Reinforced nanofiber porous membrane and preparation method thereof

A nanofiber and reinforced technology, which is applied in the field of lithium-ion battery diaphragm and its preparation, can solve the problems of poor mechanical properties of nanofiber porous membrane, decreased battery self-shutdown performance, and failure to reach battery strength, etc., to improve mechanical properties, Improvement of ion permeability and improvement of tensile strength

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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  • 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 12wt%, at 50-60°C Heat and stir 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 0.3ml / h, and slowly increase the voltage to 15kv. The above 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, and the operation is performed at normal temperature...

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 mass ratio=8:2, and prepare a solution with a concentration of 16wt%. Heat and stir at 50°C for 20 minutes to fully dissolve. 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 above solution is sprayed out 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, and it is operated at normal temperature and ...

Embodiment 3

[0062] 1. Preparation of PMMA nanofiber porous membrane

[0063] Polymethyl methacrylate (PMMA) is dissolved in the mixed solvent of N, N-dimethylformamide (DMF) and toluene mass ratio=3: 2, is prepared into the solution that concentration is 20wt%, stirs 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, 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. Under the action of high pressure, the polymer solution is sprayed out from the needle of the syringe pump, and the film in the form of non-woven fabric is collected on the metal collecting device. The obtained non-woven film is placed in a vacuum drying oven, and it is operated at room temperature and reduced press...

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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 prepared by 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 invention relates to the field of 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 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, less environmental pollution, fast charging, and low self-discharge rate. As an important class of chemical batteries, the application fields of lithium-ion batteries have gradually moved from the fields 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 serious, transportation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/564D06M15/572D01F6/16D01F6/12D01F6/32D01F6/62D01F6/18D04H1/72H01M2/16D06M101/26D06M101/22D06M101/32D06M101/28
CPCY02E60/12Y02E60/10
Inventor 木士春瞿威
Owner WUHAN UNIV OF TECH
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