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Proton-conducting membrane for flow batteries and preparation method thereof

An ion-conducting membrane and membrane-forming technology, which is applied in the field of flow batteries, can solve problems such as limiting the popularization and application of membranes, and difficulty in further improving ion selectivity.

Active Publication Date: 2016-12-07
BEIHANG UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0006] However, a further problem is that the study found that vanadium ions are only blocked by the positive charge carried by the anion exchange membrane t

Method used

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  • Proton-conducting membrane for flow batteries and preparation method thereof
  • Proton-conducting membrane for flow batteries and preparation method thereof

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preparation example Construction

[0025] The preparation method of a kind of polymer ion-conducting membrane according to the present invention comprises:

[0026] Step 1) Chloromethylation of polymers: polymers with excellent thermal stability and chemical stability, 1,4-dichloromethoxybutane, trifluoroacetic acid, zinc in a molar ratio of 1:5:1.1 : 1.5 Dissolve in the first type of organic solvent to form the solution to be reacted in an appropriate solvent and carry out stirring reaction at 30-50°C for 0.5-6h, pour the reaction mixture into the precipitant for precipitation after the reaction, and then filter sequentially , washing and drying to obtain a polymer containing chloromethyl;

[0027] Step 2) tertiary amination of the polymer: the polymer containing chloromethyl obtained in step 1, the phenol containing one or more tertiary amine groups or its derivatives and the alkali metal carbonate according to the amount of substance 1:1.2:1.1~2 is dissolved in the second type of organic solvent to form a s...

Embodiment 1

[0045] Step 1) Chloromethylation of polymers: 10 g of polysulfone, 1,4-dichloromethoxybutane, trifluoroacetic acid, and zinc were dissolved in dichloroethane at a molar ratio of 1:5:1.1:1.5 Form the solution to be reacted in a suitable solvent and carry out a stirring reaction at 30°C for 0.5h, pour the reaction mixture after the reaction into a precipitant for precipitation, and then filter, wash, and dry in sequence to obtain a polymer containing chloromethyl ;

[0046] Step 2) tertiary amination of the polymer: the chloromethyl-containing polymer, 2,4,6-tris(dimethylaminomethyl)phenol and cesium carbonate obtained in step 1 are in a mass ratio of 1:1.2 : 1.1 Dissolve in N,N-dimethylformamide to form a solution to be reacted, heat and reflux at 100°C for 12h, filter with suction, pour the mixture obtained after suction filtration into ethanol for precipitation, then filter, wash and dry in sequence , to obtain the tertiary amination product;

[0047] Step 3) Film formation...

Embodiment 2

[0057] Step 1. Chloromethylation of polymers: Dissolve 10g of polyethersulfone, 1,4-dichloromethoxybutane, trifluoroacetic acid, and zinc in dichloroethane at a molar ratio of 1:5:1.1:1.5 Form the solution to be reacted in a suitable solvent and carry out the stirring reaction at 35 ° C for 1 h, pour the reaction mixture after the reaction into ethanol for precipitation, and then filter, wash and dry in sequence to obtain a polymer containing chloromethyl;

[0058] Step 2, tertiary amination of polymer: the polymer containing chloromethyl, 2,6-bis(methylaminomethyl)-4-methyl-phenol and cesium carbonate obtained in step 1 are compared according to the amount of substance 1:1.2:1.5 was dissolved in N,N-dimethylformamide to form a solution to be reacted, heated and refluxed at 90°C for 12 hours, filtered with suction, and the mixture obtained after suction filtration was poured into ethanol for precipitation, and then filtered successively, Washing and drying to obtain a tertiary...

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Abstract

The invention discloses a proton-conducting membrane for flow batteries and a preparation method thereof. The method comprises the following steps: chloromethylating polymers (such as polysulfone, polyphenyl ether and other engineering plastics) with excellent heat stability and chemical stability, grafting a molecule containing functional tertiary amino group to obtain a tertiary-amino ion-conducting membrane, and carrying out flow casting or solution coating to obtain the membrane. The prepared membrane is compact, homogeneous and transparent, has excellent proton conductivity, ionic selectivity and chemical stability, and can satisfy the application requirements of all-vanadium redox flow batteries. The polymer ion-conducting membrane can also be used as a diaphragm material for proton exchange membrane fuel batteries, water electrolyzers, supercapacitors and other devices. The membrane has the advantages of simple preparation method, environment-friendly technique, low cost and excellent mechanical properties.

Description

technical field [0001] The invention relates to a membrane material for a flow battery, in particular to a polymer ion-conducting membrane, a preparation method thereof and a flow battery comprising the polymer ion-conducting membrane. Background technique [0002] With the rapid development of society, the demand for energy has increased sharply, and coal, oil, and natural gas are the main energy sources today. However, these fossil energy reserves are limited, and the development and utilization of renewable energy is an inevitable trend to achieve sustainable energy development. Solar and wind power generation is affected by climate, time and other factors, and the fluctuation is very large. The power quality cannot meet the electricity demand of the society. Therefore, it is necessary to develop an energy storage system that can be matched with solar and wind power. Provide stable and high-quality electric energy through the energy storage system. Therefore, energy sto...

Claims

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Application Information

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IPC IPC(8): C08G75/20C08G75/23C08G65/48C08J5/22H01M8/18
CPCC08G65/48C08G65/485C08G75/20C08G75/23C08J5/2256C08J2371/10C08J2371/12C08J2381/06H01M8/188Y02E60/50Y02P70/50
Inventor 相艳谭青龙卢善富
Owner BEIHANG UNIV
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