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Electrolyte material, liquid composition, and membrane electrode assembly for solid polymer fuel cells

A technology of electrolyte materials and compounds, applied in the direction of solid electrolyte fuel cells, fuel cells, fuel cell components, etc., can solve the problems of easy decline in power generation characteristics, large size changes, and easy flooding, etc., and achieve excellent power generation characteristics Effect

Inactive Publication Date: 2015-12-09
AGC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A membrane-electrode assembly having a catalyst layer containing the polymer of (1) has excellent power generation characteristics, but since the polymer of (1) has a high water content, flooding is likely to occur under high humidification conditions, and the power generation characteristics are likely to deteriorate
[0005] In addition, since the solid polymer electrolyte membrane containing the polymer of (1) has a high water content, the dimensional change when swollen is large compared with the size of the dry state.
Therefore, in the case of repeated swelling and drying, the solid polymer electrolyte membrane may be broken

Method used

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  • Electrolyte material, liquid composition, and membrane electrode assembly for solid polymer fuel cells
  • Electrolyte material, liquid composition, and membrane electrode assembly for solid polymer fuel cells
  • Electrolyte material, liquid composition, and membrane electrode assembly for solid polymer fuel cells

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Experimental program
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preparation example Construction

[0183] The preparation method of the liquid composition may, for example, be a method of shearing the electrolyte material in the dispersion medium under atmospheric pressure or in a sealed state with an autoclave or the like. The preparation temperature is preferably 0 to 250°C, more preferably 20 to 150°C. If necessary, shearing such as ultrasonic waves can be applied.

[0184] The liquid composition of the present invention is suitable for forming a catalyst layer in a membrane electrode assembly described later.

[0185]

[0186] figure 1 It is a cross-sectional view showing an example of the membrane electrode assembly of the present invention. The membrane electrode assembly 10 includes an anode 13 having a catalyst layer 11 and a gas diffusion layer 12, a cathode 14 having a catalyst layer 11 and a gas diffusion layer 12, and is disposed between the anode 13 and the cathode 14 in a state of being in contact with the catalyst layer 11. Electrolyte membrane 15.

[0...

Embodiment

[0230] The following examples are given to illustrate the present invention in detail, but the present invention is not limited to these examples. Examples 1-4 are examples, and Examples 5-9 are comparative examples.

[0231] (composition of unit)

[0232] The ratio of each unit constituting the polymer (F) is determined by using 19 Compositional analysis by F-NMR was obtained.

[0233] (ion exchange capacity)

[0234] The ion exchange capacity of the polymer (H) was calculated from the ratio of each unit constituting the polymer (F).

[0235] (TQ)

[0236] TQ (unit: °C) is an indicator of the molecular weight and softening temperature of the polymer (F), and the polymer (F) is melt-extruded under the extrusion pressure of 2.94 MPa using a nozzle with a length of 1 mm and an inner diameter of 1 mm. When the extrusion volume reaches 100mm 3 / sec temperature.

[0237] Using a flow tester CFT-500D (manufactured by Shimadzu Corporation (Shimadzu Corporation)), the temperatu...

example 1

[0266] 22.47 g of compound (mb2-1), 5.10 g of compound (ma1-1), 21.10 g of compound (s-1) as a solvent, and a compound as a radical polymerization initiator were charged into a stainless steel autoclave with an inner volume of 125 mL. (i-1) 14.7 mg was fully degassed under cooling with liquid nitrogen. After the temperature was raised to 40° C., TFE was introduced, and the pressure was set at 0.40 MPaG, and the supply was continuously performed while maintaining a constant temperature and pressure. When 0.16 g of TFE was supplied, a mixture of 0.96 g of compound (mb2-1) and 1.0 g of compound (ma1-1) was supplied from a supply line cooled with dry ice. Moreover, when supplying this mixture, the supply line was cleaned using 0.5 g of compound (s-1). The supply of this mixture was performed 12 times in total. The feeding interval of this mixture is about 30 minutes. Since the supply amount of TFE reached the prescribed amount, the autoclave was cooled after 6.5 hours to termin...

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Abstract

Provided are: an electrolyte material which is capable of providing a membrane electrode assembly that is not susceptible to flooding in a catalyst layer of the membrane electrode assembly and breakage of a solid polymer electrolyte membrane and has excellent power generation characteristics; and a method which enables the production of an electrolyte material that has suppressed low moisture content even though the electrolyte material is formed of a polymer that has a unit derived from a perfluoromonomer having a dioxolane ring. An electrolyte material which is formed of a polymer (H) that is obtained by exchanging -SO2F groups in a polymer (F) with ion exchange groups, said polymer (F) having a unit derived from a perfluoromonomer having an -SO2F group and a dioxolane ring, a unit derived from a perfluoromonomer having a dioxolane ring but not having an -SO2F group, and a unit derived from tetrafluoroethylene. This electrolyte material has an ion exchange capacity of 0.9-1.3 meq / g-dry resin and a moisture content of 20-100%.

Description

technical field [0001] The present invention relates to an electrolyte material, a liquid composition containing the electrolyte material, and a membrane electrode assembly for a polymer electrolyte fuel cell including the electrolyte material in at least one of a catalyst layer and a solid polymer electrolyte membrane. Background technique [0002] The following polymers have been proposed as electrolyte materials contained in the catalyst layer of a membrane electrode assembly for a solid polymer fuel cell (hereinafter also simply referred to as a membrane electrode assembly). [0003] (1) will include the source with -SO 2 F group and units of perfluoromonomers of dioxolane, and derived from -SO 2 —SO 2 The F group is converted into an ion exchange group (-SO 3 - h + base, etc.) polymer (Patent Document 1). [0004] A membrane electrode assembly having a catalyst layer containing the polymer of (1) has excellent power generation characteristics, but since the polyme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02C08F214/26C08F224/00C08F234/02H01B1/06H01B13/00H01M8/10
CPCC08F214/26C08F214/18C08F234/02H01B1/122H01M8/02H01M8/10H01M8/1004H01M8/1023H01M8/1039H01M8/1072H01M2300/0082Y02P70/50Y02E60/50
Inventor 斋藤贡木村了下平哲司
Owner AGC INC
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