| 摘要 |
PROBLEM TO BE SOLVED: To suppress the increase of internal resistance even when a preservation period is prolonged by applying a catalyst layer reducing oxygen over a current collector made of a metal material, and specifying the center line average roughness of the surface of the current collector. SOLUTION: When the surface roughness Ra of the current collector 2 of an air cell 1 is set to 10-100 μm, the current collector 2 bites into a catalyst layer 3, and the contact between the current collector 2 and the catalyst layer 3 can be made firm. The current collector 2 is made of a material having conductivity has holes on the surface and back face of a flat plate-like metal wire mesh or an expand metal. A material having strong mechanical strength and excellent corrosion resistance is desirous for the material of the current collector 2. Fe-Ni-Cr stainless steel is used for the material. Plating is applied to the surface of the current collector 2, and nickel or tin is used for the material. The mechanical strength and electric conductivity of the current collector 2 can be reconciled. |
