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Ion exchange membrane with separation of main chain and ion exchange group and its preparation and application

A technology of ion-exchange groups and ion-exchange membranes, which is applied in the field of ion-exchange membranes for flow batteries and their preparation and application, can solve problems such as stability degradation, and achieve controllability, adjustable ion-exchange capacity, and realization of The effect of battery efficiency

Active Publication Date: 2020-04-07
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 problem of stability decline caused by the existence of ion exchange groups in non-fluorine ion exchange membranes, to prepare an ion exchange membrane whose main chain is separated from ion exchange groups, and to maintain the selectivity of traditional ion exchange membranes. Improve its oxidation stability on the basis of conductivity and provide an ion-exchange membrane in which the main chain and ion-exchange groups are separated for a flow battery, especially the application of this type of membrane in an all-vanadium flow battery

Method used

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  • Ion exchange membrane with separation of main chain and ion exchange group and its preparation and application
  • Ion exchange membrane with separation of main chain and ion exchange group and its preparation and application
  • Ion exchange membrane with separation of main chain and ion exchange group and its preparation and application

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Embodiment 1

[0034] 4. Dissolve 5005g polyethersulfone and 3.1047g imidazole in 22.3361g DMAC, stir for 24 hours to form a uniform polymer solution, then add 2.2660g of phosphotungstic acid, stir for 5 hours and let stand at room temperature for 2 hours to remove the solution The bubbles in the glass plate were spread flat on the glass plate, and then the glass plate was transferred to a 50°C hot stage for heating for 48 hours. After cooling at room temperature, the glass plate was placed in a place containing 0.05mol L -1 In a water tank of hydrochloric acid, the obtained membrane was immersed in deionized water and left to stand for 24 hours; an ion-exchange membrane in which the main chain was separated from the ion-exchange groups was finally prepared. The imidazole and phosphotungstic acid in the membrane undergo an acid-base cross-linking reaction in an acidic solution environment to obtain an imidazole phosphotungstate that can conduct protons ( figure 1 ). Imidazolium phosphotungs...

Embodiment 2

[0039] 4.5048g of polyethersulfone and 3.0107g of 4,4-bipyridine were dissolved in 21.6888g of DMAC, stirred for 24 hours to form a uniform polymer solution, then added 3.7637g of phosphotungstic acid, stirred for 5 hours and left at room temperature 2 hours to remove the air bubbles in the solution, spread it on a glass plate, then transfer the glass plate to a 50°C hot stage and heat it for 48 hours, after cooling at room temperature, place the glass plate in a solution containing 0.1mol L -1 In the water tank of phosphoric acid, the obtained membrane was immersed in deionized water and left to stand for 48 hours; finally, an ion-exchange membrane in which the main chain was separated from the ion-exchange groups was prepared. The 4,4-bipyridine and phosphotungstic acid in the membrane undergo an acid-base cross-linking reaction in an aqueous solution environment to obtain a bipyridine phosphotungstate that can conduct protons.

[0040] An all-vanadium redox flow battery is ...

Embodiment 3

[0042] 4.5008g of polyethersulfone and 3.0212g of polyvinylpyrrolidone were dissolved in 21.3012g of DMAC, stirred for 24 hours to form a uniform polymer solution, then added 3.7930g of phosphotungstic acid, stirred for 5 hours and then left to stand at room temperature for 2 hours Remove the air bubbles in the solution, spread it on a glass plate, then transfer the glass plate to a hot stage at 50°C and heat it for 48 hours. After cooling at room temperature, place the glass plate in a solution containing 0.1mol L -1 In a water tank of sulfuric acid solution, the obtained membrane was immersed in deionized water and left to stand for 36 hours; an ion-exchange membrane in which the main chain was separated from the ion-exchange groups was finally prepared. The polyvinylpyrrolidone and phosphotungstic acid in the film are in 0.1molL -1 Acid-base cross-linking reaction occurs in sulfuric acid solution environment to obtain polyvinylpyrrolidone tungstate which can conduct protons...

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Abstract

The invention relates to an ion-exchange membrane in which the main chain is separated from the ion-exchange group: the ion-exchange membrane is formed by blending organic polymer resin, organic particles and inorganic particles in an organic solvent to form a solution, which is solidified by a phase inversion method After the membrane is formed, the membrane is placed in a non-solvent to prepare an ion-exchange membrane in which the main chain is separated from the ion-exchange groups. The ion-exchange membrane has a simple process, is environmentally friendly, has controllable ion-exchange groups and ion-exchange capacity, and is easy to realize mass production. Compared with the traditional ion-exchange membrane, the ion-exchange membrane whose main chain is separated from the ion-exchange group has excellent stability in a strongly acidic and oxidative battery environment due to the separation of the ion-exchange group from the main chain. The assembled battery has good cycle life and good battery efficiency.

Description

technical field [0001] The invention relates to an ion exchange membrane and its preparation and application, in particular to an ion exchange membrane for a liquid flow battery and its preparation and application. 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, and low maintenance costs. 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] T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0243
CPCY02E60/50
Inventor 李先锋张华民袁治章赵于月鲁文静戴卿
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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