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SURFACE-MODIFIED NANOFIBERS, ELECTROLYTE MEMBRANE, METHOD FOR PRODUCING ELECTROLYTE MEMBRANE, MEMBRANE ELECTRODE ASSEMBLY AND SOLID POLYMER FUEL CELL 新技術説明会

外国特許コード F180009398
整理番号 (S2016-1066-N0)
掲載日 2018年4月20日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2017JP029772
国際公開番号 WO 2018038049
国際出願日 平成29年8月21日(2017.8.21)
国際公開日 平成30年3月1日(2018.3.1)
優先権データ
  • 特願2016-162455 (2016.8.23) JP
発明の名称 (英語) SURFACE-MODIFIED NANOFIBERS, ELECTROLYTE MEMBRANE, METHOD FOR PRODUCING ELECTROLYTE MEMBRANE, MEMBRANE ELECTRODE ASSEMBLY AND SOLID POLYMER FUEL CELL 新技術説明会
発明の概要(英語) [Problem] To develop novel nanofibers that constitute a composite electrolyte membrane and provide an electrolyte membrane which has sufficient ion conductivity (proton conductivity) and gas barrier properties even if formed into a thin membrane of 30 μm or less.
[Solution] Surface-modified nanofibers which are obtained by modifying the surfaces of polymer nanofibers with an acidic substance and a basic substance, and which are characterized in that the acidic substance has proton conductivity and the basic substance increases the modification amount of the acidic substance; an electrolyte membrane which contains these nanofibers; and a method for producing a composite membrane, which comprises a step for forming a nonwoven fabric formed of polymer nanofibers, a step for subjecting the nonwoven fabric to a surface modification treatment, a step for integrating the surface-modified nanofibers and a matrix polymer by filling the pores of the nonwoven fabric with the matrix polymer, and a step for subjecting an electrolyte membrane containing the surface-modified nanofibers to a post-treatment.
従来技術、競合技術の概要(英語) BACKGROUND ART
Various non-woven fabric is a composite film material can be introduced in various fields and applications, in recent years as an electrolyte membrane in polymer electrolyte fuel cell has attracted attention. The solid polymer fuel cell in the polymer electrolyte membrane as an electrolyte membrane has been proposed, Nafion (registered trademark) as an example of the fluorine-containing electrolyte is represented. However, these fluorine-based electrolyte membrane, the proton conductivity is lowered under a low humidification condition is for the power generation performance is poor, the transmission of the fuel gas by a side reaction caused by inducing the deterioration of the catalyst and membrane, the dimensional change caused by the poor film strength is inferior in long-term stability, the fluorine high cost for use, a problem that.
On the other hand, a fluorine material that does not use a hydrocarbon-based polymer electrolyte membrane has been studied for development. Hydrocarbon-based polymer electrolyte membrane, in order to increase the ion conductivity to increase the number of sulfonic acid groups has been proposed is, in this proposal, for the water-swellable film prone to be deformed, in addition, mechanical strength becomes weak, a film exhibiting excellent long-term stability in a problem that it is difficult to obtain.
Therefore, is variously developed and, in particular sulfonated polyimide, has high thermal stability and mechanical strength, excellent film-forming property, a high-performance as an electrolyte material has been proposed (JP-1-4). However, these proposed sulfonated polyimide, high temperature low humidity ion conductivity because it is a problem, a high ionic conductivity over a wide temperature range, excellent mechanical strength as a polymer electrolyte membrane, phosphoric acid-doped polybenzimidazole blend/sulfonated polyimide film (Patent Document 5) has been proposed. Such a film may be, a high temperature of approximately 120°C from a low temperature of about -20°C to the high ionic conductivity over a wide temperature range, the moisture in the film is small even under a low humidification of the ion conductivity is excellent. However, in recent years, the polymer electrolyte membrane, high ionic conductivity in unhumidified conditions is obtained, from the aim of decreasing the film resistance, the film thickness tends to be lowered. The blend film, having the main chain can be a rigid structure, but high mechanical strength, brittle and a thin film become difficult to handle the problem. In addition, the film thickness becomes thinner by increasing the permeability of gas, in order to generate a large amount of hydrogen peroxide, the oxidation stability is poor, a long-term stable film is not.
Therefore, in Patent Document 6, high ion conductivity in a wide temperature and humidity in the range, the handleability is excellent also in the thin film, composite film excellent in long-term stability, and a manufacturing method thereof are proposed.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • TOKYO METROPOLITAN UNIVERSITY
  • 発明者(英語)
  • KAWAKAMI Hiroyoshi
  • TANAKA Manabu
  • MAKINOUCHI Takahito
国際特許分類(IPC)
指定国 National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG

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