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A kind of cross-linked composite membrane for liquid flow battery and its preparation and application

A flow battery and composite membrane technology, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of low conductivity and poor selectivity of all-vanadium flow battery membranes, and achieve high ionic conductivity, thickness and density. The effect of controllable degree and easy mass production

Active Publication Date: 2022-04-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of poor selectivity and low conductivity of all-vanadium redox flow battery membranes, and provide a reaction-induced phase inversion method to prepare high-performance composite membranes. This type of membrane has a dense separation layer composed of chemically cross-linked polymer chains And the non-crosslinked support layer with loose porous structure, the preparation method of this type of membrane is simple, the process is environmentally friendly, the mechanical performance is high, the chemical stability is good, the ion selectivity is excellent, and the ion conductivity is good

Method used

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  • A kind of cross-linked composite membrane for liquid flow battery and its preparation and application
  • A kind of cross-linked composite membrane for liquid flow battery and its preparation and application
  • A kind of cross-linked composite membrane for liquid flow battery and its preparation and application

Examples

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Effect test

Embodiment 1

[0027] 6 g of polybenzimidazole (PBI) was dissolved in 44 g of DMAc and stirred at room temperature for 48 hours to form a polymer solution. Dissolve 0.5g of terephthaloyl chloride in 500ml of n-heptane to form a homogeneous solution, spread the polymer solution on a glass plate, volatilize the solvent for 5s, then immerse the glass plate in the homogeneous solution for 1min, and then transfer In the water tank filled with 25 ℃ deionized water and completely submerged until it solidifies and forms a film, a dense separation layer composed of chemically crosslinked polymer chains and a non-crosslinked support layer (pore size distribution 100-200nm) with a loose porous structure are obtained. Composite membrane, the separation layer thickness is 3±0.5um, the membrane porosity is about 75%, and the membrane thickness is 40±5μm. Soak in 3mol L-1 sulfuric acid solution before use.

Embodiment 2

[0029] 7.5g of polybenzimidazole (PBI) was dissolved in 42.5g of DMAc and stirred at room temperature for 48 hours to form a polymer solution. Dissolve 0.8g of isophthaloyl chloride in 500ml of n-heptane to form a homogeneous solution, spread the polymer solution on a glass plate, volatilize the solvent for 5s, then immerse the glass plate in the homogeneous solution for 2min, then transfer In the water tank filled with 25 ℃ deionized water and completely submerged until it solidifies and forms a film, a dense separation layer composed of chemically crosslinked polymer chains and a non-crosslinked support layer (pore size distribution 100-200nm) with a loose porous structure are obtained. Composite membrane, the separation layer thickness is 4±0.5um, the membrane porosity is about 70%, and the membrane thickness is 40±5μm. Soak in 3mol L-1 sulfuric acid solution before use.

Embodiment 3

[0031] 8.5g of polybenzimidazole (PBI) was dissolved in 41.5g of DMAc and stirred at room temperature for 48 hours to form a polymer solution. Dissolve 0.5g of 1,3,5-benzenetricarboxylic acid chloride in 500ml of n-heptane to form a homogeneous solution, spread the polymer solution on a glass plate, evaporate the solvent for 5 seconds, and then immerse the glass plate in the homogeneous solution 5min, then transferred to a water tank filled with 25°C deionized water and fully submerged until solidified to form a film, to obtain a dense separation layer composed of chemically crosslinked polymer chains and a non-crosslinked support layer with a loose porous structure (pore size distribution 100 -200nm) composite membrane, the separation layer thickness is 4±0.5um, the membrane porosity is about 71%, and the membrane thickness is 40±5μm. Soak in 3mol L-1 sulfuric acid solution before use.

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Abstract

The invention relates to a method for preparing a cross-linked composite membrane for a liquid flow battery. One or more organic polymer resins are used as raw materials, the raw materials are dissolved in an organic solvent, and then immersed in the resin containing a cross-linking agent. The poor solvent A is prepared by transferring the poor solvent B to the resin after a certain period of time. Using the reaction-induced phase inversion method, a dense separation layer composed of chemically cross-linked polymer chains and a loose non-cross-linked perforated macroporous support layer structure are obtained. Chemical cross-linked polymer chains ensure the stability of the membrane and a dense separation layer The high ion selectivity of the membrane is guaranteed, and the loose porous support layer ensures the high ion conductivity of the membrane. The preparation method of the cross-linked composite membrane provided by the invention has the advantages of high density of the separation layer, which significantly improves the coulombic efficiency of the membrane; controllable adjustment of battery performance; simple and easy implementation, and easy realization of mass production. The cross-linked composite membrane prepared by the invention has high mechanical strength and meets the requirements of battery assembly.

Description

technical field [0001] The invention relates to the research field of flow batteries, in particular to the application of a cross-linked composite membrane in flow batteries. Background technique [0002] Liquid flow battery is a large-scale electrochemical energy storage technology, which has the advantages of long cycle life, high safety, independent power and capacity, etc. large-scale application. Among them, vanadium redox flow battery (VFB) energy storage technology has become the preferred technology for large-scale and efficient energy storage due to its high safety, long life, large output power and energy storage capacity, good charge-discharge cycle performance, and environmental friendliness. one. [0003] Membrane is one of the key materials of VFB. It plays the role of blocking the cross-blending of vanadium ions in the positive and negative electrolytes, and at the same time transferring hydrogen ions to form a battery circuit. Its performance directly affec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/22C08L79/04H01M8/18
CPCC08J5/2256H01M8/188C08J2379/04Y02E60/50
Inventor 李先锋石梦奇张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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