JPH02189862A - Paste type cd electrode for alkaline storage battery and manufacture thereof - Google Patents

Abstract

PURPOSE:To enhance the oxygen gas absorptiveness of electrode and suppress generation of hydrogen gas from the electrode under charging by providing an electroconductive layer including carbon powder and alkali metal powder mixedly on the surface of an active substance layer, and specifying the surface area of this alkali metal powder. CONSTITUTION:A conductive layer including carbon powder and alkali-resistant metal powder is provided on the surface of an active substance layer, wherein the surface area of this alkali-resistant metal powder shall be 0.001-0.05m<2> per g active substance. It is important to disperse this metal powder constituting the conductive layer uniformly in the conductive layer, which requires an apparent density of no more than 0.2g/cc. No.1 conductive layer consisting of alkali- resistant metal powder and glue is interposed between the active substance layer and No.2 conductive layer and put in close contact with the active substance layer, which will suppress generation of hydrogen gas from the alkali- resistant metal powder during charging.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a PACE-type cadmium electrode used in alkaline storage batteries such as nickel-cadmium storage batteries and a method for manufacturing the same.

(b) Prior Art As cadmium electrodes used in nickel-cadmium storage batteries and the like, non-sintered cadmium electrodes such as paste-type cadmium electrodes, which have a simple manufacturing process and are low in manufacturing cost, are widely used industrially. This type of cadmium electrode is made by applying a paste made by kneading an active material such as cadmium oxide powder or cadmium hydroxide powder with a glue liquid onto a conductive core.
It is manufactured by filling and then drying.

However, this type of non-sintered cadmium electrode has a problem of low oxygen gas absorption performance, and various proposals have been made to solve this problem.

For example, JP-A-60-2164/19, JP-A-6
1-240576 and the like proposes forming a conductive layer made of an alkali-resistant conductive material such as carbon or nickel on the surface of a PACE I type cadmium electrode plate. By doing so, it is possible to increase the conductivity of the surface of the cadmium electrode plate, promote the generation of metal cadmium on the surface of the electrode plate, and increase the oxygen gas absorption capacity.

However, even in such a method, there is still a need for even better oxygen gas absorption ability, and other new problems have arisen.

(c) Problem to be solved by the invention When a conductive layer made of carbon powder is formed on the surface of a paste-type cadmium electrode plate, metal cadmium is generated at the interface between the conductive layer and the active material layer during charging. promoted,
Oxygen gas absorption performance is improved. However, it does not have the effect of promoting the production of metal cadmium in and on the surface of the conductive layer, where the reaction with oxygen gas is most likely to proceed, and there is still room for improvement in oxygen gas absorption performance.

On the other hand, if a conductive layer made of a metal resistant conductive material, such as nickel powder, is simply formed on the surface of a paste-type cadmium electrode plate, the formation of metallic cadmium during charging is inhibited due to the high conductivity of the conductive material. It can be used as a core. As a result, in the conductive layer and on its surface,
Metallic cadmium is produced, and the oxygen gas absorption performance is further improved than when carbon powder is used. however,
New problems arise during charging, such as accelerated generation of hydrogen gas, decreased storage characteristics of the battery, and accelerated formation of dendrites.

Furthermore, as an intermediate method between the above two methods, it is conceivable to form a mixed layer of carbon powder and alkali-resistant metal powder on the surface of the paste-type cadmium electrode plate. However, even in this method, simply using, for example, nickel as the alkali-resistant metal powder basically has the problems of the above two methods. Therefore, in order to solve the above problem while maintaining the effect of improving oxygen gas absorption performance, it is necessary to consider the state of existence of the alkali-resistant metal powder in the conductive layer.

The apparent density of the alkali-resistant metal powder is usually 0.
2g/cc or more (e.g. carbonyl nitrogen 0.5
g/cc), it is extremely difficult to uniformly disperse the carbon powder into a slurry made of carbon powder and paste. Therefore, in the conductive layer formed by applying and drying this slurry onto the surface of the electrode plate, the alkali-resistant metal powder is also difficult to be uniformly dispersed.

Furthermore, metals such as nickel and iron, which are alkali-resistant metals, have a lower hydrogen generation overvoltage than cadmium compounds such as cadmium oxide, which are active materials, and if the conductivity of the conductive layer becomes too high, the liquid-solid interface When charging, hydrogen gas may be generated. Therefore, it is necessary to regulate the form and amount of nickel added.

When nickel powder is used as the alkali-resistant conductive powder, the conductive part with the conductive layer on the surface of the electrode plate is
Therefore, only nickel in the conductive layer can contribute to improving conductivity in the area where the metal cadmium generated during charging reaches the surface of the electrode plate.Also, in order to increase the amount of nickel used, If the amount of nickel added is increased, the conductivity of the conductive layer becomes too high as mentioned above,
Problems such as generation of hydrogen gas arise.

On the other hand, when the surface of a paste-type cadmium electrode plate is subjected to nickel plating, the surface of the electrode plate is blocked by a nickel layer, which is undesirable because hydrogen gas generation is accelerated and electrode reaction is inhibited.

Furthermore, when metal fibers are added to the conductive layer, it is effective in easily forming a metal cadmium network on the surface of the paste-type cadmium electrode plate. It is thick, several tens of micrometers, and has poor flexibility, so it will break through the separator. As a result, an internal short circuit in the battery may occur.

(c) Problems to be Solved by the Invention The present invention has been made in view of the above-mentioned problems, and the main purpose of the present invention is to further improve the oxygen gas absorption performance of a paste-type cadmium electrode. It is in.

Another purpose is to suppress hydrogen gas generation from cadmium compounds during charging.

Still another object is to suppress the generation of dendrites from the cadmium electrode during charging.

Another object of the present invention is to propose a method for uniformly dispersing alkali-resistant metal powder when a conductive layer made of alkali-resistant conductive powder is formed on the surface of a paste-type cadmium electrode plate.

Still another object is to suppress short circuits within the battery due to the nickel bodies when the nickel bodies are dispersed on the surface of the paste-type cadmium electrode plate.

(d) Means for Solving the Problems The first paste-type cadmium electrode for alkaline storage batteries of the present invention has a carbon powder and a resistant material on the surface of an active material layer mainly composed of cadmium oxide applied to a conductive core. It has a conductive layer in which alkaline metal powder is mixed, and the surface area of the alkali-resistant metal powder is 0.001 to 0.05 m' with respect to 1 g of the active material.

In addition, the manufacturing method includes applying an active material containing cadmium oxide as a main component to a conductive core to form an active material layer, and carbon powder and alkali-resistant metal powder are mixed on the surface of the active material layer. A manufacturing method in which a conductive layer is provided, wherein the surface area of the alkali-resistant metal powder is 0 per 1 g of the active material.
．． 001 to 0.05 m'.

In addition, the paste-type cadmium electrode for alkaline storage batteries of the second invention is a conductive material in which carbon powder and alkali-resistant metal powder are mixed on the surface of an active material layer mainly composed of cadmium oxide applied to a conductive core. The conductive layer includes carbon powder, a glue, and an apparent density of 0.
2g 7ccJ:) It is characterized by consisting of the following alkali-resistant metal powder.

In addition, the manufacturing method includes applying an active material containing cadmium oxide as a main component to a conductive core to form an active material layer, and adding carbon powder, a glue, and an apparent density to the surface of the active material layer. 0.
A conductive layer is formed by applying a slurry obtained by kneading 2 g/cc or less of alkali-resistant metal powder and drying it.

Further, in the paste-type cadmium electrode for alkaline storage batteries according to the third aspect of the present invention, a first conductive layer made of an alkali-resistant metal powder and a glue is applied to the surface of the active material layer mainly composed of cadmium oxide applied to a conductive core. layer and a second conductive layer made of carbon powder and paste, and is characterized in that the first conductive layer is disposed closely to the active material layer.

In addition, the manufacturing method involves depositing a first slurry made of alkali-resistant metal powder and glue on the surface of an active material layer mainly composed of cadmium oxide applied to a conductive core, and drying the slurry. After forming the conductive layer, a second slurry (=I) consisting of carbon powder and glue is applied, dried, and a second slurry is applied.
It is characterized by forming a conductive layer of.

In the paste-type cadmium electrode for alkaline storage batteries and its manufacturing method described in Section 2, it is preferable to use nickel powder as the alkali-resistant metal powder.

Furthermore, in the first base I type cadmium electrode for alkaline storage batteries of the present invention, fibrous nickel with an average fiber diameter of 1 μm or less is coated on the surface of the active material layer mainly composed of cadmium oxide applied to the conductive core. body or/and average particle size is 1 μm
It is characterized by dispersing the following nickel bodies.

In addition, the manufacturing method includes coating an active material mainly composed of cadmium oxide on a conductive core to form an active material layer, and then applying fibrous nickel having an average fiber diameter of 1 μm or less on the surface of the active material layer. This method is characterized by dispersing and adding nickel bodies and/or nickel bodies having an average particle size of ]μm or less.

Here, the nickel body is characterized in that particles having a particle structure in which particles are connected in a certain direction by contact or smelting are dispersed and added.

(E) Function In the paste-type cadmium electrode for alkaline storage batteries of the first invention, the alkali-resistant metal powder in the conductive layer containing carbon powder serves as a core itself, and during charging, the metal cadmium is transferred to the surface of the electrode plate. It has the effect of causing the generation of Due to this effect and the effect of promoting the generation of metallic cadmium at the interface between the conductive layer made of carbon powder and the active material layer on the surface of the electrode plate, the oxygen gas absorption performance of the cadmium electrode is further improved. ”

In addition, for the effect of improving oxygen gas absorption performance, it is sufficient that the generation of metal cadmium on the surface of the electrode plate is uniform, and the generation of an excessive amount of metal cadmium is due to active material migration,
This causes harmful effects such as dendrite formation. therefore,
It is not preferable to add an excessive amount of alkali-resistant metal powder. Further, excessive addition of alkali-resistant metal powder may cause problems such as deterioration/stiffness of storage characteristics of the battery and generation of hydrogen gas. Therefore, the inventor
After examining various conditions, it was found that in the physical properties of the alkali-resistant metal powder, the factor most closely related to hydrogen gas generation is the total surface area of the metal powder per unit weight of the active material. In order to solve the above-mentioned problem, the total surface area of the metal powder should be 1g of active material, keeping in mind that the alkano-resistant metal powder is the nucleus for the production of metal cadmium, and it is desirable that its surface area be large. It has been learned that the optimum distance is 0.001 to 0.05 m'.

Furthermore, in the paste-type cadmium electrode for an alkaline storage battery according to the second aspect of the present invention, the conductive layer made of carbon powder basically promotes the generation of metallic cadmium at the interface with the active material layer, as described above. When an alkali-resistant metal powder is added to the conductive layer, this alkali-resistant metal powder promotes the formation of metal cadmium inside the conductive layer.

It is effective to generate metal cadmium inside the conductive layer more uniformly, and by doing so, metal cadmium can be generated in a wide range inside the conductive layer and at the interface with the active material layer. becomes possible. As a result, the oxygen gas absorption performance is improved and the cycle life is not reduced. Therefore, it is important to uniformly disperse the alkali-resistant metal powder constituting the conductive layer in the conductive layer, and it has been found that powder with a low apparent density is suitable for this purpose. Therefore, various experiments were conducted and it was discovered that when the apparent density is 0.2 g 7 cc or less, the dispersibility is dramatically improved and the oxygen gas absorption performance is increased, and the present invention has been completed.

Furthermore, when only a second conductive layer made of carbon powder and glue is formed on the surface of the active material layer, a metal layer is formed at the interface between the active material layer and the second conductive layer during charging. Cadmium is produced.

Therefore, as in the paste-type cadmium electrode for alkaline storage batteries of the third invention, a first conductive layer made of alkali-resistant metal powder and a glue is interposed between the active material layer and the second conductive layer. By bringing the first conductive layer into close contact with the active material layer, the alkali-resistant metal powder is covered with metal cadmium during charging. As a result, it becomes possible to suppress hydrogen gas generation from the alkali-resistant metal powder during charging. In addition, based on the high conductivity of the alkali-resistant metal powder, the production of metal cadmium is promoted, and a significant improvement in oxygen gas absorption performance can be expected.

Incidentally, nickel powder is suitable as the alkali-resistant metal powder in the above-mentioned series.

On the other hand, according to the paste-type cadmium electrode for alkaline storage batteries of the fourth aspect of the present invention, a fibrous nickel body with an average fiber diameter of 1 μm or less and/or a powdered nickel body with an average particle diameter of 1 μm or less is provided on the surface of the cadmium electrode plate. By dispersing the particles, a network of metallic cadmium, which is generated during charging, can be formed on the surface of the electrode plate. As a result, metal cadmium is more likely to form a network on the surface of the electrode plate than when using powder such as carbon powder.
Oxygen gas absorption performance is greatly improved. In addition, the nickel body to be added has an average fiber diameter or/and an average particle diameter of 18 m.
It is extremely small and easily constricts or breaks under small stress. Therefore, the nickel body is
There is no problem of breaking through the separator and causing a short circuit inside the battery.

It should be noted that no problem arises in terms of hydrogen gas generation from the nickel body, since the nickel body is covered with the metal cadmium produced.

The nickel body used here has a certain directionality like fibers due to contact or melting, and has a connected structure, for example, a nickel body manufactured by INC0 with an average fiber diameter of about 0.6 μm and a fiber length. It is preferable to use a nickel body of several μm.

(f) Example Below, the comparison between the present invention and a comparative example will be mentioned and explained in detail.

[First experimental example] 900 g of cadmium oxide powder and 10 g of metal cadmium powder
0 g of active material, 20 g of magnesium oxide as a dendrite inhibitor, 6 g of hydroxypropyl cellulose as a binder, 10 g of nylon m fiber as a reinforcing agent, and 300 cc of a sodium phosphate aqueous solution as a water usage inhibitor. The mixture was kneaded to obtain an active material sheet. The sheet was applied to both surfaces of a conductive core made of punched metal and dried to obtain a cadmium electrode plate, which was used as a base electrode plate.

Next, a predetermined amount of nickel powder having a specific surface area of 5 m'/g by the B, E, T method and acetylene black were mixed, and hydroxypropyl cellulose (IJPC) as a glue was added to obtain a slurry.

This slurry was applied to a base plate using a roller transfer method and dried at 60°C to obtain a cadmium electrode.

The amount of acetylene black added was 0.5% by weight based on the weight of the active material.

Cadmium electrodes were also obtained using nickel powder having a specific surface area of 2 m2/g by the B, E, T method in the same manner as described above.

These cadmium electrodes and a sintered nickel positive electrode plate were rotated through a separator to create a spiral electrode body, and a sealed nickel-cadmium storage battery with a nominal capacity of 1.3 Ah (
SC size) was obtained and the viability of each [SC size] was compared.

(Test 1) Using a battery equipped with the cadmium electrode, the relationship between the total surface area of nickel powder in the conductive layer per unit weight of active material and the equilibrium internal gas pressure of the battery was investigated.

The conditions at this time were 1.3A (IC) at 25°C.
The battery is continuously charged with a current of .

The results are shown in FIG. In FIG. 1, the solid line shows the case where nickel powder with a specific surface area of 5 m 27 g is used, and the chain line shows the case where nickel powder with a specific surface area of 2 m 27 g is used.

From Figure 1, even if the specific surface area is different from 5 m'/g to 2 m'/g, the paper surface area of the nickel powder added is 0.001 m' or more per 1 g of active material. At times, it can be seen that the oxygen gas absorption performance is significantly improved.

(Test 2) Next, in the same manner as described above, using a battery, the relationship between the total surface area of nickel powder in the conductive layer per unit weight of active material and the amount of hydrogen gas generated within the battery was investigated. The conditions at this time are 10'Ci
:It charges to 160% with a current of 2.6A (2C).

The results are shown in FIG. In FIG. 2, the solid line shows the case where nickel powder with a specific surface area of 5 m2/g was used, and the chain line shows the case where nickel powder with a specific surface area of 2 m'/g was used.

From Figure 2, the specific surface area of nickel powder is 5 m'/g.
, 2 m'/g, the total surface area of the added nickel powder is o per 1 g of active material.
, osm'/g, hydrogen gas generation becomes noticeable.

From the results of Test 1 and Test 2, the amount of alkali-resistant metal powder in the guiding layer, that is, the amount of nickel powder added to 1 g of active material, is 001 to 0.05 m in surface area.
It is best to

[Second Experimental Example] Nickel powder of various apparent densities (according to the Shuhoku measuring device) was added to a solution consisting of acetylene black as carbon powder and hydroxypropylcellulose (HI)C as a glue, The mixture was thoroughly stirred and mixed to obtain a slurry. This slurry was applied to the base plate used in the first experimental example using a roller transfer method, and dried at 60°C.
A conductive layer was formed on the surface of the electrode plate. In this way, a cadmium electrode having a conductive layer containing a mixture of carbon powder and alkali-resistant metal powder was obtained.

The amount of acetylene black added was 0.8% by weight in all cases based on the weight of the active material.

In addition, the amount of nickel powder added was determined by using acetylene 1.The cadmium electrode using the nickel powder having various apparent densities obtained in this way was rotated between a sintered nickel positive electrode plate and a spiral electrode. A sealed type Ninkel cadmium storage battery (SC size) with a nominal capacity of 3 Ah was obtained, and its performance was compared.

(Test 3) Using a battery equipped with the cadmium electrode, the relationship between the apparent density of nickel powder in the conductive layer and the equilibrium internal gas pressure of the battery was investigated. The conditions at this time were 1.
It charges continuously with a current of 3A (1.0C).

The results are shown in FIG. From FIG. 3, it is possible to lower the internal pressure of the battery by reducing the apparent density of the added nickel powder to 0.2 g/cc or less.

[Third Experimental Example] A first slurry was obtained by kneading carbonyl nickel powder (particle size 2.5 μm) and HP C as a glue, and the surface of the base electrode plate used in the first experimental example was mixed. Then, the slurry was applied by a roller transfer method and dried at 60°C. In this way, the first conductive layer was formed. Next, acetylene black as carbon powder and 1 as glue
-11) C was kneaded to obtain a second slurry, and applied and dried on the first conductive layer in the same manner as described in mj to form a second conductive layer.

In this way, a cadmium electrode A according to the present invention was obtained. The amount of carbonyl nickel added in the conductive layer is
The amount of carbon powder added is 0.5% by weight based on the weight of the active OI material.

On the other hand, as a first comparative example, a comparative electrode B was prepared in which only the second conductive layer was formed on the base electrode plate. The amount of carbon powder added in this conductive layer is 0.5 based on the weight of the active material.
% by weight.

Next, as a second comparative example, a comparative electrode C was prepared in which only the first conductive layer was formed on the base plate. The amount of nickel powder added in this conductive layer was 0.1% by weight based on the weight of the active material.

Using these electrodes A, B, and C, the first experimental example, the second
A sealed nickel-cadmium storage battery (SC size) with a nominal capacity of 1.3 Ah was obtained in the same manner as in the experimental example, and the respective performances were compared.

(Test 4) Using the battery, the relationship between charging time and battery internal pressure was investigated. The conditions at this time are 1.3A (] at 25℃
C) Continuous charging is performed using the current.

The results are shown in FIG. From this, comparative battery C having a second conductive layer made only of carbonyl nickel,
It can be seen that the battery has an internal pressure as low as that of the battery a of the present invention.

(Test 5) Next, using a battery in the same manner as described above, the partial pressure of hydrogen gas inside the battery was examined after charging for a certain period of time. The conditions at this time were 2 hours of light at 0°C and a current of 1.3A (]C)! (200%
charging).

The results are shown in Table 1.

From the results in Table 1, it can be seen that the invention battery a and the ratio $9. It can be seen that the internal hydrogen gas partial pressure of battery C is lower than that of comparative battery C, and hydrogen gas generation is suppressed.

As described above, from the results of Test 4 and Test 5, the invention battery A
It can be seen that the material has excellent oxygen gas absorption performance and hydrogen gas generation is suppressed. Therefore, the present invention type ff1
As shown in A, the above characteristics are exhibited by forming a first conductive layer containing an alkaline metal powder on the surface of a cadmium electrode plate, and then disposing a second conductive layer containing carbon powder.
Alkaline storage batteries with excellent cycle characteristics can be provided.

[Fourth Example] A nickel body (with an average fiber diameter of 0.6 μm and a fiber length of several μm)
(manufactured by INCO), a paste (HPC), and water were sufficiently stirred to prepare a slurry, and this slurry was applied to the surface of the base plate by a roller transfer method. The amount of nickel added at this time was 00 mg for the SC size electrode plate. In this way, the electrode of the present invention was produced.

As a first comparative example, Ninkel a! with a fiber diameter of 1 μm and a length of 1 mm is used. Comparative electrode E was prepared in the same manner as the electrode of the present invention using fibers.

As a second comparative example, a comparative electrode F was prepared in the same manner as the electrode of the present invention using nickel powder having an average particle size of 25 μm.

Furthermore, as a third comparative example, a comparative electrode G was prepared in the same manner as the electrode of the present invention, except that Niacel powder with an average particle size of 2.5 μm was used and the amount added was 200 mg in the SC size electrode plate. Created.

In addition, as a fourth comparative example, using the base plate as is,
Comparative electrode 1 (closed.

Using the electrodes E, F, G, and H obtained in this way, the nominal capacity was 1.3 in the same manner as in the first to third experimental examples.
A sealed nickel-cadmium storage battery (SC size) of A h was obtained and its performance was compared.

(Testro) Using the batteries d, e, f, g, and h, the relationship between charging time and battery internal pressure was investigated. The conditions at this time are that the battery is 130
After charging for 16 hours at mA (0, I C) and completely discharging at OC, 1. , which performs rapid charging using OC.

The results are shown in FIG. From this, it can be seen that the oxygen gas absorption performance is improved by adding a nickel body (cells d, e, f, and g).

The reason why the initial battery internal pressure of comparative battery g was high is considered to be because the amount of nickel added was large and hydrogen gas was generated.

Here, in the battery d of the present invention, the average fiber diameter of the nickel body to be added is extremely small, 0.6 μm, and is considered to have an excellent oxygen gas absorption effect. In addition, if the average fiber diameter or average particle diameter becomes larger than 1 μm, the flexibility of the nickel body decreases, and there is a possibility that the separator may be damaged and an internal short circuit may occur. The particle size is preferably 1 μm or less.

Note that the average fiber diameter or average particle diameter suitable for the present invention is 1μ.
The nickel bodies with a diameter of 1 μm or less have a fixed directional structure like fibers due to contact or melting, and have a connected structure. Niacel powder or the like having a fiber diameter of 1 μm or less can be used.

Further, in the embodiments of the present invention, a roller transfer method was exemplified as a method for forming the conductive layer, but the method is not limited to this in any way, and it is also possible to use a spray method, a dipping method, etc.

(G) Effects of the Invention According to the present invention, the oxygen gas absorption performance of a paste-type cadmium electrode can be further improved, and its industrial value is extremely large.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the relationship between the surface area of nickel powder to be added and battery internal pressure, Figure 2 is a diagram showing the relationship between the surface area of nickel powder to be added and battery hydrogen partial pressure, and Figure 3 is a diagram showing the relationship between the surface area of nickel powder to be added and battery hydrogen partial pressure. A diagram showing the relationship between the apparent density of nickel powder and the battery internal pressure, and FIGS. 4 and 5 are diagrams showing the relationship between the charging time and the battery internal pressure.

Claims (16)

[Claims] (1) A conductive layer containing a mixture of carbon powder and alkali-resistant metal powder on the surface of an active material layer mainly composed of cadmium oxide applied to a conductive core, wherein the alkali-resistant all-metal powder The surface area of 1g of the active material is
A paste-type cadmium electrode for an alkaline storage battery, characterized in that it has a thickness of 0.001 to 0.05 m^2. (2) The paste-type cadmium electrode for an alkaline storage battery according to claim (1), wherein the alkali-resistant metal powder is nickel powder. (3) Applying an active material containing cadmium oxide as a main component to a conductive core to form an active material layer, and on the surface of the active material layer,
A manufacturing method for disposing a conductive layer in which carbon powder and alkali-resistant metal powder are mixed, the surface area of the alkali-resistant metal powder being equal to 1 g of the active material.
A method for producing a paste-type cadmium electrode for an alkaline storage battery, characterized in that the electrode has a thickness of 0.001 to 0.05 m^2. (4) The method for manufacturing a paste-type cadmium electrode for an alkaline storage battery according to claim (3), characterized in that nickel powder is added as the alkali-resistant metal powder. (5) A conductive layer having a mixture of carbon powder and alkali-resistant all-metal powder on the surface of an active material layer mainly composed of cadmium oxide applied to a conductive core, the conductive layer comprising: Carbon powder, glue, and apparent density 0.2
A paste-type cadmium electrode for an alkaline storage battery, comprising an alkali-resistant metal powder of g/cc or less. (6) The paste-type cadmium electrode for an alkaline storage battery according to claim (5), wherein the alkali-resistant metal powder is nickel powder. (7) Applying an active material containing cadmium oxide as a main component to a conductive core to form an active material layer, and on the surface of the active material layer,
An alkaline storage battery characterized in that a slurry obtained by kneading carbon powder, a glue, and an alkali-resistant metal powder with an apparent density of 0.2 g/cc or less is applied and dried to form a conductive layer. A method for manufacturing paste-type cadmium electrodes for use. (8) The method for producing a paste-type cadmium electrode for an alkaline storage battery according to claim (7), characterized in that nickel powder is added as the alkali-resistant metal powder. (9) A first conductive layer made of alkali-resistant metal powder and glue, and a second conductive layer made of carbon powder and glue, on the surface of the active material layer mainly composed of cadmium oxide applied to the conductive core.
A paste-type cadmium electrode for an alkaline storage battery, characterized in that the first conductive layer is disposed closely to the active material layer. (10) The paste-type cadmium electrode for an alkaline storage battery according to claim 9, wherein the alkali-resistant metal powder is nickel powder. (11) A first slurry made of alkali-resistant metal powder and glue is applied to the surface of the active material layer mainly composed of cadmium oxide applied to the conductive core, and dried to form the first conductive layer. A method for producing a paste-type cadmium electrode for an alkaline storage battery, which comprises, after forming, depositing a second slurry made of carbon powder and paste and drying to form a second conductive layer. (12) The method for producing a paste-type cadmium electrode for an alkaline storage battery according to claim (11), characterized in that nickel powder is added as the alkali-resistant metal powder. (13) Fibrous nickel bodies with an average fiber diameter of 1 μm or less and/or powdered nickel bodies with an average particle diameter of 1 μm or less are applied to the surface of the active material layer mainly composed of cadmium oxide applied to the conductive core. A paste-type cadmium electrode for alkaline storage batteries characterized by being dispersed. (14) The paste-type cadmium electrode for an alkaline storage battery according to claim (13), wherein the nickel body has a particle structure in which particles are connected in a certain direction by contact or by melting. (15) After applying an active material containing cadmium oxide as a main component to a conductive core to form an active material layer, apply a fibrous nickel body with an average fiber diameter of 1 μm or less or/to the surface of the active material layer. and a method for producing a paste-type cadmium electrode for an alkaline storage battery, which comprises dispersing and adding powdered nickel bodies having an average particle size of 1 μm or less. (16) Claim (15) characterized in that the nickel body has a particle structure in which particles are connected in a certain direction by contact or smelting.
The method for manufacturing the paste-type cadmium electrode for alkaline storage batteries described above.