Method for manufacturing membrane electrode assembly for hydrogen fuel cell using two types of binders, and membrane electrode assembly manufactured by the method
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorSukhwan Yun
Life of this patent
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Abstract
A method of manufacturing a membrane electrode assembly for hydrogen fuel cells includes mixing an electrode binder with a catalyst, followed by dispersing and thermal treatment, to prepare an electrode slurry, coating release paper with the electrode slurry to produce an electrode, and bonding the release paper-coated electrode to an electrolyte membrane, followed by thermal treatment, to perform electrode-membrane bonding.
Claims14
A method of manufacturing a membrane electrode assembly for hydrogen fuel cells comprising steps of:
- mixing an electrode binder comprising a first ionomer and a second ionomer with a catalyst,
- drying a resultant mixture
- performing a first thermal treatment to the resultant mixture to prepare an electrode slurry;
- coating the electrode slurry on release paper to produce electrodes;
- placing the electrode electrodes in contact with an electrolyte membrane;
- and
- performing a second thermal treatment to the electrode and the electrolyte membrane to bond them;
- wherein the first ionomer has a higher α-transition temperature than that of the second ionomer,
- the first thermal treatment is carried out at a temperature between the α-transition temperature of the first ionomer and the α-transition temperature of the second ionomer in presence of the first ionomer and the second ionomer for 30 minutes to 2 hours, and
- the second thermal treatment is carried out at a temperature not less than the α-transition temperature of the first ionomer.
A method of manufacturing a membrane electrode assembly for hydrogen fuel cells comprising steps of:
- mixing an electrode binder with a catalyst, followed by dispersing, drying and thermal treatment, to prepare an electrode slurry;
- coating the electrode slurry on release paper to produce electrodes;
- and
- placing the electrodes in contact with an electrolyte membrane, followed by thermal treatment, to bond the electrodes and the electrolyte membrane,
- wherein the electrode binder comprises a first ionomer and a second ionomer in an amount which is 20% to 40% of a total amount of the first and second ionomers with respect to a total weight of the electrode slurry,
- an α-transition temperature of the first ionomer is higher than an α-transition temperature of the second ionomer,
- the thermal treatment in the step of preparing an electrode slurry is carried out at a temperature between the α-transition temperature of the first ionomer and the α-transition temperature of the second ionomer for 30 minutes to 2 hours, and
- the thermal treatment in the step of bonding the electrodes and the electrolyte membrane is carried out at a temperature not less than the α-transition temperature of the first ionomer.
Dependencies are inferred from the claim text.