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Use of crosslinking type polybenzimidazole porous separating membrane in liquid flow battery

A polybenzimidazole and porous separation membrane technology, which is applied to fuel cell components, fuel cells, collectors/separators, etc., can solve the problems of poor ion selectivity, limited application, and high price, and achieve controllable pore size , Solve the effect of capacity attenuation and low cost

Inactive Publication Date: 2015-06-17
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

At present, the membrane materials used at home and abroad are mainly Nafion membrane developed by DuPont of the United States. Nafion membrane has excellent performance in terms of electrochemical performance and service life, but due to its high price and poor ion selectivity, the application of the membrane is limited. Applications in Flow Batteries

Method used

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  • Use of crosslinking type polybenzimidazole porous separating membrane in liquid flow battery
  • Use of crosslinking type polybenzimidazole porous separating membrane in liquid flow battery
  • Use of crosslinking type polybenzimidazole porous separating membrane in liquid flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Dissolve 10 g of polybenzimidazole (weight average molecular weight about 50,000) with the following structure in 50 ml of N,N-dimethylacetamide to make a 20% polymer solution. The solution was cast onto a glass plate and flattened with a casting knife. Then quickly immersed in 5L water, solidified for 5 minutes to form a porous separation membrane ( figure 1 ), to obtain a porous membrane of polybenzimidazole. The porous separation membrane of polybenzimidazole was cross-linked in 5% methanol solution of p-dichlorobenzylbenzene for 24 hours to obtain a cross-linked polybenzimidazole membrane.

[0044]

[0045] n represents the number of structural units of the polymer, 10≤n≤200.

[0046] in figure 2 The cross-sectional electron microscope picture of the solvent-resistant nanofiltration membrane prepared in Example 1 is given. The membrane material exhibits a traditional finger-like pore structure. The cross-linked polybenzimidazole porous separation membrane pre...

Embodiment 2

[0050] Dissolve 3.4 grams of phosphorus pentoxide in 34 grams of polyphosphoric acid, add it to a 500ml three-necked flask, heat up and stir to form a clear solution, then add 6mmol of biphenyltetramine, 6mmol of 4,4'-dicarboxydiphenyl ether, Stir and heat up to 200°C, react for 20 hours, cool down, and pour into a 5% sodium hydroxide solution. After standing for 24 hours, wash well with water until the solution is neutral. Filter and dry. The prepared polymer was dissolved in DMAC to prepare a 15wt% solution, and the solution was cast onto a glass plate and flattened with a casting knife. Then quickly immersed in 5L of water, solidified for 5 minutes to form a porous separation membrane to obtain a porous membrane of polybenzimidazole. The porous separation membrane of polybenzimidazole was cross-linked in 5% methanol solution of p-dichlorobenzylbenzene for 24 hours to obtain a porous separation membrane with the following chemical structure.

[0051]

[0052] In the em...

Embodiment 3

[0055] Same as Example 1, the polybenzimidazole structure is replaced with the following structure, and the weight average molecular weight is about 50,000.

[0056]

[0057] In the embodiment, n represents the number of structural units of the polymer, and 10≤n≤200.

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Abstract

The invention relates to use of a crosslinking type polybenzimidazole porous separating membrane in a liquid flow battery, and the porous membrane material is a crosslinking type polybenzimidazole polymer material. The porous membrane prepared by the invention is used in the liquid flow battery, by use of a cross-linking method and controlling of the crosslinking reaction, the membrane material oxidation stability and ion selectivity can be improved, the function of an ion exchange membrane in the liquid flow battery can be realized, the problem of capacity attenuation of a porous diaphragm can be effectively solved, the aperture of the porous membrane can be further regulated by change of variety of the polymer and the crosslinking agent of the composite membrane, ion selectivity of the porous membrane can be effectively improved, and the membrane material has the advantages of simple preparation method, controllable pore size, low cost, and easy implementation of large batch production.

Description

technical field [0001] The invention relates to a porous separation membrane, in particular to the application of the porous separation membrane in a liquid flow battery. Background technique [0002] Liquid flow battery is a new electrochemical energy storage technology. Compared with other energy storage technologies, it has high energy conversion efficiency, flexible system design, large storage capacity, free site selection, 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 of high safety, good stability, high efficiency, long life (life > 15 years), and low cost. [0003] The battery separator is an important part of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02C08J9/00C08J3/24C08G73/06H01M8/0202H01M8/023H01M8/0239
CPCH01M8/0239H01M8/188Y02E60/50
Inventor 李先锋张华民段寅琦
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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