes to obtain the binder; the water-resistant binder and the hydrolyzable binder are compounded in a mass ratio of 1:0.5. The water-resistant adhesive is an acrylic resin adhesive (GR506), and the hydrolyzable adhesive is a polyvinyl alcohol adhesive.

[0027] Take the dispersant and put it in ultrapure water, add the ceramic powder after stirring for 5 minutes, add the binder after stirring for 30 minutes, add the wetting agent after stirring for 1 hour, and stir again for 30 minutes to obtain the ceramic slurry; in terms of mass percentage, the dispersion 0.9% of agent, 40% of ceramic powder, 3.5% of binder, 0.35% of wetting agent, and the rest are ultrapure water.

[0028] (2) Coating the prepared ceramic slurry on both sides of the base fil...

Embodiment 2

[0031] A preparation method of a low-gas-permeable-increment ceramic-coated diaphragm, characterized in that it comprises the following steps:

[0032] (1) Mix the water-resistant binder and the hydrolyzable binder, and stir for 20 minutes to obtain the binder; the water-resistant binder and the hydrolyzable binder are compounded in a mass ratio of 1:0.3. The water-resistant adhesive is an acrylic resin adhesive (GR506), and the hydrolyzable adhesive is a polyvinyl alcohol adhesive.

[0033] Take the dispersant and put it in ultrapure water, add ceramic powder after stirring for 10 minutes, add binder after stirring for 25 minutes, add wetting agent after stirring for 1.5 hours, and stir again for 25 minutes to obtain ceramic slurry; in terms of mass percentage, The dispersant is 3%, the ceramic powder is 45%, the binder is 6.5%, the wetting agent is 0.55%, and the rest is ultrapure water.

[0034] (2) Coating the prepared ceramic slurry on both sides of the base film to form...

Embodiment 3

[0037] A preparation method of a low-gas-permeable-increment ceramic-coated diaphragm, characterized in that it comprises the following steps:

[0038] (1) Mix the water-resistant binder and the hydrolyzable binder, and stir for 30 minutes to obtain the binder; the water-resistant binder and the hydrolyzable binder are compounded in a mass ratio of 1:1. The water-resistant adhesive is an acrylic resin adhesive (GR506), and the hydrolyzable adhesive is a polyvinyl alcohol adhesive.

[0039] Take the dispersant and put it in ultrapure water, add the ceramic powder after stirring for 10 minutes, add the binder after stirring for 30 minutes, add the wetting agent after stirring for 1.5 hours, and stir again for 30 minutes to obtain the ceramic slurry; in terms of mass percentage, Dispersant 0.6%-, ceramic powder 30%, binder 2.5%, wetting agent 0.15%, and the rest is ultrapure water.

[0040] (2) Coating the prepared ceramic slurry on both sides of the base film to form a ceramic ...

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Abstract

The invention discloses a low-permeability increment ceramic coated diaphragm and a preparation method thereof, and the coated diaphragm has the advantages of small permeability increment, high peel strength, high heat-resistant temperature, safety, environmental protection and the like, and is beneficial to lithium ion transmission and reduction of internal resistance of the diaphragm. According to the method, two different binders, namely a water-resistant binder and a solution binder (hydrolytic binder), are used, a water washing process is added after coating and drying are completed, the solution binder is cleaned away, so that hole blocking of the binders is reduced, the ventilation increment is reduced, and in addition, the process has the characteristics of safety, environmental protection and no pollution due to the fact that water is used as a solvent. The invention discloses a low-permeability increment ceramic coated diaphragm and a preparation method thereof, the process design is reasonable, the operation is simple, the prepared ceramic coated diaphragm not only has excellent permeability, small permeability increment and excellent heat resistance, the adhesive force between a ceramic coating and the diaphragm is ensured, and the low-permeability increment ceramic coated diaphragm has relatively high practicability.

Description

technical field [0001] The invention relates to the technical field of diaphragms, in particular to a low-breathing-increment ceramic-coated diaphragm and a preparation method thereof. Background technique [0002] The function of the separator is to isolate the positive and negative electrodes in the battery, prevent the contact between the positive and negative electrodes from causing an internal short circuit, and provide a channel for the free shuttle of ions inside the battery. The currently commercialized separators are mainly ceramic-coated separators because of their good electrochemical reaction inertness, thermal stability, electrolyte wettability, and mechanical strength. It is beneficial to improve the safety performance of the battery. However, due to the ceramic coating on the base film, the air permeability of the ceramic film increases, which leads to an increase in the internal resistance of the battery, which seriously affects the cycle performance and rat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/446H01M50/451H01M50/457H01M50/489H01M50/491H01M10/42C09D1/00C09D7/65C08F220/18C08F220/14C08F220/06C08F222/24
CPCH01M50/403H01M50/446H01M50/451H01M50/457H01M50/489H01M50/491H01M10/4235C09D1/00C09D7/65C08F220/1804C08F220/14C08F220/06C08F222/24Y02E60/10
Inventor 张学虎张立斌赵海玉陈朝晖
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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