Oxygen permeable membrane for air secondary battery, armouring material for air secondary battery and secondary battery
Provided is an oxygen permeable membrane for use in an air secondary battery, which excels in oxygen permeability, barrier performance to water, being capable of preventing electrolyte from leaking out. Such an oxygen permeable membrane includes a thermoplastic resin membrane and inorganic particles having pores having pore diameter of 10 Å or less contained in the thermoplastic resin membrane, in which the thermoplastic resin membrane has one surface on which hydrophobic treatment is effected.
1. An armouring material for use in an air secondary battery, comprising
an armouring sheet constituted by laminating an outer layer including heat-resistant resin film, a metal foil layer, and an inner layer including a thermoplastic resin film, being equipped with an opening part for taking oxygen in, perforating through the outer layer, the metal foil layer and the inner layer, and
an oxygen-permeable membrane being joined to an inner layer side in an opening part periphery so as to cover the opening part,
wherein the oxygen-permeable membrane is constituted from a thermoplastic resin membrane and inorganic particles having pores having pore diameter of 10 Å or less contained in the thermoplastic resin membrane, wherein the thermoplastic resin membrane has one surface on which hydrophobic treatment was effected, and
the one surface of the thermoplastic resin membrane on which hydrophobic treatment was effected is directed to the armouring sheet side.
2. The armouring material for use in an air secondary battery as set forth in claim 1 , wherein the inorganic porous particles are made of one or more selected from the group consisting of zeolite, anodic oxidation alumina, porous alumina, porous titania, porous zirconia, porous carbon, and porous silica.
3. The armouring material for use in an air secondary battery as set forth in claim 1 , wherein the thermoplastic membrane is made of polyethylene, polypropylene, polystyrene resin or polyurethane resin.
4. The armouring material for use in an air secondary battery as set forth in claim 1 , wherein the hydrophobic treatment is applying of silane treatment agent having hydrophobic functional groups.
5. The armouring material for use in an air secondary battery as set forth in claim 1 , wherein a joining surface of an outer periphery of the oxygen-permeable membrane and/or an opening part periphery is applied with silane coupling agent having a reactive functional group.
6. The armouring material for use in an air secondary battery as set forth in claim 5 , wherein the reactive functional group has any one selected from the group consisting of a vinyl group, an epoxy group, a styryl group, a methacryl group, an acryl group, an amino group, an ureido group, a mercapto group, a sulfide group, and an isocyanate group, at the end thereof.
7. The armouring material for use in an air secondary battery as set forth in claim 1 , wherein each of the armouring sheet and the oxygen-permeable membrane is contact bonded or adhered with each other.
8. An air secondary battery comprising the oxygen-permeable membrane for use in an air secondary battery as set forth in claim 1 .
9. An air secondary battery comprising the armoring material for use in an air secondary battery as set forth in claim 1 .