JPS58161251A - Manufacture of spiral positive plate for alkali cell - Google Patents

Abstract

PURPOSE:To improve the strength of a positive plate thus to lengthen the service life, by pressure molding a three-dimensionally continuous porous nickel material to compress a thin frame layer more than a thick frame layer thus producing a positive plate and winding spirally. CONSTITUTION:Sponge urethane resin having the thickness of 1.5mm., frame thickness of 60-80mu and porosity of 94% is adhered to another sponge urethane resin having the thickness of 0.6mm., frame thickness of 30-50mu and porosity of 97% then applied with nickel galvanization. Said porous nickel member is pressure molded to have the thickness of 1.1mm. to compress the thin frame layer more than the thick frame layer to form a layer having low porosity on one face. Then active substance is filled over said layer. After drying, it is impregnated with the dispersion liquid of fluorine resin then dried again and pressure molded to provide the thickness of 0.68mm.. Thus produced positive plate is combined with a negative plate through a separator while bringing the layer compressed stronger to the outside and formed into a spiral. Consequently the strength of the positive plate is improved resulting in the lengthened service life.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to pressure forming a sponge-like porous nickel body having a three-dimensionally continuous structure having a thickness W of the skeleton in the thickness direction. The aim is to improve the battery performance and extend the life of the T! by compressing the L-mo more strongly than the thick layer of the skeleton to create a positive hii, and then winding it in a spiral shape after the T-coat. It is.

Conventionally, a sintered body of nickel powder has been used as a substrate for the board of alkaline batteries, but its porosity is 70~
It is about 80% dark, and increasing the porosity beyond this will significantly reduce the mechanical @1 chamber, so there will be 1
When the EjTh active material is filled, there is a drawback that deformation of the substrate, cracking, and peeling of the active material occur. When filling the raw material 6, it is necessary to use a method called the impregnation method, i.e. water containing nickel salts such as nitric acid or nickel sulfate.
A method is used in which a substrate is impregnated with a glf solution, then treated with an aqueous alkaline solution, and then the operations of washing with hot water and drying are repeated. However, the amount of liquid that can be filled with the second operation is small, and the amount of liquid that can be filled from the second time onwards gradually decreases, so it is usually necessary to repeat the operation 4 to 10 times. The disadvantage of this is that the manufacturing process is in-line, which reduces economic costs.

Therefore, in recent years, attention has been paid to a method of directly filling a paste-like material into a sponge-like porous body of cold nickel having a three-dimensionally continuous structure of T and H4.

A porous body having three-dimensionally continuous Lj-shaped bamboo has a high porosity of 90 to 98% and high mechanical strength.

Moreover, since the pore size is large, if you fill this porous material with a material, you can make it look like a high-quality product, and the filling method is simple and easy! The subsequent process is O
The 4Cs are economically advantageous due to their high performance.

However, due to the large pore diameter of the porous body, electrical contact between the nickel porous body and the active material powder and between the active material particles cannot be obtained in the light beam, so it cannot be used. There is a deficiency in that the rate is low.In order to solve this problem, by offering nickel-made conductive materials and various additives,
The usage rate is above 〕1〉.

The larger the pore size, the worse the retention of the active material.
There is also a drawback that when the iE material is wound into a spiral, the active material may peel or crack or the facing plate may be cut.

The present invention provides a simple one-pronged construction method that can solve this drawback, namely, by press-molding sponge-like nickel porous bodies with 2f inclinations with different skeleton thicknesses. If the thin 11'4 skeleton is shrunk more strongly than the thick skin of the skeleton, and the t-komono is used as a substrate to produce a new IF, the active material will be less likely to peel or crack, and the strength of the mounting plate will be greater. You can get a fighting board, and by using this number of strokes, you can get better at fighting! This is based on the fact that we found that λ is the same as the average temperature.

Examples and effects thereof will be described in detail below.

Thickness approximately 1.5 Mll, iV average pore diameter 0.3 silk, skeleton thickness 6 ( ) ~ 80p 4fL degree 94% · ) spongy tsuretanshigure, 1! 06 silk, 0.8 silk,
Glue one urethane sponge with a skeleton with a thickness of 30 to 51 μm and a pore size of 97% using ABS anti-greasing tetrahydrofuran M solution or the like. Then urethane resin 1
−ni Ni'Nokel'j 7 Kira! A sponge-like porous nickel body is manufactured using a known 7jffi process, which is then sintered in an inert atmosphere.

In this way, a sponge-like porous material having an average porosity of 95%, a thickness of about 2.2 m, and a skeleton having different thicknesses is obtained. This nickel porous body has a thickness of 51.1 f.
Pressure mold it so that it becomes l. From this 1, the thin skeleton 1 is stronger than the thick skeleton 1, and the hole σ is on one side.
A small complement of is formed. Next 1, with this net facing down,
A mixture of 85 parts of dihydroxide, 10 parts of dinokel powder, 5 parts of B and chloride was made into a paste with an aqueous solution of carboxymethylcellulose, and 4 parts of the paste was filled. In this way, by filling the active material in paste form using the small pores 1- of the porous IW, the paste is filtered by the 1-, and the filling density of the active material can be increased. You can do it. Next, the porous body filled with the active material is dried, impregnated with a fluororesin dispersion, and dried.
After 71 pieces, the pieces are hammered and shaped so that the number of pieces is in the order of 068. In this way, the 11th part of the temple board was made with a strong skeleton and the 11th part of the board was placed on the outside.

Conventionally known base type cadmium negative TI is applied through a nylon non-commercial separator! ! ! 8. Combine with temporary and wind it into a spiral, because of electrolysis. G, 1.800 (20
The public beak is 2.4a using OH water m solution for "Cl'"
I made a cylindrical sealed cadmium f/111 of h.

Next, as shown in Example 2, a battery (intercropped using Al and a nickel porous body with a uniform skeleton thickness compared to the conventional method) will be described.
20゛CO, using 20 ponds (81 and 20 each)
Figure 1 shows the variation in the discharge capacity of the t-section after 16 hours of standing at 10a and then discharging at 1vA.

From the figure, it can be seen that the t/1II (Al) according to the present invention has small variations and what is the nt valley of 2.6Ah to 2.7Ah. However, from 4C, it can be seen that the Ka(
81 has a large variation, and there are also 1 and 2, which only show a capacity of If as much as OAh. Furthermore, from among the ponds listed in T, the average volume weight is 1. (A1.tH+10 pieces each)
Repeat the charging/discharging cycle where l'≠discharge 1. Tei/11!4 = Check out life fko. The vomiting is shown in Figure 2. From the figure, it can be seen that the battery (Al) according to the invention shows no abnormality even after fi011 cycles and can secure sufficient capacity.

1. 711 pieces of music (from Kashina to the conventional f5 method) have a large proportion of low-capacity de, and 10I in 400 to 450 cycles.
A large 6-value decrease was observed in 8 of the III cases. Come on T! Comparing the cell life performance of the battery, it can be seen that the battery according to the present invention is superior in terms of life performance.

Why is it that a strong group of iE companies are advocating the use of nickel porous materials with different pore sizes for substrates, and that battery life can be extended due to the following effects? This is thought to be due to In other words, a porous body with a uniform skeleton thickness and pore diameter is filled with an active material, and a melted plate is wound in a spiral shape.In this case, the skeleton of the porous body is is easily cut off, but if one side of the porous body is compressed more strongly than the other side, and then the active material is injected with light, in the case of an iE number due to uninvention, the contraction A, The skeleton is outside the spiral.
However, it is believed that by absorbing such elongation, the skeleton can be prevented from being severed.

As described above, 1 As described above, according to the present invention, when rEFh temporary is wound in a spiral shape, the active material does not fall off or crack, or the drawing board is cut, and as a result, this l
By using 'E', it is possible to provide a battery with a long Q life.

4 Simplification of drawings @ f, c Explanation Figure 1 is a comparison diagram of the dispersion of the discharge voltage between the battery according to the present invention and the battery according to the conventional method. Showing the change of 6 deceptions (71 figures).

A...Battery according to the present invention, B...Based on the conventional method? A pond.

Claims (1)

[Claims] 1. By forming a sponge-like porous nickel material consisting of V4 knees with the thickness of the skeleton and having a three-dimensionally continuous 171 FWt structure, the thin layer of the skeleton is formed into a skeleton. Alka IJ is characterized in that it is compressed more strongly than thick +4, the nickel porous body is filled with an active material, further pressure molded, and then spirally wound. ! A manufacturing method for Ikegawa's roll-shaped front suspension. 2. The sponge-like porous nickel material is fixed in the H direction in the direction in which 2171% of the skeleton thickness is different, and this resin is packaged with metal plating. Patent? # Desired range @ Temporary manufacturing method for spiral positive Faii for alkaline batteries as described in item 1. 8. The alkaline battery according to item 1 of Patent Claim No. 11, characterized in that the active substance is filled into the nickel porous body with the skeleton being thin and strongly compressed and T:1lil being on the F side. Manufacturing method for spiral-shaped regular drawing boards. 4. The spiral positive for alkaline batteries according to claim 1, in which the nickel porous material is wound in a spiral shape so that the skeleton is thin and strongly twisted so that n, 1 thread is on the outside of the spiral. How to make a drawing board.