JPS60140658A - Production of electrode plate for alkaline storage battery - Google Patents

Abstract

PURPOSE:To easily secure a high impregnation quantity by forming a flow of an active material raw salt solution in fine holes of a sintered body forcibly from outside. CONSTITUTION:A nickel porous sintered body 1 is fed to a tank 2 filled with a cadmium chloride solution. A partition 3 is provided in the tank 2, and the cadmium chloride solution is fed from one side of the partition 3 through a raw salt feed pipe 4. At the same time, the raw salt solution is discharged from the other side of the partition 3 throuth a raw salt discharge pipe 5, thereby a flow in the fixed direction is formed in fine holes of a sintered body 1. Accordingly, the sintered body 1 filled with the active material raw salt in its fine holes is activated in a sodium hydroxide solution then is washed in water. By repeating the above process, the nickel porous sintered body can be filled with the active material raw salt in its fine holes in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention (A) relates to a method for manufacturing an electrode plate for an alkaline storage battery, and particularly relates to filling a porous nickel sintered body with an active material.

Since 61, the method for producing alkali W and battery electrode plates is to produce a nickel porous sintered body obtained by sintering carbonyl nickel powder or its slurry in hydrogen at a temperature of 700 to 1000°C in an elementary atmosphere. is immersed in a solution of cadmium or nickel acid, the impregnated nitrate is electrolytically reduced in a caustic alkaline solution using a nickel plate as a counter electrode, and the active material is filled by repeating the water washing and drying steps several times. was. However, in this method (hereinafter referred to as "conventional method 1"), when converting nitrate into an active material, each time 10
It is necessary to apply electricity to A/DMJ level, electrolytic equipment,
This was disadvantageous in terms of power consumption. Furthermore, in the case of a cathode plate, for example, the active material thickly adheres to the surface of the sintered body each time it is electrolyzed, which has the disadvantage of reducing the sealing reaction efficiency of the battery and reducing the rapid charging performance of the battery. . On the other hand, as a method to reduce the adhesion to the surface of the sintered body, which reduces the sealing reaction efficiency, chemically replacing the raw material salt of the active material impregnated in the sintered body in a caustic alkaline solution. A method of turning the sintered body into an active material (hydroxidation) (hereinafter referred to as "conventional method 2") has been proposed.In this method, by not drying after washing the alkali with water, the surface of the sintered body is clogged with the active material. This can alleviate the tendency for the amount of active material impregnated to reach a plateau, but since the replacement of water in the pores with the active material raw salt is controlled by the diffusion rate, the replacement rate is slow, and depending on the raw material salt, it may be The pH increases due to the cadmium or nickel hydroxide impregnated into the nickel, making it difficult to ensure a sufficient amount of active material.

The present invention was made to eliminate the above-mentioned drawbacks, and aims to reduce adhesion of active material to the surface of a sintered body and ensure a high amount of active material impregnated.

In order to achieve the above object, the present invention provides a system in which, when a nickel porous sintered body is immersed in an active material raw material salt solution, a flow is forcibly formed from the outside in the pores of the sintered body. This is a method for producing electrode plates for alkaline storage batteries that increases the substitution rate, fills the pores with the active material raw salt in a short time, and easily secures a high impregnation amount.

An embodiment of the present invention will be described.

The nickel porous sintered body 1 is supplied to a tank 2 containing a cadmium chloride solution having a specific gravity of 175 and a temperature of 30°C. A partition wall 3;f: is provided in the tank 2, and a cadmium chloride solution is supplied from one of the partition walls 3 through a raw salt supply pipe 4. At the same time, by removing the raw salt solution from the opposite side of the partition wall 3 through the raw salt discharge pipe 5, a flow in a fixed direction is formed in the pores of the sintered body 1. The sintered body 1 whose pores are filled with active material raw salt in this manner is converted into an active material in a 20% sodium hydroxide solution at 30° C., and then washed with water. The above steps were repeated six times.

The single plate capacity of the cathode plate obtained in this way is much higher than that of conventional method 2, which did not create a flow, and the time required for replacement is also 2/3.
It could be shortened to the following.

As described above, according to the present invention, it is possible to fill the active material raw material salt into the pores of the nickel porous sintered body in a shorter time than in the conventional method. This has the effect of reducing clogging caused by the active material and dissolution of the sintered body.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing an apparatus according to an embodiment of the present invention, and FIG. 2 is a comparative curve diagram showing the discharge characteristics of the cathode plate. 1 is a nickel porous sintered body, 2 is a tank, 3 is a partition wall, 4 is a raw salt supply pipe, 5 is a raw salt discharge pipe Patent applicant Figure 2 Discharge darkness (minutes)

Claims (1)

[Claims] When a nickel porous sintered body is immersed in an active material raw material and filled with active material, A method for producing an electrode plate for an alkaline storage battery, which is characterized by forming a flow in a fixed direction in the solid pores.