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Electrolyte film - electrode assembly

An electrode assembly, electrolyte membrane technology, applied in battery electrodes, solid electrolyte fuel cells, solid electrolytes, etc., can solve the problems of insufficient power generation performance of fuel cells, deterioration of flood resistance, etc., and achieve suppression of cathode flooding and drought. , to ensure the effect of discharge

Inactive Publication Date: 2015-01-21
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the MEA described in Patent Document 1, although the drought resistance is improved by the provision of the water retention layer, the flooding resistance under wet conditions is deteriorated.
Therefore, the power generation performance of the fuel cell using the MEA described in Patent Document 1 is insufficient.

Method used

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  • Electrolyte film - electrode assembly
  • Electrolyte film - electrode assembly
  • Electrolyte film - electrode assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142] The preparation contains flake graphite (plane diameter (D): 15 μm, thickness (H): 0.1 μm, aspect ratio (D / H): 150, specific surface area: 6m 2 / g), Ketjen Black EC600JD (manufactured by LION, primary particle size: 34nm, specific surface area: 1270m 2 / g), PTFE ink (also contains surfactant, thickener). This ink was applied to a carbon paper (manufactured by Mitsubishi Rayon Co., Ltd., thickness: 160 μm) on which a fine porous layer (thickness: 45 μm) had been formed and water-repellent treated with 10 wt % PTFE. After coating, it was dried at 80° C. for 30 minutes, and further baked at 330° C. for 30 minutes to obtain an anode gas diffusion layer 1 (specification A) having a flaky graphite layer (anode fine porous layer) with a thickness of 60 μm. At this time, the relative gas diffusion coefficient of the anode fine porous layer was 0.15 [−]. In addition, the tortuosity of the anode microporous layer and the effective diffusion coefficient of water vapor (300K) wer...

Embodiment 2

[0146] Prepared respectively with the ratio of 61.3wt%, 8.8wt%, 30wt% graphite flakes (plane diameter (D): 15 μm, thickness (H): 0.1 μm, aspect ratio (D / H): 150, specific surface area : 6m 2 / g), acetylene black (manufactured by Denki Kagaku Kogyo Co., Ltd., primary particle size: 40nm, specific surface area: 37m 2 / g), PTFE ink (also contains surfactant, thickener). This ink was applied to carbon paper (manufactured by Mitsubishi Rayon Co., Ltd., thickness: 160 μm) subjected to a water-repellent treatment with 10 wt % of PTFE. After coating, it was dried at 80° C. for 30 minutes, and then baked at 330° C. for 30 minutes to obtain an anode gas diffusion layer 2 (specification C ). At this time, the relative gas diffusion coefficient of the anode fine porous layer was 0.16 [−]. In addition, the tortuosity of the anode microporous layer and the effective diffusion coefficient of water vapor (300K) were 4.1 and 4.0×10 －6 [m 2 / s].

[0147] In addition, in the same manner a...

Embodiment 3

[0150] Prepared respectively with the ratio of 40wt%, 30wt%, 30wt% graphite flakes (plane diameter (D): 15 μm, thickness (H): 0.1 μm, aspect ratio (D / H): 150, specific surface area: 6m 2 / g), Ketjen Black EC600JD (manufactured by LION, primary particle size: 34nm, specific surface area: 1270m 2 / g), PTFE ink (also contains surfactant, thickener). This ink was applied to a carbon paper (manufactured by Mitsubishi Rayon Co., Ltd., thickness: 160 μm) on which a fine porous layer (thickness: 45 μm) had been formed and water-repellent treated with 10 wt % PTFE. After coating, it was dried at 80°C for 30 minutes, and then baked at 330°C for 30 minutes to obtain an anode gas diffusion layer 3 (specification D) having a scaly graphite layer (anode fine porous layer) with a thickness of 90 μm. . At this time, the relative gas diffusion coefficient of the anode fine porous layer was 0.13 [−]. In addition, the tortuosity of the anode microporous layer and the effective diffusion coeff...

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Abstract

An electrolyte membrane-electrode assembly comprises a polymer electrolyte membrane; a cathode catalyst layer and a cathode gas diffusion layer including a cathode micro porous layer and a cathode gas diffusion layer substrate, arranged in order on one side of the polymer electrolyte membrane, and an anode catalyst layer and an anode gas diffusion layer including an anode micro porous layer and an anode gas diffusion layer substrate, arranged in order on the other side of the polymer electrolyte membrane. A relative gas diffusion coefficient of the anode micro porous layer is smaller than a relative gas diffusion coefficient of the cathode micro porous layer by an amount equal to or greater than 0.05[-].

Description

technical field [0001] The present invention relates to an electrolyte membrane-electrode assembly. In particular, the present invention relates to an electrolyte membrane-electrode assembly used in a solid polymer fuel cell (PEFC). Background technique [0002] In recent years, in response to social needs and trends in the background of energy and environmental issues, fuel cells have attracted attention as driving sources for vehicles and stationary power sources. Fuel cells are classified into various types according to the type of electrolyte, the type of electrodes, and the like. Representative fuel cells include alkali type, phosphoric acid type, molten carbonate type, solid electrolyte type, and solid polymer type. Among them, solid polymer fuel cells (PEFCs) that can operate at low temperatures (usually below 100°C) have attracted the most attention, and in recent years, development and practical use of them as low-pollution power sources for automobiles have progre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M4/86H01M4/96H01M8/10
CPCH01M8/10H01M8/1002H01M4/96H01M2008/1095H01M4/86H01M8/02H01M8/0202Y02E60/521H01M4/8605H01M2300/0082H01M8/04291H01M4/861H01M8/0234H01M8/0243H01M8/0245H01M8/04119H01M8/1004Y02E60/50
Inventor 桑田茂昌奥山阳三儿玉一史
Owner NISSAN MOTOR CO LTD