JP2010108821A - Electrode for alkaline storage battery, and alkaline storage battery with the same - Google Patents

Abstract

An electrode for an alkaline storage battery that contributes to improving the reliability of the battery and that can be manufactured at low cost, and an alkaline storage battery that includes this electrode and that can be manufactured at low cost and with high reliability.
An electrode used for an alkaline storage battery in which an electrode body formed by stacking a plurality of electrodes facing each other with a separator interposed in a rectangular casing is formed of a conductive material and is smooth A flat substrate having a main surface and an end surface, and a composite material including an active material, a binder, and a conductive additive applied on the substrate.
[Selection] Figure 2

Description

  The present invention relates to an electrode used for a rectangular alkaline storage battery having a laminated type electrode body and an alkaline storage battery including the electrode.

  Conventionally, various rechargeable secondary batteries used mainly as a power source for portable devices have been proposed. Further, in recent years, large-capacity secondary batteries have been developed with the introduction of new energy such as wind power generation and solar power generation, which can be expected to provide benefits as a global warming prevention and distributed energy system. New energy is a power source that is easily affected by nature and has unstable output. When introduced in large quantities, the output is smoothed by power storage technology, or the storage of new energy generated power at light loads such as at night. This is necessary.

  Furthermore, in recent years, a battery equipped with a rechargeable battery has been developed for vehicles such as automobiles and trains in consideration of the environment. When a secondary battery is mounted on the vehicle, the regenerative power generated during braking can be stored in the mounted battery and used as a power source for the vehicle, so that the operating energy efficiency of the vehicle can be increased. Thus, for example, a nickel metal hydride secondary battery is considered suitable as a secondary battery mounted on a vehicle from various conditions such as energy density, load fluctuation followability, durability, and manufacturing cost (Patent Document 1). .

  In general, in a nickel metal hydride secondary battery, a porous foamed nickel or nickel sintered body is used as a positive electrode substrate, and an active material, a binder, a conductive additive, etc. are formed in pores or gaps formed in the substrate. A positive electrode is produced by filling a mixture. By producing the positive electrode in this manner, the adhesion of the active material to the substrate is increased, and the reliability of the battery is improved.

  Moreover, as a negative electrode substrate of a nickel metal hydride battery, for example, a punching plate in which a large number of holes are formed in a nickel-plated steel plate is used, and an active material is applied to the substrate, thereby allowing the active material to adhere to the substrate. (For example, Patent Document 1).

  By the way, since the vehicle battery as described above is required to have a higher voltage and a higher energy capacity than those used in conventional portable devices, it is necessary to use a large battery. When a large battery is used, it is desirable to use a square battery rather than a cylindrical battery because there is a great need to efficiently use the space where the battery is installed (Patent Document 1). In such a large square battery, from the viewpoint of battery performance and productivity, an electrode in which positive plates and negative plates are alternately stacked via separators rather than a wound electrode body used for a cylindrical battery. It is said that the body is more suitable.

  However, in such a laminated electrode body, there are many contact points between the flat electrode and the separator. Therefore, when foamed nickel or a punching plate is used as an electrode substrate, voids or gaps exposed on the end surface of the substrate are used. The burrs formed at the edges of the pierce easily break through the separator and cause an internal short circuit. In addition, since the electrode body is repeatedly expanded and contracted during charging and discharging in the battery, mechanical strength is required for the electrode substrate used for a large-sized rectangular battery, but it is formed of nickel foam or a punching plate. In the case of a substrate, it is difficult to increase the substrate thickness from the viewpoint of workability. Furthermore, members such as foamed nickel and punching plates are expensive, which increases the cost of the battery.

JP 2001-110381 A

  An object of the present invention is to provide an electrode for an alkaline storage battery that contributes to improving the reliability of the battery and can be manufactured at low cost by using an electrode substrate having a smooth main surface and end surface in order to solve the above-mentioned problems, and It is an object of the present invention to provide an alkaline storage battery comprising this electrode, which is excellent in reliability and can be manufactured at low cost.

  In order to achieve the above-described object, the alkaline storage battery electrode according to the present invention is an alkaline storage battery in which an electrode body formed by laminating a plurality of electrodes facing each other via a separator in a rectangular casing. A flat plate substrate having a smooth main surface and an end surface formed of a conductive material, and an active material, a binder, and a conductive additive applied on the substrate. With. Here, “smooth main surface and end surface” means that the main surface and the end surface do not have irregularities or hole processing due to the porous body structure. Such an electrode configuration can be applied to both the positive electrode and the negative electrode.

  According to this configuration, in the prismatic battery having the stacked electrode body, the main surface and the end face of the flat electrode substrate are smoothed, so that the internal short circuit of the battery due to the burr of the substrate is effectively generated. Can be prevented. In addition, since the metal plate can be used as an electrode substrate as it is, it is easy to increase the substrate thickness and ensure the mechanical strength of the electrode. Therefore, it can greatly contribute to improving the reliability of the prismatic alkaline storage battery including such an electrode. Furthermore, such a battery having excellent reliability can be manufactured at low cost.

  In the electrode having the above structure, the substrate can be formed of, for example, a nickel-plated steel plate. With this configuration, it is possible to improve the performance of the battery by using a material having low contact resistance and excellent corrosion resistance and mechanical strength as an electrode substrate at low cost.

  In the electrode having the above structure, as the binder, for example, a low unsaturated polymer is selected from a hydroxyl group-containing monomer, a carboxyl group-containing monomer, a glycidyl group-containing monomer, an alkoxysilane group-containing monomer, and a chlorine-containing monomer. A non-aqueous binder containing a modified polymer modified with a species or a mixture of two or more species can be used. By comprising in this way, the adhesiveness of an active material and a board | substrate can be maintained even if it is the electrode formed by apply | coating a compound material on a smooth board | substrate. In addition, since the water-insoluble binder has water repellency, it can diffuse oxygen generated on the positive electrode and quickly return it to water on the negative electrode, which is also effective in preventing the electrolyte from drying out. It is. As a result, it is possible to maintain the performance of the battery in which this electrode is used while effectively preventing an internal short circuit and improving the reliability.

  In the electrode having the above structure, for example, carbon powder can be used as the conductive additive. By comprising in this way, sufficient electroconductivity is securable even if it is the electrode formed by apply | coating compound material on a smooth board | substrate. As a result, it is possible to maintain the performance of the battery in which this electrode is used while effectively preventing an internal short circuit and improving the reliability.

  In the electrode having the above structure, the thickness of the substrate is preferably in the range of 50 μm to 600 μm. By forming an electrode substrate with a plate-like member having a smooth main surface and end surface without using nickel foam or a punching plate, it is easy to adjust the substrate thickness, especially to increase the substrate strength by increasing the thickness. Therefore, it is possible to greatly contribute to the reliability of the battery.

  The alkaline storage battery according to the present invention is configured by accommodating an electrode body formed by laminating a plurality of electrodes facing each other via a separator in a rectangular casing, and the electrode having the above-described configuration according to the present invention. At least as a positive electrode or a negative electrode. By configuring in this way, even an alkaline storage battery having a laminated electrode body with many contact points between the separator and the end face of the electrode can effectively prevent internal short circuit and charge / discharge performance and reliability of the battery. Can be improved. Furthermore, by using a flat substrate that can be easily processed, the manufacturing cost of the battery can be greatly reduced.

  As described above, according to the alkaline storage battery electrode and the alkaline storage battery including the same according to the present invention, the internal short circuit caused by the burr of the electrode substrate is adopted while adopting the electrode body having the laminated structure suitable for the large rectangular battery. Can be effectively prevented and the mechanical strength of the electrode can be increased to improve the performance and reliability of the battery. Furthermore, the manufacturing cost of a battery can be reduced by using a flat substrate that is easy to process as an electrode.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments.

  FIG. 1 is a perspective view showing a structure of a rectangular alkaline storage battery (hereinafter simply referred to as “battery”) 1 including an alkaline storage battery electrode according to an embodiment of the present invention. The battery 1 according to the present embodiment is configured as a nickel hydride secondary battery using nickel hydroxide as a main positive electrode active material, a hydrogen storage alloy as a main negative electrode active material, and an alkaline aqueous solution as an electrolyte, A rectangular first lid member 3 and second lid member 5 also serving as positive and negative current collectors, and a frame-shaped member 7 made of an insulating material interposed between the first and second lid members 3 and 5, provide a battery. A rectangular casing 9 is formed.

  As shown in the cross-sectional view of FIG. 2, inside the casing 9, a separator 11 bent into a pleat shape and an electrode body 17 including electrodes, that is, a positive electrode 13 and a negative electrode 15 are accommodated. The positive electrode 13 is formed by applying a positive electrode mixture 23 to both surfaces 21 a and 21 a that are main surfaces of a flat plate-like positive electrode substrate 21. Similarly, the negative electrode 15 is formed by applying a negative electrode mixture 27 to both surfaces 25 a and 25 a which are main surfaces of a flat plate-like negative electrode substrate 25.

  As shown in FIG. 3, which shows an enlarged view of the main part of FIG. 2, the positive electrode 13 and the negative electrode 15 are arranged with a separator 11 in a direction X in which the surfaces 21a and 25a of the substrates 21 and 25 of both electrodes face each other. Are alternately stacked. At this time, part of the end surfaces 21 b and 25 b of the positive electrode substrate 21 and the negative electrode substrate 25 faces the bent portion 11 a of the pleated separator 11.

  The electrode body 17 configured as described above is disposed in the casing 9 so that the stacking direction X and the facing direction Y of the first and second lid members 3 and 5 are orthogonal to each other. Therefore, the end surface 21 b of the positive electrode substrate 21 faces the second lid member 5 that is a negative electrode current collector plate via the bent portion 11 a of the pleated separator 11, and the end surface 25 b of the negative electrode substrate 25 is separated from the separator 11. The first lid member 3 that is a positive electrode current collector plate is opposed to the bent portion 11a.

  The electrode body 17 may have a laminated structure other than the pleated structure. For example, the positive electrode 13 and the negative electrode 15 accommodated in a plurality of separate bag-shaped separators may be alternately stacked and face each other, or may be accommodated in separate bag-shaped separators. Further, the positive electrode 13 and the negative electrode may be further laminated so as to face each other via the pleated separator 11.

  The positive electrode substrate 21 is formed as a conductive material, specifically, a flat plate member made of a steel plate plated with nickel, for example. Moreover, as shown in the partially broken perspective view of FIG. 4, both surfaces 21a and 21a and each end surface 21b of the positive electrode substrate 21 are formed as smooth surfaces having no holes or irregularities. Similarly, as shown in the partially broken perspective view of FIG. 5, the negative electrode substrate 25 is formed as a flat plate member made of a nickel-plated steel plate, and both surfaces 25a and 25a of the negative electrode substrate 25 and each end surface are formed. 25b is formed as a smooth surface having no holes or irregularities. The boundary between both surfaces of the positive electrode substrate 21 to the negative electrode substrate 25 and each end surface may be rounded by chamfering, for example. Thereby, the burr | flash at the time of a process can be removed. Further, blasting or serration processing may be performed on both surfaces of the positive electrode substrate and the negative electrode substrate. Thereby, the adhesiveness of the active material is improved.

  The material for forming the positive and negative electrode substrates 21 and 25 can be appropriately selected in consideration of electrochemical characteristics, mechanical strength, corrosion resistance, etc. in addition to the nickel-plated steel plate. Stainless steel plates, copper-plated steel plates, silver-plated steel plates, cobalt-plated steel plates, chrome-plated steel plates and the like are preferably used.

  Since the positive and negative substrates 21 and 25 can be formed by cutting a plate-shaped material having no holes, the thickness can be easily set. In the battery 1 of the present embodiment, conduction between the positive electrode 13 and the negative electrode 15 and the first lid member 3 and the second lid member 5 that are the current collector plates on the positive electrode side and the negative electrode side is caused by foreign matters such as metal scraps. In order to prevent mixing and simplify the process, welding is not performed, and only the contact pressure in the facing direction Y of the lid members 3 and 5 is ensured. Therefore, the positive and negative substrates 21 and 25 are required to have mechanical strength that can withstand the pressure applied in the surface direction (opposing direction Y). From this viewpoint, the thickness of the positive and negative electrode substrates 21 and 25 is preferably 50 μm or more. On the other hand, from the viewpoint of ensuring the energy density of the battery 1, the thickness of the positive and negative electrode substrates 21 and 25 is preferably 0.6 mm or less. The range of the thickness of the more preferable substrates 21 and 25 is 50 to 200 μm, and more preferably 80 to 150 μm. The Vickers hardness of the substrates 21 and 25 is preferably in the range of 70 to 300 Hv.

  The positive electrode mixture 23 applied to both surfaces 21a and 21a of the positive electrode substrate 21 is made by mixing nickel hydroxide, which is a positive electrode active material, a binder, and a conductive additive as main components, and mixing them. The negative electrode mixture 27 applied to both surfaces 25a and 25a of the negative electrode substrate 25 includes a hydrogen storage alloy that is a negative electrode active material, a binder, and a conductive additive as main components, and is prepared by mixing them.

  Next, binders and conductive aids that are preferably used for the positive and negative composites 23 and 27 will be described.

(binder)
As the binder in this embodiment, it is preferable to use a water-insoluble one. An organic solvent is sometimes used as a solvent for the water-insoluble binder. However, since the organic solvent is a toxic substance and has flammability, it is difficult to handle in the manufacturing process. From the viewpoint of ease of handling, water-soluble binders are excellent, but water-insoluble binders are excellent in that the adhesion between the active material and the substrate is high, and the active material can be prevented from falling off and increase in contact resistance can be suppressed. ing. Furthermore, since the water-insoluble binder has water repellency, it can diffuse oxygen generated on the positive electrode and quickly return it to water on the negative electrode, which is also effective in preventing the electrolyte from drying out. It is.

  Specifically, the binder is made of a polymer of a monomer selected from ethylene, propylene, butylene, styrene, vinyl acetate, vinyl alcohol, vinyl chloride, vinylidene chloride, vinyl fluoride, and vinylidene fluoride. It is preferable to use a modified polymer obtained by modifying a saturated polymer with one or a mixture of two or more of a hydroxyl group-containing monomer, a carboxyl group-containing monomer, a glycidyl group-containing monomer, an alkoxysilane group-containing monomer, and a chlorine-containing monomer. it can. Hydroxyl acrylate (or methacrylate) as the hydroxyl group-containing monomer, acrylic acid, methacrylic acid, maleic anhydride, etc. as the carboxyl group-containing monomer, glycidyl methacrylate, allyl glycidyl acrylate, etc. as the glycidyl group-containing monomer, As the alkoxysilane-containing monomer, methacryloyloxyalkoxysilane can be preferably used, and as the chlorine-containing monomer, vinyl chloride, methyl 2-chloroacrylate, methacrylic acid chloride or the like can be preferably used.

  Moreover, as an addition amount of the binder with respect to an active material, it is preferable to add 1-10 weight part of binders with respect to 100 weight part of positive electrode active materials in a positive electrode. When the addition ratio of the binder is smaller than this, sufficient adhesion cannot be obtained, and the active material falls off. On the other hand, when the addition ratio of the binder is larger than this, the utilization rate is lowered by covering the surface of the active material with the binder, and sufficient battery energy density cannot be obtained. In the case of the negative electrode, since the active material density is high and the volume is relatively small, the amount of addition required is smaller than that in the case of the positive electrode, and the binder is 0.5 to 5 weights with respect to 100 parts by weight of the negative electrode active material. It is desirable to add a part.

  As an example of the binder used for the positive electrode mixture, in this embodiment, an ethylene vinyl acetate copolymer (EVA; ethylene 90%, vinyl acetate 10%) and a vinyl chloride-based polymer (one obtained by grafting vinyl chloride to EVA); An average polymerization degree of 900 and an EVA content of 55% were mixed at a weight ratio of 85:15.

  As an example of the binder used for the negative electrode mixture, modified EVA obtained by modifying the EVA used for the positive electrode mixture was used in the present embodiment. The modification treatment was performed by graft polymerization of maleic anhydride on EVA. In this case, if the degree of maleation is too small, the adhesiveness is lowered, and if it is too large, the solubility in a solvent is lowered. Therefore, it is preferably in the range of 0.1 to 20 parts by weight with respect to the polymer 100.

(Conductive aid)
As the conductive additive in the present embodiment, carbon or a metal having alkali resistance and oxidation resistance such as nickel is preferably used. Fine-grained conductive assistants (particle diameter 20 nm to 1 μm), coarse-grained conductive assistants (particle diameter 1 μm to 200 μm), fibrous conductive assistants (fiber diameter 1 to 15 μm, fiber length 50 to It is desirable to use a combination of any two or more of 300 μm). In particular, the fine conductive additive is effective for entering a gap between the active materials to form a fine conductive network. However, if only the fine conductive additive is used, cracks are likely to occur in the electrode. However, when a coarse granular conductive additive or a fibrous conductive additive is added to the fine granular conductive additive, generation of cracks in the electrode is suppressed. The mixing ratio of the finely divided conductive additive and the coarse granular or fibrous conductive additive is preferably in the range of 5: 1 to 1: 5, more preferably about 1: 1. When the mixing ratio of the finely divided conductive additive is larger than this range, sufficient crack suppression effect cannot be obtained, and when the mixed ratio of the finely divided conductive additive is smaller than this range, a fine conductive network is formed. Thus, sufficient conduction assistance cannot be obtained.

  Moreover, as an addition amount of the conductive support material with respect to the active material, it is preferable to add 1 to 20 parts by weight of the conductive support material with respect to 100 parts by weight of the positive electrode active material in the positive electrode. When the addition ratio of the conductive auxiliary material is smaller than this, a sufficient conductive auxiliary effect cannot be obtained, and the utilization factor of the active material becomes low. On the other hand, when the addition ratio of the conductive additive is larger than this, a sufficient battery energy density cannot be obtained. In the case of the negative electrode, since the active material is an alloy and has conductivity, the amount of addition required is smaller than that in the case of the positive electrode. It is desirable to add 5 to 10 parts by weight.

As an example of the conductive agent used in the positive electrode material and negative electrode material, in the present embodiment, carbon black (primary particle size 50 nm, dibutyl phthalate absorption 175cm ^3/100 g, Raman spectroscopy G value 0.43, the heat treatment temperature 2300 ° C) and polyacrylonitrile-based carbon fiber (X-ray diffraction 004 plane half-width 2.5 ° / Cu-Kα, heat treatment temperature 2400 ° C) mixed at a weight ratio of 1: 1 was used.

  Each embodiment according to the present invention described above can be applied not only to the battery 1 shown in FIG. 1 but also to, for example, a prismatic battery used in a battery module B configured as shown in FIG. . This battery module B is formed by stacking a plurality of batteries 1 configured as rectangular nickel-hydrogen secondary batteries so as to be connected in series. The battery 1 includes a frame-shaped member 57 made of an insulating material having a slightly smaller dimension than the two current collectors, between a flat plate-shaped positive electrode current collector 53 and a negative electrode current collector 55 that do not have bent portions arranged opposite to each other. A rectangular casing 59 is formed to be interposed, and an electrode body (not shown) having the same structure as described above is accommodated in the casing 59 together with the electrolytic solution. On both end faces of the laminate of the battery 1, compression plates 61 and 61 covering the entire end face are disposed. A long bolt 63 made of an insulating material is inserted into a plurality of bolt holes formed on both sides of the current collectors 53 and 55 and the compression plates 61 and 61 of each battery 1, and a nut 65 is screwed to the tip thereof. By doing so, the battery module B is assembled. The positive electrode terminal 67 and the negative electrode terminal 69 of the battery module B project from the one positive electrode current collector 53 and the other negative electrode current collector 55 of the batteries 1 and 1 located at both ends of the laminate, respectively.

  According to the electrode (positive electrode 13, negative electrode 15) and the battery 1 including the same according to the present embodiment, the following effects can be obtained.

  The positive electrode 13 and the negative electrode 15 used in the battery 1 in FIG. 3 are smooth surfaces 21a, 25a on which holes and irregularities are not formed as substrates for applying the composite materials 23, 27 containing an active material and the like. The flat board | substrates 21 and 25 which have the smooth end surfaces 21b and 25b are used. As a result, it is possible to effectively prevent the occurrence of an internal short circuit of the battery 1 due to the burr of the substrate, which greatly contributes to the improvement of the durability and reliability of the battery 1. In particular, in the battery 1 according to the present embodiment, the end surfaces 21b and 25b of the positive and negative substrates and the second and first lid members 5 and 3 that are the negative and positive current collectors serve as the separator 11. Therefore, the effect of improving the reliability of the battery 1 by smoothing the end faces 21b and 25b is extremely large.

  Further, since the metal plate material can be cut out as it is and used as the electrode substrates 21 and 25, it is easy to increase the substrate thickness and ensure the mechanical strength of the electrode. In particular, in the battery 1 according to the present embodiment, both the lid members 3, 5 and the positive and negative electrode substrates 21, 5 due to the contact pressure in the facing direction Y of both the lid members 3, 5, that is, the surface direction of the flat substrates 21, 25. Since the electrical connection with 25 is ensured, the mechanical strength of the substrate is secured by setting the thicknesses of the positive and negative substrates 21 and 25 to appropriate values, thereby preventing the bases 21 and 25 from being deformed. The performance and reliability of the battery 1 can be greatly improved.

  Furthermore, in this embodiment, since the electrode substrates 21 and 25 are made of nickel-plated steel plates, a material having low contact resistance and excellent corrosion resistance and mechanical strength can be used at low cost. By using as the substrates 21 and 25, the performance of the battery 1 can be improved.

  Moreover, in the electrodes 13 and 15 having the above-described structure, a non-aqueous solution binder containing a modified polymer is used as a binder, so that the composite materials 23 and 25 are formed on the smooth substrates 21 and 25 by coating. Even if it is an electrode, the adhesiveness of an active material and a board | substrate can be maintained. In addition, in the electrode having the above structure, by using carbon powder as a conductive aid, sufficient conductivity can be ensured even for an electrode formed by applying a mixture on a smooth substrate. Can do. Thereby, while maintaining the performance and durability of the battery 1 in which this electrode is used, it is possible to effectively prevent an internal short circuit and improve the reliability.

  In addition, although this embodiment demonstrated the example which comprised the battery 1 as a nickel hydride secondary battery, this invention is applicable also to the electrode used for another kind of alkaline storage battery. For example, an air electrode or a silver oxide electrode can be used as the positive electrode, and an electrode having cadmium, zinc, iron, or the like as the main active material can be used as the negative electrode.

  As described above, the preferred embodiments of the present invention have been described with reference to the drawings, but various additions, modifications, or deletions can be made without departing from the spirit of the present invention. Therefore, such a thing is also included in the scope of the present invention.

It is a perspective view which shows the alkaline storage battery which concerns on one Embodiment of this invention. It is sectional drawing which shows typically the structure of the electrode body inside the battery of FIG. It is sectional drawing which expands and shows the principal part of FIG. It is a partially broken perspective view which shows the structure of the positive electrode used for the battery of FIG. It is a partially broken perspective view which shows the structure of the negative electrode used for the battery of FIG. It is a perspective view which shows the other structural example of the alkaline storage battery which concerns on one Embodiment of this invention.

Explanation of symbols

1 Battery 9 Casing 11 Separator 13 Positive Electrode (Electrode)
15 Negative electrode (electrode)
17 Electrode body 21 Positive electrode substrate 21a Surface (main surface) of positive electrode substrate
21b End face 23 of positive electrode substrate Positive electrode mixture 25 Negative electrode substrate 25a Surface (main surface) of negative electrode substrate
25b End face 27 of negative electrode substrate Negative electrode composite

Claims (9)

In a rectangular casing, an electrode used for an alkaline storage battery containing an electrode body formed by laminating a plurality of electrodes opposed via a separator,
A flat substrate having a smooth main surface and an end surface formed of a conductive material;
A composite material comprising an active material, a binder and a conductive additive applied on the substrate;
An electrode for an alkaline storage battery.   The alkaline storage battery electrode according to claim 1, wherein the substrate is a nickel-plated steel plate.   3. The binder according to claim 1, wherein the binder is a low unsaturated polymer selected from the group consisting of a hydroxyl group-containing monomer, a carboxyl group-containing monomer, a glycidyl group-containing monomer, an alkoxysilane group-containing monomer, and a chlorine-containing monomer. An electrode for an alkaline storage battery, which is a water-insoluble binder containing a modified polymer modified with a mixture of the above.   4. The alkaline storage battery electrode according to claim 1, wherein the conductive additive contains carbon.   5. The alkaline storage battery electrode according to claim 1, wherein the thickness of the substrate is in the range of 50 μm to 600 μm. 6.   The electrode for alkaline storage batteries according to any one of claims 1 to 5, wherein the electrode is configured as a positive electrode.   6. The alkaline storage battery electrode according to claim 1, wherein the alkaline storage battery electrode is configured as a negative electrode.   An alkaline storage battery in which an electrode body formed by laminating a plurality of electrodes facing each other via a separator is housed in a rectangular casing, wherein the electrode according to any one of claims 1 to 7 is used. An alkaline storage battery provided as at least a positive electrode.   An alkaline storage battery in which an electrode body formed by laminating a plurality of electrodes facing each other via a separator is housed in a rectangular casing, wherein the electrode according to any one of claims 1 to 7 is used. An alkaline storage battery provided as at least a negative electrode.

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