JP3343470B2 - Manufacturing method of alkaline secondary battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an alkaline secondary battery having a paste-type positive electrode containing a positive electrode active material comprising a nickel compound.

[0002]

2. Description of the Related Art An alkaline secondary battery has a structure in which an electrode group and an alkaline electrolyte prepared by interposing a separator between a positive electrode and a negative electrode are housed in a container. Conventionally, a paste-type positive electrode has been used as the positive electrode. The paste-type positive electrode is prepared by adding and mixing a conductive agent, a binder and water to nickel hydroxide particles as an active material to prepare a paste. The paste is mixed with a sponge-like porous metal or a metal fiber mat. It is produced by filling a conductive core having a three-dimensional structure.

[0003] The conductive agent in the paste-type positive electrode is added to the paste to activate nickel hydroxide particles having no conductivity. As the conductive agent, for example, cobalt compounds such as cobalt hydroxide and cobalt monoxide, and metallic cobalt have been known. In particular, it is known that a cobalt compound is an excellent conductive agent for improving the utilization factor of the positive electrode. In this state, the above-mentioned conductive agent comprising cobalt species does not have conductivity, and thus cannot activate the active material. After the secondary battery is assembled from the paste-type positive electrode including the conductive agent, the conductive agent dissolves as a divalent cobalt species in the alkaline electrolyte held by the positive electrode, and the oxywater having high conductivity upon initial charge. By being oxidized to cobalt oxide, it has conductivity. Since the cobalt oxyhydroxide covers the surface of the nickel compound particles, conduction between the nickel compound particles and between the particles and the conductive core are improved, and the utilization rate of the positive electrode is improved.

However, in such a method, it is difficult to uniformly disperse the conductive agent in the paste-type positive electrode, and it is also difficult to dissolve all the conductive agent in the alkaline electrolyte held in the positive electrode. Therefore, the distribution of the cobalt oxyhydroxide film on the surface of the nickel compound particles becomes non-uniform, and it is difficult to sufficiently improve the conduction between the particles and between the particles and the conductive core. As a result, there is a problem in that the utilization rate of the positive electrode decreases, which causes a reduction in battery capacity.

[0005] For this reason, when the utilization rate is improved by increasing the amount of the conductive agent added to the positive electrode, the amount of the active material in the positive electrode is relatively reduced, so that the capacity of the positive electrode is reduced. There is a problem that it causes a decrease. Further, even if the amount of the conductive agent is increased, it is difficult to uniformly disperse the conductive agent in the positive electrode, and thus the utilization rate of such a positive electrode is not always sufficient. Further, since the cobalt species is expensive, increasing the amount of the conductive agent has caused a disadvantage in terms of cost.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for manufacturing an alkaline secondary battery having a high capacity and a high utilization factor by improving the positive electrode.

[0007]

Means for Solving the Problems The method of manufacturing an alkaline secondary battery according to the present invention, comprising a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and an alkaline electrolyte In the method for producing an alkaline secondary battery, 40
Nickel in a furnace maintained at a temperature in the range of ~ 200 ° C
The nickel compound particles while stirring the nickel compound particles.
Spray an alkaline aqueous solution in which divalent cobalt species is dissolved
By this, the surface of the nickel compound particles
Forming a cobalt hydroxide layer, the method comprising the steps of: preparing a paste containing the nickel compound particles, the positive by a method comprising the step of filling the paste to a current collector
It is characterized by producing a pole .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an alkaline secondary battery manufactured by the method according to the present invention will be described with reference to FIG. A positive electrode 2, a separator 3 and a negative electrode 4 are placed in a bottomed cylindrical container 1.
And an electrode group 5 produced by stacking and winding in a spiral shape. The negative electrode 4 is arranged at the outermost periphery of the electrode group 5 and is in electrical contact with the container 1. The alkaline electrolyte is contained in the container 1. A circular sealing plate 7 having a hole 6 in the center is arranged at the upper opening of the container 1. The ring-shaped insulating gasket 8 is disposed between the peripheral edge of the sealing plate 7 and the inner surface of the upper opening of the container 1, and the sealing plate is formed on the container 1 by caulking to reduce the diameter of the upper opening inward. 7 is hermetically fixed via the gasket 8. One end of the positive electrode lead 9 is connected to the positive electrode 2, and the other end is connected to the lower surface of the sealing plate 7. Hat-shaped positive electrode terminal 1
Numeral 0 is mounted on the sealing plate 7 so as to cover the hole 6. A rubber safety valve 11 is disposed so as to close the hole 6 in a space surrounded by the sealing plate 7 and the positive electrode terminal 10. A holding plate 12 made of an insulating material having a hole in the center is arranged on the positive electrode terminal 10 such that a projection of the positive electrode terminal 10 projects from the hole. The outer tube 13 is provided around the periphery of the holding plate 12 and the container 1.
And the periphery of the bottom of the container 1.

Next, the positive electrode 2, the negative electrode 4, the separator 3, and the alkaline electrolyte will be described. 1) Positive electrode 2 This positive electrode 2 can be manufactured by the following method. (First Step) Immediately after spraying an aqueous alkaline solution in which divalent cobalt species is dissolved onto nickel compound particles, the nickel compound particles are dried.

Examples of the nickel compound particles include nickel hydroxide particles, nickel hydroxide particles in which zinc and cobalt are coprecipitated, and nickel oxide particles. Among them, it is preferable to use nickel hydroxide particles in which zinc and cobalt are coprecipitated.

The nickel hydroxide particles have an average particle size of 5 to 3
It is preferable that the thickness is 0 μm, the tap density is 1.8 g / cm ³ or more, and the specific surface area is 8 to 25 m ² / g. The nickel hydroxide particles preferably have a spherical shape or a shape similar thereto.

The aqueous alkaline solution in which the divalent cobalt species is dissolved is prepared by dissolving a cobalt compound or a cobalt source such as metallic cobalt in a heated alkaline aqueous solution. Examples of the divalent cobalt species include blue complex ions (HCoO ₂ ⁻ ).

Examples of the cobalt compound include cobalt hydroxide (Co (OH) ₂ ) and cobalt monoxide (C
oO) and the like. In addition, since metallic cobalt has low solubility in an aqueous alkaline solution, it is preferable to use the above cobalt compound in combination when used as a cobalt seed source.

As the alkaline aqueous solution, for example, an aqueous solution of sodium hydroxide (NaOH), lithium hydroxide (L
and an aqueous solution of potassium hydroxide (KOH). As the alkaline aqueous solution, these types of aqueous solutions may be used alone, but for example, a mixed solution of two or more types of aqueous solutions such as a mixed solution of KOH and LiOH may be used. The alkaline aqueous solution may have a different composition from that of the alkaline electrolyte.

The cobalt concentration of the aqueous alkali solution in which the divalent cobalt species is dissolved is 0.1 to 2.0 in terms of cobalt.
g / l is preferred. This is due to the following reasons. When the concentration is less than 0.1 g / l, the distribution of the divalent cobalt species attached to the surface of the nickel compound particles by spraying becomes sparse, and the cobalt oxyhydroxide film obtained by oxidizing the cobalt species becomes nickel compound particles. Since the particles are scattered on the surface, the conduction of the nickel compound particles may not be sufficiently enhanced. The higher the cobalt concentration of the aqueous solution, the better. Particularly, an alkaline aqueous solution in which divalent cobalt species is dissolved to a saturation concentration (the cobalt concentration of this aqueous solution is 2.0 g / l in terms of cobalt)
It is preferable to use

The solubility of the cobalt seed source increases as the temperature of the aqueous alkaline solution increases. The alkaline aqueous solution is preferably heated to 40 ° C. or higher. A more preferred heating temperature is 80 ° C. or higher. The higher the heating temperature, the better. If the heating temperature is lower than 40 ° C., the solubility of the cobalt seed source in the aqueous alkali solution is reduced, so that it may be difficult to dissolve a sufficient amount of divalent cobalt species in the aqueous alkali solution. The upper limit of the heating temperature is the boiling point of the alkaline aqueous solution.

Further, the solubility of the cobalt seed source increases as the concentration of the aqueous alkali solution increases. It is preferable that the concentration of the alkaline aqueous solution be 1 N or more. A more preferred concentration is 4.0N or more. The higher the concentration of the alkaline aqueous solution, the better. When the concentration of the alkaline aqueous solution is 1
If the content is less than N, the solubility of the cobalt seed source in the aqueous alkali solution decreases, and the concentration of the divalent cobalt seed in the aqueous alkali solution may decrease.

The aqueous alkaline solution in which the divalent cobalt species is dissolved is preferably sprayed onto the nickel compound particles at a high temperature. If the alkaline aqueous solution is cooled and then sprayed, the solubility of the divalent cobalt species may decrease, and the concentration of the divalent cobalt species in the alkaline aqueous solution may decrease. However, when an alkaline aqueous solution in which divalent cobalt species is dissolved to a saturation concentration is used, the solubility is hardly reduced even when cooled, and therefore, spraying may be performed after cooling.

The drying of the nickel compound particles sprayed with the aqueous alkali solution, that is, the chemical oxidation of the divalent cobalt species adhering to the surface of the nickel compound particles to cobalt oxyhydroxide is carried out at 40 ° C. to 200 ° C. ° C
Can be performed by heating in the range described above. If the heating and drying temperature is lower than 40 ° C., it may be difficult to oxidize the divalent cobalt species to cobalt oxyhydroxide. On the other hand, when the heating and drying temperature exceeds 200 ° C., the nickel compound particles may be decomposed. In particular, drying of the nickel compound particles is performed at 60 ° C. for 10 to 60 hours.
It is preferable to carry out by heating for a minute. (Second step) A paste containing the nickel compound particles sprayed and dried with the alkaline aqueous solution, a binder, and water is prepared.

Examples of the binder include polytetrafluoroethylene (PTFE), polyethylene, rubber-based polymers (eg, polypropylene styrene butadiene rubber (SBR) latex, acrylonitrile butadiene rubber (NBR) latex, ethylene propylene diene Hydrophobic polymers such as monomers (EPDM) latex); carboxymethyl cellulose (CMC);
Methylcellulose (MC), hydroxypropylmethylcellulose (HPMC), polyacrylate (eg, sodium polyacrylate (SPA)), polyvinyl alcohol (PVA), polyethylene oxide, copolymer of acrylic acid and vinyl alcohol, acrylate And hydrophilic alcohols, such as copolymers of maleic acid and vinyl alcohol. The binder can be formed from at least one selected from the above-mentioned types of polymers. Among them, it is preferable to use a mixed polymer composed of a hydrophobic polymer and a hydrophilic polymer. The hydrophobic polymer can improve the strength of the positive electrode. On the other hand, the hydrophilic polymer can impart fluidity to the paste. In particular,
Polytetrafluoroethylene as a hydrophobic polymer,
It is more preferable to use a mixed polymer having at least one selected from carboxymethylcellulose, methylcellulose and polyvinyl alcohol as the hydrophilic polymer. The carboxymethyl cellulose,
The methyl cellulose, the polyvinyl alcohol,
It is an excellent paste flow regulator. In addition, the polyethylene, the polypropylene, and the polytetrafluoroethylene can be used in the form of a dispersion. (Third step) The paste is filled in a current collector.

The current collector may be a mesh-like, sponge-like, fiber-like, or felt-like metal porous material made of a metal such as nickel or stainless steel, or an alkali-resistant material such as a nickel-plated resin. And the like.

The current collector filled with the paste is usually dried and then subjected to pressure molding as necessary. 2) Negative Electrode 4 The negative electrode 4 preferably has a structure in which a negative electrode active material is supported on a conductive substrate.

For the negative electrode, for example, a paste containing a negative electrode active material, a binder, a conductive powder, and water is prepared, and the paste is filled in a conductive substrate, dried, and then, if necessary, pressure-molded. It is manufactured by doing.

As the active material, a material directly involved in the charge / discharge reaction or a material directly involved in the charge / discharge reaction can be used.
Emitting substances can be used. Examples of the former include powders of cadmium compounds such as metal cadmium and cadmium hydroxide. Examples of the latter include, for example, a hydrogen storage alloy that stores and releases hydrogen. Above all, a secondary battery provided with a negative electrode containing the hydrogen storage alloy is capable of discharging at a higher current than a secondary battery provided with a negative electrode containing the cadmium compound powder, and has a low risk of environmental pollution. Therefore, it is suitable.

The hydrogen storage alloy is not particularly limited as long as it can store hydrogen electrochemically generated in an electrolytic solution and can easily release the stored hydrogen during discharge. . For example, LaNi ₅ , MmN
i ₅ (Mm; misch metal), LmNi ₅ (Lm; lanthanum-enriched misch metal), or Ni
A part of Al, Mn, Co, Ti, Cu, Zn, Zr,
Examples thereof include a multi-element type substituted by elements such as Cr and B, or a TiNi type, TiFe type, ZrNi type, or MgNi type. Among them, the general formula LmNi
_x Mn _y A _z (However, A is Al, shows at least one metal selected from Co, the atomic ratio x, y, z is the total value of 4.8 ≦ x + y + z ≦ 5.4) hydrogen represented by It is desirable to use an occlusion alloy. Since the negative electrode containing the hydrogen storage alloy having such a composition can suppress the pulverization accompanying the progress of the charge / discharge cycle, the charge / discharge cycle life of the secondary battery can be improved.

As the binder, at least one selected from the same polymers as described for the positive electrode can be used. Examples of the conductive powder include nickel powder, cobalt oxide, titanium oxide, and carbon black. In particular, it is preferable to use the carbon black as the conductive powder.

Examples of the conductive substrate include a two-dimensional substrate such as a punched metal, an expanded metal, a perforated rigid plate, and a nickel net; a three-dimensional substrate such as a felt-like metal porous body or a sponge-like metal substrate. Can be mentioned. 3) Separator 3 As the separator 3, for example, a nonwoven fabric made of a polyolefin fiber, such as a nonwoven fabric made of polyethylene fiber, a nonwoven fabric made of ethylene-vinyl alcohol copolymer fiber, or a nonwoven fabric made of polypropylene fiber, provided with a hydrophilic functional group,
For example, a nonwoven fabric made of polyamide fiber such as nylon 6,6 can be used. Examples of a method for imparting a hydrophilic functional group to the polyolefin fiber nonwoven fabric include a corona discharge treatment, a sulfonation treatment, a graft copolymerization, and the application of a surfactant or a hydrophilic resin. 4) Alkaline Electrolyte Examples of the alkaline electrolyte include an aqueous solution of sodium hydroxide (NaOH) and lithium hydroxide (LiOH).
Aqueous solution, potassium hydroxide (KOH) aqueous solution, NaO
H and LiOH mixed solution, NaOH and KOH mixed solution, K
Mixture of OH and LiOH, KOH, LiOH and NaOH
And the like can be used.

According to the method of manufacturing an alkaline secondary battery of the present invention, the positive electrode is formed by spraying an alkaline aqueous solution in which divalent cobalt species is dissolved onto the nickel compound particles, and immediately drying the nickel compound particles. , A step of preparing a paste containing the nickel compound particles, and a step of filling the current collector with the paste. By the spraying, the divalent cobalt species dissolved in the aqueous alkaline solution can be uniformly attached to the surface of the nickel compound particles. By immediately drying the nickel compound particles and chemically oxidizing the divalent cobalt species, the surface of the nickel compound particles can be covered with a uniform and dense cobalt oxyhydroxide film. As a result, conduction between the nickel compound particles and between the nickel compound particles and the current collector in the positive electrode can be improved, so that the utilization rate of the positive electrode can be improved. According to such a method, a solid cobalt species is added to a paste-type positive electrode, the positive electrode is incorporated into a secondary battery, and the cobalt species is dissolved in an alkaline electrolyte in the positive electrode. By oxidizing the cobalt species at the first charge, a uniform and dense cobalt oxyhydroxide film can be formed with a smaller amount of cobalt species than the conventional method of producing a cobalt oxyhydroxide film. Therefore, the amount of the nickel compound particles added to the positive electrode can be increased, and the capacity can be increased.
Therefore, when the positive electrode is incorporated in an alkaline secondary battery, a high-capacity and long-life alkaline secondary battery can be realized.

[0029]

Embodiments of the present invention will be described below in detail with reference to the drawings. Example A lanthanum-enriched misch metal Lm, Ni, Co,
LmNi _4.0 C by high frequency furnace using Mn and Al
A hydrogen storage alloy having a composition of o _0.4 Mn _0.3 Al _0.3 was produced. The hydrogen storage alloy was mechanically pulverized,
Passed through a 0 mesh sieve. The obtained alloy powder 1
0.5 parts by weight of sodium polyacrylate and 0.12 parts of carboxymethylcellulose (CMC) per 100 parts by weight
5 parts by weight, 1.5 parts by weight of a polytetrafluoroethylene dispersion (specific gravity: 1.5, solids content: 60 wt%) in terms of solids and 1 part by weight of carbon powder as a conductive material are mixed with 50 parts by weight of water. Thus, a paste was prepared. This paste was applied to a punched metal as a conductive substrate, dried, and then subjected to pressure molding to produce a paste size negative electrode for AA size.

3 parts per 90 parts by weight of nickel hydroxide powder
An amount of cobalt hydroxide corresponding to parts by weight was dissolved in an 8N sodium hydroxide solution heated to 100 ° C. to prepare a sodium hydroxide solution in which blue complex ions (HCoO ₂ ⁻ ) were dissolved. The concentration of the blue complex ion in the sodium hydroxide solution was 2.0 g / l in terms of cobalt. The nickel hydroxide powder was accommodated in a furnace at 100 ° C., and the sodium hydroxide solution (temperature was 100 ° C.) was sprayed on the nickel hydroxide powder while stirring the nickel hydroxide powder in the furnace.

With respect to 100 parts by weight of the nickel hydroxide powder after the spraying and drying step, 0.25 parts by weight of carboxymethyl cellulose, 0.25 parts by weight of sodium polyacrylate and a dispersion of polytetrafluoroethylene were used as binders. A paste was prepared by adding and mixing 3 parts by weight of John and 30 parts by weight of water in terms of solid content. Subsequently, the paste was filled in a nickel fiber substrate as a current collector, dried, and pressed to thereby assemble a paste type positive electrode for AA size having a theoretical capacity of about 1100 mAh.

A separator (a nonwoven fabric made of a composite fiber made of a polypropylene fiber and a polyethylene fiber, which has been subjected to a hydrophilic treatment) is interposed between the positive electrode and the negative electrode,
A spirally wound electrode group was produced. This electrode group is AA
It was stored in a bottomed cylindrical container of a size. An alkaline electrolyte comprising potassium hydroxide, sodium hydroxide and lithium hydroxide is accommodated in this container, and the container has a structure shown in FIG. 1 described above by sealing, and is a size AA cylinder having a theoretical capacity of 1100 mAh. A rechargeable alkaline battery was assembled. Comparative Example 1 A cylindrical alkali having a size of AA and a theoretical capacity of 1100 mAh had the structure shown in FIG. 1 described above by the same method as that of the example, except that the positive electrode produced by the method described below was used. The secondary battery was assembled.

1 part by weight of cobalt hydroxide powder was added to 90 parts by weight of nickel hydroxide powder, and a binder (0.25 parts by weight of carboxymethyl cellulose, 0.25 parts by weight of sodium polyacrylate and polytetrafluoroethylene) was used. 3 parts by weight of the dispersion in terms of solid content) and 30 parts of water
A paste was prepared by adding and kneading parts by weight. Subsequently, the paste was filled in a nickel fiber substrate as a current collector, dried, and pressed to thereby assemble a paste type positive electrode for AA size having a theoretical capacity of about 1100 mAh. Comparative Example 2 The structure shown in FIG. 1 was used in the same manner as in Comparative Example 1 except that the addition amount of the cobalt hydroxide powder in the positive electrode was 3 parts by weight.
A 100 mAh cylindrical alkaline secondary battery was assembled. Comparative Example 3 The structure shown in FIG. 1 was used in the same manner as in Comparative Example 1 except that the amount of cobalt hydroxide powder added to the positive electrode was changed to 5 parts by weight.
A 100 mAh cylindrical alkaline secondary battery was assembled. Comparative Example 4 The structure shown in FIG. 1 was used in the same manner as in Comparative Example 1 except that the addition amount of the cobalt hydroxide powder in the positive electrode was changed to 10 parts by weight, and the size was AA size and the theoretical capacity was 1100 mAh. Was assembled.

The secondary batteries of Examples and Comparative Examples 1 to 4 were charged at 0.1 C for 15 hours, and then charged at 1.0 C.
For the first time by discharging to 1.0V.
Such initial charging activated nickel hydroxide in the positive electrode of the example. In Comparative Examples 1 to 4, cobalt hydroxide in the positive electrode was oxidized and nickel hydroxide was activated.

Examples and Comparative Examples 1-4 with Initial Charge
When the surface of each positive electrode was observed by SEM (scanning electron microscope) and EDX (energy dispersive X-ray spectroscopy), the surface of the nickel hydroxide particles in the positive electrode of Example was uniformly coated with cobalt. I confirmed that. In contrast, it was confirmed that cobalt was scattered on the surfaces of the nickel hydroxide particles in the positive electrodes of Comparative Examples 1 to 4 even when the amount of cobalt hydroxide added was large.

Further, voltammogram measurement was performed on the positive electrodes of the examples and comparative examples 1 to 4, and no divalent / trivalent oxidation peak of cobalt was observed in the positive electrodes of the examples. From this, it can be said that all the blue complex ions attached to the nickel hydroxide surface by spraying were oxidized to cobalt oxyhydroxide. On the other hand, Comparative Example 1
In each of the positive electrodes of Nos. 4 to 4, oxidation peaks of divalent / trivalent cobalt were observed, indicating that part of the cobalt hydroxide added to the positive electrode remained without being oxidized.

Further, the obtained secondary batteries of Examples and Comparative Examples 1 to 4 were charged at 0.1 C for 15 hours, and then discharged at 1.0 C to 1 V (initial capacity). Was measured, and the results are shown in Table 1 below. In addition, the initial capacity was set to 100 as the initial capacity in Example 1.

[0038]

[Table 1]

As is clear from Table 1, the second embodiment of the present invention in which a cobalt oxyhydroxide film is formed by spraying an aqueous alkaline solution in which divalent cobalt species are dissolved on the surface of nickel compound particles and immediately drying the surface. It can be seen that the secondary batteries have a higher initial capacity than the secondary batteries of Comparative Examples 1 to 3 in which a cobalt seed source is added in a powder state and a cobalt oxyhydroxide film is formed by initial charging. In addition, the secondary battery of the example is the same as the secondary battery of Comparative Example 4 in which the addition amount of the cobalt hydroxide powder was increased to 10 parts by weight with a small amount of cobalt hydroxide of 3 parts by weight based on 90 parts by weight of the nickel hydroxide powder. It can be seen that a high initial capacity equivalent to that of the secondary battery can be realized.

In the above embodiment, an example in which the present invention is applied to a cylindrical alkaline secondary battery has been described. However, the present invention can be similarly applied to a prismatic alkaline secondary battery. Further, the electrode group housed in the battery container is not limited to the spiral shape, but may be a form in which a plurality of positive electrodes, separators, and negative electrodes are stacked in this order.

[0041]

As described in detail above, according to the method for manufacturing an alkaline secondary battery of the present invention, the utilization rate of the positive electrode can be sufficiently increased with a small amount of cobalt species, and the battery capacity and the charge / discharge cycle life can be improved. , Etc. can be improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an alkaline secondary battery manufactured by a method according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... container, 2 ... positive electrode, 3 ... separator, 4 ... negative electrode, 5 ...
Electrode group, 7 ... sealing plate.

Continuation of front page (72) Inventor Kenichi Kanno 3-4-1-10 Minamishinagawa, Shinagawa-ku, Tokyo Toshiba Battery Corporation (56) References JP-A-3-78965 (JP, A) JP-A-7- 114920 (JP, A) International Publication 93/8611 (WO, A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01M 4/32 H01M 4/52

Claims (1)

(57) [Claims] 1. A method for manufacturing an alkaline secondary battery comprising a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and an alkaline electrolyte, wherein a temperature within a range of 40 to 200 ° C. In a furnace maintained at a temperature
Stirring the nickel compound particles while stirring the nickel compound particles
Jets an alkaline aqueous solution in which divalent cobalt species are dissolved
By atomizing, the surface of the nickel compound particles is
The positive electrode is manufactured by a method including a step of forming a cobalt oxyhydroxide film, a step of preparing a paste containing the nickel compound particles, and a step of filling the paste into a current collector. A method for manufacturing an alkaline secondary battery.