Organic framework copolymer supported porous ion conducting membrane as well as preparation and application of porous ion conducting membrane

A technology of ion-conducting membranes and organic frameworks, which is applied in the application field of such membranes in flow batteries, can solve the problems of large pore size and low Coulombic efficiency of porous ion-conducting membranes, achieve high Coulombic efficiency and voltage efficiency, and avoid membrane Reduced ion conductivity, widening the effect of the preparation method

Active Publication Date: 2021-06-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method needs to make the aperture of the porous ion-conducting membrane before the solvent treatment is large enough (need to add enough hydrophilic regulating agent in the membrane casting liquid before casting the membrane, so that obtain enough large pore structure in the membrane forming process, The coulombic efficiency of the vanadium redox flow battery single cell assembled by the porous ion-conducting membrane before solvent treatment is low enough), which makes this method have certain limitations

Method used

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  • Organic framework copolymer supported porous ion conducting membrane as well as preparation and application of porous ion conducting membrane
  • Organic framework copolymer supported porous ion conducting membrane as well as preparation and application of porous ion conducting membrane
  • Organic framework copolymer supported porous ion conducting membrane as well as preparation and application of porous ion conducting membrane

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Embodiment 1

[0032]Using PES / (PVP+imidazole) as the base material, dissolve PES / (PVP+imidazole) in DMAC solvent to obtain a blend solution with a mass concentration of 30%, wherein the mass ratio of PES to PVP is 9:1, and the mass ratio of PVP to imidazole 1:1; pour the above blended solution on a clean and flat glass plate, volatilize the solvent for 10s under 20% humidity, and then immerse it as a whole in an aqueous solution containing 3wt% mass fraction of zinc chloride for 700s to form During the membrane process, imidazole in the casting solution and zinc chloride in the non-solvent generate ZIF in situ in the membrane, and a PES-(PVP+ZIF) porous ion-conducting membrane with a thickness of ~75 μm is prepared at 25°C (using M2 express). From image 3 a It can be seen that the cross-section of the prepared membrane has an obvious finger-like pore structure, which further enlarges the cross-sectional cortex structure ( image 3 c), it can be seen that ZIF (thickness ~ 80nm) with obvio...

Embodiment 2

[0034] Using PES / (PVP+imidazole) as the base material, dissolve PES / (PVP+imidazole) in DMAC solvent to obtain a blend solution with a mass concentration of 30%, wherein the mass ratio of PES to PVP is 9:1, and the mass ratio of PVP to imidazole 1:1; pour the above blended solution on a clean and flat glass plate, volatilize the solvent for 10s under 20% humidity, and then immerse it as a whole in a zinc chloride solution containing 3wt% mass fraction for 700s to form a film During the process, imidazole in the casting solution and zinc chloride in the non-solvent generate ZIF in situ in the membrane, and a PES-(PVP+ZIF) porous ion-conducting membrane with a thickness of ~75 μm is prepared at 25°C. After soaking the PES-(PVP+ZIF) porous ion-conducting membrane prepared above in ethanol for 30 minutes, dry it at room temperature for 60 minutes. During the drying process, the ZIF in the membrane pores can maintain its pore structure and remain unchanged, thereby Prevent the colla...

Embodiment 3

[0037] Using PES / imidazole as the base material, dissolve PES / imidazole in DMAC solvent to obtain a blend solution with a mass concentration of 26%, wherein the mass ratio of PES to imidazole is 8:2, pour the above blend solution on a clean and flat glass On the board, volatilize the solvent for 10s under 20% humidity, and then immerse it as a whole in a zinc chloride solution containing 3wt% mass fraction for 700s. Zinc generates ZIF in situ in the membrane, and a PES-ZIF porous ion-conducting membrane with a thickness of ~63 μm is prepared at 25 °C. The prepared porous ion-conducting membrane was soaked in ethanol for 30 minutes, and then dried at room temperature for 60 minutes. During the drying process, the ZIF in the membrane pores could maintain its pore structure, thus preventing the membrane pore structure from collapsing. Immerse it in 10wt% dilute hydrochloric acid solution to remove the ZIF generated in the membrane to obtain a ZIF-free PES porous ion-conducting me...

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Abstract

The invention discloses application of an organic framework copolymer supported porous ion conducting membrane in a flow battery. The membrane is prepared by dissolving a soluble organic framework copolymer precursor A in a membrane casting solution, applying the solution on a support body, and performing phase inversion in a non-solvent containing an organic framework copolymer precursor B. In the membrane forming process, the precursor A and the precursor B generate an organic framework copolymer in situ in the membrane. The prepared porous ion conducting membrane containing the organic framework copolymer is treated, dried and pickled to prepare the organic framework copolymer supported porous ion conducting membrane The designed and prepared porous ion conducting membrane has good battery performance in the flow battery, especially an all-vanadium flow battery.

Description

technical field [0001] The invention relates to the preparation of a porous ion-conducting membrane supported by an organic skeleton copolymer, in particular to the application of the membrane in a liquid flow battery. Background technique [0002] Flow battery energy storage technology has the advantages of environmental friendliness, high safety, independent design of power and capacity, and high cost-effective life cycle. The system cuts peaks and fills valleys, etc. As the key material of the flow battery, the ion-conducting membrane plays the role of blocking the cross-linking of positive and negative active materials and transferring charge-balanced ions to form the internal circuit of the battery. Its physical and chemical properties and cost directly determine the performance and cost of the battery system. Perfluorosulfonic acid ion exchange membrane is currently the most commonly used type of ion exchange membrane for flow batteries. The membrane material here has...

Claims

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Application Information

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IPC IPC(8): H01M8/0239H01M8/18
CPCH01M8/0239H01M8/188H01M2300/0082Y02E60/50
Inventor 袁治章李先锋胡静刘晓奇张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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