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Polyvinylidene fluoride and vinylidene fluoride-hexafluoropropylene copolymer blended nanofibre polymer electrolyte membrane and preparation method thereof

A polyvinylidene fluoride, nanofiber membrane technology, applied in the direction of conjugated synthetic polymer rayon, fiber processing, circuits, etc., can solve the problems of unsafe batteries, low absorption rate, low conductivity, etc., and achieve bonding The effect of firmness, high liquid absorption and high porosity

Inactive Publication Date: 2010-08-18
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide polyvinylidene fluoride and vinylidene fluoride-hexafluoropropylene copolymer blend nanofiber polymer electrolyte membrane prepared by electrospinning method, to solve the electrolyte solution existing in the existing lithium ion battery electrolyte membrane Low absorption rate, low conductivity, poor strength, electrolyte membrane dissolves in the electrolyte at high temperature and makes the battery unsafe, and promotes the development of safe and high-performance lithium-ion battery technology

Method used

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  • Polyvinylidene fluoride and vinylidene fluoride-hexafluoropropylene copolymer blended nanofibre polymer electrolyte membrane and preparation method thereof
  • Polyvinylidene fluoride and vinylidene fluoride-hexafluoropropylene copolymer blended nanofibre polymer electrolyte membrane and preparation method thereof
  • Polyvinylidene fluoride and vinylidene fluoride-hexafluoropropylene copolymer blended nanofibre polymer electrolyte membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0054] 5.6g polyvinylidene fluoride and 2.4g vinylidene fluoride-hexafluoropropylene copolymer are dissolved in 64.4gN, in N-dimethylformamide and 27.6g acetone, the total concentration of solution is 8wt%, polyvinylidene fluoride and The mass ratio of vinylidene fluoride-hexafluoropropylene copolymer is 7:3, and the mass ratio of N,N-dimethylformamide to acetone in the solvent is 7:3. After magnetic stirring at 50°C for 48 hours, a clear and transparent The spinning solution was filtered and left to defoam. The polyvinylidene fluoride / vinylidene fluoride-hexafluoropropylene copolymer blended spinning solution is placed in the syringe of the electrospinning equipment, and the distance between the spinneret connected to the syringe and the drum receiver is adjusted to be 13 cm, and the temperature is When the temperature is 20±2°C and the humidity is 80%, the spinning solution is injected into the spinneret at a constant flow rate of 1ml / h under the action of the syringe pump, ...

Embodiment 2

[0057] 7.2g polyvinylidene fluoride and 0.8g vinylidene fluoride-hexafluoropropylene copolymer are dissolved in 64.4gN, in N-dimethylformamide and 27.6g acetone, the total concentration of solution is 8wt%, polyvinylidene fluoride and The mass ratio of vinylidene fluoride-hexafluoropropylene copolymer is 9:1, and the mass ratio of N,N-dimethylformamide to acetone in the solvent is 7:3. After magnetic stirring at 50°C for 48 hours, a clear and transparent The spinning solution was filtered and left to defoam. The polyvinylidene fluoride / vinylidene fluoride-hexafluoropropylene copolymer blended spinning solution is placed in the syringe of the electrospinning equipment, and the distance between the spinneret connected to the syringe and the drum receiver is adjusted to be 13 cm, and the temperature is When the temperature is 20±2°C and the humidity is 55%, the spinning solution is injected into the spinneret at a constant flow rate of 1ml / h under the action of the syringe pump, ...

Embodiment 3

[0061]4.0g polyvinylidene fluoride and 4.0g vinylidene fluoride-hexafluoropropylene copolymer are dissolved in 64.4gN, in N-dimethylformamide and 27.6g acetone, the total concentration of solution is 8wt%, polyvinylidene fluoride and The mass ratio of vinylidene fluoride-hexafluoropropylene copolymer is 1:1, and the mass ratio of N,N-dimethylformamide to acetone in the solvent is 7:3. After magnetic stirring at 50°C for 48 hours, a clear and transparent The spinning solution, after filtering, let it stand for defoaming. The polyvinylidene fluoride / vinylidene fluoride-hexafluoropropylene copolymer blended spinning solution is placed in the syringe of the electrospinning equipment, and the distance between the spinneret connected to the syringe and the drum receiver is adjusted to be 13 cm, and the temperature is When the temperature is 20±2°C and the humidity is 55%, the spinning solution is injected into the spinneret at a constant flow rate of 1ml / h under the action of the sy...

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Abstract

The invention relates to a polyvinylidene fluoride and vinylidene fluoride-hexafluoropropylene copolymer blended nanofibre polymer electrolyte membrane prepared by electrospinning and a preparation method thereof. The blended nanofibre polymer electrolyte membrane is a blended nanofibre membrane containing electrolyte and is made of a polyvinylidene fluoride and vinylidene fluoride-hexafluoropropylene copolymer blended nanofibre material; the polyvinylidene fluoride accounts for 50 to 90 percent of the mass of the blended nanfibre membrane, and the vinylidene fluoride-hexafluoropropylene copolymer accounts for 10 to 50 percent of the mass of the blended nanfibre membrane; and the porosity between polyvinylidene fluoride and vinylidene fluoride-hexafluoropropylene copolymer blended nanofibres in the blended nanfibre membrane is 45 to 80 percent. The liquid absorption rate of the membrane of the invention is 210 to 360 percent; and the room-temperature conductivity of the membrane of the invention can reach 3.04*10<-3>S / cm.

Description

technical field [0001] The invention belongs to the field of polymer electrolyte membrane prepared by electrospinning, in particular to polyvinylidene fluoride (PVDF) and vinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) blended nanofiber polymer prepared by electrospinning An electrolyte membrane, and an electrospinning preparation method of the nanofiber polymer electrolyte membrane. Background technique [0002] With the development of the economy and the progress of the society, human beings are also faced with the problem of reducing natural energy while creating wealth. Therefore, the country has put forward the policy of "energy saving and emission reduction". The development of green new energy materials and technologies has become a research hotspot for scientific researchers. Lithium-ion battery has the advantages of high specific energy, long cycle life, no memory effect, fast charge and discharge, etc. It is a green and pollution-free secondary batter...

Claims

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Application Information

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IPC IPC(8): C08J5/22C08L27/16C08L27/20D01F8/04D01D5/00H01M10/40
Inventor 操建华吴大勇王海燕唐代华
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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