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A porous separation membrane for zinc-bromine flow battery and its preparation method

A technology of zinc-bromine flow battery and porous separation membrane, which is applied in the field of separation membrane, can solve the problems of increasing the mass transfer resistance of the separation membrane, fatigue or damage of the membrane matrix, and large mass transfer resistance, so as to reduce the difficulty of flow field planning, Reduce the effect of ohmic impedance and concentration polarization

Active Publication Date: 2021-08-24
NARI TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The separation membrane prepared by this method has the disadvantages of high tortuosity factor (4~10) and low porosity (≤30%); and the flat membrane is subjected to a large shear force during use, and the membrane matrix is ​​prone to fatigue or damage. phenomenon, in order to ensure the mechanical strength of the separation membrane during use, only to increase the thickness of the membrane, which further increases the mass transfer resistance of the separation membrane
Pore-making technologies such as extraction method and pore-forming agent method are often used in traditional membrane-making processes. The pore structure produced by this method is often a disordered sponge-like channel with a high tortuosity factor and large mass transfer resistance.

Method used

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  • A porous separation membrane for zinc-bromine flow battery and its preparation method
  • A porous separation membrane for zinc-bromine flow battery and its preparation method

Examples

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Effect test

Embodiment 1

[0029] A method for preparing a porous separation membrane, comprising the steps of:

[0030] (1) Mix 9.8wt% polyethylene and polyvinyl acetate copolymer polyethylene film base material, 0.1wt% single-layer graphene conductive agent, 90wt% N-methylpyrrolidone solvent, and 0.1wt% polyvinylpyrrolidone dispersant , the slurry was obtained after stirring and grinding at 20°C;

[0031] (2) Extrude the slurry through a spinneret with an outer diameter of inner tube 2 of 0.45 mm and an inner diameter of outer tube 1 of 0.5 mm, carry out phase inversion molding in water or ethanol, and solidify to obtain a porous separation membrane blank. The steps of conversion molding include: carry out at a temperature of 15°C and a relative humidity of 45%, through convective evaporation, after the solvent starts to volatilize, put it in a 19°C gel bath for 22 hours, and then put it in a 20°C ultra- In pure water, let it stand for 4 hours to remove a small amount of solvent and non-solvent addit...

Embodiment 2

[0037] A method for preparing a porous separation membrane, comprising the steps of:

[0038](1) Mix 60wt% polyvinyl acetate film matrix material, 18wt% multilayer graphene conductive agent, 20wt% dimethylformamide solvent, 2wt% aminotriacetic acid dispersant, stir and grind at 60°C to get slurry;

[0039] (2) Extrude the slurry through a spinneret with an outer diameter of inner tube 2 of 190 mm and an inner diameter of outer tube 1 of 200 mm, perform phase inversion molding in water or ethanol, solidify to obtain a porous separation membrane blank, and phase inversion molding The steps include: carry out at a temperature of 25°C and a relative humidity of 60%, through convective evaporation, after the solvent begins to volatilize, put it in a gel bath at 21°C for 28 hours, and then put it into ultrapure water at 30°C In, stand still for 8 hours, remove a small amount of solvent and non-solvent additive remaining in the film;

[0040] (3) Dry and cut the porous separation m...

Embodiment 3

[0043] A method for preparing a porous separation membrane, comprising the steps of:

[0044] (1) Mix 25wt% chlorosulfonated polyethylene film base material, 1 wt% acetylene black conductive agent, 73wt% dimethylacetamide solvent, 1 wt% ethylenediaminetetraacetic acid dispersant, stir and grind at 25°C get slurry;

[0045] (2) Extrude the slurry through a spinneret with an outer diameter of the inner tube 2 of 1.42 mm and an inner diameter of the outer tube 1 of 1.5 mm, perform phase inversion molding in water or ethanol, and solidify to obtain a porous separation membrane body, which is relatively The steps of conversion molding include: carry out at a temperature of 20°C and a relative humidity of 53%, through convective evaporation, after the solvent starts to volatilize, put it in a 20°C gel bath for 25 hours, and then put it in a 25°C ultra- In pure water, let it stand for 6 hours to remove a small amount of solvent and non-solvent additives remaining in the film;

[00...

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Abstract

The invention discloses a porous separation membrane and a preparation method thereof, and a battery manufactured by using the porous separation membrane. The raw material of the porous separation membrane includes the following substances in mass fractions: 9.8-60 wt% of the membrane base material, 0.1-18 wt% of the conductive agent , solvent 20-90wt%, dispersant 0.1-2wt%. The preparation method includes the following steps: (1) mixing the film base material, conductive agent, solvent, and dispersant, and stirring and grinding at 20-60°C to obtain a slurry; (2) extruding the slurry through a spinneret, Perform phase inversion molding with water or ethanol, and solidify to obtain a porous separation membrane blank; (3) drying and cutting the porous separation membrane blank to prepare a porous separation membrane. The battery is made using a porous separation membrane. The porous separation membrane of the invention has good mechanical properties and is simple to prepare; in addition, the mass transfer resistance used as a battery diaphragm is small, and the ohmic impedance and polarization impedance of the battery can be effectively reduced.

Description

technical field [0001] The invention relates to a separation membrane, in particular to a porous separation membrane, a preparation method thereof, and a battery manufactured by using the porous separation membrane. Background technique [0002] Zinc-bromine flow battery is a new type of electrochemical energy storage technology. This battery completes the mutual conversion of electrical energy and chemical energy through the mutual conversion of bromine ions and complexed bromine on the positive side of the electrolyte, and zinc ions and simple zinc on the negative side of the electrolyte. , to realize the storage and release of electric energy. During the charging process, the positive bromide ion loses electrons to generate complex bromine, and an oxidation reaction occurs, and the negative electrode zinc ion obtains electrons to form zinc element, and a reduction reaction occurs to realize the conversion of electrical energy to chemical energy. Compared with other energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/04B01D71/10B01D71/26B01D71/28B01D71/76H01M8/18
CPCB01D69/04B01D71/10B01D71/26B01D71/28B01D71/76H01M8/188Y02E60/50
Inventor 李欣何振宇杨冬梅曾雨竹陈永华吕宏水杨志宏朱金大
Owner NARI TECH CO LTD
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