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Porous membrane for flow battery and with hierarchical pore structure, and preparation and application thereof

A technology of liquid flow battery and all-vanadium redox flow battery, which is applied in the field of porous membranes, can solve the problems of difficult balance between selectivity and proton conductivity, achieve the controllability of battery efficiency and capacity, facilitate mass production, and improve selective effect

Active Publication Date: 2017-03-22
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

However, it is difficult to balance the selectivity and proton conductivity of porous membranes for hydrogen ions and vanadium ions, so it is of great significance to improve the selectivity and ion conductivity of porous membranes, and then realize their large-scale application.

Method used

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  • Porous membrane for flow battery and with hierarchical pore structure, and preparation and application thereof
  • Porous membrane for flow battery and with hierarchical pore structure, and preparation and application thereof
  • Porous membrane for flow battery and with hierarchical pore structure, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Dissolve 9.975g of polyethersulfone, 0.525g of sulfonated polyetheretherketone and 1.0506g of phenolphthalein in 19.5g of DMAC, stir for 48 hours, spread the polymer solution on a glass plate, and then quickly immerse it in 4L of water to solidify , forming a porous separator with a film thickness of 175 μm. Soak the prepared porous membrane in ethanol for 48 hours to remove the phenolphthalein template agent in the membrane, and prepare a porous membrane with hierarchical pore structure. Then wash with water and continue soaking in ethanol to completely remove the template agent in the film. The pore size of the porous membrane is 0.1 μm-0.2 μm, and the small pore size is 0.1-100 nm. The all-vanadium redox flow battery is assembled by using the prepared porous membrane with hierarchical pore structure, in which the catalytic layer is activated carbon felt, the bipolar plate is graphite plate, and the effective area of ​​the membrane is 9cm 2 , the current density is ...

Embodiment 2

[0038] Dissolve 9.975g of polyethersulfone, 0.525g of sulfonated polyetheretherketone and 2.1g of phenolphthalein in 19.5g of DMAC, stir for 48 hours, spread the polymer solution on a glass plate, then quickly immerse in 4L of water, and solidify , forming a porous separator with a film thickness of 175 μm. Soak the prepared porous membrane in ethanol for 48 hours to remove the phenolphthalein template agent in the membrane, and prepare a porous membrane with hierarchical pore structure. Then wash with water and continue soaking in ethanol to completely remove the template agent in the film. The all-vanadium redox flow battery is assembled by using the prepared porous membrane with hierarchical pore structure, in which the catalytic layer is activated carbon felt, the bipolar plate is graphite plate, and the effective area of ​​the membrane is 9cm 2 , the current density is 80mA.cm -2 , the vanadium ion concentration in the electrolyte is 1.50mol L -1 , H 2 SO 4 The conce...

Embodiment 3

[0041] Dissolve 9.975g of polyethersulfone, 0.525g of sulfonated polyetheretherketone and 3.15g of phenolphthalein in 19.5g of DMAC, stir for 48 hours, and spread the formed polymer solution on a glass plate, then quickly immerse in 4L of water, and solidify , forming a porous separator with a film thickness of 175 μm. Soak the prepared porous membrane in ethanol for 48 hours to remove the phenolphthalein template agent in the membrane, and prepare a porous membrane with hierarchical pore structure. Then wash with water and continue soaking in ethanol to completely remove the template agent in the film. The all-vanadium redox flow battery is assembled by using the prepared porous membrane with hierarchical pore structure, in which the catalytic layer is activated carbon felt, the bipolar plate is graphite plate, and the effective area of ​​the membrane is 9cm 2 , the current density is 80mA.cm -2 , the vanadium ion concentration in the electrolyte is 1.50mol L -1 , H 2 SO ...

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Abstract

The invention relates to a porous membrane for a flow battery and with a hierarchical pore structure, and preparation and application thereof. According to the invention, one or more selected from a group consisting of organic polymer resin or sulfonated polymer resin are used as raw materials; a porous membrane prepared with micromolecular particles as a hard template is used as a matrix; an immerged phase inversion process is employed for curing and film formation; and a template agent is removed so as to prepare the porous membrane with the hierarchical pore structure. The porous membrane with the hierarchical pore structure is simple and environment-friendly to prepare, and has controllable pore size and porosity, and batch production of the porous membrane with the hierarchical pore structure can be easily realized. Compared with the original porous membrane, the porous membrane with the hierarchical pore structure has the advantage that the pore structure can be controlled by controlling the content of the template agent; and a battery prepared from the porous membrane with the hierarchical pore structure has good capacity retention ratio and battery efficiency.

Description

technical field [0001] The invention relates to a porous membrane material with a hierarchical pore structure for a liquid flow battery, in particular to a porous membrane with a hierarchical pore structure prepared based on a template method and its application in an all-vanadium redox flow battery. 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 (Vanadium flow battery, VFB) is considered to have good application prospects due to its advantages o...

Claims

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Application Information

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IPC IPC(8): H01M8/0239H01M8/18
CPCH01M8/0239H01M8/188Y02E60/50
Inventor 李先锋张华民袁治章赵于月
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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