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High-temperature proton exchange compound film

A proton exchange and composite membrane technology, applied in the field of composite membranes, can solve the problems of non-continuous production, time-consuming, high strength, etc., and achieve the effects of reducing internal resistance, increasing electrical conductivity, and increasing output power

Active Publication Date: 2010-06-09
SHANDONG DONGYUE WEILAI HYDROGEN ENERGY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is not suitable for continuous production due to the time-consuming transformation process
[0008] US Patent US RE37701 describes the invention of compounding ionic polymers and expanded tetrafluoroethylene membranes into composite membranes, but the thickness of the expanded tetrafluoroethylene membranes they use is greater than 20 microns, which cannot be compared with the development trend of modern fuel cells and the thickness is thinner , with higher strength corresponding to
Therefore, it cannot adapt to the conditions of use of high-temperature proton exchange membrane fuel cells.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]Get a 5-micron polytetrafluoroethylene membrane (80% porosity, 0.5-3 microns in aperture) and immerse in 5% perfluorosulfonic acid resin propanol-water solution, wherein the structural formula of perfluorosulfonic acid resin is

[0043]

[0044] n=1, p=2, ion exchange capacity 0.97mmol / g, molecular weight 190,000.

[0045] Then, the wet film sample was dried in an oven at 140° C. for 30 seconds. In order to completely block the pores in the membrane, this process step can be repeated more than 2 times. Finally, the composite membrane was treated at 190° C. for 30 minutes to obtain a composite membrane with a thickness of 8 μm, and then boiled in 5% sulfuric acid for 30 minutes under normal pressure to obtain a 5 μm composite membrane.

Embodiment 2

[0047] Take a 10-micron thick biaxially stretched polytetrafluoroethylene film (89% porosity, 0.2-2 micron diameter), and fix it on a flat plate. A 15% perfluorosulfonic acid resin isopropanol-water solution is coated on one side of the polytetrafluoroethylene membrane, so that the perfluorosulfonic acid resin solution completely fills the pore volume in the membrane, so that all pores are completely blocked. Wherein the structural formula of perfluorosulfonic acid resin is

[0048]

[0049] n=1, p=2, ion exchange capacity 1.05mmol / g molecular weight 210,000.

[0050] The coated film samples were dried in a drying oven at 100° C. for 15 minutes. In order to completely block the pores in the membrane, the coating and drying process can be repeated more than 2 times. Then the drying temperature was raised to 210° C. and dried for 5 minutes. Then boil in 5% sulfuric acid under normal pressure for 60 minutes to obtain a 12-micron composite membrane.

Embodiment 3

[0052] An 8-micron thick biaxially stretched polyvinylidene fluoride film (porosity 75%, pore diameter 5 microns) was fixed on a flat plate. 24% perfluorosulfonic acid resin isopropanol-propanol-water solution is coated on both sides of the polyvinylidene fluoride film by screen printing, wherein the structural formula of perfluorosulfonic acid resin is

[0053]

[0054] n=0, p=2, ion exchange capacity 1.35mmol / g, molecular weight 240,000.

[0055] The film was then dried in an oven at 160° C. for 40 minutes. Then, the dried film after drying was taken out and boiled in distilled water for 30 minutes to swell the film to obtain a 10 micron composite film.

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Abstract

The invention relates to a high-temperature proton exchange compound film. The film is formed by using a fluorine-containing thin polymer film having a cellular structure as a carrier, filling a perfluor resin having a function of ion exchange into the micro-pores of a micro-porous film and covering the surface of the micro-porous film, wherein the compound film is 5 to 15 microns thick. The fluorine-containing thin polymer film having a cellular structure is a polyfluortetraethylene porous film, a polyvinylidene fluoride porous film, a polytrifluorochloroethylene porous film or a polyfluortetraethylene ethylene porous film. The perfluor resin having a function of ion exchange is a perfluor sulfo resin, a perfluor carboxylic resin or a perfluor phosphoric resin. The compound film of the invention is thin and can be applied to a fuel cell having a decreased internal resistance in order to promote the output power of the cell.

Description

technical field [0001] The invention relates to a high-temperature proton exchange membrane, in particular to a composite membrane composed of a fluorine-containing ion polymer and a porous membrane. Background technique [0002] Proton exchange membrane fuel cell is a power generation device that directly converts chemical energy into electrical energy by electrochemical means, and is considered to be the preferred clean and efficient power generation technology in the 21st century. Proton exchange membrane (proton exchange membrane, PEM) is the key material of proton exchange membrane fuel cell (proton exchange membrane fuel cell, PEMFC). [0003] The currently used perfluorosulfonic acid proton exchange membrane has good proton conductivity and chemical stability at lower temperature (80°C) and higher humidity. However, they also have many disadvantages such as poor dimensional stability, low mechanical strength, and poor chemical stability. The water absorption rate of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M2/16C08L27/18C08L27/16C08L27/12C08L23/08C08L29/10H01M8/1041
CPCY02E60/12Y02E60/50
Inventor 张永明唐军柯刘萍张恒王军
Owner SHANDONG DONGYUE WEILAI HYDROGEN ENERGY MATERIAL CO LTD
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