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Composite anion-exchange membrane, its preparation and application

A composite anion and ion exchange technology, applied in the field of composite anion exchange membrane and its preparation, can solve the problems of decreased strength, difficult to control radiation dose, and high price of radiation equipment, and achieve the guarantee of electrical conductivity and swelling resistance, stable interface and mechanical properties. The effect of stability, simple and easy preparation process

Inactive Publication Date: 2013-01-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The radiation grafting method can make the ion-conducting components tightly bonded to the base film by covalent bonds. The interface between the two has good stability, but the radiation dose is difficult to control, and it is difficult to achieve a balance between the degree of grafting and the strength of the film. Or under gamma ray irradiation, the C-C bond on the main chain will be broken, resulting in a decrease in strength. In addition, the price of radiation equipment is high, and the time to initiate free radical polymerization is long, which is not conducive to large-scale and low-cost preparation of membranes.

Method used

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  • Composite anion-exchange membrane, its preparation and application
  • Composite anion-exchange membrane, its preparation and application
  • Composite anion-exchange membrane, its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Dissolve 0.25 g of chloromethyl polysulfone (chloromethyl degree: 0.74), 0.05 g of PVDF in 5 ml of NMP, add 180 μL of a mixture of methylimidazole and aminopropylimidazole (the volume ratio of the two is 5:1), 30 ° C Stir under low temperature for 2 hours, cast a film (area 6×6cm2) on flat glass, dry overnight at 60°C, and dry at 80°C for 48 hours; the obtained film thickness is 60 microns, and the current Efficiency > 99%, energy efficiency 80-81%, the battery runs 130 cycles, the efficiency is very stable (attached figure 2 a). The capacity stability of the battery is better than that of the uncompounded polysulfone imidazole membrane (attached figure 2 b).

Embodiment 2

[0057] Dissolve 0.35 g of chloromethyl polysulfone (chloromethyl degree: 0.74), 0.07 g of PVDF in 7 ml of NMP, add 210 μL of a mixture of methylimidazole and aminopropylimidazole (the volume ratio of the two is 13:1), 30 ° C Stir for 2 hours, cast film on flat glass (area 12 × 5cm 2 ), dried overnight at 60°C, and dried at 80°C for 48 hours; the obtained membrane-assembled all-vanadium redox flow energy storage battery (VRB), charged and discharged at 80mAcm-2, operated continuously for 460 cycles, with an average Coulombic efficiency of 98.1%, and an average energy efficiency of 74.5, basically stable (attached image 3 ).

Embodiment 3

[0059] Dissolve 0.705 g of chloromethyl polysulfone (chloromethyl degree: 0.86), 0.175 g of PVDF in 15 ml of NMP, add 420 μL of a mixture of methylimidazole and aminopropylimidazole (the volume ratio of the two is 24:1), 30 ° C Stir for 2 hours, cast film on flat glass (area 14 × 12cm 2 ), dried overnight at 60°C, and dried at 80°C for 48 hours; the resulting film thickness is 60 microns, its VRB current efficiency is over 98%, and its energy efficiency is 80-82%. The battery runs for 220 cycles and its performance is basically stable (see attached Figure 4 ).

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Abstract

The invention relates to a composite anion-exchange membrane, its preparation and application. The membrane comprises a halomethylation polymer, an ion exchange-based precursor, a double-effect cross-linking agent and a reinforcing material. In the preparation process, the reinforcing material molecular chain is linked with the conductive ionic polymer molecular chain by the double-effect cross-linking agent to form a mandatory interpenetrating polymer network to avoid macroscopic phase separation. The preparation method disclosed herein is easy to operate and has the advantages of low cost and no damage to the membrane strength in the implementation process, the obtained anionic membrane has stable interface and mechanical stability, and the conductivity and swelling resistance of the membrane can be simultaneously guaranteed.

Description

technical field [0001] The invention relates to the field of ion-exchange membrane materials for liquid flow energy storage batteries and fuel cells, in particular to a composite anion-exchange membrane and its preparation method and application. Background technique [0002] All-vanadium flow energy storage battery (VRB) has the advantages of high safety, good stability (charge and discharge cycles greater than 16,000 times), high efficiency (charge and discharge energy efficiency greater than 75%), long life (more than 15 years), and low cost. , becoming one of the first choices for large-scale high-efficiency energy storage devices. VRB can solve the discontinuous and unstable shortcomings of renewable energy such as wind energy, solar tidal energy, etc., and can increase the compatibility of smart grids with renewable energy generation to improve power utilization. [0003] As a key component of the flow energy storage battery, the ion exchange membrane plays the role o...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M8/02C08J5/22H01M8/1044H01M8/1069H01M8/1072
CPCY02E60/12Y02E60/50
Inventor 张华民张凤祥曲超刘波王晓丽
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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