JPS6164066A - Silver oxide battery - Google Patents

Abstract

PURPOSE:To stably control the voltage of a silver oxide battery be bringing the silver layer of the positive active material into electric contact with the inner bottom surface of the positive case and adjusting the ratio of the amount of silver to that of silver oxide in the positive active material to at least a specified level. CONSTITUTION:A silver layer 2 is reliably brought into electric contact with the inner bottom surface of a positive case 1. It can be formed by such a method as follows: (1) stamping a sheet from silver foil before placing the sheet in a positive case 1; (2) weighing a necessary amount of silver powder before fixing it to the inner bottom surface of the positive case 1 by pressure; (3) reducing the bottom surface of a positive active material 3 composed of silver oxide alone or a mixture consisting of silver oxide and argentous oxide before the positive active material 3 is placed in the positive case 1. It is necessary that silver always exists in the positive case in spite of equilibrium reaction. Regardless of the proportions of argentous oxide and silver oxide in the positive active material 3, the voltage of the battery can be completely controlled by using at least 0.05g of silver per 1g of silver oxide in the positive active material.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a ferric oxide battery using ferric oxide or a mixture of silver oxide and ferric oxide as a positive electrode active material for use in small portable electronic devices, etc. It is.

Conventional technology and the r-point between them With the spread of small portable electronic devices, small and large size silver oxide M! However, when ferric oxide, which has a higher discharge capacity per unit volume than silver oxide, is used alone or in combination with silver oxide as a positive electrode active material, the discharge reaction is caused by oxidation. 1.8V, the potential at which ferric silver is reduced to silver oxide, and 1.8V, the potential at which silver oxide is reduced to silver.
There was a drawback that it was in two stages with 5V.

The idea to eliminate this drawback is to directly transfer the silver oxide in the positive electrode active material to the positive electrode container, which also serves as the positive electrode current collector. It is important not to let them touch it.

For example, Kikufutsu No. 52-62629, Japanese Unexamined Patent Publication No. 5
As shown in each publication No. 5-j6233, a tA layer is provided between the anode mixture and the anode can, and
6, 56-29831, and 56-29852, 75M made of silver or a mixture of silver and silver oxide is provided at the mouth of the anode mixture facing the cathode. .

However, since the former method only physically contacts the anode mixture and the anode can, control of the battery voltage becomes unstable, and the latter method reduces the visibility of the cathode active material by the thickness of the thin layer. However, with the trend toward smaller batteries, it has been difficult to maintain the capacity, which has not been overcome.

OBJECTS OF THE INVENTION The present invention relates to a ferric oxide battery that uses ferric oxide alone or in combination with silver oxide as a positive electrode active material, and its purpose is to stabilize control of battery voltage.

Structure of the Invention The present invention is directed to controlling the battery voltage in the above-described silver oxide battery by ensuring that the silver layer provided in the positive electrode container, which also serves as a positive electrode current collector, is in reliable contact with the positive electrode container, and that the silver layer is in contact with the positive electrode container. This was done by focusing on the fact that it depends on quantity. That is, the second silver oxide in the positive electrode active material oxidizes the silver layer and changes it into silver oxide, and at the same time is itself reduced to become silver oxide. The silver oxide thus produced is reduced to silver by discharge, and is oxidized again by the second silver oxide in the positive electrode active material to become silver oxide, thereby controlling the battery voltage through an equilibrium reaction. It is a necessary condition that silver is always present in the positive electrode container during the course of this equilibrium reaction.

Embodiment FIG. 1 is a cross-sectional view of a silver oxide battery according to the present invention, in which 1 is a positive electrode container that also serves as a positive electrode current collector, and 2 is a positive electrode container that is provided to ensure electrical contact with the inner bottom surface of the positive electrode container. 5 is a positive electrode active material consisting of a second oxidized chain alone or a mixture of second silver oxide and silver oxide; 4 is a negative electrode container that also serves as a negative electrode current collector;
5 is a negative electrode active material, 6 is a plastic semipermeable membrane, 7 is a pallet made of a plurality of layers of cellophane, and 7 is an electrolyte retaining layer made of impure cloth. 8 is a gasket. The silver layer 2 can be formed by punching out silver foil and inserting it into the cathode container 1, by weighing the necessary amount of silver powder, inserting it, and pressing it together, or by reducing the bottom surface of the cathode active material 5 and inserting it into the cathode container 1. It can be provided by etc.

At this time, only the amount of silver that can always be present in the positive electrode container is required for the above-mentioned equilibrium reaction.

Table 1 shows that a silver layer was formed on the inner bottom surface of the positive electrode container by varying the amount of silver per 1 g of ferric oxide by weighing silver powder, and the composition of the positive electrode active material was also varied. 7J3 "100 button-shaped ferric oxide batteries with a diameter of 1.6 mm in height were manufactured, and the number of batteries for which the voltage of each battery could be controlled is shown.

Table 1 From Table 1, if the ratio of silver to 1 g of silver oxide in the positive electrode active material is 0.0.05 g or more, voltage control is possible no matter what the composition of silver oxide and silver oxide is. I know it will become perfect.

Effects of the Invention As detailed in the Examples, the present invention has the advantage of reducing the amount of silver provided on the inner bottom surface of the positive electrode container to 1 g of silver oxide in the positive electrode active material.
Convert it to a hit ratio and convert the P to 0.0.05
g or more, a silver oxide battery with perfect voltage control can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a silver oxide battery according to the present invention. 1... Positive electrode container 2...Silver layer 5... Positive electrode active material

Claims (1)

[Claims] A ferric oxide battery, characterized in that silver is placed in electrical contact with the inner bottom surface of a cathode container and in an amount of 0.05 g or more per 1 g of ferric oxide in the cathode active material.