Zinc-alkaline battery

Abstract

A zinc-alkaline battery includes a negative electrode, a positive electrode, a separator, and an electrolyte. The negative electrode contains a zinc alloy powder including 20 to 50 wt % of a micropowder with a particle size of 75 μm or less. In a constant resistance discharge, a time period for the negative electrode potential to rise is shorter than a time period for the positive electrode potential to fall.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view of an alkaline dry cell battery in Example of the present invention, with a partially cutaway view showing its cross section.

FIG. 2 is a graph showing discharge curves of a positive electrode and a negative electrode of batteries (1) and (7) at a continuous discharge with 10Ω.

FIG. 3 is a graph showing discharge curves of a positive electrode and a negative electrode of batteries (7) and (8) at a continuous discharge with 10Ω.

Claims

1. A zinc-alkaline battery comprising a negative electrode, a positive electrode, a separator interposed between said negative electrode and said positive electrode, and an electrolyte, wherein said negative electrode contains a zinc alloy powder including 20 to 50 wt % of a micropowder with a particle size of 75 μm or less, anda time period for a negative electrode potential to rise is shorter than a time period for a positive electrode potential to fall in a constant resistance discharge.

2. The zinc-alkaline battery in accordance with claim 1, wherein said negative electrode contains 0.02 to 0.1 part by weight of an additive of at least one selected from the group consisting of a sulfide of alkali metal and indium sulfide per 100 parts by weight of said zinc alloy powder.

3. The zinc-alkaline battery in accordance with claim 1, wherein said zinc alloy powder contains 0.005 to 0.1 wt % of at least one selected from the group consisting of bismuth and indium, and 0.001 to 0.05 wt % of at least one selected from the group consisting of aluminum and calcium.

4. A zinc-alkaline battery comprising a negative electrode, a positive electrode, a separator interposed between said negative electrode and said positive electrode, and an electrolyte, wherein said negative electrode contains a zinc alloy powder including 20 to 50 wt % of a micropowder with a particle size of 75 μm or less, anda negative electrode potential rises before a fall of a positive electrode potential in an ending period of a constant resistance discharge to regulate said battery with a negative electrode capacity.

5. The zinc-alkaline battery in accordance with claim 4, wherein said negative electrode contains 0.02 to 0.1 wt % of at least one additive selected from the group consisting of a sulfide of alkali metal and indium sulfide per 100 parts by weight of said zinc alloy powder.

6. The zinc-alkaline battery in accordance with claim 4, wherein said zinc alloy powder contains 0.005 to 0.1 wt % of at least one selected from the group consisting of bismuth and indium, and 0.001 to 0.05 wt % of at least one selected from the group consisting of aluminum and calcium.