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Multi-layer polyelectrolyte membranes

A polyelectrolyte, polymer technology, applied in solid electrolyte fuel cells, circuits, membrane technology, etc., can solve problems involving stability, strength and cost

Inactive Publication Date: 2013-08-14
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the membranes used in these fuel cells work well, prior art membranes still suffer from disadvantages related to stability, strength and cost

Method used

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  • Multi-layer polyelectrolyte membranes
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  • Multi-layer polyelectrolyte membranes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0345] Example 1. PFCB and PFSA surface layer, 3 layers, coated together (AT)

[0346] Figure 5 is an optical image of a film with one PFCB-containing layer and two PFSA skin layers. refer to Figure 5 , were coated with 20 wt% DMAc solution from bottom to top, respectively (DE2020) (1.48-μm thick), perfluorocyclobutane (PFCB) (5.9-μm thick) coated with 11 wt% DMAc (N,N-dimethylacetamide) solution and coated with 20 wt% DMAc solution Covered (DE2020) (2.42 μm-thick). The total film thickness is about 10-12 μm thick. Coating details are as follows:

[0347] 1) The Ericsson coater was set at 40°C, with a clean glass plate or a piece of fluorinated ethylene-propylene (FEP)-coated polyimide backer film sheet as a vacuum platen ( The base on the vacuum platen);

[0348]2) Place a set of coating Bird applicators in the following order: one, 3 mil (10" coat width) applicator with masking tape shim, one, with Mylar (32mm- thick) 3 mil (9" coat width) applicator with spacer...

Embodiment 2

[0350] Example 2. PFCB and PFSA surface layer, 3 layers, layer by layer coating (LBL)

[0351] Figure 6 Optical images of films with one PFCB-containing layer and two PFSA skin layers are provided. refer to Figure 6 , were coated with 20 wt% DMAc solution from bottom to top, respectively (DE2020) (3.31-μm thick), perfluorocyclobutane (PFCB) (6.7-μm thick) coated with 11 wt% DMAc solution and (DE2020) (3.6-μm thick). The total film thickness is about 13-14-μm thick. Coating details are as follows:

[0352] 1) The coater was set at 40°C, with a clean glass plate or a piece of fluorinated ethylene-propylene (FEP)-coated polyimide base film sheet as the substrate on the vacuum platen. The coating speed was set at 12.5 mm / s and the coating direction was from left to right.

[0353] 2) The first floor (DE2020) Apply with a 1 mil Bird applicator (8" coat width) and dry at 40°C;

[0354] 3) The second PFCB ionomer layer was coated with a 3 mil Bird applicator (9" coating...

Embodiment 3

[0357] Example 3. PFCB and PFSA surface layer, layer by layer coating (LBL), ePTFE support in the middle

[0358] Figure 7 Optical images of membranes with one PFCB-containing layer and two PFSA skin layers and one ePTFE (expanded polytetrafluoroethylene) support layer are provided. The coated substrate used in this example was a 26-μm-thick polyimide film with a 2-μm-thick fluorinated ethylene-propylene (FEP) topcoat on both sides (total substrate film thickness is 30 μm). refer to Figure 7 , from bottom to top were coated with 10wt% isopropanol (IPA) solution (DE2020) (1.61-μm thick), perfluorocyclobutane (PFCB) (5.17-μm thick) coated with a 7 wt% DMAc solution, followed by ionomer-filled expanded polytetrafluoroethylene (ePTFE) Membranes of the support layer (3.84-μm thick) and coated with 5 wt% isopropanol solution (DE2020) (1.07-μm thick). The total film thickness is about 12-μm thick. Coating details are as follows:

[0359] 1) The coater was set at room temp...

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PUM

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Abstract

A multilayer polyelectrolyte membrane for fuel cell applications includes a first perfluorocyclobutyl-containing layer that includes a polymer having perfluorocyclobutyl moieties. The first layer is characteristically planar having a first major side and a second major side over which additional layers are disposed. The membrane also includes a first PFSA layer disposed over the first major side of the first layer and a second PFSA layer disposed over the second major side of the first layer.

Description

technical field [0001] In at least one aspect, the invention relates to ion-conducting membranes for use in fuel cells, particularly ion-conducting membranes having a multilayer structure. Background technique [0002] Fuel cells are used as electrical energy sources in many applications. In particular, it is proposed to use fuel cells in automobiles instead of internal combustion engines. Commonly used fuel cell designs use solid polymer electrolyte ("SPE") membranes or proton exchange membranes ("PEM") to provide ion transport between the anode and cathode. [0003] In a proton exchange membrane type fuel cell, hydrogen is supplied to an anode as a fuel, and oxygen is supplied to a cathode as an oxidant. Oxygen can be pure oxygen (O 2 ) or air (O 2 and N 2 mixture). PEM fuel cells typically have a membrane electrode assembly ("MEA") in which a solid polymer membrane has an anode catalyst on one side and a cathode catalyst on the opposite side. The anode and cathode ...

Claims

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Application Information

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IPC IPC(8): H01M8/10
CPCH01M8/1023Y02E60/521B01D71/32H01M8/1039H01M8/1053H01M8/1025H01M8/1081Y02E60/50Y02P70/50
Inventor L·邹S·C·穆斯T·J·富勒
Owner GM GLOBAL TECH OPERATIONS LLC
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