JPS58197684A - Air-zinc cell - Google Patents

Abstract

PURPOSE:To reduce a voltage drop due to load at the time of discharge as well as to secure an air-zinc cell that uses such a catalyzer as being simple in production besides cheap in price, by forming a unique something, to say, like an activated air layer made up of a catalytic layer and an air pole. CONSTITUTION:Graphite 0.5-2 of a conductive material and pulverulent tetrafluoroethylene resin (below 7mu) 0.52-2 as a water-repellent material are mixed in catalytic cupric oxide 1 in terms of weight percentage and furthermore they are placed on between a separator and an air pole in layered form. The air pole is, without burning, mixed with acetylene black 0.05-0.5 and pulverulent tetrafluoroethylene resin 0.05-0.5 and then pressurized and sealed in so that it is produced. Doing like tis, an air-zinc cell is formed up in an interspace between the air pole 6 and a zinc negative pole 2 via the separator and simultaneously depolarizing power by cupric oxide of a catalytic layer 5 is displayed whereby a higher voltage is not only maintained but brought into full play.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improving the air electrode of an air battery, and aims at improving battery performance and simplifying battery production.

Conventional air batteries are made by mixing powdered activated carbon or granular activated carbon with tar, pitch, etc., molding and firing it, and then treating it with Teflon to make it water repellent. It was pressurized and molded and used as an air electrode.

However, in the above conventional product, tar, pitch, etc. are intentionally added to the activated carbon, which is originally porous, in order to give it plate-shaped 51E type and strength, and as a result, the spaces between the 4-rus particles are blocked. Not only did it have to be fired at a high temperature, but it also required the hassle of adding or impregnating flannel wood to make it water repellent and then firing it. 21!! The composition of the three-phase interface, that is, the interface where air, electrolyte, and polarization meet, determines the performance of the battery, but if the formation of the Mita interface is not successful, the battery performance cannot be achieved.

Conventional methods for improving this include changing the blending ratio of water repellent materials, or adding silver (or its oxide), silver (or its oxide), /#ranocum, platinum, etc. to the air electrode as a catalyst. However, in order to maintain and improve the battery performance, it was necessary to increase the amount of catalyst, etc. added, and ifIgIit was required.

The present invention fundamentally improves this point, and forms a catalyst layer Y using cupric oxide as a catalyst, and as an air electrode, an acetylene blank and finely powdered tetrafluoroethylene resin are used without firing. It is a dramatic technological improvement that has not been seen before in that it consists of what can be called an activated air layer of the catalyst layer and the air electrode, which allows the battery to perform well just by mixing it. It has become.

Its characteristics are that there is little voltage drop due to the load when it is released, and it is simple and cheap to manufacture. This is something that could have been achieved.

In the present invention σ) Air - zinc battery C1 catalyst - is made of a mixture of cupric oxide, graphite and finely powdered 4-fluoride ethylene resin, and air i is a mixture of acetylene black and finely powdered 47-ethylene chloride resin. The catalyst layer is made of
The present invention, which is an air-zinc battery characterized by being structured in layers between a regulator and an air electrode, will be explained based on the drawings.

ill is the cathode plate, and (2) is mercury-frozen zinc grains or potash solution using the usual method. xymethylcellulose x (CM
C) An r-shaped lead negative electrode made of Yl ~ 1018, (3) is a nonwoven fabric electrolyte holding layer provided to hold the glue-like electrolyte, and (4) is a nonwoven fabric seven. Nogulator 1 (7) is a water-repellent current collector made of an air-permeable conductive material, and (8) is an air hole. (1G is an activated air layer, consisting of a catalyst layer (51) and an electric electrode (6). The air electrode (6) of the anode is acetylene black Y:
It is mixed with finely powdered 47-ethylene resin and further pressurized and molded. (5) is a catalyst layer consisting of a mixture of oxidized steel as a catalyst, graphite Y4 as a material, and finely powdered tetrafluoroethylene resin as a water repellent. (9) shows a conventional fired carbon electrode (air electrode).

In the present invention, graphite as a conductive material is 0.5 to 2, and fine powder is 4 as a water repellent to catalytically oxidized second steel IK. The air electrode is coated with acetylene black 0.05 to 0 without baking.
．． 5. It is manufactured by mixing 0.05 to 0.5 of a finely powdered polytetrafluoroethylene resin and sealing the mixture under pressure. By doing this, the air electrode in (6) and the air electrode in (2) can be connected through the separator.
At the same time that air is formed between the zinc negative electrode and the zinc negative electrode,
The depolarization ability of the catalyst layer (5) due to cupric oxide is also suppressed at the same time, allowing it to maintain and exhibit a higher voltage.

(Example) As a glue-like zinc negative electrode, 5 fl.
In contrast, a mixture of 1.0 ml of 30% KOH solution (saturated with ZnO and glued by containing 3 CMC) was used.

Also, 11! ! As the ultimate air electrode, commercially available acetylene black 0.1 and lil K were mixed with 0.1 g of finely powdered tetrafluoroethylene resin and sealed under pressure. As a catalyst layer, 0.2 g of oxidized second steel and 0 graphite were used.
．． 11 A mixture of 0.19% of finely powdered tetrafluoroethylene resin was added and mixed. Air created by K as above~
Figure 2 shows the results of discharging a zinc battery at 40Ω. Here, the cell is an air-zinc battery having an activated air layer according to the method of the present invention, and (B) is a conventional calcined carbon electrode (containing a silver powder catalyst). Figure 3 is a 40Ω load discharge curve of an air-to-zinc battery with RF4K.

As shown in the figure, it is clear that the air-zinc battery of the present invention uses inexpensive raw materials and a simple structure, and also exhibits superior battery performance, and its industrial value is great. .

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an air-zinc battery according to the present invention. FIG. 2 is a cross-sectional view of a conventional air-zinc battery. 1. Cathode plate 2. ... Glue-shaped zinc negative electrode 3
, . . . Electrolyte holding layer 4. ...Catalyst layer 6. ... air electrode 7, ... current collector 8. ...air hole 9, ...conventional calcined carbon electrode (Ag catalyst) 10, ...activated air layer Fig. 3 shows the discharge curve of the battery of the present invention under a 40Ω load in comparison with the conventional one. FIG. Figure 1 Figure 2

Claims (1)

[Claims] The catalyst layer is oxidized No. 241. ．． The air electrode is made of a mixture of acetylene black and finely powdered tetrafluoroethylene tree riv, and the air electrode is made of acetylene black and finely powdered tetrafluoroethylene tree
*i is an air-to-east lead battery consisting of a mixture of the above and the catalyst layer is structured in a layered manner in relation to the Dragon Lator E air electrode.