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Polyvinylidene fluoride-based composite fiber membrane and its preparation method and application

A polyvinylidene fluoride, composite fiber membrane technology, applied in textiles and papermaking, structural parts, electrical components, etc., can solve the problems of difficult to control the pore size and porosity of the diaphragm, the elongation rate cannot be too high, and the environmental pollution. Improve high-current charge and discharge performance, cheap raw materials and equipment, and good mechanical strength

Inactive Publication Date: 2016-01-06
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, dry stretching is difficult to control the pore size and porosity of the diaphragm, and the stretching rate should not be too high, otherwise it will easily cause the diaphragm to perforate during stretching, so the thickness of the diaphragm is limited and cannot be made very thin, so it is mainly used for Production of low-end products; wet method is thermally induced phase separation method, wet method can better control the pore size and porosity of the diaphragm, but the output of this method is low, and the use of solvents may pollute the environment, and higher cost

Method used

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  • Polyvinylidene fluoride-based composite fiber membrane and its preparation method and application
  • Polyvinylidene fluoride-based composite fiber membrane and its preparation method and application
  • Polyvinylidene fluoride-based composite fiber membrane and its preparation method and application

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Embodiment 1

[0040] Dissolve 1.5g of PVDF in a mixed solvent of 8mL of DMF and 2mL of acetone, and stir for 20 hours in a water bath at 60°C to obtain a 15% PVDF spinning solution. Pour the spinning solution into a container connected to the spinneret for electrospinning. The spinning conditions are as follows: the spinning voltage is 20kV, the inner diameter of the spinneret needle is 0.45mm, the distance between the needle and the collecting device is 15cm, the aluminum plate is used to collect the fibers, the spinning process is carried out for 1h, and the PVDF fiber membrane is obtained. SEM photos as figure 2 As shown, the product has a fiber morphology, nodes exist on the fiber, the fiber diameter is uneven, and the average diameter is 195nm. The average diameter mentioned in the present invention refers to the overall average value of the fiber diameter, which measures the non-protruding position in the fiber.

Embodiment 2

[0042] 0.8gPVDF and 0.4gPAN were dissolved in 10mL DMF solvent, and stirred in a water bath at 60°C for 20 hours to obtain a mixed solution of 8%PVDF-4%PAN. Pour the mixed solution into a container connected to the spinneret for electrospinning. The spinning conditions are: the spinning voltage is 20kV, the inner diameter of the spinneret needle is 0.45mm, the distance between the needle and the collecting device is 15cm, the aluminum plate is used to collect the fibers, the spinning process is carried out for 1h, and the PVDF-PAN composite fiber membrane is obtained . SEM photos as image 3 As shown, the product has a fiber morphology, nodes exist on the fiber, and the average diameter of the fiber is 452nm.

Embodiment 3

[0044] 1.6g of PVDF and 0.4g of PMMA were dissolved in 7.5mL of DMF and 2.5mL of acetone solvent, and stirred for 20 hours in a water bath at 60°C to obtain a 16%PVDF-4%PMMA mixed solution. Pour the mixed solution into a container connected to the spinneret for electrospinning. The spinning conditions are: the spinning voltage is 15kV, the inner diameter of the spinneret needle is 0.45mm, the distance between the needle and the collection device is 15cm, the aluminum plate is used to collect the fibers, the spinning process is carried out for 1h, and the PVDF-PMMA composite fiber membrane is obtained . SEM photos as Figure 4 As shown, the product has a fiber morphology, and the average fiber diameter is 728nm.

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Abstract

The invention provides a polyvinylidene fluoride-based composite fiber membrane, which includes a polyvinylidene fluoride fiber layer with a thickness of 5-120 μm and a fiber diameter of 80-1500 nm. The polyvinylidene fluoride fiber layer includes the following mass percentages: Composition: 15~95% polyvinylidene fluoride, 5~85% modifier, the modifier includes polymer and / or inorganic oxide. The preparation method provided by the invention is simple and easy, the raw materials and equipment used are cheap, and the prepared composite fiber membrane has the advantages of high porosity, high membrane flux, good mechanical strength, good thermal stability, uniform and controllable thickness, etc. Applied to lithium-ion batteries can improve ion conductivity, improve its high-current charge and discharge performance, and show good electrochemical performance and cycle performance.

Description

technical field [0001] The invention relates to the technical field of power battery separators, in particular to a polyvinylidene fluoride-based composite fiber membrane and a preparation method and application thereof. Background technique [0002] Lithium (Li) ion batteries have many significant advantages such as high energy density, high working voltage, small self-discharge, long cycle life, and no memory effect. They belong to a new generation of green high-energy batteries. Lithium-ion batteries have been widely used in notebook computers, various portable electric tools, weapons and other fields, creating huge economic benefits. At present, many enterprises and scientific research institutes are actively developing efficient, safe and cheap new power lithium-ion batteries that can be applied to electric motorcycles and electric vehicles, which have very attractive industrialization prospects. [0003] The separator is a key component of the lithium-ion battery, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/4318D04H1/4382D04H1/728H01M2/16
CPCY02E60/10
Inventor 邱业君张占磊
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL