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Polyelectrolyte material, polyelectrolyte component, membrane electrode composite body, and polyelectrolyte type fuel cell

A polymer electrolyte, membrane electrode composite technology, applied in solid electrolyte fuel cells, fuel cells, fuel cell components and other directions, can solve the problems of expensive electrolyte, insufficient strength, insufficient proton conductivity, etc. The effect of excellent conductivity and excellent mechanical strength

Active Publication Date: 2007-10-03
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this membrane is used in a direct methanol fuel cell (hereinafter also referred to as DMFC), the proton conductivity is insufficient despite a long sulfonation time, and it is difficult to obtain a proton conductivity at a practical level of DMFC.
[0022] In these prior art, there are problems such as expensive electrolytes obtained, insufficient water resistance, insufficient strength, large fuel permeation, and poor oxidation resistance and free radical resistance.

Method used

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  • Polyelectrolyte material, polyelectrolyte component, membrane electrode composite body, and polyelectrolyte type fuel cell
  • Polyelectrolyte material, polyelectrolyte component, membrane electrode composite body, and polyelectrolyte type fuel cell
  • Polyelectrolyte material, polyelectrolyte component, membrane electrode composite body, and polyelectrolyte type fuel cell

Examples

Experimental program
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Effect test

Embodiment

[0303] Below, the present invention is described in more detail through examples, and these examples are used for better understanding of the present invention, but the present invention is not limited to these examples. In addition, it is stated here that the chemical structural formulas inserted in the examples of the present invention are inserted to help readers understand the present invention, and may not accurately express the arrangement of the polymeric components, sulfonic acid number of bases, molecular weight, etc.

[0304] [test methods]

[0305] (1) Density of sulfonic acid groups

[0306] The sample (about 0.2g) was immersed in a 30% methanol aqueous solution (more than 1000 times the sample amount by weight ratio) at 60°C for 12 hours while stirring, and then immersed in pure water (by weight ratio) at 20°C. 1,000 times the sample amount or more), while stirring, immersed for 24 hours, and then immersed in fresh pure water (1,000 times the sample amount in term...

Synthetic example 1

[0356] Synthesis of disodium 4,4'-difluorobenzophenone-3,3'-disulfonate (G1)

[0357]

[0358] Make 109.1g of 4,4'-difluorobenzophenone at 100°C in 150mL of fuming sulfuric acid (50% SO 3 ), reacted for 10 hours. Then, it was added little by little to a large amount of water, and after neutralizing with NaOH, 200 g of common salt was added to precipitate the composite. The obtained precipitate was separated by filtration and recrystallized from an aqueous ethanol solution to obtain disodium 4,4'-difluorobenzophenone-3,3'-disulfonate represented by the above formula (G1).

Synthetic example 2

[0360] The synthesis of polymer (sulfonic acid group density 1.7mmol / g) shown in formula (G2)

[0361]

[0362] (In the formula, * indicates that at this position, the right end of the above formula is combined with the left end of the following formula.)

[0363] Using 6.9 g of potassium carbonate, 14.1 g of 4,4'-(9H-fluorene-9-ylidene)bisphenol, 4.4 g of 4,4'-difluorobenzophenone and 8.4 g of the above Synthesis Example 1 The disodium 4,4'-difluorobenzophenone-3,3'-disulfonate obtained in , was polymerized in N-methylpyrrolidone (NMP) at 190°C. The polymer represented by the above formula (G2) was obtained by reprecipitating and refining with a large amount of water. The proton-substituted sulfonic acid group density of the obtained polymer was 1.7 mmol / g, and the weight average molecular weight was 220,000.

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Abstract

A polyelectrolyte material, a polyelectrolyte component, a membrane electrode composite body, and a polyelectrolyte type fuel cell. The above material is used in the above fuel cell or the like as the above component or the composite body. In addition to a conventional fuel cell using hydrogen gas as a fuel, a direct type fuel cell using methanol as a fuel is also attracting our attention. Although a material having performances excellent in proton conductivity and excellent in methanol shielding property and mechanical strength is required for the direct type fuel cell, the conventional material is short of satisfying the requirements. The above material is immersed in 1-30 wt.% methanol solution at 40-80 DEG C for 12 hours, and then is immersed in pure water at 20 DEG C for 24 hours to obtain a polyelectrolyte material having Rw, represented by the following expression, of 75-100 wt.% and an ionic radical in a water-containing state immediately after pulled up, whereby the above problems are solved. Rw= [Wnf / (Wfc+Wnf)]*100, in the expression, Wnf: non-frozen water amount per weight one gram of dry polyelectrolyte material Wfc: low-melting point water amount per weight one gram of dry polyelectrolyte material.

Description

technical field [0001] The present invention relates to a polymer electrolyte material, a polymer electrolyte member, a membrane electrode assembly, and a polymer electrolyte fuel cell that are excellent in proton conductivity, fuel barrier properties, and mechanical strength. Background technique [0002] Polymer electrolyte materials are used, for example, in medical material applications, filtration applications, concentration applications, ion exchange resin applications, various structural material applications, coating material applications, electrochemical applications, and the like. [0003] For electrochemical purposes, polymer electrolyte materials are used in fuel cells, redox flow batteries, water electrolysis devices, and chlor-alkali electrolysis devices in the form of polymer electrolyte components or membrane electrode complexes. [0004] Among them, a fuel cell is a power generation device with low emission, high energy efficiency, and a small burden on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01B1/06C08L101/12H01M8/10
CPCC08J5/2218H01B1/122H01M8/1011H01M8/1025H01M8/1027H01M8/1032H01M8/1067H01M8/1072H01M2300/0082Y02E60/523Y02E60/50Y02P70/50H01M8/10H01M8/02C08L101/12H01B1/06
Inventor 出原大辅足立真哉中村正孝
Owner TORAY IND INC