Lithium ion battery diaphragm with polymer inorganic coating and preparation method for lithium ion battery diaphragm

A lithium-ion battery, inorganic coating technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of large friction loss, unfavorable large-scale continuous production, and difficult to control the uniformity and uniformity of coating thickness. To achieve the effect of large bonding force, easy control of uniformity and consistency, and small loss

Active Publication Date: 2014-03-05
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings of traditional organic / inorganic composite films that have large friction loss to mechanical equipment, difficulty in controlling the uniformity of coating thickness, and being unfavorable for large-scale continuous production, the purpose of the present invention is to provide a method for reducing friction loss to mechanical equipment. Small, uniform coating thickness, conducive to large-scale continuous production of polymer inorganic coating lithium ion battery separator and preparation method thereof

Method used

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  • Lithium ion battery diaphragm with polymer inorganic coating and preparation method for lithium ion battery diaphragm
  • Lithium ion battery diaphragm with polymer inorganic coating and preparation method for lithium ion battery diaphragm

Examples

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preparation example Construction

[0025] A method for preparing a polymer inorganic lithium-ion battery diaphragm, comprising the following preparation steps:

[0026] 1. Add water-soluble polymer thickener, water-based dispersant and water into the mixing tank and stir evenly to obtain mixture I;

[0027] 2. Add polymer particles and ceramic particles to mixture I and stir, and disperse in a disperser. After stirring for 25-50 minutes, disperse in a high-speed disperser at a speed of 3000-9000rpm to obtain mixture II;

[0028] 3. Add water-based latex to the mixture II, stir evenly, and filter with a 300-mesh stainless steel screen to obtain a polymer inorganic slurry;

[0029] 4. Coat the polymer inorganic slurry on one or both sides of the polyolefin porous membrane, and obtain a polymer inorganic coating lithium-ion battery separator after drying; coating can be done by dip coating, roll coating, spray coating or Die coating method.

Embodiment 1

[0033] A polymer inorganic lithium-ion battery diaphragm, first, 0.1% of the water-soluble polymer thickener hydroxyethyl cellulose and 0.1% of the water-based dispersant ethylene glycol are added to 80% of the water, at room temperature, Stir at a speed of 400 rpm for 20 minutes until completely dissolved; then add 90% polymer particle polyimide, D50 is 4um, BET is 2m2 / g, 10% silicon dioxide particles, D50 is 0.2um, BET is 15m2 / g, added to the above solution, stirred at 800 rpm for 10 minutes, then dispersed in a disperser at 3000 rpm until completely dissolved; then, 0.% water-based latex styrene-acrylic latex was added to the above solution , stirred evenly; then filtered with a 300-mesh stainless steel screen to obtain a polymer inorganic slurry; finally coated on both sides of the polypropylene porous membrane by dip coating, and dried to obtain a polymer inorganic coated lithium-ion battery separator.

[0034] refer to figure 1 , figure 1 It is an electron microscope p...

Embodiment 2

[0036] A polymer inorganic lithium-ion battery diaphragm, first, 5% of the water-soluble polymer thickener sodium carboxymethyl cellulose and 5% of the water-based dispersant polyacrylic acid are added to 70% of the water, at room temperature, Stir at a speed of 400 rpm for 15 minutes until completely dissolved; then add 30% polyphenylene sulfide polymer particles, D50 is 4um, BET is 2m2 / g, 50% aluminum oxide particles, D50 is 0.2um, BET 15m2 / g, add to the above solution, stir at 800 rpm for 10 minutes, then disperse in a disperser at 9000 rpm until completely dissolved; then, add 10% water-based latex styrene-butadiene latex to the above solution , stirred evenly; then filtered with a 300-mesh stainless steel screen to obtain a polymer inorganic slurry; finally coated on both sides of the polypropylene porous membrane by dip coating, and dried to obtain a polymer inorganic coated lithium-ion battery separator.

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Abstract

The invention relates to the field of processing of lithium ion battery diaphragms, and discloses a lithium ion battery diaphragm with a polymer inorganic coating. The diaphragm comprises a macroporous polyolefin membrane and a coating layer on one side or two sides of the macroporous polyolefin membrane, wherein the coating layer consists of 20 to 60 weight percent of coating composition and 40 to 80 weight percent of water; the coating composition comprises 0.1 to 5 weight parts of water-soluble polymer thickener, 0.1 to 5 weight parts of water-based dispersing agent, 10 to 90 weight parts of polymer particles, 9.7 to 70 weight parts of ceramic particles and 0.1 to 10 weight parts of water-based latex. The invention also discloses a method for preparing the lithium ion battery diaphragm with the polymer inorganic coating. The lithium ion battery diaphragm has the advantages of low mechanical equipment friction loss, uniform and consistent coating thickness and favorability for large-scale continuous production.

Description

technical field [0001] The invention relates to the field of processing lithium-ion battery separators, in particular to a polymer inorganic-coated lithium-ion battery separator with uniform coating thickness and favorable large-scale continuous production and a preparation method thereof. Background technique [0002] Since the commercialization of lithium-ion batteries in the 1990s, they have been widely used as power sources for various mobile devices due to their high energy density, high operating voltage, no memory effect, and long cycle life. With the large-scale application of lithium-ion batteries, their safety issues have become increasingly prominent. [0003] In the lithium-ion battery, the main function of the separator is to separate the positive and negative electrodes of the battery and prevent short circuit caused by contact between the two electrodes. It is one of the key inner components. The performance of the separator determines the interface structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/18H01M50/403H01M50/417H01M50/446H01M50/457H01M50/489
CPCH01M50/411H01M50/44Y02E60/10
Inventor 谭斌王今刚杨佳富陈良
Owner SHENZHEN SENIOR TECH MATERIAL
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