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US 7,597,981 B2Granted
Composite electrolyte membrane with nanoscopic dendrimers and method of preparing same
AssigneeHyundai Motor Company
InventorsJong Hyun Lee, Hwan Soo Shin, Hee Woo Rhee, Young Taek Kim, Min Kyu Song, Min Sung Kim
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Abstract
The present invention relates to a composite electrolyte membrane for fuel cells that has high proton conductivity and low fuel permeability even under low humidity conditions and at elevated temperatures. The membrane, comprising a cation exchange resin and acid-treated dendrimers, has great utility in large and medium fuel cells for applications in household appliances, electric vehicles, etc.
Claims6
A composite electrolyte membrane comprising:
- a) a cation exchange resin, wherein the cation exchange material is a compound containing at least one of the group consisting of sulfonic acid group, carboxylic acid group, phosphoric acid group, phosphonyl acid group, or derivatives thereof;
- b) an acid-treated dendrimer, wherein the dendrimer is selected from one of the group consisting of poly(amido-amine)(PAMAM) dendrimer, carboxylin dendrimer, polyphenylene dendrimer, or phosphorus-containing dendrimer.
A method of fabricating a composite electrolyte membrane, comprising the steps of:
- (a) dissolving a cation exchange material in an organic solvent to prepare a polymer solution;
- (b) adding an acid-treated dendrimer to the polymer solution;
- and
- (c) mixing the polymer solution and the dendrimer by ultrasonic means to fabricate the composite electrolyte membrane.
1 more element
Dependencies are inferred from the claim text.