A method for preparing lithium battery separators by coaxial electrospinning

A technology of coaxial electrospinning and lithium battery diaphragm, which is applied in the field of lithium ion battery diaphragm and its preparation, coaxial electrospinning to prepare lithium battery diaphragm, and can solve the problems of high ion conductivity and electrochemical performance, which are not conducive to , to achieve the effect of improving high temperature thermal stability, increasing tensile strength, and increasing effective bonding points

Active Publication Date: 2018-10-16
DALIAN UNIV OF TECH
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  • 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 and the mechanical strength of the fiber membrane is improved, but the higher heat treatment temperature will melt the low-melting point polymer, which will have a greater negative impact on the porosity of the separator, which will not be conducive to obtaining a higher High ionic conductivity and electrochemical performance

Method used

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  • A method for preparing lithium battery separators by coaxial electrospinning
  • A method for preparing lithium battery separators by coaxial electrospinning
  • A method for preparing lithium battery separators by coaxial electrospinning

Examples

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Embodiment 1

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

Embodiment 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, and prepare a PPESK polymer solution with a mass fraction of 15%. ; 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 PVDF solution with a mass fraction of 12% , the two solutions were respectively placed in a magnetic stirrer at a constant temperature of 60°C for 12 hours to obtain a spinning solution, which was then stored in a brown glass bottle for use. Use a disposable syringe with a capacity of 10ml to take 4ml of polyarylether sulfone ketone spinning solution and 10ml of polyvinylidene fluoride spinning solution respectively, choose a flat stainless steel needle with a diameter of 0.3mm as the core layer solution needle for coaxial spinning, and p...

Embodiment 3

[0037] Take a certain amount of tetrahydrofuran and N,N dimethylformamide (DMF) mixed solvent with a volume ratio of 6:4, dissolve a certain amount of PPESK powder in a round bottom flask, and prepare a PPESK polymer solution with a mass fraction of 20%. ; 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 PVDF solution with a mass fraction of 16% , the two solutions were respectively placed in a magnetic stirrer at a constant temperature of 60°C for 12 hours to obtain a spinning solution, which was then stored in a brown glass bottle for use. Use a disposable syringe with a capacity of 10ml to take 6ml of polyarylether sulfone ketone spinning solution and 8ml of polyvinylidene fluoride spinning solution respectively, choose a flat stainless steel needle with a diameter of 0.3mm as the core layer solution needle for coaxial spinning, and put...

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Abstract

The invention provides a method for preparing a lithium battery separator by coaxial electrospinning, belonging to the technical field of lithium battery separators. The lithium battery separator is a composite fiber membrane with a core / shell structure prepared by coaxial electrospinning technology. The core and shell layers of the composite fiber membrane are concentric, and the core layer is made of polyarylether sulfone ketone nanofibers with high melting point. Composition, the shell layer is composed of polyvinylidene fluoride nanofibers with low melting point, especially the coaxial composite film is hot-pressed at a certain temperature and pressure, and the shell layer fibers are micro-melted or melted to make the bonding between the fibers The tensile strength of the composite film in all directions is greatly improved. The lithium battery separator has a porosity of more than 75%, an electrolyte absorption rate of more than 550%, and can withstand high temperatures of 180°C. Therefore, the separator prepared by this method has good electrochemical properties and thermal and mechanical properties. And electric vehicles and other fields have high application value.

Description

technical field [0001] The invention relates to a lithium-ion battery diaphragm and a preparation method thereof. Specifically, the invention relates to a method for preparing a 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 positive and neg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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
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