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A method for preparing ion-exchange membrane based on polybenzimidazole porous polymer by non-solvent-induced phase inversion method and its application

A technology of porous polymer and ion exchange membrane, applied in the direction of organic diaphragm, etc., to achieve the effect of thin skin layer, good thermal stability and mechanical properties, and uniform pore size

Active Publication Date: 2021-10-08
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This makes the electrode spacing less than 100mm, that is, the battery design in which the gas diffusion type electrode is in direct contact with the membrane becomes possible (J.HydrogenEnergy., 2011, 36, 15089), so anion exchange membranes based on quaternary ammonium salt functionalized polymers have recently received a lot of attention. Much attention has been paid, but improving polymer backbone structures for improved long-term stability as well as anion-exchange moieties in the hydroxide ionomer form remains a formidable challenge

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  • A method for preparing ion-exchange membrane based on polybenzimidazole porous polymer by non-solvent-induced phase inversion method and its application
  • A method for preparing ion-exchange membrane based on polybenzimidazole porous polymer by non-solvent-induced phase inversion method and its application
  • A method for preparing ion-exchange membrane based on polybenzimidazole porous polymer by non-solvent-induced phase inversion method and its application

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Effect test

Embodiment 1

[0038] A kind of method adopting non-solvent-induced phase inversion method to prepare based on polybenzimidazole porous polymer ion-exchange membrane comprises the following steps:

[0039] 1. Preparation of uniform film-forming solution.

[0040] This step is specifically as follows: dissolving polybenzimidazole (mPBI) in DMAc at room temperature and stirring for 1 hour to prepare a 12.5 wt% uniform and transparent casting solution.

[0041] 2. Preparation of porous polybenzimidazole polymer electrolyte separator by non-solvent-induced phase inversion method.

[0042] The step is as follows: spread the PBI homogeneous solution with a concentration of 12.5wt% on a glass plate to form a solution film with an average thickness of 40±10 μm, and then quickly place the glass plate with the liquid film in ethanol for 3 minutes. Afterwards, the glass plate was taken out and immersed in 3 liters of deionized water at room temperature for 30 minutes, and the porous membrane was washe...

Embodiment 2

[0049] A kind of method adopting non-solvent-induced phase inversion method to prepare based on polybenzimidazole porous polymer ion-exchange membrane comprises the following steps:

[0050] 1. Preparation of uniform film-forming solution.

[0051] This step is specifically as follows: dissolving polybenzimidazole (mPBI) in DMAc at room temperature and stirring for 1 hour to prepare a 12.5 wt% uniform and transparent casting solution.

[0052] 2. Preparation of porous polybenzimidazole polymer electrolyte separator by non-solvent-induced phase inversion method.

[0053] This step is specifically as follows: spread the uniform solution of PBI with a concentration of 12.5wt% on a glass plate to form a solution film with an average thickness of 40±10 μm, and then quickly place the glass plate with the liquid film in ethyl acetate for 3 minutes. Afterwards, the glass plate was taken out and immersed in 3 liters of deionized water at room temperature for 30 minutes, and the porous...

Embodiment 3

[0056] A kind of method adopting non-solvent-induced phase inversion method to prepare based on polybenzimidazole porous polymer ion-exchange membrane comprises the following steps:

[0057] 1. Preparation of uniform film-forming solution.

[0058] This step is specifically as follows: dissolving polybenzimidazole (mPBI) in DMAc at room temperature and stirring for 1 hour to prepare a 12.5 wt% uniform and transparent casting solution.

[0059] 2. Preparation of porous polybenzimidazole polymer electrolyte separator by non-solvent-induced phase inversion method.

[0060] The step is as follows: spread the PBI homogeneous solution with a concentration of 12.5wt% on a glass plate to form a solution film with an average thickness of 40±10 μm, and then quickly place the glass plate with the liquid film in dichloromethane for 3 minutes. Afterwards, the glass plate was taken out and immersed in 3 liters of deionized water at room temperature for 30 minutes, and the porous membrane w...

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Abstract

The invention discloses a method for preparing an ion-exchange membrane based on a polybenzimidazole porous polymer by using a non-solvent-induced phase inversion method and its application in an alkaline water electrolyzer. One or more kinds of organic high molecular polymers are used as raw materials and prepared by a non-solvent-induced phase inversion method. This kind of porous membrane can realize the transfer of ion exchange without the need of ion exchange groups. Porous membranes with high porosity, high solvent uptake, fast electrolyte wetting, and high mechanical strength can be prepared by a fast non-solvent-induced phase inversion method. The porous film prepared by the invention is applied in the alkaline water electrolyzer after alkali doping, exhibits high ion conductivity and stable mechanical properties, and has a very good application prospect in the alkaline water electrolyzer.

Description

technical field [0001] The invention belongs to the technical field of alkaline water electrolyzer, relates to a porous polymer ion exchange membrane material, in particular to a method for preparing a polybenzimidazole-based porous polymer ion exchange membrane using a non-solvent-induced phase inversion method and its application . Background technique [0002] At present, electrochemical energy storage technology (that is, the storage of renewable energy surplus electricity in the form of hydrogen by splitting water electrochemically) has received more and more attention (IEEE, 2012, 100, 410). Proton exchange membrane (PEM) systems based on perfluorosulfonic acid membranes can produce high-purity hydrogen at high current densities, but are limited by electrode materials and catalysts in acidic environments, which hinders their large-scale application, making People began to turn to the traditional alkaline water electrolyzer technology. Under alkaline conditions, the re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08J5/22C08L79/04C25B13/08
CPCC08J5/2256C08J5/2262C08J9/286C08J2379/04C25B13/08
Inventor 李南文胡旭黄瑛达
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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