Alkaline battery

Abstract

To provide an alkaline battery capable of improving the zinc utilization rate and performance.SOLUTION: An alkaline battery 1 includes a cylindrical positive electrode can 2, a cylindrical positive electrode mixture 3 arranged coaxially with the positive electrode can 2 and inside the positive electrode can 2, a cylindrical separator 7 arranged along the inner surface of the positive electrode mixture 3, and a negative electrode mixture 5 filled inside the separator 7 and containing zinc powder 40, and the content of zinc powder 40 in the outer region R1 of the negative electrode mixture 5 is greater than the content of zinc powder 40 in the inner region R2.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] Embodiments of the present invention relate to alkaline batteries.

Background Art

[0002] An alkaline battery includes a cylindrical positive electrode can. Inside the positive electrode can, a positive electrode mixture formed in a cylindrical shape coaxial with the positive electrode can is provided. Inside the positive electrode mixture, a cylindrical separator along the inner peripheral surface of the positive electrode mixture is provided. Inside the separator, a negative electrode is provided. In an alkaline battery, zinc is reacted at the negative electrode to generate a voltage.

[0003] Patent Document 1 discloses an alkaline battery in which a negative electrode is composed of a skeleton portion formed of a zinc porous body and a gel-like negative electrode agent filled therein. The negative electrode mixture contains zinc powder. The alkaline battery generates a voltage by the reaction of zinc. In order to improve the reactivity of zinc and improve the discharge performance, in the configuration disclosed in Patent Document 1, a structure in which the pores of the skeleton portion formed of a zinc porous body are filled with a gel is provided as the negative electrode.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, although the zinc porous body has good conductivity, it is covered with a zinc oxide film and is easily passivated, and the utilization rate of zinc is not sufficient.

[0006] An object of the disclosed technology is to provide an alkaline battery capable of improving the utilization rate of zinc and improving performance.

Means for Solving the Problems

[0007] An alkaline battery according to one aspect of the present disclosure includes a cylindrical positive electrode can, a cylindrical positive electrode mixture provided coaxially with the positive electrode can and inside the positive electrode can, a cylindrical separator provided along the inner peripheral surface of the positive electrode mixture, and a negative electrode mixture filled inside the separator and containing zinc powder. The content rate of zinc powder in the outer region of the negative electrode mixture is higher than the content rate of zinc powder in the inner region.

Advantages of the Invention

[0008] According to one aspect of the alkaline battery disclosed in the present application, it is possible to provide an alkaline battery that can improve the utilization rate of zinc and improve performance.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0010] Hereinafter, embodiments of the alkaline battery disclosed in the present application will be described in detail with reference to the drawings. Note that the alkaline battery disclosed in the present application is not limited by the following embodiments.

[0011] (Embodiment 1) <Schematic Configuration of Alkaline Battery> FIG. 1 is a cross-sectional view of the alkaline battery of Embodiment 1. The alkaline battery 1 of Embodiment 1 includes a positive electrode can 2, a positive electrode mixture 3, a separator 7, a negative electrode mixture 5, a current collecting rod 6, a gasket 14, and a negative electrode terminal plate 12.

[0012] The positive electrode can 2 is formed of a conductor exemplified by a metal. The positive electrode can 2 includes a cylindrical portion 15 and a bottom portion 16. The cylindrical portion 15 is formed in a cylindrical shape. The bottom portion 16 is integrally formed with the cylindrical portion 15 so as to close one end side of the cylindrical portion 15. A positive electrode terminal 17 is formed at the center of the bottom portion 16. The positive electrode terminal 17 is formed so as to protrude from the inside to the outside of the positive electrode can 2. The other end side of the positive electrode can 2 is an opening 18.

[0013] The positive electrode mixture 3 contains manganese dioxide MnO2, graphite C, an aqueous potassium hydroxide solution, and a binder. The binder contains, for example, a polymer compound and adheres powders formed of manganese dioxide MnO2 and graphite C to each other to form a solid. The positive electrode mixture 3 is formed in a cylindrical shape. The positive electrode mixture 3 is provided coaxially with the cylindrical portion 15 of the positive electrode can 2 inside the positive electrode can 2. The positive electrode mixture 3 is arranged such that its outer surface faces the inner peripheral surface of the cylindrical portion 15 of the positive electrode can 2. The positive electrode mixture 3 is in close contact with the positive electrode can 2 so that manganese dioxide MnO2 and graphite C are electrically connected to the positive electrode can 2.

[0014] The separator 7 is formed of an insulator exemplified by vinylon, pulp, or the like. The separator 7 includes a cylindrical portion 21 and a bottom portion 22. The cylindrical portion 21 is formed in a cylindrical shape. The bottom portion 22 closes one end side of the cylindrical portion 21.

[0015] The separator 7 is provided inside the positive electrode can 2. The separator 7 is provided such that the cylindrical portion 21 runs along the inner peripheral surface of the positive electrode mixture 3. The bottom portion 22 of the separator 7 is in contact with the bottom portion 16 of the positive electrode can 2.

[0016] The negative electrode mixture 5 is formed of zinc, an aqueous potassium hydroxide solution, and a gelling agent and is in a gel state. The negative electrode mixture 5 is filled inside the separator 7. The negative electrode mixture 5 contains zinc powder 40.

[0017] Between the positive electrode mixture 3 and the negative electrode mixture 5, there is a cylindrical portion 21 of the separator 7. That is, inside the positive electrode can 2, the positive electrode mixture 3 is provided outside the separator 7, and the negative electrode mixture 5 is provided inside the separator 7. The negative electrode mixture 5 is insulated from the positive electrode mixture 3 and the positive electrode can 2 by the separator 7.

[0018] The current collector rod 6 is formed of a conductor and is formed in a rod shape. The current collector rod 6 is inserted into the negative electrode mixture 5 from the opening 18 side along the central axis 19 of the cylindrical portion 15 of the positive electrode can 2. Note that the central axis 19 of the cylindrical portion 15 of the positive electrode can 2 is also simply referred to as the central axis 19 of the positive electrode can 2.

[0019] An electrolytic solution is injected into the positive electrode can 2. The electrolytic solution is formed from an aqueous solution containing potassium hydroxide. The electrolytic solution penetrates into the positive electrode mixture 3, the negative electrode mixture 5, and the separator 7.

[0020] The gasket 14 is formed of a resin which is an insulator, for example. Nylon is exemplified as the resin used for the gasket 14. The gasket 14 closes the opening 18 of the positive electrode can 2. Further, the gasket 14 supports the current collector rod 6 inserted into the negative electrode mixture 5.

[0021] The negative electrode terminal plate 12 is formed of a conductor exemplified by a metal. The negative electrode terminal plate 12 is provided at the opening 18 portion of the positive electrode can 2. More specifically, the negative electrode terminal plate 12 is provided on the opposite side of the negative electrode mixture 5 with the gasket 14 interposed therebetween. A certain region from the portion overlapping the central axis 19 of the positive electrode can 2 to the outer periphery of the negative electrode terminal plate 12 becomes the negative electrode terminal 13. One end of the current collector rod 6 is joined to the negative electrode terminal plate 12.

[0022] <Regarding the content rate of zinc powder contained in the negative electrode mixture> In the negative electrode mixture 5, the content rate of zinc powder 40 is different between the outer region R1 and the inner region R2. Specifically, the content rate of zinc powder 40 is larger in the outer region R1 than in the inner region R2. Here, the outer region R1 and the inner region R2 are regions defined by virtually dividing the negative electrode mixture 5 into two along the radial direction centered on the central axis 19 of the positive electrode can 2. Among the two divided regions, the outer region becomes the outer region R1, and the region closer to the central axis 19 and inside thereof becomes the inner region R2. The boundary between the outer region R1 and the inner region R2 is set at a position where the weight of the negative electrode mixture 5 in the outer region R1 portion and the weight of the negative electrode mixture 5 in the inner region R2 portion are substantially equal. Note that the boundary between the outer region R1 and the inner region R2 may be set at a position that is half of the inner diameter of the cylindrical portion 21 of the separator 7.

[0023] <Battery Evaluation Test> The evaluation test of the above-described alkaline battery 1 was conducted. FIG. 2 is a diagram showing the results of the evaluation test of the alkaline battery. In the evaluation test, as batteries having the configuration of the alkaline battery 1 of Embodiment 1, batteries of Examples 1 to 11 having the configuration of the alkaline battery 1 with a battery size of LR6 of a AA-size battery were prepared. Further, alkaline batteries of Comparative Examples 1 to 7 were prepared for comparison with a battery size of LR6 of a AA-size battery. For each of the alkaline batteries of Examples 1 to 11 and Comparative Examples 1 to 7, the following two types of discharge tests were conducted as evaluation tests.

[0024] As the first discharge test, a so-called JIS digital still camera mode test was conducted in which it was turned on at 1500 mW for 2 seconds and turned on at 650 mW for 28 seconds, repeated for 5 minutes, and then turned off for 55 minutes with a cut-off voltage of 1.05 V. In the following description, this discharge test is also simply referred to as a 1500W test. The results of the 1500W test are described in the column of "1500W" in FIG. 2.

[0025] As the second discharge test, continuous discharge at 3.9 Ω was performed with a cut-off voltage of 0.8 V. In the following description, this discharge test is also simply referred to as a 3.9Ω test. The results of the 3.9Ω test are described in the column of "3.9Ω" in FIG. 2.

[0026] The numerical values of the test results in FIG. 2 are described as relative values when the duration of Comparative Example 2 is set to 100. Also, the content rate of zinc powder 40 is indicated by the zinc content rate (wt%). The zinc content rate (wt%) is the ratio of the weight of zinc powder 40 contained in the outer region R1 to the total weight (total amount of R1) of the electrolytic solution, gelling agent, and zinc powder contained in the outer region R1 if it is the zinc content rate of the outer region R1. If it is the zinc content rate of the inner region R2, it is the ratio of the weight of zinc powder 40 contained in the inner region R2 to the total weight (total amount of R2) of the electrolytic solution, gelling agent, and zinc powder contained in the inner region R2.

[0027] Also, the particle size of zinc powder 40 is indicated by the zinc powder particle size ratio (W1 / W2). Here, W1 is the weight of zinc powder 40 having a particle size of 150 μm or more among the zinc powder 40 contained in the outer region R1 or the inner region R2. Also, W2 is the weight of zinc powder 40 having a particle size of 75 μm or less among the zinc powder 40 contained in the outer region R1 or the inner region R2. Therefore, the larger the zinc powder particle size ratio (W1 / W2), the more zinc powder 40 with a large particle size is contained in the region. Also, when comparing the zinc powder particle size ratio of the outer region R1 and the zinc powder particle size ratio of the inner region R2, it shows that the region with the larger value contains more zinc powder with a large particle size.

[0028] In Comparative Examples 1 to 7, the zinc content rate and the zinc powder particle size ratio are made equal between the outer region R1 and the inner region R2. In Comparative Examples 1 to 4, the zinc powder particle size ratio is fixed at 1.0, and the zinc content rate is varied. In Comparative Examples 5 to 7, the zinc content rate is fixed at 64, and the zinc powder particle size ratio is varied. Note that in Comparative Examples 4 and 6, the fluidity of the negative electrode mixture decreased, and it was difficult to fill the inside of the separator 7 with a specified amount, so the test results are not described.

[0029] In Examples 1 to 10, the zinc content rate in the outer region R1 is made larger than the zinc content rate in the inner region R2. Also, the zinc powder particle size ratio in the outer region R1 is made larger than the zinc powder particle size ratio in the inner region R2.

[0030] Moreover, in Examples 1 to 4, while fixing the zinc content rate and the zinc powder particle size ratio in the inner region R2, the zinc content rate and the zinc powder particle size ratio in the outer region R1 are made different. Specifically, the zinc content rate in the inner region R2 is fixed at 60, and the zinc powder particle size ratio is fixed at 0.7.

[0031]

[0031] Also, in Examples 5 to 10, while fixing the zinc content rate and the zinc powder particle size ratio in the outer region R1, the zinc content rate and the zinc powder particle size ratio in the inner region R2 are made different. Specifically, the zinc content rate in the outer region R1 is fixed at 68, and the zinc powder particle size ratio is fixed at 1.5.

[0032] As described above, in Examples 1 to 10, the zinc powder particle size ratio in the outer region R1 is larger than the zinc powder particle size ratio in the inner region R2. However, in Example 11, after making the zinc powder particle size ratios in the outer region R1 and the inner region R2 equal, the zinc content rate in the outer region R1 is made larger than the zinc content rate in the inner region R2.

[0033] As described above, in Examples 1 to 10, the zinc content rate in the outer region R1 is larger than the zinc content rate in the inner region R2. However, in Example 11, while making the zinc content rate in the outer region R1 larger than the zinc content rate in the inner region R2, the zinc powder particle size ratio in the outer region R1 and the zinc powder particle size ratio in the inner region R2 are made equal.

[0034] From the test results of Examples 1 to 10, it can be seen that by making the zinc content rate and the zinc powder particle size in the outer region R1 larger than those in the inner region R2, the duration is extended compared to Comparative Examples 1 to 7, and the performance of the alkaline battery 1 is improved.

[0035] In particular, in Examples 2 to 4 and Examples 7 to 9, in both the test results of the 1500W test and the test results of the 3.9Ω test, the duration is longer than that of any of Comparative Examples 1 to 7, indicating that the performance of the alkaline battery 1 has been further improved.

[0036] Therefore, it is preferable that the zinc content in the outer region R1 is 65 to 70 wt%, and the zinc content in the inner region R2 is 58 to 63 wt%.

[0037] Also, for the zinc powder particle size ratio W1 / W2, it is preferably 1 ≦ W1 / W2 ≦ 2 in the outer region R1, and 0.5 ≦ W1 / W2 ≦ 1 in the inner region R2.

[0038] In addition, in Example 11, even when the zinc powder particle size ratios in the outer region R1 and the inner region R2 are made equal, by making the zinc content in the outer region R1 larger than the zinc content in the inner region R2, the duration is longer than that of Comparative Examples 1 to 7, indicating that the performance of the alkaline battery 1 has been improved.

[0039] As described above, the following reasons can be considered for the improvement in the performance of the alkaline battery 1 in Examples 1 to 12. That is, in the discharge of the alkaline battery 1, the reaction proceeds from zinc located near the separator 7. At this time, in the alkaline battery 1, since a large amount of zinc powder 40 or zinc powder 40 with a large particle size exists in the outer region R1 close to the separator 7, zinc reacts efficiently at the initial stage and discharge occurs. Zinc becomes zinc oxide by the reaction. Since zinc oxide causes volume expansion, the unreacted zinc powder 40 is pushed into the inner region R2. Here, in the inner region R2, originally the zinc content was small or the zinc powder particle size ratio was small, and since the electrolyte is abundant, the reaction of zinc also proceeds efficiently in the inner region R2. As a result, it is considered that the utilization rate of the zinc powder 40 in the alkaline battery 1 has been improved, and the performance of the alkaline battery 1 has been enhanced.

[0040] FIG. 3 is a diagram showing the manufacturing process of the alkaline battery shown in Examples 1 to 10. First, a cylindrical positive electrode mixture 3 coaxial with the positive electrode can 2 is provided inside the positive electrode can 2 (step S1). Next, a cylindrical separator 7 is provided along the inner peripheral surface of the positive electrode mixture 3 (step S2). Next, a negative electrode mixture 5 containing zinc powder 40 is filled inside the separator 7 (step S3). Next, the opening 18 of the positive electrode can 2 is closed with a gasket 14 and a negative electrode terminal plate 12 (step S4). At this time, a current collecting rod 6 is held by the gasket 14, and when the opening 18 is closed with the gasket 14, the current collecting rod 6 is inserted into the negative electrode mixture 5. The assembly of the alkaline battery 1 is completed by step S4.

[0041] Next, the assembled alkaline battery 1 is rotated about the central axis 19 of the positive electrode can 2 to make the zinc content in the outer region R1 of the negative electrode mixture 5 higher than the zinc content in the inner region R2 (step S5). In step S5, a greater centrifugal force is applied to the zinc powder 40 with a larger particle size among the zinc powders 40 contained in the negative electrode mixture 5 than to the zinc powder 40 with a smaller particle size. Therefore, more zinc powders 40 with a larger particle size move to the outer region R1. As a result, the alkaline battery 1 shown in Examples 1 to 10 with a higher zinc content in the outer region is obtained. In addition, in order to apply a centrifugal force to the zinc powder 40 to such an extent that it moves to the outside, the alkaline battery 1 is rotated at 1000 rpm or more. If the negative electrode mixture 5 is formed with a viscosity such that separation occurs at a rotational speed lower than 1000 rpm, the zinc content and the zinc powder particle size ratio will change during transportation and storage of the alkaline battery 1.

[0042] Note that it is difficult to manufacture an alkaline battery 1 having the same zinc powder particle size ratio between the outer region R1 and the inner region R2 as in Example 11 by a manufacturing method in which it is rotated about the central axis 19 because the zinc powder 40 with a larger particle size moves to the outer region R1.

[0043] In such a case, the alkaline battery 1 can be manufactured by filling the inside of the separator 7 with a negative electrode mixture using a double nozzle capable of ejecting different negative electrode mixtures from the inner nozzle and the outer nozzle. For example, the negative electrode mixture is ejected from both the inner nozzle and the outer nozzle. At this time, as the negative electrode mixture ejected from the outer nozzle, a negative electrode mixture having the same zinc powder particle size ratio as the negative electrode mixture ejected from the inner nozzle but a higher zinc content is used. That is, without performing step S5 shown in FIG. 3, by filling the negative electrode mixture using the double nozzle in step S3, the alkaline battery 1 of Example 11 can be manufactured.

[0044] (Embodiment 2) <Regarding the content ratio of zinc powder contained in the negative electrode mixture> The configuration of the alkaline battery 1 of Embodiment 2 is the same as that of Embodiment 1, but the zinc content ratio is different. The alkaline battery 1 of Embodiment 2 is different from Embodiment 1 in that the zinc content ratio is equal in the outer region R1 and the inner region R2. On the other hand, the zinc powder particle size ratio is larger in the outer region R1 than in the inner region R2.

[0045] In the evaluation test shown in FIG. 2, as a battery having the configuration of the alkaline battery 1 of Embodiment 2, a battery of Example 12 having the configuration of the alkaline battery 1 with a battery size LR6 of a AA battery was prepared. Also in the battery of Example 12, it can be seen that the duration has extended compared to Comparative Examples 1 to 7, and the performance of the alkaline battery 1 has improved.

[0046] As in Example 12, it is difficult to realize a configuration in which the zinc content ratio is equal in the outer region R1 and the inner region R2 and the zinc powder particle size ratio is larger in the outer region R1 by rotating around the central axis 19. This is because it is difficult to precisely control the amount of zinc powder 40 that moves to the outer region R1 by centrifugal force. On the other hand, if a double nozzle is used as in the alkaline battery 1 of Example 11, it can be easily realized.

[0047] <Effect> In the alkaline battery 1 of Embodiment 1, a cylindrical positive electrode can 2, a cylindrical positive electrode mixture 3 provided coaxially with the positive electrode can 2 inside the positive electrode can 2, a cylindrical separator 7 provided along the inner peripheral surface of the positive electrode mixture 3, and a negative electrode mixture 5 filled inside the separator 7 and containing zinc powder 40 are provided. The content rate of the zinc powder 40 in the outer region R1 of the negative electrode mixture 5 is higher than the content rate of the zinc powder 40 in the inner region R2.

[0048] The performance of the alkaline battery 1 is improved because the content rate of the zinc powder 40 in the outer region R1 of the negative electrode mixture 5 is higher than the content rate of the zinc powder 40 in the inner region R2.

[0049] Also, the content rate of the zinc powder 40 in the outer region R1 is 65 to 70 wt%, and the content rate of the zinc powder 40 in the inner region R2 is 58 to 63 wt%. With the above content rates, further improvement in the performance of the alkaline battery 1 is achieved.

[0050] Also, the ratio of the zinc powder 40 having a larger particle size in the zinc powder 40 contained in the outer region R1 is higher than the ratio of the zinc powder 40 having a larger particle size in the zinc powder 40 contained in the inner region R2. With the above ratio, further improvement in the performance of the alkaline battery 1 is achieved.

[0051] When the weight of the zinc powder 40 having a particle size of 150 μm or more is W1 and the weight of the zinc powder 40 having a particle size of 75 μm or less is W2, in the outer region R1, 1 ≤ W1 / W2 ≤ 2, and in the inner region R2, 0.5 ≤ W1 / W2 ≤ 1. With the above ratio, further improvement in the performance of the alkaline battery 1 is achieved.

[0052] In the alkaline battery 1 of Embodiment 2, a cylindrical positive electrode can 2, a cylindrical positive electrode mixture 3 provided coaxially with the positive electrode can 2 inside the positive electrode can 2, a cylindrical separator 7 provided along the inner peripheral surface of the positive electrode mixture 3, and a negative electrode mixture 5 filled inside the separator 7 and containing zinc powder 40 are provided. The ratio of the zinc powder 40 having a larger particle size in the zinc powder 40 contained in the outer region R1 is higher than the ratio of the zinc powder 40 having a larger particle size in the zinc powder 40 contained in the inner region R2.

[0053] The ratio of zinc powder 40 contained in the outer region R1 of the negative electrode mixture 5 being higher than that of zinc powder 40 contained in the inner region R2 improves the performance of the alkaline battery 1.

[0054] The method for manufacturing the alkaline battery 1 according to Embodiment 1 includes a step of providing a cylindrical positive electrode mixture 3 coaxially with the cylindrical positive electrode can 2 inside the cylindrical positive electrode can 2, a step of providing a cylindrical separator 7 along the inner peripheral surface of the positive electrode mixture 3, a step of filling the inside of the separator 7 with a negative electrode mixture 5 containing zinc powder 40, and rotating the positive electrode can 2 provided with the positive electrode mixture 3, the separator 7, and the negative electrode mixture 5 inside about the central axis 19 of the positive electrode can 2 to make the content rate of zinc powder 40 in the outer region R1 of the negative electrode mixture 5 higher than the content rate of zinc powder 40 in the inner region R2.

[0055] According to the above manufacturing method, the zinc powder 40 can be moved to the outer region R1 by centrifugal force, and the zinc content rate in the outer region R1 of the negative electrode mixture 5 can be made higher than the zinc content rate in the inner region R2. Thereby, an alkaline battery 1 with improved performance can be obtained.

Explanation of Reference Numerals

[0056] 1 Alkaline battery 2 Positive electrode can 3 Positive electrode mixture 5 Negative electrode mixture 6 Current collector rod 7 Separator 12 Negative electrode terminal plate 14 Gasket 15 Cylindrical part 16 Bottom part 17 Positive electrode terminal 18 Opening 19 Central axis 21 Cylindrical part 22 Bottom part 40 Zinc powder

Claims

1. A cylindrical positive electrode can, A cylindrical positive electrode mixture provided coaxially with the positive electrode can and inside the positive electrode can, A cylindrical separator provided along the inner peripheral surface of the positive electrode mixture, A negative electrode mixture filled inside the separator and containing zinc powder, and comprising: An alkaline battery in which the content rate of zinc powder in the outer region of the negative electrode mixture is higher than the content rate of zinc powder in the inner region.

2. The alkaline battery according to claim 1, wherein the content rate of zinc powder in the outer region is 65 to 70 wt%, and the content rate of zinc powder in the inner region is 58 to 63 wt%.

3. The alkaline battery according to claim 1, wherein the ratio of zinc powder having a larger particle size in the zinc powder contained in the outer region is higher than that in the zinc powder contained in the inner region.

4. When the weight of zinc powder having a particle size of 150 μm or more is W1 and the weight of zinc powder having a particle size of 75 μm or less is W2, In the outer region, 1 ≦ W1 / W2 ≦ 2, The alkaline battery according to claim 3, wherein in the inner region, 0.5 ≦ W1 / W2 ≦ 1.

5. A cylindrical positive electrode can, A cylindrical positive electrode mixture provided coaxially with the positive electrode can and inside the positive electrode can, A cylindrical separator provided along the inner peripheral surface of the positive electrode mixture, A negative electrode mixture filled inside the separator and containing zinc powder, and comprising: An alkaline battery in which the ratio of zinc powder having a larger particle size in the zinc powder contained in the outer region is higher than that in the zinc powder contained in the inner region.

6. A step of providing a cylindrical positive electrode mixture coaxially with the positive electrode can inside the cylindrical positive electrode can, A step of providing a cylindrical separator along the inner peripheral surface of the positive electrode mixture, A step of filling a negative electrode mixture containing zinc powder inside the separator, A method for manufacturing an alkaline battery, comprising a step of rotating the positive electrode can provided with the positive electrode mixture, the separator, and the negative electrode mixture inside about the central axis of the positive electrode can to make the content rate of the zinc powder in the outer region of the negative electrode mixture higher than the content rate of the zinc powder in the inner region.

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