Patent ID: 8003247

Claim:
A method of manufacturing an alkaline button battery comprising: an anode containing an anode active material and an alkaline electrolyte disposed in a sealed space formed by sealing a cathode housing with an anode sealing member; and a gasket interposed between the cathode housing and the anode sealing member; the method comprising: producing the alkaline electrolyte; forming the anode by mixing the alkaline electrolyte and the anode active material; and while the anode and anode sealing member are disposed to be in contact with each other, forming a metal layer on a surface of the anode sealing member to be located on a side of the anode by leaving the anode and the anode sealing member to stand for a predetermined period of time so that the anode and anode sealing member are no longer in contact with each other, and thus the metal layer forms only between the anode sealing member and the anode, wherein the surface of the anode sealing member to be located on the side of the anode includes copper or a copper alloy, wherein in the alkaline electrolyte producing step, indium hydroxide is dissolved in an alkaline aqueous solution containing water and alkali metal hydroxide, and then the alkaline aqueous solution is diluted with water to provide the alkaline electrolyte that includes the alkali metal hydroxide with a concentration of 20 wt. % to 35 wt. % and an indium ion with a concentration of 69 ppm or more, wherein a content of the alkali metal hydroxide is 45 wt % or more of a total amount of the water and the alkali metal hydroxide before the dilution of the alkaline aqueous solution with water, wherein the anode active material that is mixed with the alkaline electrolyte in the anode forming step includes a mercury-free zinc indium alloy, and a content of indium in the zinc indium alloy is 100 ppm to 800 ppm, wherein the anode includes the indium ion derived from the indium hydroxide, wherein the metal layer includes a base material containing zinc that is derived from the zinc indium alloy, and the indium that is derived from the indium ion and segregated in the base material, and wherein a content of the indium is 0.1 wt. % or more of a total amount of zinc and the indium that are contained in the metal layer.