Reinforced nanofiber porous membrane and preparation method thereof

A reinforced, porous membrane technology, applied in the direction of fiber type, fiber treatment, electrical components, etc., can solve the problems of poor mechanical properties of nanofiber porous membranes, decreased battery self-shutdown performance, and failure to reach battery strength, etc., to improve mechanical performance. performance, improved ion permeability, and improved tensile strength

Inactive Publication Date: 2012-06-27
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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  • Reinforced nanofiber porous membrane and preparation method thereof
  • Reinforced nanofiber porous membrane and preparation method thereof
  • Reinforced nanofiber porous membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. Preparation of PVDF fiber membrane

[0039] Dissolve polyvinylidene fluoride (PVDF) in a mixed solvent of N, N-dimethylformamide (DMF) and acetone with a mass ratio of 5:5, and prepare a solution with a concentration of 12 wt% at 50-60°C Heat and stir for 10-20 minutes to achieve full dissolution. Inject the solution into a syringe pump with a 8# flat needle. The needle is connected to the high-voltage output end. At the other end 15cm away from the syringe pump is a metal roller electrode grounded to the high-voltage power supply as a collection device. Adjust the injection speed of the injection pump to 0.3ml / h, and slowly increase the voltage to 15kv. The above-mentioned solution is sprayed from the needle of the syringe pump under the action of high pressure, and collected in the form of a non-woven membrane on a metal collecting device. The obtained non-woven membrane is placed in a vacuum drying oven and operated at room temperature and reduced pressure for 12 ho...

Embodiment 2

[0050] 1. Preparation of PVDF-HFP fiber membrane

[0051] Dissolve polyvinylidene fluoride-hexachloropropylene (PVDF-HFP) in a mixed solvent of N,N-dimethylformamide (DMF) and acetone with a mass ratio of 8:2 to prepare a solution with a concentration of 16% by weight. Heat and stir at 50°C for 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. At the other end 15cm away from the syringe pump is a metal roller electrode 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 above-mentioned solution is sprayed out from the needle of the syringe pump under the action of high pressure, and collected on the metal collecting device in the form of a non-woven membrane. The obtained non-woven membrane is placed in a vacuum drying oven and operated at room temperatu...

Embodiment 3

[0062] 1. Preparation of PMMA nanofiber porous membrane

[0063] Dissolve polymethyl methacrylate (PMMA) in a mixed solvent with a mass ratio of N, N-dimethylformamide (DMF) and toluene = 3:2, prepare a solution with a concentration of 20 wt%, and stir at room temperature 24h 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. The other end 18cm from the syringe pump is a metal roller electrode grounded to the 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. Under the action of high pressure, the polymer solution is sprayed from the needle of the syringe pump, and the non-woven membrane is collected on the metal collecting device. The obtained non-woven membrane is placed in a vacuum drying oven and operated at room temperature and reduced pressure for 16 hours. After there is no res...

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Abstract

The invention relates to a reinforced nanofiber porous membrane and a preparation method thereof. The porous membrane is a two-component lithium ion battery diaphragm formed by compounding polymer resin with polyurethane, and has a semi-interpenetrating network structure, the porosity of 60 to 80 percent, and mechanical property which is 3 to 4 times higher than that of a polymer resin single-component porous membrane. The preparation method comprises the following steps of: preparing a polymer resin non-woven membrane by high-voltage electrostatic spinning, impregnating the non-woven membrane in solution of wet curing reaction polyurethane prepolymer with a high-reactivity isocyanate group, reacting -NCO in the polyurethane prepolymer with a -OH bond of water in air at room temperature to obtain the polyurethane through crosslinking and autopolymerization, so that nanofibers in the non-woven membrane are bonded to form a polymer resin and polyurethane two-component composite membrane, and the mechanical strength of the fiber membrane is greatly improved. The method is easy to operate, and the prepared non-woven membrane keeps the advantages of high porosity of a membrane preparedby an electrostatic spinning technology, and heat stability of the polymer resin, and has high ion permeability and affinity of electrolyte.

Description

Technical field [0001] The present invention relates to the field of battery diaphragms, in particular to a type of lithium ion battery diaphragms with high porosity, good thermal stability and excellent mechanical strength and a preparation method thereof. The present invention can also be used as a separator material for fuel cells and the like. Background technique [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, low environmental pollution, fast charging, and low self-discharge rate. As an important type of chemical battery, the application field of lithium-ion battery is gradually moving to the power field of electric vehicles from mobile phones, notebook computers, digital cameras, portable small appliances, submarines, aerospace, and aviation. As global energy and environmental issues are becoming more and more severe, vehicles have switch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M15/564D04H3/007D04H3/011H01M2/16D06M101/26D06M101/22D06M101/32D06M101/28
CPCY02E60/12Y02E60/10
Inventor 木士春瞿威
Owner WUHAN UNIV OF TECH
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