JPS5925173A - Manufacture of positive pole plate for alkaline battery - Google Patents

Abstract

PURPOSE:To obtain a positive pole plate having excellent discharge performance by simultaneously electrifying the porous nickel material serving as the anode pole on the occasion of impregnating the porous nickel material with the aqueous solution of nickel salt. CONSTITUTION:The aqueous solution obtained by using a mixture of the nickel nitrate of 90pts. and the cobalt nitrate of 10pts. is applied under reduced pressure to impregnate the porous nickel material like sponge with the hole diameter of 0.3mm., porosity of 96% and thickness of 0.68mm.. Then, a current is supplied with intensity of 30mA/cm<2> across the anode consisting of said porous nickel like sponge and the nickel plate used as the opposing plate in this aqueous solution. Moreover, a porous material is submerged into the aqueous solution of sodium hyroxide in order to convert the nickel salt impregnating the porous material into nickel hydroxide. Thereafter, the positive pole plate of this invention can be obtained by repeating three cycles of above operation including the washing and drying processes. A battery A using this positive pole plate has excellent discharge characteristic and high discharge capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a live material d holder such as a sponge-like nickel porous rod having a three-dimensional continuous structure as a holder for the living material a. Use Arca IJ 't[I for ML+
E-Temporary 0) Characteristics: When impregnating a nickel porous body with a nickel salt water bath solution, the nickel porous body is simultaneously energized as an anode (which improves the radiation performance). Our aim is to provide 11 iEi & boards.

Conventionally, a sintered body of nickel powder has been used as a substrate with a positive positive number of alkali rg, a. From now on
If the porosity is lowered to 11, its mechanical strength becomes questionable, and if the voids are filled with a positive active material, deformation of the base, cracks, and activation occur. There is one drawback that leads to a 111-year separation. A container for filling one active material,
The instant impregnation method is called a water bath of nickel salts such as nickel nitrate and nickel sulfate.
was impregnated onto the substrate under reduced pressure, and then treated with an alkaline water bath solution (
1. Then wash with hot water and dry! −@ +1
+ A method of harvesting money is used. However, the number of Ifts filled by the -th operation is small, and moreover, the Ift is filled from the second time. The number of moths gradually decreases, so usually 4~
Is it necessary to return one crop after 10 grindings?The disadvantage is that the manufacturing process is multiplexed and the cost of labor is high.

Therefore, in recent years, three-dimensional [1j+, lJj followed by 1: t+
A method of filling a sponge-like porous material made of nickel metal, which is used to roof a building, with a paste-like active material one by one is attracting attention.

A sponge-like porous nickel material having a three-dimensional continuous 1-f structure has a porosity of 90-98% and is mechanically strong. In addition, since the pore f is large, filling this porous body with live material R makes it possible to reduce the height of the positive motion plate to one plate, and the filling method is simplified.
! 4! Continuation process is possible and economical TT 4:lJ (!
: u le. Even if this sponge-like porous nickel material is used in the king-reducing impregnation method, the pore size is large and water-soluble impregnation is easy, and the number of filling operations can be reduced per month. Furthermore, there is a method called the molten salt impregnation method, in which 1A of nickel metal is melted in the crystallization water of the salt, and the substrate is impregnated with 1A of nickel, and then the same treatment as the reduced impregnation method is applied. It is also known that if a method is used in which positive □□□ numbers are produced by performing , it is possible to fill the active material in one operation. However, due to the large pore size of the porous body, sufficient air contact cannot be obtained between the Ni-Nokel porous body, which is the current collector, and the active material particles, and between the active material particles. The disadvantage is that the usage rate is low due to the inconvenience caused.

Usually, the utilization rate is improved by mixing cobalt salt with nickel salt, but it is insufficient to obtain electrical contact.

In the present invention, when an active material holder such as a sponge-like porous nickel material is impregnated with an aqueous solution of a mixture of a nickel salt and a cobalt salt, if current is applied to the porous nickel material as an anode, the discharge performance is improved. He sees what he does, and judges him here.

Hereinafter, practical examples of the present invention and their effects will be described in detail.

The moving plate used in the present invention is manufactured as follows.
,: First, nickel nitrate (NiN sulfur, 6Hz (J)
90 parts and 10 parts of cobalt nitrate? The mixture was prepared using a water bath of 1.570 (20'C) with a pore size of 03 silk, a porosity of 96%, and a water bath of 0.68 mm.
1. Impregnate the diagonal nickel porous material with reduced IT. Next, in this water bath 71, using nickel temporary as the opposite side, and using the sponge-like nickel porous material described in t as an anode positive, 30 m
- Apply current at a current density of A/aj. Further, the porous body was immersed in S, G, 1.220 (20°C) thorium hydroxide solution to impregnate the porous body, converting the nickel salt into nickel hydroxide, and then washing and Repeat the steps 2 and 3 times to dry the ill according to the present invention.
I got one Ikari. 8.0.1.25 in this iE tNJ number one sheet, two conventionally known paste-type negative i thin plates, and electrolyte.
1 flooded type battery (using 2 o'c potassium hydroxide aqueous solution),
0 hours full? [1, rkochi1. □Discharge IE using OA to find the utilization rate of living matter °d. FIG. 1 shows the change in the active material utilization rate when the blood flow time was changed to f: 8 when the porous body was used as an anode and the current was applied. From the figure, it can be seen that when energized (81), the effect is noticeable when it is applied for more than 3 minutes, but the effect is not significant even when energized for more than 15 minutes. It is also possible to fill the porous material with the active material G in the same way even if the porous material is immersed in an aqueous solution under reduced conditions.

Next, the total time is 7 minutes and 1. One positive drawing board and one set of cadmium negative and one tentative sheet were made using a separator of nylon non-woven fabric. G, 1.3[1(2
0"C) Using potassium hydroxide water bath solution, the nominal valley is 2,
Cylindrical sealed nickel cadmium 1f according to the invention of 4 A h! , I made 1-1111 and made one. A porous body was impregnated with a mixture of nickel nitrate and bta v cobalt in the middle of the hive, and then treated with alkaline water. Nozoki Ponds (I made 1 pond.I fixed these 6 ponds under light for 16 hours at 2oC, 0, 1OA.After that, I exposed them to QCA. It is shown in Figure 2. From the figure, it can be seen that the electrolyte 4 made by the present invention has better electric power, E retention Vt, and larger discharge @ than the conventional battery (3).

Why is it that when a porous body is impregnated with a water bath containing a mixture of nickel salts and cobalt salts, the porous body is used as an anode layer?
jfi: Froto 1 Kei? I don't know if 扛t'l3r7 is heading in the right direction, but I think it's due to the effects like ↓.''-Rano1ro. In other words, the anode of nickel imitation in a water injection solution containing cobalt salt/f1 ortho, example tha 1] M Also described in the June 1981-8146 bulletin Xt
As shown in nickel υM Table +II7, it has been shown that cobal 1-nickel oxide containing 2o~5~vL% of cobalt and 1~IQwt% of nickel is produced, but in the present invention, porous Use your body as an anode
It is thought that similar cobal-nickel oxides will be produced in this case as well. This cobalt-nickel oxide is more chemically active than cobalt hydroxide, and has great effects such as reducing oxygen generation, which is a competitive reaction during charging. 1 generated on the surface of the duck and the surface of the nickel hydroxide particles
The ``recession'' of the nickel hydroxide particles is very good at first glance, with 1fl between the porous body's skeleton and the nickel hydroxide particles, between the nickel hydroxide particles, and between the nickel hydroxide particles and cobalt hydroxide. It is thought that it also has the effect of improving the ash palatability between particles.Therefore, it is thought that the photodischarge reaction proceeds smoothly and uniformly, and there is less drop-off of living matter.

10,000, manufactured by impregnating with a mixed water bath solution of nickel salt and cobalt salt using the conventional method, there is a solid core of nickel hydroxide and cobalt hydroxide, but there is no contact inside the moving plate. If the charging and discharging is not carried out smoothly and the active material often falls off, it will be 4 times faster. 11. Similar effects can also be obtained by using a conventional sintered nickel substrate as an active material holder.

As described above, the present invention is to impregnate an active material support such as a sponge-like nickel porous body with a water bath solution of a mixture of nickel salt and cobalt salt, and to apply electricity to the porous body as an anode brass. This is why the performance of the river is outstanding.
We can provide oysters.

It has also been confirmed that a similar effect can be obtained by impregnating a porous body with a mixture of nickel salt and Kobal I salt by adding MDA to the crystallization water of these salts.

[Brief explanation of the drawing]

Figure 1 shows the change in the active material utilization rate when the porous body is used as an anode and the time is changed.
Figure 12 is a nickel-cadmium epsilon I-N11 by Akira Moto.
I GA with 1 and 1 and 1 small peaks
fJ father f continuation +t 1:S! Rideril. 6 liters capacity (Ah)

Claims (2)

[Claims] (1) A nickel salt, a nickel salt, and a holder for an active material such as a three-dimensionally continuous nickel porous material having a single structure.
For example, nickel nitrate or nickel sulfate and Koba 71
/ hklM, for example, a step of impregnating a water bath solution of a mixture with cobalt chloride or 49 cobal l-, etc., and a step of impregnating the above-mentioned mixed water (fJIVi) and energizing the active material support as an anode. Then, alkaline water ffl
IE temporary for alkaline electricity 11n is characterized by the process of immersing it in a solution, such as an aqueous solution of crosslinked sodium or potassium hydroxide in water, followed by washing and drying. Construction method. (2) Use the above living substance holder as an anode!
1E floor provisional manufacturing method for Alka IJ'+Ji pond according to claim 1, wherein the energization time is 3 to 15 minutes for 1 silk;