Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Diaphragm for battery and preparation method and battery thereof

A separator and battery technology, applied in the field of battery separator and its preparation, can solve the problems of poor adhesion between the coating and the pole piece, unable to meet customer needs, etc., and achieve lower interface resistance, excellent rate discharge and cycle performance, tensile strength Excellent effect of tensile strength and heat shrinkage properties

Active Publication Date: 2018-12-11
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
View PDF20 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adhesion between the outermost PVDF coating and the pole piece is poor, and sometimes it cannot meet customer needs

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
  • Diaphragm for battery and preparation method and battery thereof
  • Diaphragm for battery and preparation method and battery thereof
  • Diaphragm for battery and preparation method and battery thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0108] According to another aspect of the present invention, the preparation method of the separator for batteries as described above comprises the following steps:

[0109] (a) preparing a composite coating separator;

[0110](b) Coating a PMMA coating on at least one surface outside the composite coating separator obtained in step (a), drying to obtain a separator for a battery.

[0111] The preparation method of the battery separator in the present invention has simple process, strong operability and low production cost. By adopting the mode of spraying, the PMMA coating is covered in dots without increasing the thickness and reducing the coating area coverage, thereby ensuring the separator It has excellent air permeability and meets the requirements of lithium ion migration.

[0112] Preferably, the drying temperature of the PMMA coating in the step (b) is 30-60°C, the drying time is 1-4min, and the coating method is spraying;

[0113] Typical but non-limiting examples ...

Embodiment 1

[0139] A separator for batteries, comprising a composite coating separator composed of a polyethylene base film and a boehmite coating, and a PMMA coating coated on one side of the composite coating separator.

[0140] The preparation method of the separator for the battery comprises the following steps:

[0141] (a) Add 95 parts of boehmite powder and 1.5 parts of vinyl bis stearamide to 75 parts of water, mix and stir for 50 minutes to disperse evenly, then add 25 parts of polyvinyl alcohol, 8 defoamers and 15 parts of polyvinyl acrylate Stir the ester evenly to obtain a boehmite slurry; apply the boehmite slurry on both sides of a polyethylene-based film with a thickness of 11.5um by micro-gravure roll coating to form a boehmite with a thickness of 2.2um on one side The coating is then dried in an oven at a drying temperature of 30°C and a drying time of 5 minutes;

[0142] (b) Add 20PMMA, 20 parts of thickener and 0.0015 parts of sodium lauryl sulfate to 95 parts of water...

Embodiment 2

[0144] A separator for a battery, comprising a composite coating separator composed of a polyethylene base film and a PVDF coating, and PMMA coatings coated on both sides of the composite coating separator.

[0145] The preparation method of the separator for the battery comprises the following steps:

[0146] (a) Add 110 parts of boehmite powder and 0.8 parts of polyethylene wax to 90 parts of water, mix and stir for 70 minutes to disperse evenly, then add 18 parts of polyethylene glycol, 15 parts of octanol and 7 parts of polybutylacrylate and stir well , to obtain the boehmite slurry; the boehmite slurry is coated on both sides of a polyethylene-based film with a thickness of 12.5um by using a micro-gravure roller coating method to form a boehmite coating with a thickness of 1.8um on one side. Then use an oven to dry, the drying temperature is 80 ° C, and the drying time is 1 min;

[0147] (b) Add 30 parts of PMMA, 10 parts of povidone and 0.0005 part of sodium dodecylbenz...

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
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of batteries, in particular to a separator for batteries, a preparation method thereof and batteries. The battery diaphragm comprises a composite coating diaphragm and a PMMA coating coated on at least one surface of the composite coating diaphragm. Preferably, the PMMA coating is provided on both surfaces on the outside of the composite coating diaphragm. The diaphragm used in the battery has low permeability increase value, meets the requirements of ion migration of the battery, improves the adhesion performance with the electrode plate, reduces the interface resistance, and thus improves the rate discharge and cycle performance of the battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a separator for batteries, a preparation method thereof and a battery. Background technique [0002] Coated separators are becoming more and more widely used in battery applications. The coating classification mainly includes: alumina coating, boehmite coating, PVDF (polyvinylidene difluoride, polyvinylidene fluoride) coating, and the composite of alumina, boehmite and PVDF coating etc. Among them, the function of the alumina / boehmite coating is mainly to improve the thermal stability of the diaphragm and the wettability of the diaphragm to the electrolyte; the function of the polyvinylidene fluoride coating is mainly to improve the adhesion between the diaphragm and the pole piece and The wettability of the separator to the electrolyte. The main function of adding a layer of PVDF coating after the alumina coating is to not only improve the thermal stability of the separator ...

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 Applications(China)
IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/403H01M50/411H01M50/431H01M50/449Y02E60/10
Inventor 徐锋苏碧海袁海朝贾亚峰
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com