A preparation method of graphene oxide modified polyurethane-cellulose lithium battery composite diaphragm

A composite diaphragm and cellulose technology, which is applied to battery components, circuits, electrical components, etc., can solve the problems of poor mechanical properties, high moisture permeability, and limited application of cellulose membranes, and achieve convenient operation, improved comprehensive performance, and The effect of readily available sources

Inactive Publication Date: 2020-12-22
BEIJING FORESTRY UNIVERSITY
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the structure of cellulose itself, the cellulose film has problems such as poor mechanical properties, high moisture permeability, and easy combustion in case of fire, which greatly limits its application in life, industry and other fields. Therefore, it is necessary to add a modifier Improved performance of cellulose separators

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 preparation method of graphene oxide modified polyurethane-cellulose lithium battery composite diaphragm
  • A preparation method of graphene oxide modified polyurethane-cellulose lithium battery composite diaphragm
  • A preparation method of graphene oxide modified polyurethane-cellulose lithium battery composite diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 2.5g of fully dry cellulose into 40g of 1-allyl-3-methylimidazolium chloride [Amim]Cl solution, stir in a 75°C water bath until completely dissolved. Under the protection of nitrogen, 0.6 g of 6-methylene diisocyanate was added to the cellulose casting solution and mixed evenly, and 0.03 g of dibutyltin dilaurate was added to react for 1.5 h. 0.02 g of graphene oxide was uniformly dispersed in 10 g of DMF solution by ultrasonic treatment for 25 min, and then the prepared graphene oxide suspension was added to the polyurethane-cellulose casting solution and mixed evenly. The mixed casting solution was left to defoam and then poured onto a clean glass plate, and scraped quickly with a scraper to form a film with a uniform thickness of 30 μm. The glass plate was immersed in distilled water to elute the solvent, and then the wet composite cellulose membrane was taken out, and the composite cellulose membrane was obtained after natural air drying.

Embodiment 2

[0030] Add 2.5g of fully dry cellulose into 40g of [Amim]Cl solution and stir in a water bath at 85°C until completely dissolved. Under the protection of nitrogen, 0.7 g of 6-methylene diisocyanate was added to the cellulose casting solution and mixed evenly, and 0.025 g of dibutyltin dilaurate was added to react for 1 h. 0.01 g of graphene oxide was uniformly dispersed in 10 g of DMF solution by ultrasonic treatment for 20 min, and then the prepared graphene oxide suspension was added to the polyurethane-cellulose casting solution and mixed evenly. The mixed casting solution was left to defoam and then poured onto a clean glass plate, and scraped quickly with a scraper to form a film with a uniform thickness of 28 μm. The glass plate was immersed in distilled water to elute the solvent, and then the wet composite cellulose membrane was taken out, and dried at 40° C. for 24 hours to obtain the composite cellulose membrane.

Embodiment 3

[0032] Add 2g of fully dry cellulose to 35g of [Amim]Cl solution, stir in a 75°C water bath until completely dissolved. Under the protection of nitrogen, 0.5 g of 6-methylene diisocyanate was added to the cellulose casting solution and mixed evenly, and 0.03 g of dibutyltin dilaurate was added to react for 1 h. 0.02 g of graphene oxide was uniformly dispersed in 15 g of DMF solution by ultrasonic treatment for 20 min, and then the prepared graphene oxide suspension was added to the polyurethane-cellulose casting solution and mixed evenly. The mixed casting solution was left to defoam and then poured onto a clean glass plate, and scraped quickly with a scraper to form a film with a uniform thickness of 40 μm. The wet composite cellulose membrane was taken out after the glass plate was immersed in distilled water to elute the solvent, and dried at 60° C. for 24 hours to obtain the composite cellulose membrane.

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
thermal resistanceaaaaaaaaaa
porosityaaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of a graphene oxide-modified polyurethane-cellulose lithium battery composite diaphragm, which belongs to the field of lithium battery materials. The composite cellulose diaphragm of the present invention is that cellulose is dissolved in ionic liquid [Amim]Cl, after cross-linking reaction with 6-methylene diisocyanate, and then mixed with graphene oxide to prepare wet graphene oxide modification The polyurethane-cellulose film material is then replaced by solvent and dried to form a separator, which can be used as a separator for non-aqueous lithium batteries. The diaphragm prepared by using the invention has good heat resistance, chemical solvent resistance and mechanical properties, and the use of renewable cellulose as a raw material has the advantages of low cost and biodegradability.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a method for preparing a graphene oxide-modified polyurethane-cellulose lithium battery composite diaphragm. Background technique [0002] Lithium-ion battery is a new type of green secondary battery successfully developed in the 1990s. In recent years, with the rise of new energy and electric vehicle emerging industries, the industry has placed high hopes on the development and performance improvement of power batteries. Lithium batteries are mainly composed of four parts: positive electrode material, negative electrode material, electrolyte and separator. As a high-value-added material with the highest technical barriers among battery materials, the separator plays the role of electronic insulation between the positive and negative electrodes and provides microporous channels for lithium ion migration. The performance of the diaphragm directly affects the cycle life, ...

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): H01M2/16H01M2/14H01M50/403H01M50/44H01M50/446H01M50/489
CPCH01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 蒲俊文王澌洁李丹吴忠旋张琴琴
Owner BEIJING FORESTRY UNIVERSITY
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