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Preparation method of polybenzimidazole/free radical quenching agent composite film

A polybenzimidazole and benzimidazole technology, applied in electrical components, circuits, battery pack components and other directions, can solve problems such as battery performance decline, aggravate PBI film degradation, etc., achieve high electrical conductivity, improve chemical stability and Durability, easy operation effect

Inactive Publication Date: 2017-01-18
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

These free radicals generated will aggravate the degradation of the PBI film, resulting in a significant drop in battery performance

Method used

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  • Preparation method of polybenzimidazole/free radical quenching agent composite film
  • Preparation method of polybenzimidazole/free radical quenching agent composite film
  • Preparation method of polybenzimidazole/free radical quenching agent composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 0.2203g of PBI resin, dissolve it in 19.2668g of NMP, stir for 12h, and filter twice with suction to remove impurities. Weigh 0.0045gCeO 2 , added to the PBI solution, stirred for 1 h, and sonicated for 2 h. PBI / CeO 2 Pour the casting liquid into a 9*10cm mold, and keep it in a drying oven at 80°C for 24 hours to obtain uniform and dense PBI / CeO 2 Composite film. Cut a composite film with a thickness of 36 μm to a size of 3.5*3.5 cm and a mass of 0.0441 g. Immerse in 80wt.% phosphoric acid at 80°C for 24 hours. After taking out the membrane, blot the excess acid on the surface of the membrane with filter paper, weigh it, and prepare the PBI / CeO 2 - The mass of the PA composite membrane is 0.1358g, and the phosphoric acid loading is 2.08. The length and width elongation of the composite film were both 12.5%.

[0036] PBI / CeO 2 -CeO in PA composite film 2 The load is 2.04%.

[0037] Testing PBI / CeO by Impedance Impedance Method (EIS) 2 -The electrical con...

Embodiment 2

[0039] Weigh 0.2103g of PBI resin, dissolve in 20g of NMP, stir for 12h, and filter twice with suction to remove impurities. Weigh 0.0084gCeO 2 , added to the PBI solution, stirred for 1 h, and sonicated for 2 h. PBI / CeO 2 Pour the casting liquid into a 9*10cm mold, and keep it in a drying oven at 80°C for 24 hours to obtain uniform and dense PBI / CeO 2 Composite film. Cut a composite film with a thickness of 30 μm to a size of 4*4cm and a mass of 0.0440g. Immerse in 80wt.% phosphoric acid at 80°C for 24 hours. After taking out the membrane, blot the excess acid on the surface of the membrane with filter paper, weigh it, and prepare the PBI / CeO 2 - The mass of the PA composite film is 0.1423g, the thickness becomes 50μm, and the phosphoric acid loading is 2.23. The length and width elongation of the composite film were both 25%. PBI / CeO 2 -CeO in PA composite film 2 The load is 4.0%.

[0040] Testing PBI / CeO by Impedance Impedance Method (EIS) 2 -The electrical condu...

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Abstract

The invention relates to a high temperature proton exchange membrane fuel cells, in particular to a preparation method of a polybenzimidazole / free radical quenching agent composite film. The method includes: dissolving polybenzimidazole resin in a high-boiling point solvent, adding a free radical quenching agent, and preparing a polybenzimidazole / free radical quenching agent film by solution casting, and soaking the film in phosphoric acid. The film has high conductivity, because of the existence of the free radical quenching agent, the resistance of the composite film to free radical attack in a high temperature fuel cell can be effectively improved, and the degradation rate can be effectively reduced. The polybenzimidazole / free radical quenching agent film has potential application prospects in high temperature proton exchange membrane fuel cells.

Description

technical field [0001] The invention relates to a preparation method of a polybenzimidazole composite membrane for a high-temperature proton exchange membrane fuel cell without humidification of the intake air, in particular to a preparation of a polybenzimidazole / phosphoric acid composite membrane containing a free radical quencher method. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a high-efficiency, clean, and environment-friendly power generation device. It is an ideal power source for electric vehicles. application prospects. However, the widely used The representative perfluorinated sulfonic acid membrane fuel cell, but the proton conductivity of this type of proton exchange membrane is greatly affected by the water content and temperature in the membrane. Due to the limitations, it faces problems such as poor CO tolerance and difficult water and heat management of the system in practical application. Therefore, increasing the opera...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L79/04C08K3/22H01M2/14
CPCY02E60/10
Inventor 邵志刚郝金凯姜永燚王禛赵亚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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