Method for preparing novel lithium battery diaphragm by coaxial electrostatic spinning

A technology of coaxial electrospinning and lithium battery diaphragm, which is applied in the direction of electrospinning, filament/wire forming, battery pack components, etc., can solve the problems of unfavorable, high ion conductivity and electrochemical performance, and achieve Improve tensile strength, improve high temperature thermal stability, and increase the effect of effective bonding points

Active Publication Date: 2017-02-22
DALIAN UNIV OF TECH
View PDF4 Cites 33 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, two polymer spinning liquid systems whose melting temperatures differ by more than 30°C are mixed and spun by electrospinning technology, and then hot-pressed at a temperature between the melting points of low-melting point polymers and high-melting point polymers. , so that the fiber membranes are bonded an

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
  • Method for preparing novel lithium battery diaphragm by coaxial electrostatic spinning
  • Method for preparing novel lithium battery diaphragm by coaxial electrostatic spinning
  • Method for preparing novel lithium battery diaphragm by coaxial electrostatic spinning

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] Take a certain amount of tetrahydrofuran and N-methylpyrrolidone mixed solvent with a volume ratio of 3:7, and dissolve a certain amount of PPESK powder in a round bottom flask to prepare a 10% mass fraction of PPESK polymer solution; take a certain volume ratio As a 4:6 mixed solvent of N,N dimethylacetamide (DMAc) and acetone, dissolve a certain amount of PVDF powder in a round bottom flask to prepare a PVDF solution with a mass fraction of 8%. Separate the two solutions Place it in a magnetic stirrer at a constant temperature of 60°C and magnetically stir for 12 hours to prepare a spinning solution, which is then stored in a brown glass bottle for later use. Use a disposable syringe with a capacity of 10ml to take 4ml of poly(aryl ether sulfone ketone) spinning solution and 10ml of polyvinylidene fluoride spinning solution. A flat stainless steel needle with a diameter of 0.3 mm is used as the core layer solution needle for coaxial spinning. The two ...

Example Embodiment

[0033] Example 2

[0034] Take a certain amount of tetrahydrofuran and N,N dimethylacetamide (DMAc) mixed solvent with a volume ratio of 4:6, dissolve a certain amount of PPESK powder in a round bottom flask to prepare a 15% mass fraction of PPESK polymer solution ; Remove a certain amount of N,N dimethylacetamide (DMAc) and acetone mixed solvent with a volume ratio of 3:7, dissolve a certain amount of PVDF powder in a round-bottom flask, and prepare a 12% mass fraction of PVDF solution , Put the two solutions in a magnetic stirrer at a constant temperature of 60°C and magnetically stir for 12 hours to prepare a spinning solution, and then store it in a brown glass bottle for later use. Use a disposable syringe with a capacity of 10ml to take 4ml of poly(aryl ether sulfone ketone) spinning solution and 10ml of polyvinylidene fluoride spinning solution. A flat stainless steel needle with a diameter of 0.3 mm is used as the core layer solution needle for coaxial spinning. The two ...

Example Embodiment

[0036] Example 3

[0037] Take a certain amount of tetrahydrofuran and N,N dimethylformamide (DMF) mixed solvent with a volume ratio of 6:4, and dissolve a certain amount of PPESK powder in a round bottom flask to prepare a 20% mass fraction of PPESK polymer solution ; Remove a certain amount of N,N dimethylacetamide (DMAc) and acetone mixed solvent with a volume ratio of 5:5, dissolve a certain amount of PVDF powder in a round bottom flask, and prepare a 16% mass fraction of PVDF solution , Put the two solutions in a magnetic stirrer at a constant temperature of 60°C and magnetically stir for 12 hours to prepare a spinning solution, and then store it in a brown glass bottle for later use. Use a disposable syringe with a capacity of 10ml to take 6ml of poly(aryl ether sulfone ketone) spinning solution and 8ml of polyvinylidene fluoride spinning solution. A flat stainless steel needle with a diameter of 0.3 mm is used as the core layer solution needle for coaxial spinning. The tw...

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
Tensile strengthaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention provides a method for preparing a novel lithium battery diaphragm by coaxial electrostatic spinning, and belongs to the technical field of the lithium battery diaphragm. The novel lithium battery diaphragm is a composite fiber membrane prepared by a coaxial electrostatic spinning technology and having a core/shell structure; the core and shell layers of the composite fiber membrane are concentric-coaxial-shaped; the core layer consists of high-melting-point polyarylether sulfone ketone nanofibers; the shell layer consists of low-melting-point polyvinylidene fluoride nanofibers; particularly, the coaxial composite diaphragm is subjected to hot-press treatment at certain temperature and pressure; and the shell layer fibers generate micro melting or melting to enhance the binding power between fibers, so that the tensile strength of the composite diaphragm in each direction is greatly improved. The porosity of the novel lithium battery diaphragm reaches greater than 75%; and the electrolyte absorption rate reaches greater than 550%; the diaphragm can withstand a temperature of 180 DEG C, so that the diaphragm prepared by the method has good electrochemical property, thermal performance and mechanical performance, which has high application value in the fields of aviation, spaceflight, electric vehicle and the like.

Description

technical field [0001] The invention relates to a novel lithium-ion battery diaphragm and a preparation method thereof. Specifically, the invention relates to a method for preparing a novel lithium-ion battery diaphragm by coaxial electrospinning, which belongs to the technical field of lithium-ion battery diaphragms. Background technique [0002] Due to the advantages of high energy density and high power density, lithium-ion batteries have been widely used in portable electronic products such as mobile phones and notebooks. With the shortage of oil resources and the increasingly serious environmental problems, they are gradually expanding to electric vehicles and hybrid vehicles. In the field of new energy vehicles, power lithium-ion batteries have great potential for development, and will also face more and more challenges. [0003] The lithium-ion battery separator plays the role of conducting lithium ions in the liquid electrolyte, and at the same time isolates the posi...

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
IPC IPC(8): H01M2/14H01M2/16D01D5/00D01D5/30H01M50/403H01M50/426H01M50/44
CPCD01D5/003D01D5/30H01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 阮诗伦龚文正宋贝贝李征谷俊峰
Owner DALIAN UNIV OF TECH
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