Molded article of polymer electrolyte composition and solid polymer type fuel cell using same

A polymer electrolyte and molded body technology, applied in the direction of solid electrolyte fuel cells, fuel cells, fuel cell parts, etc., can solve the problems of long-term durability deterioration, proton conductivity increase, membrane rupture, etc., and achieve excellent physical Excellent effect of durability, high output, mechanical strength and chemical stability

Active Publication Date: 2014-05-21
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, in the segment where the sulfonic acid group is introduced, since hydrogen peroxide converges and diffuses into the segment where the sulfonic acid group is introduced together with water, the cutting of the polymer chain, the decomposition of the sulfonic acid group, and the formation of oligomers The elution proceeds more violently, and as a result, the resistance increases due to the decrease in proton conductivity, the formation of pinholes, and the rupture of the film become more likely to occur, and as a result, the long-term durability deteriorates

Method used

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  • Molded article of polymer electrolyte composition and solid polymer type fuel cell using same
  • Molded article of polymer electrolyte composition and solid polymer type fuel cell using same
  • Molded article of polymer electrolyte composition and solid polymer type fuel cell using same

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Embodiment

[0257] The present invention will be described more specifically through examples below, but the present invention is not limited thereto. In addition, the measurement conditions of each physical property are as follows. In addition, although the chemical structural formula is inserted in this Example, this chemical structural formula is inserted for the convenience of a reader's understanding, and is not limited to them.

[0258] (1) Ion exchange capacity

[0259] It measures by the neutralization titration method described in following (1)-(4). Measured 3 times, take their average value.

[0260] (1) After wiping off the moisture on the surface of the electrolyte membrane that had been proton-substituted and sufficiently washed with pure water, it was vacuum-dried at 100° C. for 12 hours or more, and the dry weight was determined.

[0261] (2) 50 mL of a 5% by weight sodium sulfate aqueous solution was added to the electrolyte, and the solution was left to stand for 12 ho...

Synthetic example 1

[0359] Synthesis of 2,2-bis(4-hydroxyphenyl)-1,3-dioxolane (K-DHBP) represented by the following general formula (G1)

[0360]

[0361] 49.5 g of 4,4'-dihydroxybenzophenone, 134 g of ethylene glycol, 96.9 g of trimethyl orthoformate, and 0.50 g of p-toluenesulfonic acid monohydrate were added to a 500 mL flask equipped with a stirrer, a thermometer, and a distillation tube , to dissolve them. Then keep stirring at 78-82° C. for 2 hours. Furthermore, the temperature was gradually raised to an internal temperature of 120° C., and the distillation of methyl formate, methanol, and trimethyl orthoformate was completely stopped. The reaction liquid was cooled to room temperature, and then the reaction liquid was diluted with ethyl acetate, and the organic layer was washed with 100 mL of 5% potassium carbonate aqueous solution, and after liquid separation, the solvent was distilled off. 80 mL of dichloromethane was added to the residue to precipitate crystals, which were filtere...

Synthetic example 2

[0363] Synthesis of 3,3'-sodium disulfonate-4,4'-difluorobenzophenone represented by the following general formula (G2)

[0364]

[0365] 109.1 g of 4,4'-difluorobenzophenone (Aldrich reagent) was added to fuming sulfuric acid (50% SO 3 ) in 150 mL (Wako Pure Chemical Chemicals), react at 100°C for 10 hours. Then, it was poured into a large amount of water little by little, neutralized with NaOH, and then 200 g of common salt was added to precipitate the composite. The obtained precipitate was filtered and recrystallized from ethanol aqueous solution to obtain 3,3'-sodium disulfonate-4,4'-difluorobenzophenone represented by the general formula (G2). The purity is 99.3%. structure 1 H-NMR confirmed. Impurities were quantitatively analyzed by capillary electrophoresis (organic) and ion chromatography (inorganic).

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Abstract

Provided are a molded article of a polymer electrolyte composition, which has an excellent proton conductivity even under low humidity and low temperature conditions, yet shows a high chemical stability, a good mechanical strength and a good fuel shutoff ability, and, when used in a solid polymer type fuel cell, can achieve a high output, a high energy density and a long-term durability, and a solid polymer type fuel cell using the same. The molded article of the polymer electrolyte composition, which comprises a block copolymer having one or more ionic group-containing hydrophilic segments (A1) and one or more ionic group-free hydrophobic segments (A2) together with an additive, is characterized in that the molded article forms a co-continuous or lamellar phase separation structure and the additive has a hydrophilic nature.

Description

technical field [0001] The present invention relates to a highly practical polymer electrolyte combination that has excellent proton conductivity even under low-humidification conditions and low-temperature conditions, and can achieve excellent chemical stability, mechanical strength, fuel blocking properties, and long-term durability Object moldings and solid polymer fuel cells. Background technique [0002] A fuel cell is a power generation device that generates electric energy by electrochemically oxidizing fuel such as hydrogen or methanol. In recent years, it has attracted attention as a clean energy supply source. Among them, solid polymer fuel cells have a low standard operating temperature of about 100°C and high energy density, so they are expected to be widely used as relatively small distributed power generation facilities, mobile power generation devices such as automobiles, and ships. . In addition, it is also attracting attention as a power source for small m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/06C08G81/00C08J5/22C08L71/08C08L81/02H01M8/02H01M8/10
CPCH01B1/122H01M8/1025H01M8/1051H01M2008/1095H01M2300/0082C08J5/2256C08J2371/12C08J2481/02H01M8/1048Y02P20/582C08G65/4025C08G65/4043C08G65/4056Y02P70/50Y02E60/50H01M8/1032H01M8/1039
Inventor 国田友之出原大辅矢地佑佳
Owner TORAY IND INC
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