Ion conducting membrane having high hardness and dimensional...

H - Electricity – 01 – M

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H01M 2/16 (2006.01) C08J 5/22 (2006.01) C08L 27/18 (2006.01) H01M 8/10 (2006.01) C25B 9/10 (2006.01) C25B 13/08 (2006.01)

Patent

CA 2459984

An integral composite membrane comprised of an expanded polytetrafluoroethylene having a morphological structure comprising a microstructure of very highly elongated nodes interconnected by fibrils is imbibed with ionomer. This composite membrane shows a surprising increase in hardness and thereby reduces electrical shorting and improves fuel cell performance and durability.

L'invention porte sur une membrane composite intégrale qui comprend un polytétrafluoroéthylène expansé dont la structure morphologique comprend une microstructure à noeuds extrêmement allongés interconnectés par des fibrilles, cette membrane étant imbibée d'un ionomère. Il s'avère que la dureté de la membrane composite s'accroît de façon étonnante, ce qui réduit le court-circuit électrique et améliore la performance et la durabilité de la pile à combustible.

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