JP3489396B2 - Metal-coated nickel hydroxide for positive electrode material and method for producing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal-coated nickel hydroxide used as a non-sintered nickel positive electrode material for alkaline batteries and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, as electronic devices have become smaller and more portable, alkaline batteries installed therein have been required to be smaller and lighter. Therefore, the capacity of alkaline batteries is rapidly increasing. As one of the technologies for increasing the capacity, a non-sintered nickel positive electrode in which a nickel hydroxide powder as an active material is made into a paste and filled in a porous nickel substrate has been put into practical use. This non-sintered nickel positive electrode can hold nickel hydroxide powder, which is an active material, in the electrode plate at a higher density than the conventional sintered nickel positive electrode.

The conditions required for the characteristics of nickel hydroxide, which is the active material of the non-sintered nickel positive electrode, are (1)
It is mentioned that the tap density is sufficiently high in order to increase the energy density, and (2) the crystallinity is low in order to improve discharge characteristics and life characteristics.

It is partially known that the nickel hydroxide powder satisfying the above conditions and the method for producing the same are as follows (see Japanese Patent Application Laid-Open No. 9-17429, etc.), and the applicant of the present invention is the first. Partially proposed to (Japanese Patent Application No. 9-6
4919).

That is, the nickel hydroxide powder contains at least one selected from the group consisting of cobalt, cadmium and zinc and has a tap density of 2.0 to 2.3 g.
/ Ml, the average particle size is 1 to 30 μm, and the half width of the X-ray diffraction peak of the (101) plane is 0.9 to 1.3 °,
It consists of spherical or ellipsoidal particles. Further, the method for producing the nickel hydroxide powder, an aqueous solution containing nickel,
An aqueous solution containing at least one selected from the group consisting of cobalt, cadmium and zinc, an aqueous alkali hydroxide solution, and aqueous ammonia are continuously and simultaneously supplied to a reaction tank equipped with a stirrer, and (1) the reaction solution Nickel ion concentration in 1 to 50 mg / l, (2) reaction temperature 40 to 70
° C., (3) the ± 1 ° C. The fluctuation range of the reaction temperature, (4) the agitation stirring blades discharge head of agitator 14~70m ² / s ² and (5) retention of in the reaction vessel of the production of nickel hydroxide Time 6
After the reaction, the solid-liquid separation, washing with water and drying are carried out for a period of time or longer.

By the way, as a condition required for the characteristics of nickel hydroxide, which is the active material of the non-sintered nickel positive electrode, the conductivity of the active material is sufficiently high to stabilize the utilization rate of the active material. Are further listed. However,
Since the nickel hydroxide produced as described above has no conductivity, it is possible to make the electrode conductive by mixing a conductive aid such as nickel metal powder or cobalt oxide powder into the nickel hydroxide paste when incorporating it into the electrode. It was charged and discharged.

However, in the method of imparting conductivity as described above, there is a problem that the utilization factor of the battery is lowered and heat is generated due to an increase in internal resistance unless the conductive additive is uniformly dispersed. was there. Further, even if mixed well, there was a problem that the amount of the conductive auxiliary agent added was increased in order to ensure the conductivity between the nickel hydroxide particles, and the capacity of the battery was lowered.

In order to solve the problem of the addition of the conductive additive,
Various methods have been proposed for coating nickel hydroxide with a metal.

For example, there is a method using a hybridization system described in Japanese Patent Publication No. 7-107848, and a method utilizing a mechanochemical reaction described in Japanese Patent Application Laid-Open No. 6-187984. However, since these methods are mechanical methods, the nickel hydroxide particles may be damaged or destroyed. As a result, it has been difficult to maintain the high utilization rate of the positive electrode.

A coating method by electroless plating, which is described in Japanese Patent Application Laid-Open No. 4-359864, has been proposed. However, in this method, the mixing of phosphorus and boron from sodium hypophosphite and sodium borohydride used as a reducing agent is unavoidable, and thus nickel hydroxide produced is not preferable as an active material. .

Further, a method using a complex salt such as acetylacetone cobalt or acetylacetone nickel described in JP-A-9-17428 has been proposed. But,
This method has a problem that the reaction requires a high temperature of about 200 ° C.

[0012]

In view of the above circumstances, the present invention satisfies all the conditions of energy density, discharge characteristics, life characteristics and conductivity, and there is no risk of particles being damaged or broken. An object of the present invention is to provide a metal-coated nickel hydroxide for a positive electrode material, in which undesired active materials are not mixed. Another object of the present invention is to provide a method capable of producing the metal-coated nickel hydroxide for a positive electrode material described above without using a mechanical method or high temperature at the time of metal coating.

[0013]

The metal-coated nickel hydroxide for a positive electrode material of the present invention comprises particles in which the surface of nickel hydroxide particles is coated with cobalt metal or nickel metal, and the content of phosphorus and boron is Also 0.0
It is less than 1% by weight of powder. The tap density is 2.
0 to 2.3 g / ml, average particle size of 1 to 30 μm, and half width of X-ray diffraction peak of (101) plane of 0.9 to 1.
It is 3 °.

The method for producing a metal-coated nickel hydroxide for a positive electrode material of the present invention is a first method for producing a nickel hydroxide powder.
And the second step of coating the surfaces of the powder particles with cobalt metal or nickel metal. In the first step, an aqueous solution containing nickel, an aqueous alkali hydroxide solution, and aqueous ammonia are continuously and simultaneously supplied to a reaction tank equipped with a stirrer, and (1) the nickel ion concentration in the reaction solution is adjusted. 1 to 50 mg / l, (2) reaction temperature 40 to 70 ° C., (3) fluctuation range of the reaction temperature ± 1 ° C.,
(4) The discharge head of the stirring blade of the stirrer is 14 to 70 m.
² / s ² and (5) The reaction time of the produced nickel hydroxide in the reaction vessel is set to 6 hours or more, and after the reaction, solid-liquid separation, water washing and drying are performed. In the second step, first, a palladium catalyst for electroless plating is applied to the surface of the nickel hydroxide powder particles produced in the first step, and then the surface of the particles to which the catalyst is applied is applied. To
When cobalt metal is coated, cobalt metal is coated in an aqueous solution containing a cobalt ammine complex and hydrazine, and when nickel metal is coated, after nickel metal is coated in an aqueous solution containing ammonia water and hydrazine, solid-liquid separation, Wash with water and dry.

[0015]

DETAILED DESCRIPTION OF THE INVENTION

(1) Metal-Coated Nickel Hydroxide for Positive Electrode Material of the Present Invention The metal-coated nickel hydroxide for positive electrode material of the present invention is prepared from particles in which the surface of nickel hydroxide particles used as a core material is coated with cobalt metal or nickel metal. It is a powder. Then, both of the phosphorus and boron contents are powders of less than 0.01% by weight. When the content of phosphorus or boron is 0.01% by weight or more, the metal-coated nickel hydroxide produced is not preferable as an active material.

The metal-coated nickel hydroxide for a positive electrode material of the present invention has a tap density of 2.0 to 2.3 g / ml,
The average particle size is 1 to 30 μm, and the full width at half maximum of the X-ray diffraction peak of the (101) plane is 0.9 to 1.3 °. If the tap density is less than 2.0 g / ml, it is difficult to obtain a positive electrode that is sufficiently filled with the active material, but the upper limit is usually 2.3 g / ml. Further, when the average particle size is less than 1 μm, not only the tap density is low, but also the active material easily falls off from the porous substrate to easily reduce the energy density of the positive electrode.
When it exceeds, the tap density becomes low. In addition, (10
1) When the half width of the X-ray diffraction peak of the plane is less than 0.9 °,
The crystallinity becomes high and the movement of protons necessary for the battery reaction is easily blocked. On the other hand, when the crystallinity exceeds 1.3 °, a low crystallinity is obtained but the tap density becomes low.

It is preferable to appropriately add cobalt, cadmium, zinc or the like to the nickel hydroxide particles used as the coating core material in order to prevent swelling of the electrode and improve the charge / discharge characteristics of the positive electrode material.

(2) Method for producing metal-coated nickel hydroxide for positive electrode material of the present invention The method for producing metal-coated nickel hydroxide for positive electrode material of the present invention comprises a first step of producing nickel hydroxide powder, and The second step of coating the surfaces of the powder particles with cobalt metal or nickel metal.

(A) Step 1 In order to prepare a reaction solution for producing spherical or elliptical spherical nickel hydroxide particles, an aqueous solution containing nickel, an aqueous alkali hydroxide solution, and aqueous ammonia are provided with a stirrer. Simultaneously and continuously supplying to the reaction tank, (1) the nickel ion concentration in the reaction solution is 1 to 50 mg / l, (2) the reaction temperature is 40 to 70 ° C., and (3) the fluctuation range of the reaction temperature is ±. 1
(4) The discharge head of the stirring blade of the stirrer is 14 to 7
The reaction is carried out at 0 m ² / s ² and (5) the residence time of the produced nickel hydroxide in the reaction tank is 6 hours or more. The reason why the above aqueous solution is continuously supplied simultaneously is to facilitate control of the nickel ion concentration in the prepared reaction solution to 1 to 50 mg / l.

Under the above reaction conditions, when the nickel ion concentration is less than 1 mg / l, the tap density is 2.0 g / ml.
When the above nickel hydroxide is difficult to obtain, on the other hand, when it exceeds 50 mg / l, it is difficult to obtain nickel hydroxide having a half-value width of the X-ray diffraction peak of the (101) plane of 0.9 ° or more. Reaction temperature is 4
If the temperature is lower than 0 ° C, the reaction rate is slow, and it becomes difficult to obtain spherical or elliptic spherical particles. On the other hand, if the temperature is higher than 70 ° C, the reaction rate becomes fast, but equipment such as heating and heat retention and a large amount of energy are required, which is not suitable It is an economy. Further, when the fluctuation range of the reaction temperature exceeds ± 1 ° C, the reaction rate also fluctuates accordingly,
It is difficult to obtain spherical or ellipsoidal particles. Further, when the discharge head of the stirring blade is less than 15 m ² / s ^2, it is difficult to obtain spherical or elliptic spherical particles and the tap density does not increase sufficiently, while when it exceeds 30 m ² / s ² , abrasion of the particles occurs. It will be easier. The ejection head is defined by the formula (I) (Equation 1). In the formula (I), H is the ejection head (m ² /
s ² ), N _p is the stirring power number, N _q is the discharge flow rate number, D _i is the diameter (m) of the stirring blade of the stirrer, n is the rotation speed (1 / s), and the discharge flow rate number N _q is It is obtained from the formula (II) (Equation 2). In the formula (II), Q is the discharge flow rate (m ³ / s). When the residence time of the produced nickel hydroxide in the reaction tank is less than 6 hours, it is difficult to obtain spherical or ellipsoidal particles, and the tap density does not increase sufficiently. On the other hand, the upper limit of the residence time is that the productivity decreases. It will be 20 hours that will become noticeable.

[0021]

[Equation 1] H = (N _p / N _q ) · D _i ² · n ² (I)

[0022]

[Equation 2] Q = N _q · D _i ³ · n (II)

In order to appropriately add cobalt, cadmium, zinc, etc. to the nickel hydroxide particles used as the above-mentioned core material, at least one selected from the group consisting of cobalt, cadmium and zinc is added to the aqueous solution supplied to the reaction tank. Should be further included.

(B) Second Step In the second step of coating the surface of the nickel hydroxide powder particles with cobalt metal or nickel metal, a palladium catalyst for electroless plating is applied as a pretreatment.

(B-1) Pretreatment In the pretreatment, a palladium catalyst is applied by a commercially available alkali ion catalyst for electroless plating.
This is a step necessary for inducing reduction with hydrazine and precipitating cobalt metal or nickel metal on the surface of the nickel hydroxide particles.

(B-2) Metal coating The tap density, the average particle size and the half-value width of the X-ray diffraction peak of the (101) plane of the metal-coated nickel hydroxide powder are such that the coating core is coated. Of each of the nickel hydroxide powders made from the material are within the above ranges. Therefore, the tap density of the metal-coated nickel hydroxide powder, the average particle size, and the half width of the X-ray diffraction peak of the (101) plane are
If the coating is applied to substantially the same extent as those of the nickel hydroxide powder consisting of the coated core material (in other words, to the extent that each of them is maintained in the nickel hydroxide powder consisting of the coated core material), production The obtained metal-coated nickel hydroxide powder can be sufficiently used as a battery positive electrode material.

(B) Cobalt metal coating In the step of cobalt metal coating, nickel hydroxide pretreated with an ammine complex of cobalt complexed with ammonia water which is a complexing agent, hydrazine which is a reducing agent, and water. The powder is slurried at room temperature and heated with stirring. At this time, since nickel hydroxide, which is the coating core material, can be complexed with the ammonia water, the ammonia water may be the minimum amount necessary for complexing cobalt.

During the reduction with hydrazine, the nickel catalyst to be coated is provided with a palladium catalyst, and cobalt is in a complexed state in the liquid, so that solid nickel hydroxide is complexed and reduced. As soon as possible, cobalt is reduced (selectively reduced) and coated on the nickel hydroxide surface. This starts from about 40 ° C., but in order to coat the cobalt metal uniformly, it is preferable to raise the coating temperature to within the range of 45 to 55 ° C. where the reduction reaction is relatively gentle and maintain that temperature.

The coating amount of the cobalt metal can be adjusted by the amount of the cobalt ammine complex added while keeping the coating time constant.

Since the above-mentioned coating method is not a mechanical method but a chemical method, there is no risk of particles being damaged or broken. Further, since sodium hypophosphite or sodium borohydride is not used as a reducing agent, the content of phosphorus and boron, which are unavoidable impurities, is 0.01% by weight.
Less than cobalt metal coated nickel hydroxide is obtained.
Further, unlike the method using a complex salt such as acetylacetone cobalt or acetylacetone nickel, the coating temperature is as low as 45 to 55 ° C.

(B) Nickel metal coating At the stage of nickel metal coating, nickel hydroxide powder pretreated with ammonia water as a complexing agent, hydrazine as a reducing agent, and water is slurried at room temperature and stirred. , Raise the temperature. The nickel to be reduced / coated is supplied as an ammine complex of nickel by the reaction between slurry nickel hydroxide and aqueous ammonia, and therefore it is not necessary to add a nickel ammine complex separately. The reduction / coating reaction starts at about 40 ° C.

In the present invention, in order to uniformly coat the nickel metal, like the coating of the cobalt metal, it is carried out within the range of 45 to 55 ° C. at which the reduction reaction is relatively gentle.

The coating amount of nickel metal can be adjusted by adjusting the amount of nickel hydroxide complexed with ammonia water, specifically, the amount of ammonia water added, the slurry heating time, the coating temperature holding time, and the like. it can.

As in the case of the cobalt metal coating, the above-mentioned coating does not damage or destroy the particles, and the content of phosphorus and boron as unavoidable impurities is 0.0.
Less than 1% by weight of nickel metal coated nickel hydroxide,
It can be manufactured at low temperatures.

[0035]

EXAMPLES Examples of the present invention will be described below.

Example 1 Nickel hydroxide powder consisting of spherical particles was continuously produced using an aqueous solution of nickel sulfate, an aqueous solution of sodium hydroxide, and aqueous ammonia while vigorous stirring. The reaction conditions at this time were as follows (Table 1).

[0037]

[Table 1]

The prepared nickel hydroxide powder contains 60.3% by weight of nickel and 0.5% by weight of cobalt, has a tap density of 2.1 g / ml and an average particle size of 10.3.
μm, and the half width of the X-ray diffraction peak of the (101) plane was 1.046 °.

In order to coat the cobalt metal by using the above-mentioned nickel hydroxide powder particles as the coated core material, first, as a pretreatment, a palladium catalyst for electroless plating was applied. Palladium catalysts for electroless plating are alkali ion catalysts (producer (product name: opc-50) manufactured by Okuno Chemical Co., Ltd.) and crystallizer (product name: opc).
c-150)) was used.

Next, 100 g of the nickel hydroxide powder provided with the palladium catalyst for electroless plating was slurried at room temperature with 10 ml of an aqueous cobalt sulfate solution (Co: 100 g / l), 14 ml of ammonia water, 15 ml of hydrazine and 200 ml of water, The temperature was raised with stirring. Discoloration of the slurry started at 40 ° C., and the temperature was stopped at 50 ° C. (temperature rising time: 4 minutes), and 50 ° C. was maintained for 10 minutes. Then, it was washed with water, filtered and dried to obtain cobalt metal-coated nickel hydroxide. The obtained cobalt metal-coated nickel hydroxide is
59.4% by weight of nickel and 1.6% by weight of cobalt
(Cobalt metal coating content: 1.1% by weight), phosphorus was <0.01% by weight, and boron was also <0.01% by weight. The tap density of this nickel hydroxide is 2.1 g / ml, the average particle size is 10.5 μm, and (1
The half width of the X-ray diffraction peak of the (01) plane was 1.046 °. Furthermore, as a result of qualitative analysis by X-ray diffraction, both a nickel hydroxide peak and a cobalt metal peak were found. As a result of EPMA surface analysis, it was confirmed that the nickel hydroxide surface was coated with cobalt metal.

[Example 2] 50 ml of an aqueous cobalt sulfate solution (C
o: 100 g / l) 50 ml, ammonia water 70 m
The same operation as in Example 1 was performed except that 1 was used. As with Example 1, the slurry started to change color at 40 ° C.

The produced cobalt metal-coated nickel hydroxide contains 55.7% by weight of nickel and 5.7% of cobalt.
% By weight (cobalt metal coating: 5.2% by weight), phosphorus <0.01% by weight, boron <0.01%
% By weight. The tap density of this nickel hydroxide was 2.1 g / ml, the average particle size was 11.8 μm, and the half width of the X-ray diffraction peak of the (101) plane was 1.046 °.
Met. Furthermore, as a result of qualitative analysis by X-ray diffraction, both a nickel hydroxide peak and a cobalt metal peak were found. Compared to the 1.1 wt% cobalt coated article produced in Example 1, 5.2 wt% produced in Example 2
The cobalt-coated product had a strong peak of cobalt metal. As a result of EPMA surface analysis, it was confirmed that the nickel hydroxide surface was coated with cobalt metal.

[Example 3] The same operation as in Example 1 was carried out except that 100 g of nickel hydroxide provided with a palladium catalyst for electroless plating was slurried with 30 ml of ammonia water, 15 ml of hydrazine and 200 ml of water at room temperature. It was As with Example 1, the slurry started to change color at 40 ° C.

The produced nickel metal-coated nickel hydroxide contains 61.4% by weight of nickel (nickel metal coating: 1.1% by weight), 0.5% by weight of cobalt, and phosphorus is <0. 0.01% by weight, boron <0.01
% By weight. Further, the tap density of this nickel hydroxide is 2.1 g / ml, the average particle size is 10.1 μm, and the half width of the X-ray diffraction peak of the (101) plane is 1.046 °.
Met. Further, as a result of qualitative analysis by X-ray diffraction, both a nickel hydroxide peak and a nickel metal peak were found. As a result of EPMA surface analysis, it was confirmed that the nickel hydroxide surface was coated with nickel metal.

[Example 4] The same operation as in Example 3 was carried out except that the temperature was kept at 50 ° C for 20 minutes when the nickel metal was coated. The produced nickel metal-coated nickel hydroxide contains 63.3% by weight of nickel (nickel metal coating: 3.0% by weight), 0.5% by weight of cobalt, and phosphorus is <0.01% by weight. %, Boron is also <0.
It was 01% by weight. The tap density of this nickel hydroxide was 2.1 g / ml, the average particle size was 10.2 μm, and the half width of the X-ray diffraction peak of the (101) plane was 1.04.
It was 6 °. Further, as a result of qualitative analysis by X-ray diffraction, both a nickel hydroxide peak and a nickel metal peak were found. Compared to the 1.1 wt% nickel coated article produced in Example 3, 3.0 produced in Example 4
The peak of nickel metal was strongly observed in the weight% nickel coated product. As a result of EPMA surface analysis, it was confirmed that the nickel hydroxide surface was coated with nickel metal.

Example 5 Example 4 was repeated except that 80 ml of ammonia water was used for coating nickel metal.
The same operation was performed. The produced nickel metal-coated nickel hydroxide contains nickel 68.3% by weight (nickel metal coating content: 8.0% by weight), cobalt 0.5% by weight, and phosphorus <0.01% by weight. %, Boron was also <0.01 wt%. The nickel hydroxide has a tap density of 2.1 g / ml and an average particle size of 10.
The half width of the X-ray diffraction peak of 4 μm and the (101) plane was 1.046 °. Further, as a result of qualitative analysis by X-ray diffraction, both a nickel hydroxide peak and a nickel metal peak were found. 1.1 prepared in Example 3
Compared to the wt% nickel-coated product, the 8.0 wt% nickel-coated product produced in Example 5 showed a strong peak of nickel metal. And, as a result of the EPMA surface analysis,
It was confirmed that nickel metal was coated on the surface of nickel hydroxide.

[0047]

INDUSTRIAL APPLICABILITY The metal-coated nickel hydroxide for a positive electrode material of the present invention satisfies all the conditions of energy density, discharge characteristics, life characteristics and conductivity, and has no risk of particles being damaged or broken. This is one in which undesired active materials are prevented from being mixed. Moreover, the metal-coated nickel hydroxide for a positive electrode material can be produced at a low temperature by the method for producing a metal-coated nickel hydroxide for a positive electrode material of the present invention.

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Claims (11)

(57) [Claims] 1. A powder comprising nickel hydroxide particles whose surface is coated with nickel metal, wherein the content of phosphorus and boron is less than 0.01% by weight, and the tap density is 2.0 to. 2.3 g / ml, average particle size 1-3
0 μm, and the non-sintering type nickel of an alkaline battery having a half width of X-ray diffraction peak of (101) plane of 0.9 to 1.3 °.
Kel metal-coated nickel hydroxide for positive electrode materials. 2. The non-sintered nickel positive electrode for an alkaline battery according to claim 1, wherein the nickel hydroxide particles having a surface coated with nickel metal include at least one selected from the group consisting of cobalt, cadmium and zinc. Metal-coated nickel hydroxide for materials. 3. A nickel hydroxide powder comprising a first step and a second step of coating the surface of the powder particles with cobalt metal, wherein the first step comprises an aqueous solution containing nickel. An alkaline hydroxide aqueous solution and aqueous ammonia are simultaneously and continuously supplied to a reaction tank equipped with a stirrer, and (1) the nickel ion concentration in the reaction solution is 1 to 50 m.
g / l, (2) reaction temperature is 40 to 70 ° C., (3) fluctuation range of the reaction temperature is ± 1 ° C., (4) discharge head of stirring blade of the stirrer is 14 to 70 m ² / s ² and ( 5) The residence time of the produced nickel hydroxide in the reaction tank is 6 hours or more,
After the reaction, solid-liquid separation, washing with water and drying are carried out. In the second step, first, a palladium catalyst for electroless plating is applied to the surface of the powder particles produced in the first step, and then, For a non-sintered nickel positive electrode material for an alkaline battery in which solid-liquid separation, water washing and drying are performed after coating the surface of the catalyst-added particles with cobalt metal in an aqueous solution containing a cobalt ammine complex and hydrazine at 45 to 55 ° C Method for producing metal-coated nickel hydroxide. 4. A first step of producing nickel hydroxide powder, and a second step of coating the surfaces of the powder particles with nickel metal, wherein in the first step, an aqueous solution containing nickel, An alkaline hydroxide aqueous solution and aqueous ammonia are simultaneously and continuously supplied to a reaction tank equipped with a stirrer, and (1) the nickel ion concentration in the reaction solution is 1 to 50 m.
g / l, (2) reaction temperature is 40 to 70 ° C., (3) fluctuation range of the reaction temperature is ± 1 ° C., (4) discharge head of stirring blade of the stirrer is 14 to 70 m ² / s ² and ( 5) The residence time of the produced nickel hydroxide in the reaction tank is 6 hours or more,
After the reaction, solid-liquid separation, washing with water and drying are carried out. In the second step, first, a palladium catalyst for electroless plating is applied to the surface of the powder particles produced in the first step, and then, An alkaline battery in which nickel-metal is coated on the surface of the catalyst-added particles in an aqueous solution containing ammonia water and hydrazine, and then solid-liquid separation, water washing and drying are performed.
For producing a metal-coated nickel hydroxide for a non-sintered nickel positive electrode material. 5. The alkaline battery according to claim 3, wherein the aqueous solution continuously supplied to the reaction tank at the same time further comprises an aqueous solution containing at least one selected from the group consisting of cobalt, cadmium and zinc. Sintered nickel <br /> Method for producing metal-coated nickel hydroxide for positive electrode material. 6. The metal coating has a coating temperature of 45 to 55.
The non-sintering type of the alkaline battery according to claim 4, which is performed at a temperature of ℃
Method for producing metal-coated nickel hydroxide for nickel positive electrode material. 7. A cobalt metal coverages, alk according to claim 3, adjusted by the amount of the cobalt ammine complex
Method for producing metal-coated nickel hydroxide for non-sintered nickel positive electrode material of rechargeable battery . 8. The unburned alkaline battery according to claim 4, wherein the coating amount of nickel metal is adjusted by the addition amount of ammonia water, the coating temperature, the temperature rising time to the coating temperature, or the coating temperature holding time. Method for producing metal-coated nickel hydroxide for a bonded nickel positive electrode material. 9. A tap density of 2.0 to 2.3 g / ml,
A palladium catalyst for electroless plating is applied to the surface of nickel hydroxide powder particles having an average particle size of 1 to 30 μm and a half width of the X-ray diffraction peak of (101) plane of 0.9 to 1.3 °. and then at 45 to 55 in an aqueous solution of ℃ containing cobalt ammine complex and hydrazine, after coating the cobalt metal on the surface of the catalyst imparting particles, solid-liquid separation, non-sintered alkaline cells performing washing and drying Method for producing metal-coated nickel hydroxide for nickel positive electrode material. 10. The tap density is 2.0 to 2.3 g / m.
1, the average particle size is 1 to 30 μm, and X of the (101) plane
The palladium catalyst for electroless plating was applied to the surface of the nickel hydroxide powder particles having a half-value width of the line diffraction peak of 0.9 to 1.3 °, and then, in an aqueous solution containing aqueous ammonia and hydrazine, after coating the nickel metal to the surface of the catalyst imparting particles, solid-liquid separation, alk performing washing and drying
Method for producing metal-coated nickel hydroxide for non-sintered nickel positive electrode material of rechargeable battery . 11. The metal-coated nickel hydroxide produced has a tap density, an average particle diameter, and a half-value width of an X-ray diffraction peak of a (101) plane which are the same as those of the nickel hydroxide powder produced in the first step. The non-sintering of the alkaline battery according to any one of claims 3 to 10, which are substantially the same as
Method for producing metal-coated nickel hydroxide for a positive nickel material.