Patent ID: 7820314
Filing Date: 2010-10-26
Classification: H01M,Y02E,Y02P

Abstract:
1. A proton-conducting polymer membrane based on polyazoles, obtained by a process comprising the steps of: A) mixing one or more aromatic tetraamino compounds having a high phosphoric acid affinity or low phosphoric acid affinity with B) heating the mixture from step A), and polymerizing until an intrinsic viscosity of up to 1.5 dl/g is obtained to form a polymer whose phosphoric acid affinity is greater than the phosphoric acid affinity of the polymer formed in step D); C) mixing one or more aromatic tetraamino compounds having a high phosphoric acid affinity or low phosphoric acid affinity D) heating the mixture from step C), and polymerizing until an intrinsic viscosity of up to 1.5 dl/g is obtained to form a polymer whose phosphoric acid affinity is less than the phosphoric acid affinity of the polymer formed in step B); E) combining the polymer from step B) and the polymer from step D), the phosphoric acid affinity of the polymer from step B) being greater than the phosphoric acid affinity of the polymer from step D); F) forming a layer by applying the mixture obtained in step E) on a carrier or on an electrode, G) heating the layer obtained according to step F), until an intrinsic viscosity of more than 1.5 dl/g is attained to form a polyazole block copolymer membrane; and H) partially hydrolyzing the polyphosphoric acid in the membrane formed in step G) until it is self-supporting, thereby forming the proton-conducting membrane.