Abstract: A button-type alkaline battery in which an anode 3 containing an anode active material and an alkaline electrolyte is disposed in a sealed space formed by sealing a cathode housing 4 with an anode sealing member 5, with a gasket 6 being interposed between the cathode housing 4 and the anode sealing member 5. The anode active material includes mercury-free zinc or a mercury-free zinc alloy. The button-type alkaline battery includes a metal layer 7 that is disposed between and in contact with the anode sealing member 5 and the anode 3. The metal layer 7 includes a base material containing zinc, and at least one metal M selected from the group consisting of indium, bismuth, and tin, with the metal M having segregated in the base material.

Abstract: An alkaline battery according to the present invention is provided with a positive electrode, a negative electrode, and an alkaline electrolyte solution. The negative electrode contains zinc alloy powder, a gelling agent, and an alkaline electrolyte solution. The zinc alloy powder is constituted by a zinc alloy containing 600 to 3000 ppm of aluminum. The zinc alloy powder contains particles with a particle size of 75 ?m or less, in a mass ratio of 10 to 40 mass % of all the particles. Furthermore, it is preferable that the negative electrode further contains an indium compound.

Abstract: A button-type alkaline battery in which an anode 3 containing an anode active material and an alkaline electrolyte is disposed in a sealed space formed by sealing a cathode housing 4 with an anode sealing member 5, with a gasket 6 being interposed between the cathode housing 4 and the anode sealing member 5. The anode active material includes mercury-free zinc or a mercury-free zinc alloy. The button-type alkaline battery includes a metal layer 7 that is disposed between and in contact with the anode sealing member 5 and the anode 3. The metal layer 7 includes a base material containing zinc, and at least one metal M selected from the group consisting of indium, bismuth, and tin, with the metal M having segregated in the base material.

Abstract: An alkaline battery is configured using a positive electrode for an alkaline battery containing a positive active material that contains nickel oxyhydroxide, wherein a surface of the nickel oxyhydroxide is covered with a cobalt compound, an electric potential of the nickel oxyhydroxide is in a range of 0.320 to 0.375 V with respect to a Hg/HgO reference electrode, and a content of the nickel oxyhydroxide is at least 35 wt % with respect to the positive active material. According to this configuration, an alkaline battery can be provided, which has excellent heavy-load discharging characteristics and storage characteristics at a high temperature, and has less degradation of characteristics. Furthermore, it is desirable to combine this positive electrode with a negative electrode containing minute zinc particles in at least a predetermined proportion.