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Ionic liquid-based composite alkaline electrolyte membrane with electrostatic interaction, and preparation and application thereof

An ionic liquid, electrolyte membrane technology, applied in circuits, fuel cells, electrical components, etc., can solve problems such as the degradation of alkaline membrane performance

Active Publication Date: 2020-06-19
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

[0003] Aiming at the performance degradation of alkaline membranes under high temperature and low humidity environment, the purpose of this invention is to design and prepare a class of alkaline electrolytes with good chemical stability and high conductivity, so that they can be used at >90°C or even higher temperatures; Characterize and test the physicochemical and electrochemical properties of such alkaline electrolytes

Method used

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  • Ionic liquid-based composite alkaline electrolyte membrane with electrostatic interaction, and preparation and application thereof
  • Ionic liquid-based composite alkaline electrolyte membrane with electrostatic interaction, and preparation and application thereof
  • Ionic liquid-based composite alkaline electrolyte membrane with electrostatic interaction, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Add 20g of N-methylimidazole and 40mL of bromoethane into a 100mL single-necked round bottom flask, and react at room temperature for 6h to obtain 1-methyl-3-ethylimidazolium bromide. Dissolve 100g LiTFSI in 1L deionized water, add the 1-methyl-3-ethylimidazolium bromide prepared above into the LiTFSI / water solution, stir thoroughly at room temperature for 36h, separate the liquids, and then use 50g LiTFSI / 1L The aqueous solution was treated once, and after liquid separation, it was dried in a vacuum oven at 120°C for 48 hours, and vacuum was drawn once every 4 hours during drying.

[0048] Dissolve 5 g of the above-prepared 1-methyl-3-ethylimidazole TFSI type ionic liquid in 1 mL of ethanol, and add it to 5 mL to a concentration of 0.2 g mL -1 In the Nafion / ethanol solution, the gel-like substance was obtained, filtered, dried at 40°C for 30min under vacuum, placed in a PTFE film, placed between two steel plates, and hot-pressed at 5000Pounds and 100°C for 1h to obtain...

Embodiment 2

[0056] Add 25g of methylpiperidine and 30mL of bromoethane into a 100mL single-necked round bottom flask, and react at 70°C for 2h to obtain N-methyl-ethylpiperidine bromide. Dissolve 10g of N-methyl-ethylpiperidine bromide prepared in 10mL of water, add 50g LiTFSI / 1L deionized aqueous solution to it, stir thoroughly for 36h, separate the liquids, and then treat with 20g LiTFSI / 300mL LiTFSI / water solution 28h, after liquid separation, dry in a vacuum oven at 120°C for 48h.

[0057] The N-methyl-ethylpiperidine TFSI-type ionic liquid prepared above was dissolved in different volumes of ethanol to obtain four solutions with concentrations of 1:10, 1:8, 1:3, and 1:0 g / mL. The Nafion membrane with short side chains was placed in the above four parts of ionic liquid / ethanol solution in turn for 4 hours, and the prepared alkaline electrolyte membrane with ionic liquid with electrostatic effect was hot-pressed at 1000 Pounds for 0.5 h at 100°C to finally obtain electrostatic A relat...

Embodiment 3

[0059] Add 25g of methylpiperidine and 30mL of bromoethane into a 100mL single-necked round bottom flask, and react at 70°C for 2h to obtain N-methyl-ethylpiperidine bromide. Dissolve 10 g of N-methyl-ethylpiperidinium bromide prepared in 15 mL of acetone, add 20 g of NaBF 4 / 250mL acetone solution, stirred for 36h, and then used the same method in 20g NaBF 4 / 250mL acetone solution for 4 times, the liquid was filtered and evaporated to remove acetone, and finally dried in a vacuum oven at 120°C for 36h.

[0060] Add 2g of polyetheretherketone into a round bottom flask, pour 20mL of concentrated sulfuric acid into it, and keep stirring at room temperature for 24h to complete the sulfonation reaction. The obtained purple solution is slowly poured into ice water, and the polymer obtained after filtration is passed through Na with a mass concentration of 1%-5% (3%) 2 CO 3 The solution was washed several times (here 5 times) and then washed with water until the pH was neutral, ...

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Abstract

The invention belongs to the field of alkaline electrolyte membranes, and the invention also relates to a composite alkaline electrolyte membrane based on the electrostatic interaction of the ionic liquid. The membrane is composed of an organic polymer skeleton and the ionic liquid. The ionic liquid is adsorbed on an organic polymer skeleton by virtue of electrostatic interaction; and the alkalineelectrolyte membrane has good chemical stability and high conductivity, and can be used in a high-temperature (more than 90 DEG C) environment.

Description

technical field [0001] The invention belongs to the field of alkaline electrolyte membranes; the invention also relates to the preparation of an alkaline electrolyte membrane with good chemical stability, high electrical conductivity and high temperature (>90° C.). Background technique [0002] Alkaline polymer electrolyte membrane fuel cells (APEMFCs) with alkaline polymer membranes as solid electrolytes have fast cathode reaction kinetics, can use non-noble metals as electrocatalysts, and can effectively avoid dendrite short circuits caused by salt deposition. and other advantages. Since it was first reported in 2005, it has become one of the research hotspots in the field of fuel cells. As one of the key materials for alkaline fuel cells, alkaline polymer electrolyte membranes have been extensively studied and made great progress. Through molecular structure design, a continuous and obvious microscopic phase separation structure was constructed in APEMs, and a channe...

Claims

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Application Information

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IPC IPC(8): H01M8/1048H01M8/1086H01M8/1088
CPCH01M8/1048H01M8/1088H01M8/1093Y02E60/50
Inventor 王素力杨丛荣孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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