JPS6040671B2 - Method for manufacturing sintered substrate for storage battery electrode - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a brazed substrate used for electrodes of nickel-cadmium storage batteries and the like.

Conventionally, sintered substrates used for electrodes in nickel-cadmium storage batteries are manufactured by applying slurry to a single slurry-supporting porous strip made of wire mesh, etc., and then drying and competitively bonding the slurry. When the slurry is applied thickly to the strip, the adhesion of the slurry deteriorates and the slurry layer tends to peel off and fall off during drying. Furthermore, when an electrode plate is manufactured by impregnating the sintered substrate obtained in this way with an active material, as the substrate becomes thicker, the active material separates from the slurry support porous band plate that serves as the current collector plate, increasing the electrical resistance. Therefore, the adhesion of the active material decreases, the current density distribution becomes non-uniform, and the utilization rate of the host material decreases. The present invention was made in view of the above circumstances, and its purpose is to provide good adhesion of the slurry even when the slurry is applied thickly, to prevent the slurry layer from peeling off or falling off during solidification, and to ensure good adhesion of the active material. The present invention provides a method for manufacturing a bonded substrate for storage battery electrodes that has good properties and can increase the utilization rate.

That is, the present invention provides a method for use in storage battery electrodes, which comprises applying and filling a plurality of slurry-supporting porous strips with slurry, combining the slurry-filled plates, and then drying and binding the composite slurry-filled plates. This is a method for manufacturing a sintered substrate. The method of the present invention will be explained below based on the drawings.

The drawing shows a sintered substrate manufacturing apparatus. In the drawing, 1 is a hopper having two slurry filling plate outlets la and lb at the bottom, and a slurry 2 is charged into the hopper 1. For example, in the case of producing a nickel bonded substrate, the slurry 2 may include 35 to 45 parts by weight of carbonyl nickel powder and 5 parts by weight of a 2 to 4% carboxymethyl cellulose aqueous solution.
A mixture consisting of 5 to 65 parts by weight is used. In the hopper 1 filled with slurry 2 in this way, the slurry 2 is passed through the two slurry support porous strips 3, 3 and coated on both sides thereof, and then the slurry 2 is coated with the slits 4, 4 while adjusting the coating thickness of each slurry 2. The slurry is delivered as slurry filling plates 5, 6 from different outlets la, la. In this case, as the slurry support porous strip 3, a lath sheet made of nickel-plated iron, punched metal, or nickel-plated metal plate is used. Further, the coating thickness of the slurry 2 applied to the slurry support porous strip 3 is adjusted as appropriate using the slits 4, 4 according to the desired thickness of the sintered substrate, but in a later process two slurry filling plates are used. In order to combine 6 and 5, slurry 2 is usually applied so that the inner surface is thinner than the outer surface. Next, the two slurry filling plates 5, 5 are combined while being guided by rolls 6, 6, respectively, to form a composite filling plate 7.

In this manner, after the slurry 2 is applied to both the slurry filling plates 5, 5, the composite is made in a paste state that does not dry, so that the adhesion of both slurry layers is good and the two are well bonded.
After that, the composite filling plate 7 was packed in a 100 to 200
The slurry 2 is dried by passing it through a drying furnace 8 in a heating atmosphere of 800 to 1000 qo and passing through a bran feeding furnace 9 in a reducing atmosphere of 800 to 1000 qo.
, 3, even if the slurry layer is thick, it will not peel off or fall off during aging. Furthermore, when Hosaka is manufactured by impregnating the thus obtained competitively bonded substrate 10 with an active material, since two slurry support porous strip plates 3, 3 are provided which serve as current collector plates, the coagulated substrate 10 is thick. Also, the active material is located near the porous strips 3, 3, and therefore the adhesion of the active material is high and the utilization rate of the active material is improved. Note that the present invention is not limited to a combination of two slurry filling plates 5, 5, but may be a combination of three or more slurry filling plates 5. Alternatively, one in which the slurry is coated and filled on one side of a slurry support porous band plate may be used. Next, examples of the present invention will be described. A nickel-plated mild steel punched sheet with a thickness of 0.1 and a porosity of 40% is used as the slurry support porous strip 3, and a density of 0.5 as the slurry 2.
Using a mixture of parts by weight of carbonyl nickel powder 4 of ~0.7 (cc) and parts by weight of 3% carboxymethyl cellulose aqueous solution 6, the slurry support porous strip 3,
3 is passed through the hopper 1 at a speed of 7 min, and the slurry 2 is applied to each of them to form slurry filling plates 5, 5 with a thickness of 3 ribs. It is dried in a drying oven 8 of 120 to 150 squares, and then sintered in a pseudo-sintering oven 9 in a reducing atmosphere at 850 to 950°C to obtain an Akatsuki substrate with a thickness of 3.0 and a porosity of 80%. Got 10.

In this case, as a result of observing the adhesion state of the dried slurry at the time of scaling, no peeling or falling off was observed.

In addition, the obtained Akatsuki substrate 101 was impregnated with nickel active material to produce an anode plate, and a storage battery was fabricated as a prototype together with a cadmium cathode plate, and the utilization rate of the nickel active material impregnated into the anode plate was investigated. It was found that the utilization rate was about 5 to 10% higher than that of a conventional non-binding substrate in which slurry was supported by a single porous slurry supporting band plate coated with a nickel active material. As is clear from the results of L.
According to the method of the present invention, the slurry-filled plates, which have been applied and filled with slurry separately in advance, are combined in an undried paste state, so the adhesion between the slurries on the composite-filled plate is excellent, and no voids are formed between the porous substrates. In addition, by appropriately adjusting the coating thickness when applying slurry to each porous strip, it is extremely easy to position each porous strip at the desired position in the thickness direction of the substrate when combining them. It can be easily and continuously manufactured.

Furthermore, since the single layer of Gyokon slurry is supported by multiple slurry support porous strips, it is particularly effective when making a relatively thick Gyokon board, and it is also possible to position multiple slurry support porous strips at appropriate positions. It can be easily arranged. Further, when an active material is applied to the competitively bonded substrate thus obtained, remarkable effects such as excellent adhesion and improved utilization of the active material are achieved.

[Brief explanation of the drawing]

The drawing is a schematic diagram of a bonded substrate manufacturing apparatus used in the method of the present invention. 1...Hopper, 2...Slurry, 3...Slurry support porous band plate, 5...Slurry filling plate, 7...--Composite filling plate, 8...Drying oven, 9 ...Akatsuki Aya Reactor, 10...Akatsuki Board.

Claims (1)

[Claims] 1. Production of a sintered substrate for a storage battery electrode, which comprises coating and filling a plurality of slurry-supporting porous strips with slurry, combining the slurry-filled plates, and then drying and sintering the composite slurry-filled plate. Method.