JPS5871561A - Zinc electrode for alkaline storage battery - Google Patents

Abstract

PURPOSE:To obtain a stable alkaline secondary battery that can prevent short- circuit caused by combining a porous separator which suppresses the growth of dendrite and improves the diffusion of an electrolyte by adding copper or copper oxide to a zinc active material. CONSTITUTION:A proper quantity of mixture solution containing those substances at a weight ratio of ZnO:Zn:Ca(OH)2:PTFE:CuO=70:10:10:5:5 is added to an active material, which shall be made into fibers, dried, and/pulverized. To improve the slipping tendency of a pulverized material, it can be heat-treated, for example, at 270 deg.C. A zinc electrode is obtained by press-molding thus manufactured active pulverized material while inserting a metallic porous body in the center of it and using the said metallic porous body as a core material. The recommended added quantities of copper or copper oxide are approximately 3 to 10wt% when converted into copper. A preventive effect is reduced slightly if the added quantity is 2wt%.

Description

[Detailed Description of the Invention] Conventional zinc electrodes for O-alkaline secondary batteries have extremely excellent initial characteristics due to their high energy efficiency and high output 4I properties; Tamekume porous cell
When combined with tar, there is a drawback that the growth of dendrites causes short circuits.

The present invention suppresses the growth of Puntorai PO and
0 Porous 4 for good diffusion! Even if combined with a dragon palator, the zinc electrode is stabilized by the l11jIt-fat retention and provides a nine-alkaline secondary battery], JIII
It is made by adding steel or copper oxide to the active material.

Next, let's talk about the actual implementation.

ZnO: Zn2〇a (OH)1:
PTF E:0uO=70:10:10:5
A suitable amount of mixed water mixed at a weight ratio of :50 is added to form fibers, which is dried and pulverized. In order to improve the consistency of the pulverized product, K can also be heat-treated, for example at 270°C. The thus produced pulverized active material is compression-molded with a metal porous body inserted in the center to obtain a zinc electrode using the metal porous body as a core material.

0a(OH)1 used in the drum acts as a dissolution inhibitor for zinc, and PTEF is Nonoingu, but Nonoingoo can be used with other fluororesin-based synthetic resins, polystyrene, etc. Various inders can be used.

A nickel-zinc battery with a nominal capacity of 10Ah was made by combining eight zinc electrodes of the present invention (theoretical capacity: 3.3Ah) and a nickel positive electrode. A cycle life test of 3 cycles per day was conducted. By the same manufacturing method as above, however,
An OIL plow electrode in which the added amount of OO was 3+s+'y+tUI by weight and a conventional O zinc electrode in which CuO was added were prepared, and a nickel-zinc battery was constructed in the same manner as described above.
I also made a comparative trial in the same way. The 0 test was conducted using 10 cells of each battery. As a result of the test, Cu as a zinc electrode
All of the 40 companies that met O were unable to produce am, and on the other hand, batteries that did not contain C had no K up to 100t cycles.
Five of the IG cells showed a short circuit, and the remaining five cells in the cycle above also showed a short circuit.

The same is true for the similar Nicle test where Cu0K was changed and Cut was used! This resulted in a long-life nickel-zinc battery that does not suffer from the second step phenomenon. Furthermore, a similar short-circuit prevention effect was also observed in chain zinc batteries when steel or steel oxide O was added.

According to various experimental results, it is preferable that the amount of O added to steel or steel oxide is #3 to #10 by weight in terms of steel, and if it is 2 by weight, the spinning effect of 7 O is slightly reduced. It was found that when the weight was 12 weight or more, the effect of preventing crosslinking was sufficient, but the battery capacity O tended to decrease.

According to this invention, the TL electrode made of steel or oxidized steel is used as a lead battery, and the short circuit of the 7 OPI part is fixed with fat, and the electrolytic ILO diffusion is made into a stormy state. The use of a porous cell/arm plate has the effect of providing a safe and long-life O battery system without 4-hour heating.

Patent applicant: Furukawa Battery Co., Ltd. Agent Kin Kitamura-・7・′ 2 people outside

Claims (1)

[Claims] Zinc electrode for alkaline storage batteries made by adding active zinc 1tK steel or steel oxide.