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Polyvinylidene-fluoride-based composite fibrous membrane, preparation method and application thereof

A technology of polyvinylidene fluoride and composite fiber membrane, which is applied in the direction of textiles and papermaking, structural parts, electrical components, etc. It can solve the problems of difficult control of diaphragm pore size and porosity, elongation rate should not be too high, diaphragm perforation, etc., to achieve Improve high current charge and discharge performance, cheap raw materials and equipment, good lyophilic effect

Inactive Publication Date: 2013-06-12
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 fibrous membrane, preparation method and application thereof
  • Polyvinylidene-fluoride-based composite fibrous membrane, preparation method and application thereof
  • Polyvinylidene-fluoride-based composite fibrous membrane, preparation method and application thereof

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Embodiment 1

[0040] 1.5g PVDF was dissolved in a mixed solvent of 8mL DMF and 2mL acetone, and stirred for 20 hours under 60°C water bath conditions to obtain a 15% PVDF spinning solution. The spinning solution was poured into a container connected to the spinneret for electrospinning. The spinning conditions were as follows: the spinning voltage was 20kV, the inner diameter of the spinneret needle was 0.45mm, the distance between the needle and the collecting device was 15cm, an aluminum plate was used to collect the fibers, and the spinning process was carried out for 1 h to obtain a PVDF fiber membrane. SEM photos such as figure 2 As shown, the product has a fiber morphology with nodes on the fibers, and the fiber diameter is uneven, with an average diameter of 195 nm. The mean diameter in the context of the present invention refers to the overall average of the diameters of the fibers, which are measured at the locations of non-protrusions in the fibers.

Embodiment 2

[0042] Dissolve 0.8 g PVDF and 0.4 g PAN in 10 mL of DMF solvent, and stir in a water bath at 60° C. for 20 hours to obtain a mixed solution of 8% PVDF-4% PAN. The mixed solution was poured 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, an aluminum plate is used to collect the fibers, and the spinning process is carried out for 1h to obtain a PVDF-PAN composite fiber membrane . SEM photos such as image 3 As shown, the product has a fibrous morphology with nodes on the fibers and an average fiber diameter of 452 nm.

Embodiment 3

[0044] 1.6g PVDF and 0.4gPMMA were dissolved in 7.5mL DMF and 2.5mL acetone solvent, and stirred for 20 hours under 60°C water bath condition to obtain a 16%PVDF-4%PMMA mixed solution. The mixed solution was poured 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 collecting device is 15cm, an aluminum plate is used to collect the fibers, and the spinning process is carried out for 1h to obtain a PVDF-PMMA composite fiber membrane . SEM photos such as Figure 4 As shown, the product has a fibrous morphology with an average fiber diameter of 728 nm.

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Abstract

The invention provides a polyvinylidene-fluoride-based composite fibrous membrane, which comprises a polyvinylidene fluoride fibrous layer with the thickness ranging from 5 mu m to 120 mu m, wherein the diameters of the fibers range from 80 nm to 1500 nm; the polyvinylidene fluoride fibrous layer comprises the components in percentage by mass as follows: 15%-95% of polyvinylidene fluoride and 5%-85% of a modifier; and the modifier comprises a polymer and / or inorganic oxide. The preparation method is simple and feasible; the used raw materials and equipment are cheap; the prepared composite fibrous membrane has the advantages of high porosity and membrane flux, good mechanical strength and thermal stability, uniform thickness, controllability and the like; and when applied to a lithium ion battery, the composite fibrous membrane can improve the ionic conductivity and the charge-discharge performance of the high current of the battery, and shows good electrochemical performance and circulative 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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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
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