Solvent processing method for polymer porous ion conducting membrane for flow battery

An ion-conducting membrane and processing method technology, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve problems such as reduced proton conductivity, and achieve the effects of improving performance, easy large-scale application, and good battery efficiency

Inactive Publication Date: 2017-12-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
View PDF3 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The smaller the pore size of the porous ion-conducting membrane, the better the ion selectivity, but the lower the proton conductivity. ...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Solvent processing method for polymer porous ion conducting membrane for flow battery
  • Solvent processing method for polymer porous ion conducting membrane for flow battery
  • Solvent processing method for polymer porous ion conducting membrane for flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]Dissolve 84g of polyethersulfone and 21g of polyvinylpyrrolidone in 195g of DMAc, stir mechanically for 24 hours to form a homogeneous polymer solution, let stand at 20°C for 2 hours to remove air bubbles in the solution, and evenly coat the casting solution on the crystal Dried glass plates were immersed in non-solvent water. Since the solubility of polyethersulfone in DMAc is much greater than that in water, water and DMAc will exchange with each other, and polyethersulfone will change from a gel state to a solid state. At the same time, the hydrophilic polyvinylpyrrolidone is dissolved in water to obtain a membrane with a porous structure. From figure 2 a It can be seen that the porous ion-conducting membrane prepared by the phase transition method has a typical asymmetric porous structure, and the cross-sectional morphology of the prepared membrane is as follows figure 2 As shown in a-b (the film thickness is about 115μm, the pore size is 2.21nm, from figure 2 ...

Embodiment 2

[0046] Dissolve 73.5g of polyethersulfone and 31.5g of polyvinylpyrrolidone in 195g of DMAc, stir mechanically for 24 hours to form a uniform polymer solution, let it stand at 30°C for 2 hours to remove air bubbles in the solution, and evenly coat the casting solution Cover on crystal-dried glass plates and immerse in non-solvent water. Since the solubility of polyethersulfone in DMAc is much greater than that in water, water and DMAc will exchange with each other, and polyethersulfone will change from a gel state to a solid state. At the same time, the hydrophilic polyvinylpyrrolidone is dissolved in water to obtain a membrane with a porous structure. Soak the prepared film in isopropanol for about 35 minutes, place it at room temperature to volatilize the isopropanol for 24 hours, and then soak it in water for more than 2 hours for use.

[0047] The solvent-treated membrane (thickness of about 115μm, pore size of 1.57nm, an asymmetric porous structure) was assembled into an...

Embodiment 3

[0049] Dissolve 78.75g of polyethersulfone and 26.25g of polyvinylpyrrolidone in 195g of DMAc, stir mechanically for 24 hours to form a homogeneous polymer solution, let stand at 25°C for 2 hours to remove air bubbles in the solution, and evenly coat the casting solution Cover on crystal-dried glass plates and immerse in non-solvent water. The solvent and non-solvent exchange each other to obtain a membrane with a porous structure. Soak the prepared film in isopropanol for about 35 minutes, place it at room temperature to let the isopropanol evaporate for 24 hours, and soak it in water for more than 2 hours after the solvent evaporates.

[0050] The solvent-treated membrane (thickness of about 115μm, pore size of 1.30nm, asymmetric porous structure) is assembled into an all-vanadium redox flow battery, in which the catalytic layer is activated carbon felt, the bipolar plate is a graphite plate, and the effective area of ​​the membrane is 48cm 2 , with a current density of 80m...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Film thicknessaaaaaaaaaa
Apertureaaaaaaaaaa
Login to view more

Abstract

The invention relates to a solvent processing method for a polymer porous ion conducting membrane for a flow battery; a polymer porous ion conducting membrane is placed in a processing solvent and soaked for 20 min or more, and then the film is placed at the temperature of 10-50 DEG C to make the solvent volatilized for 10 h or more; the polymer porous ion conducting membrane is prepared by one or two or more of organic polymer resins containing no ion exchange groups and used as raw materials. The porous ion conducting membrane after solvent processing has smaller pore size and also has high hole connectivity before processing, therefore, the porous ion conducting membrane has high ionic selectivity and proton conductivity as well as excellent oxidation stability. An all-vanadium flow battery assembled by the polymer porous ion conducting membrane has good cycle life and good battery efficiency.

Description

technical field [0001] The invention relates to a treatment method for a porous ion-conducting membrane used in a liquid flow battery. Background technique [0002] Liquid flow battery is a new electrochemical energy storage technology. Compared with other energy storage technologies, it has the advantages of flexible system design, large storage capacity, free site selection, high energy conversion efficiency, deep discharge, safety and environmental protection, power and capacity. With the advantages of independent design and low maintenance cost, it can be widely used in wind energy, solar energy and other renewable energy generation and energy storage, emergency power system, backup power station and power system peak shaving and valley filling. Vanadium flow battery (VFB) is considered to have a good application prospect due to its advantages of high safety, good stability, high efficiency, long life (lifetime > 15 years), and low cost. [0003] The battery separato...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M8/18H01M8/0239H01M8/0241
CPCH01M8/0239H01M8/0241H01M8/188Y02E60/50
Inventor 李先锋张华民鲁文静袁治章赵于月
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap