JPS584262A - Argentic-oxide battery - Google Patents

Abstract

PURPOSE:To prevent any internal short-circuit which might develop due to the decomposition of argentic-oxide oxide by providing a cellophane, which is a component of a separator, which many penetrating holes which are fine to such a degree that oxygen is allowed to pass but the movement of silver ions is blocked. CONSTITUTION:As illustrated in the figure 1, in which a argentic-oxide battery is indicated, a separator 3 is provided between an electrolyte absorbing body 6 and a positive balck mix 1. The separator 3, as illustrated in the figure 2, is prepared by laminating graft film 5 over both surfaces of a cellophane 4 provided with numbers of fine holes 4a. since hydrogen produced in the positive electrode apidly moves toward the negative electrode, the reaction between oxygen and the cellophane 4 is reduced, an increased amount of silver ions are catched by the cellophane 4, and any internal short-circuit which might be caused by silver ions is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvement of a silver oxide battery, and an object thereof is to prevent the occurrence of internal short circuits due to decomposition of silver oxide.

Generally, in a silver oxide battery, neutralized silver oxide during storage decomposes into 2Ag0-AKsO+''/20s as shown below to generate oxygen, and this oxygen reacts with the cellophane constituting the cage pallet. However, there is a problem in that the cellophane's capture effect on chain ions decreases, and the silver ions migrate to the negative electrode side, causing an internal short circuit. This invention was made in consideration of these circumstances. By providing a large number of minute through-holes that allow oxygen to pass through cellophane as a component of the dragon parator, but prevent the movement of silver ions, the internal In other words, this invention is made by graft polymerizing polyolefin film with acrylic acid, preferably methacrylic acid, and disposing a graft film on one or both sides of cellophane having many micropores to prevent the occurrence of short circuits. A separator is disposed between the positive electrode mixture, the electrolyte absorber, and the electrolyte absorber so that its graft film is opposed to the positive electrode mixture. Oxygen generated on the positive electrode side due to the decomposition of silver moves to the negative electrode side, so that the reaction between oxygen and zinc is more obstructed than the reaction between oxygen and one palate. Although the consumption of cellophane by oxygen is reduced, the waiting time for the cellophane to actually pass through the cellophane is increased, and the cellophane is consumed by the cellophane reaction before moving to the negative electrode side. A hole is made in the hole to allow oxygen to pass through.
If this is done, the oxygen generated on the positive electrode side will quickly move to the negative electrode side, reducing the reaction between oxygen and cellophane. However, if the pores are too large, the effect of trapping silver ions will be reduced, leading to internal short circuits. This will cause - to -
The hole to be drilled in the cellophane depends on the thickness of the cellophane (PC%), but in general, the thickness of the cellophane cell used in 0110 batteries is 10 to 1,000μ, especially 20 to 50μWXO. , 10 to 200 degrees.

In order to construct a separator using 9-cellehan having a large number of micropores as described above, a graft film obtained by graft polymerizing atarylic acid or methacrylic acid to a polyolefin film is placed on one or both sides of the ryurohan O. In this case, arrangement simply refers to stacking cellophane and graft film and lining cellophane and graft film. To incorporate such a separator into a battery, the connection between the positive electrode mixture and the electrolyte absorber must be made such that the film side faces the positive electrode mixture so that the cellophane does not come into direct contact with the positive electrode mixture. This is done by passing it through the space provided. As a graft fill, Rai Research Covolesi II
y (RAI iLesemch Corporation
The one commercially available under the trade name Permion (trade name) is preferably used.

FIG. 1 shows a silver oxide battery of the present invention (1
) is the positive electrode mixture, (2) is a stainless steel annular pedestal fixed to the periphery of the positive electrode mixture (1), and (3) is a separator, which is shown in Figure 2. Graft film (5) I<s) is laminated on both sides of cellophane (4) having a large number of micropores (4 holes) as shown in FIG. (6) is an electrolyte absorber made of polyglysbylene nonwoven fabric, and the seven pallets (3) are disposed between the electrolyte collector (6) and the positive electrode mixture (1).
(1) is a negative electrode material made by mixing amalgamated zinc powder and a gelling agent such as sodium polyacrylate.
is a positive electrode can made of iron with nickel plating on the surface (9
) is a negative electrode can made of steel-steel-nickel clad plate, and Q
4) is fitted onto the periphery of the negative electrode can (9), and is attached to the positive electrode can (1).
This is an annular gasket made by Naishin 1111 that seals the opening of the pipe. The electrolyte contained 4.5% zinc oxide (wt%).
(Similarly below) A dissolved 25% aqueous sodium hydroxide solution is used, and 28 μl of it is injected into the battery.

The following Table 1 shows battery A of this invention and conventional battery B, one each,
1,000 pieces were stored for a predetermined period of time and the number of occurrences of internal short circuits was investigated.

1st table battery system 11 s, s consisting of the configuration as shown in the diagram
111% Height 2.7■ O-button ferric oxide battery, separator has an average particle size of 1! A 4゜pg thick film with a large number of micropores of sOpm and a thickness of 1spwso soft film (9F film made by graft polymerizing methacrylic acid to a low density polyethylene film, product winter parden on F) -219340/2g, produced by Rai Linarde Koboreshi Co., Ltd.) was lined with water, and Tomono Ap1 positive electrode mixture was made from 30 parts of silver oxide γos (parts by weight, the same applies hereinafter)) and 30 parts of silver oxide. Silver oxide powder gsow
The negative electrode zinc is 80 dA and battery B has a separator on both sides of a 40 μ thick regular 0-ka cellophane (i.e. cellophane with micropores and no I/%). The O-graft film was lined with the O-graft film as described above.
This is a silver oxide battery having the same structure as Battery A except for the following.

As shown in Iris 111K, this tJ*@0 battery A has fewer internal short circuits than the conventional electric battery BK.

In the example, a separator with a large number of micropores and G97 film stacked on both sides of the Kowloon Rohan O was used, but it is also possible to use a separator that simply stacks both 1IIK G77 films of the 7U Han. It is also possible to stack the film on only one side of the body, or it is also possible to stack the film on one side. When assembling the battery into the separator in the pigeon house, it is necessary to arrange the graft film between the electrolyte collecting body and the positive electrode mixture so that the graft film side faces the positive electrode mixture.

As a blind cathode mixture, disilver oxide powder and oxidized silver powder O
A 9-layer S structure was pressure-molded and used, but instead, a p-oxidized silver layer and a silver layer were sequentially formed on the circumferential IIK layer of the oxidized irises layer, resulting in a positive electrode assembly with a 93-layer structure. It is also possible to use a positive electrode mixture of 1060 types such as %1-h6 @II mold micropore 4
In Figure 2, m) indicates a line that penetrates straight from one OS to the other side, and it may not be a hole as long as there is a connection from one side Owi to the other side 0, It may be a complicated 10, or it may be different in size between the O-picture and the mercurial O-plane. This is because the fleeting lO becomes high pressure and moves to the negative electrode side.According to ζOli Akira, oxygen generated on the positive electrode side reacts with zinc on the negative electrode side, and negative electrode zinc O consumption due to oxygen occurs. occurs, but the amount is at most l~z$8ffi], and the fact that p can also prevent the occurrence of internal short circuits is much more significant.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view showing one embodiment of the silver oxide battery of the present invention, and Figure 2 is an enlarged view of the battery shown in Figure 1, with the main part being the 0(1) plate. −・Positive electrode mixture −) −・Separator (4) − Separator (4 tungsten)
-・Micropore (li)−・Gutsu 7 film (@)−Electrolytic i [Central body

Claims (1)

[Claims] L One side of cellophane (4) with many micropores (4 heat)
9 is a separator (3) formed by graft-polymerizing acrylic or methacrylic acid onto a polyolefin film 5 and arranging a 9-graft film (6) on both sides, with the 97-graft film (5) side facing the positive electrode mixture (1). A disilver oxide battery, characterized in that it is disposed between a positive electrode mixture (1) and an electrolyte absorber (.).