Metal-air battery having folded structure and method of manufacturing the same

1. A metal-air battery comprising:

a negative electrode metal layer;

a negative electrode electrolyte layer disposed on the negative electrode metal layer;

a gas diffusion layer including a first surface and a second surface opposite to the first surface;

a first positive electrode layer disposed between a first portion of the negative electrode electrolyte layer and the first surface of the gas diffusion layer, the first positive electrode layer comprising a positive electrode material which is capable of using oxygen as an active material; and

a second positive electrode layer disposed between a second portion of the negative electrode electrolyte layer and the second surface of the gas diffusion layer,

wherein the first portion of the negative electrode electrolyte layer is between the first positive electrode layer and a first portion of the negative electrode metal layer, and a second portion of the negative electrode electrolyte layer is between the second positive electrode layer and a second portion of the negative electrode layer,

wherein the negative electrode metal layer and the negative electrode electrolyte layer are bent so that the negative electrode metal layer and the negative electrode electrolyte layer are in a folded configuration so that the first portion of the negative electrode electrolyte layer contacts a lower surface of the first positive electrode layer and the second portion of the negative electrode electrolyte layer contacts an upper surface of the second positive electrode layer, and

wherein one side surface of the gas diffusion layer is exposed to the outside and the negative electrode electrolyte layer.

2. The metal-air battery of claim 1 , wherein the first and second positive electrode layers are disposed on a lower surface and an opposite upper surface of the gas diffusion layer.

3. The metal-air battery of claim 2 , wherein the gas diffusion layer comprises a plurality of gas diffusion layers,

wherein first and second positive electrode layers are disposed on lower and upper surfaces of each gas diffusion layer of the plurality of gas diffusion layers, respectively, and

wherein the negative electrode metal layer and the negative electrode electrolyte layer are repeatedly bent so that the negative electrode electrolyte layer contacts the first positive electrode layer and the second positive electrode layer.

4. The metal-air battery of claim 3 , wherein, between two adjacent gas diffusion layers, the negative electrode metal layer and the negative electrode electrolyte layer are bent by 180 degrees so that the negative electrode metal layer is folded configuration and the negative electrode electrolyte layer contacts the first positive electrode layer and the second positive electrode layer.

5. The metal-air battery of claim 3 , wherein same side surfaces of each gas diffusion layer of the plurality of gas diffusion layers are exposed to the outside.

6. The metal-air battery of claim 1 , further comprising a negative electrode collector which contacts a bend portion of the negative electrode metal layer and extends in a direction perpendicular to a major surface of each of the negative electrode metal layer, the negative electrode electrolyte layer, the first positive electrode layer, and the gas diffusion layer.

7. The metal-air battery of claim 1 , wherein an end of the exposed side surface of the gas diffusion layer protrudes from the negative electrode metal layer, the negative electrode electrolyte layer, and the first and second positive electrode layers.

8. The metal-air battery of claim 1 , wherein the negative electrode electrolyte layer comprises a separation layer which is ionically conductive and substantially impermeable to oxygen, and an electrolyte.