Composite membrane including ion-conductive polymer layer and gas blocking inorganic particles, method of preparing the composite membrane, and lithium air battery including the composite membrane

A composite membrane comprising:

• an ion-conductive polymer layer having a first surface and an opposite second surface;
• a plurality of gas blocking inorganic particles non-continuously aligned as a single monolayer in a substantially horizontal direction and disposed on the first or the second surface of the ion-conductive polymer layer, or a plurality of gas blocking inorganic particles as a single monolayer within the ion-conductive polymer, wherein the plurality of the non-continuously aligned particles disposed on the first or the second surface, and the plurality of particles within the ion-conductive polymer, do not extend from the first surface to the opposite second surface of the ion-conductive polymer layer;
• and
• wherein the composite membrane has a radius of curvature of about 10 millimeters or less.