Toray Industries, Inc.

Ford Motor Company Limited

Daimler Ag

Yuka Fujieda

Daisuke Izuhara

Hiroaki Umeda

Naoki Shimoyama

Yunsong Yang

Tomoyuki Kunita

Jing Li

Keping Wang

Yuta Shintaku

Shinya Adachi

An excellent polymer electrolyte composition has excellent chemical stability of being resistant to strong oxidizing atmosphere during operation of fuel cell, and achieves excellent proton conductivity under low-humidification conditions, excellent mechanical strength and physical durability. A polymer electrolyte membrane, a membrane electrode assembly, and a polymer electrolyte fuel cell each use the same. The polymer electrolyte composition contains an ionic group-containing polymer (A), a phosphorus-containing additive (B), and a nitrogen-containing aromatic additive (C), the phosphorus-containing additive (B) and the nitrogen-containing aromatic additive (C) being a compound represented by specific structural formulae.

Polymer electrolyte composition and polymer electrolyte membrane, polymer electrolyte membrane with catalyst layer, membrane electrode assembly, and polymer electrolyte fuel cell each using the same

The present invention provides: a polymer electrolyte composition which can achieve excellent proton conductivity under slightly humidified conditions, excellent mechanical strength and excellent physical durability, has excellent practicality, and can be produced using a nitrogen-containing additive, wherein the nitrogen-containing additive can prevent the elution of the additive under a strongly acidic atmosphere during the operation of a fuel cell, has excellent chemical stability so as to tolerate a strongly acidic atmosphere, can be dissolved in various general-purpose organic solvents, has superior processability, can be mixed with an ionic-group-containing polymer, can prevent the occurrence of phase separation during the formation of a film, and can prevent the formation of an island-in-sea-like phase separation structure or the occurrence of bleeding out during the formation of a film; and a polymer electrolyte membrane, a membrane electrode assembly and a polymer electrolyte fuel cell, each of which is produced using the polymer electrolyte composition. The polymer electrolyte composition according to the present invention comprises at least an ionic-group-containing polymer (A) and a nitrogen-containing additive (B), said polymer electrolyte composition being characterized in that the nitrogen-containing additive (B) is represented by a specific structural formula.

Polymer electrolyte composition, and polymer electrolyte membrane, membrane electrode complex and solid polymer-type fuel cell each produced using same

Growing community of inventors

Otsu, Japan

Yuka Fujieda