Enhanced bi-component nanofiber porous membrane and preparation method thereof

A nanofiber, bicomponent fiber technology, applied in fiber processing, filament/wire forming, battery pack components, etc., can solve the problem of battery self-shutdown performance decline, poor mechanical properties of nanofiber porous membrane, and failure to reach battery Strength and other issues, to achieve the effect of improving ion permeability, improving mechanical strength, and improving performance

Inactive Publication Date: 2011-08-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the nanofiber lithium battery separator prepared by electrospinning has good ion permeability and good wetting performance, and has significantly improved temperature resistance and thermal dimensional stability compared with polyolefin separators, the battery’s The self-closing performance is reduced, and the mechanical properties of the nanofiber porous membrane are poor, and in many cases it cannot reach the strength of the assembled battery

Method used

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  • Enhanced bi-component nanofiber porous membrane and preparation method thereof
  • Enhanced bi-component nanofiber porous membrane and preparation method thereof
  • Enhanced bi-component nanofiber porous membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] 1. Preparation of PVDF and PUR two-component fiber membrane

[0033] Dissolve polyvinylidene fluoride (PVDF) and PUR in a mixed solvent of N,N-dimethylformamide (DMF) and acetone with a mass ratio of 5:5 at a mass ratio of 92:8, and prepare a concentration of 12 wt%. solution, heated and stirred at 50-60°C for 10-20 minutes to achieve full dissolution. Inject the obtained solution into a syringe pump with an 8# flat needle, the needle is connected to the high-voltage output end, and the other end 15 cm away from the syringe pump is a metal roller electrode grounded with a high-voltage power supply as a collection device. Adjust the injection speed of the syringe pump to 0.3ml / h, and slowly increase the voltage to 15kv. The solution is sprayed from the needle of the syringe pump under the action of high pressure, and the film in the form of non-woven fabric is collected on the metal collecting device, and the obtained non-woven film is placed in a vacuum drying oven, an...

Embodiment 2

[0041] 1. Preparation of PVDF-HFP and PUR bicomponent fiber membrane

[0042] Polyvinylidene fluoride-hexachloropropylene (PVDF-HFP) and PUR were dissolved in a mixed solvent of N, N-dimethylformamide (DMF) and acetone with a mass ratio of = 8: 2 at a mass ratio of 92:8, Prepare a solution with a concentration of 16 wt%, and heat and stir at 50-60° C. for 10-20 minutes to achieve full dissolution. Inject the solution into a syringe pump with an 8# flat needle, the needle is connected to the high-voltage output end, and the other end 15cm away from the syringe pump is a metal roller electrode that is grounded to the high-voltage power supply as a collection device. Adjust the injection speed of the syringe pump to 0.47ml / h, and slowly increase the voltage to 15kv. The solution is sprayed from the needle of the syringe pump under the action of high pressure, and the film in the form of non-woven fabric is collected on the metal collecting device, and the obtained non-woven film...

Embodiment 3

[0050] 1. Preparation of PMMA and PUR two-component fiber membrane

[0051] Polymethyl methacrylate (PMMA) and PUR are dissolved in the mixed solvent of N, N-dimethylformamide (DMF) and toluene mass ratio = 6: 4 according to the mass ratio = 92: 8, and the concentration is prepared as 20wt% solution was stirred at room temperature for 24 hours to achieve full dissolution. Inject the solution into a syringe pump with an 8# flat needle, the needle is connected to the high-voltage output end, and the other end 18cm away from the syringe pump is a metal roller electrode grounded with a high-voltage power supply as a collection device. Adjust the injection speed of the syringe pump to 0.2ml / h, and slowly increase the voltage to 15kv. The solution is sprayed from the needle of the syringe pump under the action of high pressure, and the film in the form of non-woven fabric is collected on the metal collecting device, and the obtained non-woven film is placed in a vacuum drying oven,...

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Abstract

The invention relates to an enhanced bi-component nanofiber porous membrane and a preparation method thereof. The porous membrane is a lithium ion battery membrane with two components of polymer resin and polyurethane. The membrane is in a semi-interpenetrating network structure which has a void ratio of 60-80%, and the mechanical property is 2-3 times higher than a single-component porous membrane of polymer resin. The preparation method comprises the steps of: dissolving a polymer resin and polyurethane prepolymer bi-component composition in a solvent, and preparing a nonwoven membrane through an electrospinning technology; and putting the nonwoven membrane at room temperature to make -NCO in the polyurethane prepolymer react with the -OH bond of water in the air to produce polyurethanethrough crosslinking and autopolymerization. In the invention, the nanofiber in the nonwoven membrane binds to form the polymer resin and polyurethane bi-component compound membrane, and the mechanical strength of the fibrous membrane is improved greatly. The method is easy, and the prepared nonwoven membrane maintains the advantages of high void ratio, and good thermal stability of polymer resinof the membrane prepared by using the electrospinning technology, and the membrane has good ion permeability and electrolyte affinity.

Description

technical field [0001] The invention relates to the field of lithium battery separators, in particular to a lithium ion battery separator with high porosity, good thermal stability and excellent mechanical strength and a preparation method thereof. The separator of the present invention can also be used as a separator material for fuel cells and the like. technical background [0002] Compared with other rechargeable batteries, lithium-ion batteries have the advantages of high voltage, high specific energy, long charge and discharge life, no memory effect, less environmental pollution, fast charging, and low self-discharge rate. As an important class of chemical batteries, the application field of lithium-ion batteries has gradually moved from the field of mobile phones, notebook computers, digital cameras, portable small appliances, submarines, aerospace, and aviation to the field of electric vehicle power. As global energy and environmental problems become more and more s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/00D01F8/16D04H1/72H01M2/16
CPCY02E60/12Y02E60/10
Inventor 木士春瞿威
Owner WUHAN UNIV OF TECH
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