JPS58188056A - Alkaline silver-oxide battery - Google Patents

Abstract

PURPOSE:To improve the capacity and the low-temperature characteristic of an alkaline silver-oxide battery by using two kinds of amalgamated zinc powders with different grain sizes, and adjusting the proportional amount and the mercury concentration of each kind of amalgamated zinc powder to within specified ranges. CONSTITUTION:In a battery which is constituted by using a positive mixture 1, a negative active material 2a consisting of an amalgamated zinc powder of 60-100 meshes and a negative active material 2b consisting of an amalgamated zinc powder of 200- 250 meshes, after the powder of 60-100 meshes is weighed with the conventional weighing accuracy, the powder of 200-250 meshes is weighed so as to realize a high weighing accuracy of + or -0.3mg. When the proportional amounts of the amalgamated zinc powders 2a and 2b are adjusted to 60-70% and 40-30% and the mercury concentrations of the amalgamated zinc powders 2a and 2b are adjusted to 7-9% and 19-21% respectively, the amounts of the positive active material and the negative active materials 2a and 2b which are necessary in constituting the battery can be saved, respectively, by 9%, 3% and 3% as compared to the conventional battery with the same nominal capacity as the above battery, and a 12% improvement of capacity can be achieved for the same internal volume.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a negative electrode active material for an alkaline silver oxide battery.

Conventionally, when silver oxide is used as a positive electrode active material and zinc hydrate is used as a negative electrode active material, it has been devised so that the rate of discharge is always determined by the negative electrode even after long-term storage. FIG. 1 is a longitudinal sectional view of a conventional battery. 1 is a positive electrode active material, 2 is a negative electrode active material, and their weight composition is as follows:
The amount of positive electrode active material was 1.2 to 13, which is largely due to the difference in self-deterioration rate due to long-term aging of the positive electrode and negative electrode side active materials, and the variation in weighing accuracy during δ assembly.

ing.

The present invention aims to eliminate the above-mentioned drawbacks and improve capacity. Another purpose is to improve low temperature characteristics.

FIG. 2 is a sectional view showing an embodiment of the present invention.

1 is a positive electrode mixture, 2a is a negative electrode active material made of frozen zinc with a particle size of 60 to 100 mesons, and 2b is a negative electrode active material with a particle size of 60 to 100 mesons.
It is a negative electrode active material consisting of ~250 mesh zinc hydrate. Conventionally, the accuracy of weighing the negative electrode active material was as high as ±2.0 m g, and when converted into a capacitance value, the width was 3 m A II, which was a significant disadvantage. In the product of this invention, 60 to 1
00 mesh products are weighed using the conventional weighing capacity, and 20 (1 to
250 mesh products allow matching (20
Weighing accuracy of 0 to 250 meters (±0.1 m g),
A high weighing accuracy of ±0.3 m g was obtained. In addition, in the negative electrode active material in this example, the particle size of zinc hydrate is 60~
The 100-mesh product accounts for 60% to 70% by weight, the mercury concentration is 7% to 9%, and the particle size of zinc hydride is 200% to 70%.
The 250-mesh product accounts for 40 to 30 percent by weight and has a mercury concentration of 19 to 21 percent.

As a result, compared to conventional batteries, for the same nominal capacity, the required positive electrode active material can be reduced by 9%, and the negative electrode active material can be reduced by 3%. 1 with the same internal volume as the replacement spatula
The capacity was improved by 2 inches.

Table 1 shows a comparison with conventional batteries. The discharge capacity is 30Ω load discharge after 14 days of room temperature aging.

As stated above, the present invention improves the capacity and low temperature properties of alkaline silver oxide batteries, and has great industrial value.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional alkaline silver oxide battery, and FIG. 2 is a cross-sectional view of an alkaline silver oxide battery according to an embodiment of the present invention. 1... Positive electrode active material, 2a... 60-100 mesh frozen zinc, 2b
...Zinc hydrate of 200 to 250 metsii, 6...
··separator,

Claims (1)

[Claims] (11) In the negative electrode active material of an Alka IJ W silver ide battery using zinc as a living material, the particle size of zinc chloride is 60 to 1
An alkaline oxidation product characterized in that products with a particle size of 0.00 mesh account for 60 to 70% of the total weight ratio, and products with a particle size of 200 to 250 mesh of frozen zinc account for 40 to 30% of the total weight ratio. silver battery. (Zinc 21 hydrate is characterized in that products with a particle size of 60 to 100 mesh have a mercury concentration of 7 to 9%, and products with a particle size of 2 (10 to 250 mesh have a mercury concentration of 19 to 21%). An alkaline silver oxide battery according to claim 1.