Fuel Cell Separating Plate And Method Of Manufacturing The Same

Abstract

Disclosed are a fuel cell separating plate having high temperature and acid resistance, and a method of manufacturing the same. The fuel cell separating plate includes a molded product manufactured from a mixture of expanded graphite and thermoplastic resin. The fuel cell separating plate and the method of manufacturing the same according to the present invention do not lower conductivity of the separating plate while decreasing a use amount of a conductive material. In addition, the fuel cell separating plate and the method of manufacturing the same simplify a manufacturing process and shorten manufacturing time.

Description

technical field

[0001] The invention relates to a fuel cell separation plate and a manufacturing method thereof. Specifically, it relates to a fuel cell separation plate with high temperature and acid resistance and a manufacturing method thereof. Background technique

[0002] A fuel cell refers to an assembled battery that electrochemically induces an oxidation reaction of fuel (hydrogen, phosphoric acid, methanol, etc.), so that the free energy change accompanying the oxidation reaction can be output in the form of direct electrical energy. Fuel cells can be divided into solid oxide fuel cells (SOFC, solid oxide fuel cells), phosphoric acid fuel cells (PAFC, phosphoric acid fuel cell), polymer electrolyte fuel cells (PEMFC, protonexchangemembrane fuel cell), direct methanol fuel cells ( DMFC, direct methanol fuel cell) and so on.

[0003] The separation plate that separates the electrolyte, fuel electrode, and air electrode in the stack components of the fuel cell requir...

Examples

experiment example 1

[0064] The molded body for the fuel cell separator was manufactured using the expanded graphite and FEP resin composition, and the electrical conductivity, flexural strength and gas tightness were tested according to the composition changes of the expanded graphite and the FEP resin. The results are shown in Table 1.

[0065] 【Table 1】

[0066]

[0067] As shown in Table 1, although the electrical conductivity increased and the flexural strength decreased as the FEP content decreased, it remained at a level usable as a corrosion-resistant fuel cell separator for high temperature use. In particular, even when the content of the FEP resin is around 10w%, the gas-tightness is maintained by virtue of the combined characteristics of the expanded graphite and the FEP resin.

[0068] In the carbon composites with the compositions shown in Table 1, even when the amount of expanded graphite was about 60 wt%, it was confirmed that they had electrical conductivity sufficient for use i...

experiment example 2

[0073] After fabricating the carbon composites for the production of porous separator plates, their electrical conductivity, flexural strength, and gas-tightness were measured. Table 2 is the result of an experimental example where the composition of expanded graphite and expanded graphite in FEP resin is manufactured at a ratio of 91-95%, and Table 3 is the result of an experimental example where the composition of natural graphite flakes is manufactured at a ratio of 85-92%.

[0074] 【Table 2】

[0075]

[0076]

[0077] 【table 3】

[0078]

[0079] It was confirmed that a fuel cell separator plate having a porosity of 0.1 to 10 cc / min or more can be manufactured by molding the above-mentioned carbon composite. Carbon composites produced as above can be used as figure 1 The high graphite containing layer of the fuel cell separator plate is shown.

technical field

[0001] The invention relates to a fuel cell separation plate and a manufacturing method thereof. Specifically, it relates to a fuel cell separation plate with high temperature and acid resistance and a manufacturing method thereof. Background technique

[0002] A fuel cell refers to an assembled battery that electrochemically induces an oxidation reaction of fuel (hydrogen, phosphoric acid, methanol, etc.), so that the free energy change accompanying the oxidation reaction can be output in the form of direct electrical energy. Fuel cells can be divided into solid oxide fuel cells (SOFC, solid oxide fuel cells), phosphoric acid fuel cells (PAFC, phosphoric acid fuel cell), polymer electrolyte fuel cells (PEMFC, protonexchangemembrane fuel cell), direct methanol fuel cells ( DMFC, direct methanol fuel cell) and so on.

[0003] The separation plate that separates the electrolyte, fuel electrode, and air electrode in the stack components of the fuel cell requir...

Examples

experiment example 1

[0064] The molded body for the fuel cell separator was manufactured using the expanded graphite and FEP resin composition, and the electrical conductivity, flexural strength and gas tightness were tested according to the composition changes of the expanded graphite and the FEP resin. The results are shown in Table 1.

[0065] 【Table 1】

[0066]

[0067] As shown in Table 1, although the electrical conductivity increased and the flexural strength decreased as the FEP content decreased, it remained at a level usable as a corrosion-resistant fuel cell separator for high temperature use. In particular, even when the content of the FEP resin is around 10w%, the gas-tightness is maintained by virtue of the combined characteristics of the expanded graphite and the FEP resin.

[0068] In the carbon composites with the compositions shown in Table 1, even when the amount of expanded graphite was about 60 wt%, it was confirmed that they had electrical conductivity sufficient for use i...

experiment example 2

[0073] After fabricating the carbon composites for the production of porous separator plates, their electrical conductivity, flexural strength, and gas-tightness were measured. Table 2 is the result of an experimental example where the composition of expanded graphite and expanded graphite in FEP resin is manufactured at a ratio of 91-95%, and Table 3 is the result of an experimental example where the composition of natural graphite flakes is manufactured at a ratio of 85-92%.

[0074] 【Table 2】

[0075]

[0076]

[0077] 【table 3】

[0078]

[0079] It was confirmed that a fuel cell separator plate having a porosity of 0.1 to 10 cc / min or more can be manufactured by molding the above-mentioned carbon composite. Carbon composites produced as above can be used as figure 1 The high graphite containing layer of the fuel cell separator plate is shown.

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