Waterborne ceramic coated membrane for lithium ion battery and preparation method thereof

A lithium-ion battery, water-based technology, applied to battery components, coatings, circuits, etc., can solve the problems of lithium-ion battery performance impact, high water content, etc., to improve the battery cycle life and use safety, infiltration Good performance and good thermal stability

Inactive Publication Date: 2016-07-20
CANGZHOU MINGZHU SEPARATOR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, cellulose compounds are used as thickeners in ceramic-coated diaphragms to prevent the sedimentation of ceramic particles. However, due to the strong hydrophilicity of cellulose compounds, ceramic-coated diaphragms containing cellulose compounds The water content is high, which has a great influence on the performance of the later assembled lithium-ion battery

Method used

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  • Waterborne ceramic coated membrane for lithium ion battery and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] The present invention uses a polypropylene microporous membrane with a thickness of 20 μm and a porosity of 45%. One side of the polypropylene microporous membrane is coated with a water-based ceramic coating with a thickness of 4 μm, wherein the water-based ceramic coating slurry contains The base material of 40wt% and the water of 60wt%; Said base material comprises boehmite powder 80g, D 50 0.4 μm, water-based wetting agent sodium dodecylbenzene sulfonate 10g, water-based adhesive polymethyl methacrylate 8g, water-based dispersant polyacrylic acid 2g, the total mass of the base material is 100g.

[0023] Its preparation method comprises the following steps:

[0024] (1). After stirring and mixing the boehmite powder and deionized water, use a high-speed disperser to disperse at a speed of 13000 rpm to obtain a boehmite dispersion solution;

[0025] (2). Mix the above-mentioned boehmite dispersion solution with water-based dispersant polyacrylic acid, water-based adh...

Embodiment 2

[0028] The present invention uses a polyethylene microporous membrane with a thickness of 16 μm and a porosity of 55%. One side of the polyethylene microporous membrane is coated with a water-based ceramic coating with a thickness of 2 μm, wherein the water-based ceramic coating slurry contains The base material of 30wt% and the water of 70wt%; Said base material comprises boehmite powder 98g, D 50 1 μm, water-based wetting agent sodium isopropyl naphthalene sulfonate 1g, water-based adhesive styrene-butadiene latex 1g, water-based dispersant sodium polyacrylate 1g, the total mass of the base material is 100g.

[0029] The preparation method is the same as in Example 1, wherein the speed of the disperser is 15000 rpm, the speed of the mixer is 600 rpm, the stirring time is 30 minutes, the coating method is spray coating, and the coating thickness is 2 μm.

Embodiment 3

[0031] The present invention uses a polypropylene / polyethylene / polypropylene microporous membrane with a thickness of 25 μm and a porosity of 49%. One side of the polyethylene microporous membrane is coated with a water-based ceramic coating with a thickness of 4 μm, wherein the water-based ceramic coating slurry The material contains 50wt% base material and 50wt% water by mass percent; the base material includes 75g of boehmite powder, D 50 0.7μm, water-based wetting agent butylnaphthalene sodium sulfonate 10g, water-based adhesive polymethyl methacrylate and polybutyl methacrylate mixture 10g, water-based dispersant polyacrylamide 5g, the total mass of the base material 100g.

[0032] The preparation method is the same as in Example 1, wherein the rotational speed of the disperser is 10000 rpm, the rotational speed of the mixer is 650 rpm, the stirring time is 25 minutes, the coating method is dip coating, and the coating thickness is 4 μm.

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Abstract

The invention discloses a waterborne ceramic coated membrane for a lithium ion battery and a preparation method thereof. The waterborne ceramic coated membrane comprises a microporous membrane and a ceramic coating, the ceramic coating is arranged on one side or two sides of the microporous membrane and prepared from, by weight, 40-70 wt% of water and 30-60 wt% of base materials, and the base materials include, by weight, 65-98 parts of boehmite powder, 1-15 parts of waterborne wetting agent, 1-15 parts of waterborne adhesive and 1-5 parts of waterborne dispersant. The waterborne ceramic coated membrane is good in conduction effect and high in thermostability and safety.

Description

technical field [0001] The invention relates to a coated diaphragm, in particular to a water-based ceramic coated diaphragm for lithium ion batteries, which belongs to the technical field of diaphragms. Background technique [0002] Due to serious environmental pollution and energy shortages, lithium-ion batteries have been highly valued due to their high energy density, no memory effect, and long cycle life. Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, diaphragms and electrolytes, and the diaphragm plays a role in preventing the short circuit caused by the contact of positive and negative electrode materials. At the same time, the microporous structure in the diaphragm can make lithium ions in the electrolyte Freely pass through between positive and negative electrodes, so as to realize the role of ion conduction. [0003] The thermal stability of the polyolefin microporous separator is poor, and it is easy to shr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14C09D1/00C09D7/12H01M50/403H01M50/434H01M50/443H01M50/457H01M50/489H01M50/491
CPCC09D7/65C09D7/63C09D1/00H01M50/403H01M50/446H01M50/491H01M50/443H01M50/457Y02E60/10
Inventor 韩宏哲于中彬赵中雷王庆通庄浩然邵培苓李昆良
Owner CANGZHOU MINGZHU SEPARATOR TECH CO LTD
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