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Organic composite high-temperature proton exchange membrane and preparation method thereof

A proton exchange membrane and composite technology, applied in the field of organic composite high-temperature proton exchange membrane and its preparation, can solve the problems of complex water and heat management of batteries, PEM dehydration, and affecting battery performance stability

Active Publication Date: 2017-06-06
SHANGHAI INST OF ORGANIC CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Perfluorosulfonic acid membranes (PFSA, such as the Nafion membrane produced by Dupont Company) are widely used as proton exchange membranes in traditional PEMFC. It leads to dehydration of PEM, a sharp drop in proton conductivity, and severe degradation of battery performance.
The lower operating temperature brings various disadvantages to PEMFC, such as the catalyst is easily poisoned by impurity gases such as CO, and the water and heat management of the battery is complicated. These disadvantages have become the bottleneck of its development.
[0004] At present, the widely used high-temperature proton exchange membrane is the PBI (polybenzimidazole) type proton exchange membrane, but because the membrane is used together with inorganic phosphoric acid, it has obvious disadvantages: (a) because the system relies on phosphoric acid to conduct Protons, so the stability of phosphoric acid content directly affects the stability of battery performance
However, as the adsorption amount of phosphoric acid increases, the mechanical stability and oxidation resistance of the membrane decrease, resulting in a decrease in the service life of the membrane.
Therefore, in the actual use process, only the proton conductivity of the membrane and the mechanical strength of the membrane can be considered comprehensively.

Method used

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  • Organic composite high-temperature proton exchange membrane and preparation method thereof
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[0059] Preparation of Composite High Temperature Proton Exchange Membrane

[0060] In a preferred embodiment of the present invention, the preparation method of the composite high-temperature proton exchange membrane is as follows:

[0061] Provide polybenzimidazole type compound A and strong basic polymer B;

[0062] Under the protection of an inert gas, dissolve the mixture of the two in an organic solvent to form a mixed solution with a certain solid content;

[0063] Remove the insolubles by filtration to obtain a mixed filtrate;

[0064] Degassing the mixed filtrate;

[0065] The degassed mixed filtrate is formed into a membrane to obtain a composite high-temperature proton exchange membrane.

[0066] In a preferred embodiment of the present invention, the molar ratio of the polybenzimidazole type compound A to the strongly basic polymer B is 1:0.1-20.

[0067] In a preferred embodiment of the present invention, the organic solvent is a strong polar organic solvent, m...

Embodiment 1

[0079] Preparation of m-PBI and 3,5-polypyridine (molar ratio 1:0.1) composite membrane:

[0080]

[0081] According to the molar ratio of 1:0.1, dry m-PBI (616.7mg, 2mmol) and 3,5-polypyridine (15.4mg, 0.2mmol) were weighed. Under the protection of nitrogen, the mixture of the two was dissolved in dry DMSO (dimethyl sulfoxide, 12.010g) to form a solution with a solid content of 5%, filtered to remove insoluble matter, and the filtrate was degassed After treatment, it was cast onto a glass plate of 10×10 cm, and then placed in a blast oven to dry at 80°C for two hours, and then further heated to 120°C for one hour to obtain a composite high-temperature proton exchange membrane. The thickness of this film is 24 μ m (micrometer), DSC test (results such as figure 1 shown in ) shows its glass transition temperature T g =365°C, the mechanical property test shows that its tensile strength is 103MPa.

[0082] It is known that the tensile strength of the film prepared by m-PBI i...

Embodiment 2

[0085] Preparation of p-PBI and 2,6-polypyridine (molar ratio 1:0.2) composite membrane:

[0086]

[0087] According to the molar ratio of 1:0.2, dry p-PBI (616.7mg, 2mmol) and 2,6-polypyridine (30.8mg, 0.4mmol) were weighed. Under the protection of nitrogen, the mixture of the two was dissolved in dry DMAC (N,N-dimethylacetamide, 10.144g) to form a solution with a solid content of 6%, filtered, and the insoluble matter was filtered off. After degassing, the filtrate was cast onto a 10×10cm glass plate, and then dried in a blast oven at 80°C for two hours, and then further heated to 120°C for one hour to obtain a composite high-temperature proton exchange membrane.

[0088] The thickness of this film is 25 μ m (micrometer), DSC test (results such as figure 2 shown in ) shows its glass transition temperature T g =360°C, the mechanical property test shows that its tensile strength is 101MPa.

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Abstract

The invention relates to an organic composite high-temperature proton exchange membrane and a preparation method of the membrane. Particularly, the organic composite high-temperature proton exchange membrane is formed by compositing a polybenzimidazole compound A and a strong-base polymer B as raw materials at a mole ratio of 1:(0.01-99.99). The invention further provides the preparation method of the high-temperature proton exchange membrane. The high-temperature proton exchange membrane has high proton conductivity and high mechanical strength and is very suitable for a proton exchange membrane fuel cell.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to an organic composite high-temperature proton exchange membrane and a preparation method thereof. Background technique [0002] Fuel cells are recognized as high-efficiency energy conversion devices that convert chemical energy into electrical energy, and are an ideal technology for utilizing hydrogen energy to alleviate the fossil energy crisis. Among many types of fuel cells, proton exchange membrane fuel cell (PEMFC) has become the most practical and commercial fuel cell due to its high specific energy and specific power, fast cold start and environmental friendliness. There are more and more applications in the fields of transportation, distributed power generation and household cogeneration, which are valued by governments, universities, energy research institutions, automobile manufacturers and gas companies. Increasing the working temperature of PEMFC is one...

Claims

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Application Information

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IPC IPC(8): H01M8/124
CPCH01M8/124H01M2300/0082Y02E60/50
Inventor 胡金波何正标陈佳孝祝传贺邓玲
Owner SHANGHAI INST OF ORGANIC CHEMISTRY - CHINESE ACAD OF SCI
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