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Separator for low temp. type fuel cell and method of production thereof

A fuel cell and separator technology, which is applied in the direction of fuel cells, fuel cell parts, battery pack parts, etc. It can solve the problems of poor acid resistance of organic membranes, increased contact resistance, peeling or dissolution, etc.

Inactive Publication Date: 2004-01-21
NISSHIN STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the organic film is used, the contact resistance of the metal material will increase, and since the organic film is poorly resistant to acidic conditions, it will be peeled off or dissolved from the surface of the metal material

Method used

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  • Separator for low temp. type fuel cell and method of production thereof
  • Separator for low temp. type fuel cell and method of production thereof
  • Separator for low temp. type fuel cell and method of production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] A stainless steel plate having the composition shown in Table 1 was used as the stainless steel substrate S. Carbon black with an average size of 0.05 μm and graphite particles with an average size of 3 μm were used as carbon particles.

[0074] steel

type

Components other than iron (weight%)

C

Si

mn

Ni

Cr

Mo

Cu

N

A

0.05

0.57

0.91

8.9

18.5

-

-

-

B

0.02

0.48

0.55

25.3

24.5

5.1

0.52

0.15

C

0.01

0.83

0.66

6.1

24.8

3.0

0.45

0.13

Steel A: Austenitic stainless steel

Steel B: Austenitic stainless steel

Steel C: Austenitic-ferrite duplex stainless steel

[0075] Coat carbon black or graphite particles to a bond rate of 5 mg / m by wiping a stainless steel plate with a felt impregnated with carbon black o...

Embodiment 2

[0087] In Example 2, the stainless steel plates shown in Table 1 were used as substrates. A nickel-chromium plating layer dispersed with carbon particles was formed on the surface of each stainless steel substrate by vapor deposition coating or electroplating described below.

[0088] Method 1: Form nickel-chromium coating by vapor deposition coating method

[0089] Graphite particles with an average size of 2 µm and carbon black with an average size of 0.03 µm were used as carbon particles. After activating the surface of the stainless steel plate in a vacuum chamber, the surface was wiped with a felt impregnated with carbon particles so that at 3 g / m 2 ~15g / m 2 The adhesion ratio applies carbon particles to the stainless steel surface. Subsequently, nickel and chromium were sputtered simultaneously in the same vacuum chamber at a deposition rate of 0.005 μm / sec.

[0090] The nickel-chromium plating layer PL formed in this way had a thickness of 0.5 µm and a chromium cont...

Embodiment 3

[0097] A stainless steel plate shown in Table 1 was used as a substrate, and a carbon particle-dispersed coating was formed on the stainless steel substrate by vacuum deposition.

[0098] Graphite particles with an average size of 2 µm and carbon black with an average size of 0.03 µm were used as carbon particles. After activating the surface of each stainless steel plate in a vacuum chamber, the surface was wiped with a felt impregnated with carbon particles so that at 5 g / m 2 ~15g / m 2 A binding ratio of carbon particles was applied to the surface of the stainless steel substrate. Subsequently, one or both of tantalum and titanium were sputtered simultaneously in the same vacuum chamber at a deposition rate of 0.004 μm / sec. The thickness of the plated layer PL formed in this way was 0.5 μm. like Figure 4A and Figure 4B As shown, graphite particles GP or carbon black aggregates CA are dispersed in each coating PL, respectively.

[0099] The contact resistance and acid ...

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Abstract

A separator for a low temperature type fuel cell using a stainless steel substrate S having carbon particles, such as graphite powder GP, and an aggregate CA of a carbon black, dispersed and press-bonded to the surface of the substrate in an island form, wherein the carbon particles are preferably bonded to the surface of the substrate S through a diffusion layer DL. The carbon particles such as the carbon aggregate CA and graphite powder GP may be dispersed in a plating layer, or a film component may be thermally decomposed after the carbon particles are dispersed in the film. A contact resistance is low because carbon powder having high conductivity is dispersed in the surface of the stainless steel substrate S having high oxidation resistance, and the occurrence of Joule heat which would otherwise result in a heat loss can be suppressed even when a large number of cells are stacked.

Description

Background of the invention [0001] The present invention relates to a fuel cell that can operate at relatively low temperatures, such as a metal separator for a solid macromolecule fuel cell and a production method thereof. [0002] Compared with other types of fuel cells, solid macromolecule fuel cells have the advantage of being able to operate at temperatures below 100°C and start working in a short time. Since the structure of this fuel cell is entirely made of solid components, it can be easily maintained in working condition and used in various situations where it is subject to vibration or shock. In addition, fuel cells can be designed to be smaller due to their high power density. Fuel cells also have very good combustion efficiency and low noise. In view of these advantages, fuel cells have been studied and attempted for mounting on engines of electric vehicles or the like. If a fuel cell were designed to travel long distances like a gasoline engine, a car equipped...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/02H01M50/409H01M50/449
CPCH01M8/021H01M8/0234H01M8/0204H01M8/0208Y02E60/50Y10T29/49115H01M2300/0082H01M8/0228Y02P70/50H01M8/02
Inventor 福居康松野雅典斋藤实
Owner NISSHIN STEEL CO LTD
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