Water-based ceramic coating lithium ion battery diaphragm and processing method thereof

A lithium-ion battery and ceramic coating technology, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problems of unfavorable large-scale continuous production and difficulty in controlling the uniformity of coating thickness, and achieve continuous and stable large-scale Large-scale production, easy consistency control, and excellent affinity

Inactive Publication Date: 2014-07-09
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the thickness of the water-based ceramic coating of the polyolefin diaphragm is getting thinner and thinner due to equipment wear and tear during the production process, and the uniformity of the coating thickness is difficult to control, which is not co

Method used

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  • Water-based ceramic coating lithium ion battery diaphragm and processing method thereof
  • Water-based ceramic coating lithium ion battery diaphragm and processing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A water-based ceramic coating lithium-ion battery separator, comprising a polypropylene porous membrane and a water-based ceramic coating coated on one side of the polypropylene porous membrane, wherein the polypropylene porous membrane has a thickness of 16um, a porosity of 42%, and a coating thickness of It is 4um, and the coating slurry used for the coating consists of 20% base material and 80% water calculated by weight percentage; the base material includes 0.1% water-soluble polymer thickener hydroxyethyl cellulose, Water-based dispersant polyethylene glycol 0.1%, water-based adhesive styrene-butadiene latex 0.1%, D 50 0.2um, BET is 15m 2 / g platy boehmite particles 99.7%.

[0031] The method for preparing the polymer inorganic lithium-ion battery diaphragm; comprising the following preparation steps:

[0032] 1. Add the amount of water-soluble polymer thickener hydroxyethyl cellulose, water-based dispersant polyethylene glycol and deionized water into the pre-m...

Embodiment 2

[0037] A water-based ceramic coating lithium-ion battery separator, comprising a polyethylene porous membrane and a water-based ceramic coating coated on both sides of the polyethylene porous membrane, wherein the polyethylene porous membrane has a thickness of 5um and a porosity of 35%. The thickness of the layers is 2um, and the coating slurry used in the coating consists of 30% base material and 70% water calculated by weight percentage; the base material includes water-soluble polymer thickener carboxymethyl cellulose calculated by weight percentage Sodium 5%, water-based dispersant polyacrylic acid 5%, water-based adhesive polymethyl methacrylate 10%, D 50 4um, BET is 2m 2 / g platy boehmite particles 80%.

[0038] The method for preparing the water-based ceramic coating lithium-ion battery diaphragm is the same as that of Example 1, except that the dispersion speed is 9000 rpm, and the coating method is dip coating.

Embodiment 3

[0040] A water-based ceramic coating lithium-ion battery separator, comprising polypropylene / polyethylene / polypropylene composite porous film and a water-based ceramic coating coated on one side of the polypropylene / polyethylene / polypropylene composite porous film, wherein polypropylene / polypropylene The thickness of the polyethylene / polypropylene composite porous film is 20um, the porosity is 39%, and the coating thickness is 5um, and the coating film slurry used for the coating consists of base material 40% and water 60% calculated by weight percentage; the base material Including 0.2% water-soluble polymer thickener polyacrylamide, 0.2% water-based dispersant sodium polyacrylate, 2% water-based adhesive polyethylacrylate, D 50 0.6um, BET is 12m 2 / g platy boehmite particles 97.6%.

[0041]The method for preparing the water-based ceramic coating lithium-ion battery diaphragm is the same as that of Example 1, except that the dispersion speed is 5000 rpm, and the coating meth...

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Abstract

The invention discloses a water-based ceramic coating lithium ion battery diaphragm. The water-based ceramic coating lithium ion battery diaphragm comprises a polyolefin porous membrane and a coating which coats one or both sides of the polyolefin porous membrane, wherein the coating is 2-8 microns in thickness, and consists of 20-60 percent by weight of base material and 40-80 percent of water; the base material comprises 0.1-5 parts by weight of a water-soluble high polymer thickener, 0.1-5 parts of a water-based dispenser, 0.1-10 parts of a water-based adhesive and 80-99.7 parts of boehmite particles. The invention further discloses a processing method of the ceramic coating lithium ion battery diaphragm. The processing method has the advantages of slight wear to mechanical equipment, uniform and consistent coating thickness and contribution to continuous and stable large-scale production.

Description

technical field [0001] The invention relates to a diaphragm, in particular to a water-based ceramic coating lithium-ion battery diaphragm which has little wear on mechanical equipment, uniform coating thickness, and is conducive to continuous, stable and large-scale production. 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 and interna...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/403H01M50/434H01M50/446
CPCH01M50/446H01M50/403Y02E60/10
Inventor 谭斌杨佳富
Owner SHENZHEN SENIOR TECH MATERIAL
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