A kind of ceramic coating diaphragm and preparation method and application

A technology of ceramic coating and diaphragm, applied in coatings, structural parts, electrical components, etc., can solve the problems of the decrease of high temperature resistance of ceramic coated diaphragm, the decrease of mechanical strength of ceramic coated diaphragm, and the easy falling off of ceramic particles. Improve the overall comprehensive performance, improve the peel strength, the effect of fast liquid absorption

Active Publication Date: 2021-08-17
SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
View PDF8 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as an inorganic material, ceramics have no stress conduction between ceramic particles, which seriously reduces the mechanical strength of the ceramic coating diaphragm; and the compatibility of the inorganic material of the ceramic particles with the base film of the organic diaphragm is poor, making the ceramic particles easy to fall off, that is, falling powder, As a result, the high temperature resistance of the ceramic coating separator is reduced, which affects the performance of the battery

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of ceramic coating diaphragm and preparation method and application
  • A kind of ceramic coating diaphragm and preparation method and application
  • A kind of ceramic coating diaphragm and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this example, a polypropylene microporous membrane with a thickness of 16 μm, a porosity of 40%, and a pore diameter of 0.02-0.03 μm was used as the base membrane by Shenzhen Zhongxing Innovative Materials Technology Co., Ltd.; aluminum oxide grafted with polyethylene glycol on the surface was used to prepare The ceramic coating diaphragm of this example; wherein, Al2O3 is purchased from Sumitomo, Japan, and the particle size is D500.50-0.82 μm. The specific preparation method is as follows:

[0035] 1. Preparation of Surface Grafted Polyethylene Glycol Al2O3

[0036] Disperse aluminum oxide particles in ethanol, add aminosilane coupling agent, react at 60°C, pH value about 6.5, react for 3 hours, wash and dry the reaction product to obtain aluminum oxide with amino groups on the surface; Aluminum oxide with amino groups on the surface and polyethylene glycol with carboxyl groups at the end are mixed, stirred and reacted at 50° C. for 1 hour, and then washed with wa...

Embodiment 2-7

[0041] Examples 2-7 respectively prepared silicon dioxide, zirconium dioxide, titanium dioxide, zinc oxide, magnesium oxide and calcium carbonate grafted with polyethylene glycol on the surface, which were used to prepare ceramic coating separators. details as follows:

Embodiment 2

[0042] Example 2 is similar to Example 1, except that silicon dioxide is used instead of aluminum oxide to form silicon dioxide grafted with polyethylene glycol on the surface, which is used to prepare a ceramic coating separator. All the other conditions are the same as in Example 1. Among them, the particle size of silicon dioxide is D50 0.50-0.61 μm.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
peel strengthaaaaaaaaaa
thicknessaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to view more

Abstract

The application discloses a ceramic coating diaphragm, a preparation method and an application. The ceramic coated separator of the present application includes a base film and a ceramic coating coated on at least one surface of the base film, wherein the ceramic coating is coated with inorganic particles grafted with polyethylene glycol on the surface. The ceramic coating diaphragm of the present application creatively uses inorganic particles grafted with polyethylene glycol on the surface to prepare a ceramic coating, which makes the interface bonding force between the inorganic particles and the base film better, and improves the overall peel strength of the ceramic coating diaphragm. While retaining the characteristics of ceramic coating such as high temperature resistance, it also solves the problem of inorganic particle shedding and powder falling. The inorganic particles grafted with polyethylene glycol on the surface have a better dispersion effect in water, so that the uniformity of the ceramic coating separator is better. The ceramic coating formed by the inorganic particles grafted with polyethylene glycol on the surface has a faster liquid absorption rate and a higher liquid absorption rate, and forms a gel after absorbing the electrolyte, so that the ceramic coating separator can be better attached to the electrode surface.

Description

technical field [0001] The present application relates to the field of lithium-ion battery separators, in particular to a ceramic coating separator and its preparation method and application. Background technique [0002] Lithium-ion battery separator is a porous membrane. The main function of the lithium-ion battery separator in the lithium-ion battery is to isolate the positive and negative electrodes of the battery to prevent the internal short circuit of the battery; to provide a channel for the migration of lithium ions during charging and discharging, and to allow lithium ions to pass through. The pre-commercialized diaphragms are mainly divided into dry-process unidirectional stretched diaphragms and wet-process biaxially stretched diaphragms. See patent US5480745, JP2004323820. [0003] In order to further improve the ability of the lithium battery separator to absorb electrolyte, improve the thermal stability of the separator and the ability to resist lithium dend...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/434H01M50/446H01M50/451C09D1/00H01M50/449
CPCC09D1/00H01M50/431H01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 姚坤王哲张辉乔井会
Owner SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap