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Method for preparing ion conductivity membrane for flow battery through electrostatic spinning

A technology of ion conductivity and electrospinning, which is applied in the field of electrospinning to prepare ion-conducting diaphragms for flow batteries, to achieve the effects of improving mechanical strength and swelling resistance, reducing discharge capacity attenuation, and reducing thickness

Active Publication Date: 2018-09-28
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a game between ion conductivity, selectivity, and swelling resistance, which has become a key issue restricting the application of ion-conducting membranes to flow batteries.

Method used

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  • Method for preparing ion conductivity membrane for flow battery through electrostatic spinning
  • Method for preparing ion conductivity membrane for flow battery through electrostatic spinning
  • Method for preparing ion conductivity membrane for flow battery through electrostatic spinning

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Dissolve 0.6585g of sulfonated polyetheretherketone with an ion exchange capacity of 1.62mmol / g in 3g of N,N-dimethylformamide to prepare a spinning solution with a mass fraction of 18%, and then add 3.3mg The multi-walled carbon nanotubes are made to have a mass fraction of 0.5%, and after being magnetically stirred for 6 hours, ultrasonic waves are used for 30 minutes to make them uniformly dispersed. Under the spinning conditions that the applied voltage is 18kV and the distance from the spinneret to the receiving plate is 15cm, a three-dimensional network-like electrospun nanofiber is prepared, with a fiber diameter of 80-300nm and a thickness of 130μm.

[0025] Place the above-mentioned electrospun ordered nanofibers in the saturated steam above the N,N-dimethylformamide solvent bath at normal pressure and 60°C for 15 minutes to make the fibers swell and stick to each other. Then, hot press at room temperature and 4.0 MPa for 10 min to make the fibers form a dense fi...

Embodiment 2

[0028] Dissolve 0.6585g of sulfonated polyetheretherketone with an ion exchange capacity of 2.06mmol / g in 3g of N, N-dimethylformamide to prepare a spinning solution with a mass fraction of 18%, and then add 5.3mg The mass fraction of multi-walled carbon nanotubes is 0.8%. After being stirred by magnetic force for 6 hours, it is ultrasonically dispersed for 30 minutes to make it uniformly dispersed. Under the spinning conditions that the applied voltage is 20kV and the distance from the spinneret to the receiving plate is 18cm, three-dimensional network-like electrospun nanofibers are prepared, with a fiber diameter of 100-300nm and a thickness of about 130 μm.

[0029] The above nanofibers prepared by electrospinning were placed in the upper saturated steam of the N,N-dimethylformamide solvent bath at normal pressure and 60°C for 20 minutes to make the fibers swell and stick to each other. Then, the fibers were hot-pressed at room temperature and 5.0 MPa for 20 min to form a ...

Embodiment 3

[0032] Dissolve 0.6585g of sulfonated polyetheretherketone with an ion exchange capacity of 1.62mmol / g in 3g of N,N-dimethylformamide to prepare a spinning solution with a mass fraction of 18%, and then add 3.3mg The multi-walled carbon nanotubes are made to have a mass fraction of 0.2%, and after being magnetically stirred for 6 hours, ultrasonic waves are used for 30 minutes to make them uniformly dispersed. Under the spinning conditions that the applied voltage is 22kV and the distance between the spinneret and the receiving plate is 20cm, a three-dimensional network electrospun nanofiber is prepared, with a fiber diameter of 80-300nm and a thickness of about 200 μm.

[0033] The above nanofibers prepared by electrospinning were placed in the saturated steam above the N,N-dimethylformamide solvent bath at normal pressure and 60°C for 25 minutes to make the fibers swell and stick to each other. Then, the fibers were hot-pressed at room temperature and 3.0 MPa for 40 min to f...

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Abstract

The invention belongs to the technical field of electrochemical engineering and relates to a method for preparing an ion conductivity membrane for a flow battery through electrostatic spinning. In a high-voltage electric field, a carbon nanotube-doped non-fluorinated cation exchange polymer is dispersed into a spinning solution of an N,N-dimethyl formamide or N,N-dimethyl acetamide solvent; the spinning solution forms electrospun nanofiber on a receiving plate through the electrostatic force traction of a spinning nozzle to obtain the electrospun nanofiber with a three-dimensional network structure; and then solvent steam bath, hot pressing and protonation are carried out to prepare a compact membrane with ionic conductivity for the flow battery. Ions are conducted along the axial direction of the fiber to form a long-range ordered conducting channel; penetration of vanadium ions through a hydrophilic channel is significantly reduced through excellent ion barrier property of a carbon nanotube; and the electrospun membrane has relatively high mechanical strength and swelling resistance through fibration, therefore, the membrane disclosed by the invention obtains relatively high charge-discharge property of an all-vanadium flow battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemical engineering, and relates to a method for preparing an ion-conductive diaphragm of a liquid flow battery by electrospinning, which is prepared by electrospinning ion-conductive nanofibers, and undergoing solvent steam bath, hot pressing, and protonation , used as the diaphragm of the all-vanadium redox flow battery, can effectively reduce the surface resistance and vanadium ion permeability of the diaphragm, improve the mechanical strength, and obtain higher battery performance. Background technique [0002] Energy restricts social and economic development. The new renewable energy represented by wind energy and solar energy is green, efficient, and renewable, and is recognized as the fundamental way to replace fossil fuels and solve the energy crisis. However, there is a huge supply-demand "gap" between the irregularity and intermittent energy output of new renewable energy and the regula...

Claims

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Application Information

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IPC IPC(8): H01M8/0221H01M8/0226B82Y40/00D04H1/4326D04H1/728D06B3/10D06C21/00
CPCB82Y40/00D04H1/4326D04H1/728D06B3/10D06C21/00H01M8/0221H01M8/0226Y02E60/50
Inventor 吴雪梅贺高红李杰李祥村张代双彭桑珊焉晓明陈婉婷甄栋兴代岩
Owner DALIAN UNIV OF TECH
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