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A porous ion-conducting membrane for a flow battery and its preparation and application

A technology for ion-conducting membranes and flow batteries, which is applied in the field of porous ion-conducting membranes for flow batteries and its preparation and application. It can solve the problems of low conductivity and poor selectivity of all-vanadium redox flow battery membranes, and achieve high ion conductivity. efficiency, excellent battery performance, and high ion selectivity

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

[0004] The purpose of the present invention is to solve the problems of poor selectivity and low conductivity of the all-vanadium redox flow battery membrane, and provide a simple method for preparing a high-performance porous ion-conducting membrane, which has a thin and dense separation layer and a loose porous support layer structure , the preparation method of this type of membrane is simple, the process is environmentally friendly, the thickness of the separation layer is controllable, the ion selectivity is excellent, and the ion conductivity is good

Method used

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  • A porous ion-conducting membrane for a flow battery and its preparation and application
  • A porous ion-conducting membrane for a flow battery and its preparation and application
  • A porous ion-conducting membrane for a flow battery and its preparation and application

Examples

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Effect test

Embodiment 1

[0024] 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. Prepare a homogeneous solution of 140g n-heptane and 35g 1,2-dibromoethane, spread the polymer solution on a glass plate, volatilize the solvent for 5s, then immerse the glass plate in n-heptane and 1,2 -Dibromoethane mixed solution for 10s, then transferred to a tank filled with deionized water at 25°C and completely submerged until solidified to form a film to obtain ions with a dense separation layer and a loose porous support layer (pore size distribution 100-200nm) Conductive membrane, the thickness of the separation layer is 1±0.5um, the porosity of the membrane is about 75%, and the thickness of the membrane is 18±2μm. Soak in 3mol L-1 sulfuric acid solution before use.

Embodiment 2

[0026] 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. Prepare a homogeneous solution of 81.67g n-hexane and 35g 1,2-dibromoethane, spread the polymer solution on a glass plate, evaporate the solvent for 5s, then immerse the glass plate in n-heptane and 1,2 - Dibromoethane mixed solution for 20s, then transferred to a tank filled with 25 ° C deionized water and completely submerged until solidified into a film, to obtain ions with a dense separation layer and a loose porous support layer (pore size distribution 100-200nm) Conductive membrane, the thickness of the separation layer is 3±0.5um, the porosity of the membrane is about 71%, and the thickness of the membrane is 18±2μm. Soak in 3mol L-1 sulfuric acid solution before use.

Embodiment 3

[0028] 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. Prepare a homogeneous solution of 65g n-heptane and 35g chloroform, spread the polymer solution on a glass plate, volatilize the solvent for 5s, and then immerse the glass plate in n-heptane and 1,2-dibromoethane Mixed solution for 20s, then transferred to a water tank filled with 25°C absolute ethanol and completely submerged until solidified to form a film to obtain an ion-conducting membrane with a dense separation layer and a loose porous support layer (pore size distribution 100-200nm), the separation layer The thickness is 3±0.5um, the membrane porosity is about 70%, and the membrane thickness is 18±2μm. Soak in 3mol L-1 sulfuric acid solution before use.

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Abstract

The invention relates to a preparation method of a porous ion conduction membrane for a flow battery. One or two or more organic polymer resins are used as raw materials, and the raw materials are dissolved in an organic solvent, then immersed in the poor solvent A of the resin, and transferred to the poor solvent bath B of the resin after a certain period of time. Using the two-step immersion-precipitation phase inversion method, by controlling the exchange rate of solvent-non-solvent, the thickness of the separation layer and the dense layer can be precisely regulated, so that ion conduction with a thin and dense separation layer and a loose porous support layer structure can be obtained. membrane. The advantages of the preparation method of the ion-conducting membrane provided by the present invention: the controllable adjustment of battery performance can be realized, the synchronous improvement of ion selectivity and ion conductivity can be realized, and excellent battery performance can be obtained; it is simple and easy to implement, and it is easy to realize mass production . The ion-conducting 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 an ion-conducting membrane in flow batteries. Background technique [0002] With the rapid development of renewable energy such as wind energy and solar energy and the smart grid industry, energy storage technology has received high attention, and large-scale energy storage technology is considered to be a key technology for large-scale utilization of renewable energy. Flow batteries, especially all-vanadium flow batteries, have the advantages of high safety, long cycle life, independent power and capacity, and are one of the preferred technologies for large-scale energy storage. The membrane is one of the key components of VFB, which plays a role in blocking the cross-blending of active materials in the positive and negative electrolytes, and at the same time transferring hydrogen ions to form a battery circuit. In general, an ideal membrane should have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08J9/00H01M8/1067H01M8/1069H01M8/18C08L79/04
CPCC08J5/18C08J9/00H01M8/1069H01M8/1067H01M8/188C08J2379/04Y02E60/50
Inventor 李先锋石梦奇张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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