SOLID ELECTROLYTE MEMBRANE, METHOD AND APPARATUS FOR PRODUCING THE SAME, MEMBRANE ELECTRODE ASSEMBLY AND FUEL CELL
First Claim
1. A method for producing a solid electrolyte membrane comprising the steps of:
- a first process for casting a dope on a support from a casting die to form a casting membrane, said dope containing a solid electrolyte dissolved in an organic solvent;
a second process for performing a contact between said casting membrane and a contact poor solvent which is a poor solvent of said solid electrolyte, to give a self-supporting property to said casting membrane;
a third process for peeling said casting membrane having said self-supporting property from said support as a wet membrane; and
a fourth process for drying said wet membrane so that said wet membrane becomes said solid electrolyte membrane.
1 Assignment
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Accused Products
Abstract
In a casting membrane forming process (63), a dope containing a solid electrolyte is cast on a casting belt (93) from a casting die. On the casting belt, a casting membrane (61) is formed. In a casting membrane drying process (66a), the casting membrane (61) is dried. In a solvent contacting process (66b), the casting membrane (61) contacts a poor solvent of the solid electrolyte. By a self-supporting property developing process (66), a self-supporting property is given to the casting membrane (61) for a short time. The casting membrane (61) is peeled from the casting belt (93) as a precursor membrane (67). The precursor membrane (67) is immersed into water. After the precursor membrane (67) is dried, a proton substitution is performed to obtain a hydrogen-substituted membrane (75). By washing and drying of the hydrogen-substituted membrane (75), a solid electrolyte membrane (79) is obtained.
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Citations
20 Claims
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1. A method for producing a solid electrolyte membrane comprising the steps of:
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a first process for casting a dope on a support from a casting die to form a casting membrane, said dope containing a solid electrolyte dissolved in an organic solvent; a second process for performing a contact between said casting membrane and a contact poor solvent which is a poor solvent of said solid electrolyte, to give a self-supporting property to said casting membrane; a third process for peeling said casting membrane having said self-supporting property from said support as a wet membrane; and a fourth process for drying said wet membrane so that said wet membrane becomes said solid electrolyte membrane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 18, 19, 20)
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16. An apparatus for producing a solid electrolyte membrane comprising:
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a casting membrane forming device for casting a dope on a support from a casting die to form a casting membrane, said dope containing a solid electrolyte dissolved in an organic solvent; a solvent contacting device for performing a contact between said casting membrane and a contact poor solvent which is a poor solvent of said solid electrolyte, to give a self-supporting property to said casting membrane; a peeling device for peeling said casting membrane having said self-supporting property from said support as a wet membrane; a liquid contacting device for performing a contact between said wet membrane and a liquid which is compatible with said organic solvent; and a drying device for drying said wet membrane so that said wet membrane becomes said solid electrolyte membrane. - View Dependent Claims (17)
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Specification