Ion conduction coating, alkaline zinc-manganese battery and preparation method of alkaline zinc-manganese battery

Abstract

The invention relates to an ion conduction coating, an alkaline zinc-manganese battery and a preparation method of the alkaline zinc-manganese battery. The ion conduction coating comprises liquid retention fibers, a binder and a solvent, wherein the liquid retention fiber comprises at least one of polyethylene glycol fiber, polypropylene fiber or natural fiber, the binder comprises at least one of polyacrylic acid, sodium polyacrylate, cellulose or starch material, the mass ratio of the liquid retention fiber to the binder is 100: 0.1-100: 5, and the viscosity of the ion conduction coating at 20 DEG C is 800 mPa.s-1000 mPa.s. When the ion conduction coating is used for preparing the alkaline zinc-manganese battery, a positive electrode ring and a diaphragm can be tightly matched, so that the output current and the discharge voltage in the discharge process of the alkaline zinc-manganese battery are improved, and internal short circuit of the alkaline zinc-manganese battery is also prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of alkaline zinc-manganese batteries, and particularly to an ion-conducting coating, an alkaline zinc-manganese battery and a preparation method thereof. Background Art

[0002] Alkaline zinc-manganese dry batteries, abbreviated as alkaline manganese batteries, mainly consist of a steel shell, a positive electrode ring, a separator tube, zinc paste, electrolyte, and a sealing body. They are widely used as power sources in small appliances due to their advantages such as long lifespan, convenience, low cost, safety, and environmental friendliness.

[0003] However, due to the problem of poor fit between the positive electrode ring and the separator, during the discharge process of alkaline zinc-manganese dry batteries, there are problems of weak current output ability and low voltage.

[0004] In addition, during the production process of alkaline zinc-manganese dry batteries, internal short circuits may occur due to the diffusion and penetration of positive electrode active materials into the separator tube, excessive impurity content in battery materials, or the generation of zinc dendrites at the negative electrode. Although the separator tube can, to a certain extent, avoid the occurrence of internal short circuits, it still cannot completely prevent internal short circuits caused by excessive impurity content in battery materials or the generation of zinc dendrites at the negative electrode; moreover, with the demand for large-capacity and high-power batteries, the particle sizes of the positive electrode active material manganese dioxide and the conductive agent graphite are getting finer and finer, and traditional separators can no longer meet the requirements for long storage life. Summary of the Invention

[0005] Based on this, in view of the above problems, it is necessary to provide an ion-conducting coating, an alkaline zinc-manganese battery and a preparation method thereof. By using this ion-conducting coating to prepare an alkaline zinc-manganese battery, the fit between the positive electrode ring and the separator can be made tight, which not only improves the output current and discharge voltage during the discharge process of the alkaline zinc-manganese battery, but also prevents internal short circuits in the alkaline zinc-manganese battery.

[0006] The present invention discloses an ion-conducting coating, which includes liquid-retaining fibers, a binder, and a solvent.

[0007] Among them, the liquid-retaining fibers include at least one of polyethylene glycol fibers, polypropylene fibers, or natural fibers, the binder includes at least one of polyacrylic acid, sodium polyacrylate, cellulose, or starch, the mass ratio of the liquid-retaining fibers to the binder is 100∶0.1 - 100∶5, and the viscosity of the ion-conducting coating at 20°C is 800 mPa·s - 1000 mPa·s.

[0008] In one embodiment, the solid content in the ion-conducting coating is 10% - 50%.

[0009] In one embodiment, the liquid-retaining fiber at least includes polyethylene glycol fiber, and the mass fraction of the polyethylene glycol fiber in the liquid-retaining fiber is greater than or equal to 10%.

[0010] In one embodiment, the liquid-retaining fiber includes polyethylene glycol fiber, polypropylene fiber and natural fiber, and the mass ratio of the polyethylene glycol fiber, the polypropylene fiber to the natural fiber is 8:1:1 - 1:5:3.

[0011] In one embodiment, the binder at least includes starch, and the mass fraction of the starch in the binder is greater than or equal to 10%.

[0012] In one embodiment, the binder includes polyacrylic acid, sodium polyacrylate, cellulose and starch, and the mass ratio of the polyacrylic acid, the sodium polyacrylate, the cellulose to the starch is 1:1:4:4 - 4:4:1:1.

[0013] In one embodiment, the ion-conducting coating further satisfies at least one of the following conditions:

[0014] (1) When the liquid-retaining fiber includes polyethylene glycol fiber, the diameter of the polyethylene glycol fiber is 1 μm - 10 μm, and the length is below 50 μm;

[0015] (2) When the binder includes cellulose, the cellulose includes at least one of sodium carboxymethyl cellulose, methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose or hydroxyethyl methyl cellulose;

[0016] (3) When the binder includes starch, the starch includes at least one of modified hydroxypropylated starch, graft copolymerized starch, cationic starch, anionic starch or dialdehyde starch;

[0017] (4) The solvent is selected from water or potassium hydroxide aqueous solution;

[0018] (5) The mass fraction of the solvent in the ion-conducting coating is 30% - 90%.

[0019] An alkaline zinc-manganese battery, wherein the ion-conducting coating as described above is filled between the positive electrode ring and the separator of the alkaline zinc-manganese battery.

[0020] In one embodiment, the thickness of the ion-conducting coating is 0.01 mm - 0.3 mm.

[0021] A preparation method of an alkaline zinc-manganese battery, comprising the following steps:

[0022] Provide the ion-conducting coating as described above;

[0023] Form the ion-conducting coating on the inner wall of the positive electrode ring in the semi-finished alkaline zinc-manganese battery, insert the separator tube, and make the separator tube contact with the ion-conducting coating;

[0024] Inject the negative electrode material into the separator tube, insert the negative electrode into the negative electrode material, and press and seal to obtain the alkaline zinc-manganese battery.

[0025] In the ion-conducting coating provided by the present invention, the liquid-retaining fibers and the binder cooperate with each other. When the ion-conducting coating is used to fill the space between the positive electrode ring and the separator tube of the alkaline zinc-manganese battery, the liquid-retaining fibers have excellent hydrophilicity and alkali resistance and can construct the framework of the ion channel; on the one hand, the binder increases the consistency of the ion-conducting coating, making the viscosity of the ion-conducting coating 800 mPa·s - 1000 mPa·s at 20 °C, so that the liquid-retaining fibers are kept between the positive electrode ring and the separator tube, and the positive electrode ring and the separator tube are closely matched; on the other hand, the binder absorbs and stores the electrolyte, thereby realizing ion conduction. Furthermore, during the discharge process of the alkaline zinc-manganese battery, the ion conduction distance is shortened, the electrochemical concentration polarization is reduced, and the current output by the battery and the voltage during battery discharge are increased.

[0026] Since the ion-conducting coating itself is non-conductive and colloidal and porous-free, with a viscosity of 800 mPa·s - 1000 mPa·s at 20 °C; therefore, it has excellent barrier properties and can avoid internal short circuits caused by high impurities inside the battery; in addition, since the ion-conducting coating can also absorb and store the electrolyte and can dissolve trace amounts of zinc, it can prevent the generation of zinc dendrites, thereby preventing internal short circuits in the alkaline zinc-manganese battery. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is a schematic structural diagram of the positive electrode ring.

[0029] In the figure, 10 is the inner wall. Detailed Embodiments

[0030] To facilitate the understanding of the present invention, the present invention will be described in more detail below. However, it should be understood that the present invention can be implemented in many different forms and is not limited to the embodiments or examples described herein. On the contrary, the purpose of providing these embodiments or examples is to make the understanding of the disclosure content of the present invention more thorough and comprehensive.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments or examples only and are not intended to limit the present invention. The optional scope of the term "and / or" used herein includes any one of two or more related listed items, and also includes any and all combinations of the related listed items, and the any and all combinations include combinations of any two related listed items, any more related listed items, or all related listed items.

[0032] The present invention provides an ion-conducting coating, which includes liquid-retaining fibers, a binder, and a solvent; wherein, the liquid-retaining fibers include at least one of polyethylene glycol fibers, polypropylene fibers, or natural fibers, and the binder includes at least one of polyacrylic acid, sodium polyacrylate, cellulose, or starch materials. The mass ratio of the liquid-retaining fibers to the binder is 100∶0.1 - 100∶5, and the viscosity of the ion-conducting coating at 20°C is 800 mPa·s - 1000 mPa·s.

[0033] In the ion-conducting coating provided by the present invention, the liquid-retaining fibers and the binder cooperate with each other. When the ion-conducting coating is used to fill between the positive electrode ring and the separator tube of an alkaline zinc-manganese battery, the liquid-retaining fibers have excellent hydrophilicity and alkali resistance and can construct the skeleton of the ion channel; on the one hand, the binder increases the consistency of the ion-conducting coating, so that the viscosity of the ion-conducting coating at 20°C is 800 mPa·s - 1000 mPa·s, thereby keeping the liquid-retaining fibers between the positive electrode ring and the separator tube and making the positive electrode ring and the separator tube fit tightly; on the other hand, it absorbs and stores the electrolyte, thereby realizing ion conduction. Furthermore, during the discharge process of the alkaline zinc-manganese battery, the ion conduction distance is shortened, the electrochemical concentration polarization is reduced, and the current output by the battery and the voltage during battery discharge are increased.

[0034] Since the ion-conducting coating itself is non-conductive and colloidal and porous-free, and its viscosity at 20°C is 800 mPa·s - 1000 mPa·s, it has excellent barrier properties and can avoid internal short circuits caused by high impurities inside the battery; in addition, since the ion-conducting coating can also absorb and store the electrolyte and can dissolve trace amounts of zinc, it can prevent the generation of zinc dendrites, thereby preventing internal short circuits in alkaline zinc-manganese batteries.

[0035] The solid content in the ion-conducting coating affects the filling performance and liquid-retaining performance of the ion-conducting coating between the positive electrode ring and the separator tube, thereby affecting the ion conduction performance. In one embodiment, the solid content in the ion-conducting coating is 10% - 50%; including but not limited to 10%, 20%, 30%, 40%, or 50%.

[0036] Since polyethylene glycol fibers have more excellent hydrophilicity and alkali resistance compared with polypropylene fibers and natural fibers and can construct more stable ion channels, preferably, the liquid-retaining fibers at least include polyethylene glycol fibers, and the mass fraction of the polyethylene glycol fibers in the liquid-retaining fibers is greater than or equal to 10%.

[0037] In one embodiment, the diameter of the polyethylene glycol fibers is 1 μm - 10 μm, including but not limited to 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm or 10 μm, and the length is below 50 μm, including but not limited to 10 μm, 20 μm, 30 μm, 40 μm or 50 μm; thus, it is more conducive to spraying the ion-conducting coating between the positive electrode ring and the separator tube.

[0038] When the liquid-retaining fibers simultaneously include polyethylene glycol fibers, polypropylene fibers and natural fibers, the ion-conducting coating can better fill the gap between the positive electrode ring and the separator, enabling the gap to retain sufficient electrolyte, and can better improve the current output by the battery and the voltage during battery discharge; in one embodiment, the liquid-retaining fibers include polyethylene glycol fibers, polypropylene fibers and natural fibers, and the mass ratio of the polyethylene glycol fibers, polypropylene fibers to natural fibers is 8:1:1 - 1:5:3.

[0039] Since starch materials have more excellent liquid absorption and retention performance compared with polyacrylic acid, sodium polyacrylate and cellulose and can better achieve ion conduction, in one embodiment, the binder at least includes starch materials, and the mass fraction of the starch materials in the binder is greater than or equal to 10%.

[0040] In one embodiment, the starch includes at least one of modified hydroxypropylated starch, graft copolymerized starch, cationic starch, anionic starch or dialdehyde starch; thus, it can better maintain the electrolyte properties and achieve ion conduction.

[0041] In one embodiment, the cellulose includes at least one of sodium carboxymethyl cellulose, methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose or hydroxyethyl methyl cellulose; thus, it can better maintain the electrolyte properties and achieve ion conduction.

[0042] When the binder simultaneously includes polyacrylic acid, sodium polyacrylate, cellulose and starch materials, the ion-conducting coating absorbs and retains sufficient electrolyte in the gap between the positive electrode ring and the separator paper, and can better improve the current output by the battery and the voltage during battery discharge; in one embodiment, the binder includes polyacrylic acid, sodium polyacrylate, cellulose and starch materials, and the mass ratio of the polyacrylic acid, sodium polyacrylate, cellulose to starch materials is 1:1:4:4 - 4:4:1:1.

[0043] In one embodiment, the solvent is selected from water or an aqueous potassium hydroxide solution.

[0044] In one embodiment, the mass fraction of the solvent in the ion-conducting coating is 50%-90%; including but not limited to 50%, 60%, 70%, 80% or 90%.

[0045] The present invention also provides an alkaline zinc-manganese battery, and an ion-conducting coating as described above is filled between the positive electrode ring and the separator of the alkaline zinc-manganese battery.

[0046] The thickness of the ion-conducting coating affects the output current and discharge voltage during the discharge process of the alkaline zinc-manganese battery. In order to further increase the output current and discharge voltage, in one embodiment, the thickness of the ion-conducting coating is 0.01 mm - 0.3 mm; including but not limited to 0.01 mm, 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm or 0.3 mm. Preferably, the thickness of the ion-conducting coating is 0.02 mm - 0.1 mm.

[0047] The present invention also provides a method for preparing an alkaline zinc-manganese battery, comprising the following steps:

[0048] S10, providing an ion-conducting coating as described above;

[0049] S20, as Figure 1 shown, forming the ion-conducting coating on the inner wall 10 of the positive electrode ring in the semi-finished alkaline zinc-manganese battery, inserting the separator tube, and making the separator tube contact the ion-conducting coating;

[0050] S30, injecting a negative electrode material into the separator tube, inserting the negative electrode into the negative electrode material, and pressing and sealing to obtain the alkaline zinc-manganese battery.

[0051] In step S10, there is no limitation on the method for providing the ion-conducting coating. In one embodiment, the method for providing the ion-conducting coating includes: first mixing the liquid-retaining fiber and the binder to obtain a mixture; then mixing the mixture with the solvent to obtain the ion-conducting coating.

[0052] In step S20, the ion-conducting coating can be formed on the inner wall 10 of the positive electrode ring in the semi-finished alkaline zinc-manganese battery by spraying or brushing. When the ion-conducting coating is formed on the inner wall 10 of the positive electrode ring in the semi-finished alkaline zinc-manganese battery by spraying, the spraying pressure is preferably 0.2 MPa - 0.5 MPa, and the spraying frequency is 0.1 s / time - 1 s / time.

[0053] It should be noted that the viscosity of the ion-conducting coating at 20 °C is 800 mPa·s - 1000 mPa·s, and it can be stably maintained between the positive electrode ring and the separator tube without drying the coating to form a coating.

[0054] In step S30, there are no restrictions on the selection of the negative electrode and the negative electrode material, and the steps of injecting the negative electrode material and inserting the negative electrode into the negative electrode material can follow the conventional process.

[0055] Hereinafter, the ion-conducting coating, the alkaline zinc-manganese battery, and their preparation methods will be further described through the following specific examples.

[0056] Example 1

[0057] Weigh the liquid-retaining fibers and the binder, place them in a dry mixer and stir and mix evenly to obtain a mixed material. Place the mixed material in a container, add pure water and continue to stir and mix to obtain an ion-conducting coating. Among them, the liquid-retaining fibers include polypropylene fibers, polyethylene glycol fibers, and cotton fibers, and the binder includes polyacrylic acid, sodium polyacrylate, sodium carboxymethylcellulose, and grafted starch. The mass ratio of polypropylene fibers, polyethylene glycol fibers, cotton fibers, polyacrylic acid, sodium polyacrylate, sodium carboxymethylcellulose, grafted starch, and pure water is 6∶6∶6∶0.3∶0.3∶0.3∶0.5∶80.6.

[0058] Take the semi-finished LR6 alkaline zinc-manganese battery already loaded with the positive electrode ring, and use a spray gun to quickly and evenly apply the ion-conducting coating on the inner wall 10 of the positive electrode ring. The thickness of the ion-conducting coating is 0.06 mm. Insert a separator tube in the middle of the positive electrode ring so that the separator tube contacts the ion-conducting coating.

[0059] Inject the electrolyte and the negative electrode material into the separator tube, insert the negative electrode into the negative electrode material, and press and seal to obtain the LR6 alkaline zinc-manganese battery.

[0060] Comparative Example 1

[0061] Comparative Example 1 is carried out with reference to Example 1. The difference is that the ion-conducting coating does not include liquid-retaining fibers, and the ion-conducting coating only includes a binder and water. The binder includes polyacrylic acid, sodium polyacrylate, cellulose, and starch materials. The mass ratio of polyacrylic acid, sodium polyacrylate, sodium carboxymethylcellulose, grafted starch, and pure water is 3∶3∶3∶5∶86.

[0062] Comparative Example 2

[0063] Comparative Example 2 is carried out with reference to Example 1. The difference is that the ion-conducting coating does not include a binder, and the ion-conducting coating only includes liquid-retaining fibers and water. The liquid-retaining fibers include polypropylene fibers, polyethylene glycol fibers, and natural fibers. The mass ratio of polypropylene fibers, polyethylene glycol fibers, natural fibers, and pure water is 6∶6∶6∶84.

[0064] Comparative Example 3

[0065] Comparative Example 3 was carried out with reference to Example 1, except that no ion-conducting coating was filled between the positive electrode ring and the separator tube.

[0066] Test Example 1

[0067] The electrical properties of the LR6 alkaline zinc-manganese batteries prepared in Test Example 1 and Comparative Examples 1-3 were tested, and the test results are shown in Table 1:

[0068] Table 1

[0069]

[0070] Example 2

[0071] Example 2 was carried out with reference to Example 1, except that the liquid-retaining fiber did not contain polypropylene fiber. In the ion-conducting coating, the mass ratio of polyethylene glycol fiber, natural fiber, polyacrylic acid, sodium polyacrylate, cellulose, starch material and pure water was 12∶6∶0.3∶0.3∶0.3∶0.5∶80.6.

[0072] Example 3

[0073] Example 3 was carried out with reference to Example 1, except that the liquid-retaining fiber did not contain polypropylene fiber. In the ion-conducting coating, the mass ratio of polyethylene glycol fiber, natural fiber, polyacrylic acid, sodium polyacrylate, cellulose, starch material and pure water was 6∶12∶0.3∶0.3∶0.3∶0.5∶80.6.

[0074] Example 4

[0075] Example 4 was carried out with reference to Example 1, except that the liquid-retaining fiber did not contain polyethylene glycol fiber. In the ion-conducting coating, the mass ratio of polypropylene fiber, natural fiber, polyacrylic acid, sodium polyacrylate, cellulose, starch material and pure water was 12∶6∶0.3∶0.3∶0.3∶0.5∶80.6.

[0076] Example 5

[0077] Example 5 was carried out with reference to Example 1, except that the liquid-retaining fiber did not contain polyethylene glycol fiber. In the ion-conducting coating, the mass ratio of polypropylene fiber, natural fiber, polyacrylic acid, sodium polyacrylate, cellulose, starch material and pure water was 6∶12∶0.3∶0.3∶0.3∶0.5∶80.6.

[0078] Example 6

[0079] Example 6 was carried out with reference to Example 1, except that the liquid-retaining fiber did not contain natural fiber. In the ion-conducting coating, the mass ratio of polypropylene fiber, polyethylene glycol fiber, polyacrylic acid, sodium polyacrylate, cellulose, starch material, and pure water was 12∶6∶0.3∶0.3∶0.3∶0.5∶80.6.

[0080] Example 7

[0081] Example 7 was carried out with reference to Example 1, except that the liquid-retaining fiber did not contain natural fiber. In the ion-conducting coating, the mass ratio of polypropylene fiber, polyethylene glycol fiber, polyacrylic acid, sodium polyacrylate, cellulose, starch material, and pure water was 6∶12∶0.3∶0.3∶0.3∶0.5∶80.6.

[0082] Example 8

[0083] Example 8 was carried out with reference to Example 1, except that the binder did not contain polyacrylic acid. In the ion-conducting coating, the mass ratio of polypropylene fiber, polyethylene glycol fiber, natural fiber, sodium polyacrylate, cellulose, starch material, and pure water was 6∶6∶6∶0.3∶0.3∶0.5∶80.6.

[0084] Example 9

[0085] Example 9 was carried out with reference to Example 1, except that the binder did not contain sodium polyacrylate. In the ion-conducting coating, the mass ratio of polypropylene fiber, polyethylene glycol fiber, natural fiber, polyacrylic acid, cellulose, starch material, and pure water was 6∶6∶6∶0.3∶0.3∶0.5∶80.6.

[0086] Example 10

[0087] Example 10 was carried out with reference to Example 1, except that the binder did not contain cellulose. In the ion-conducting coating, the mass ratio of polypropylene fiber, polyethylene glycol fiber, natural fiber, polyacrylic acid, sodium polyacrylate, starch material, and pure water was 6∶6∶6∶0.3∶0.3∶0.5∶80.6.

[0088] Example 11

[0089] Example 11 was carried out with reference to Example 1, except that the binder did not contain starch material. In the ion-conducting coating, the mass ratio of polypropylene fiber, polyethylene glycol fiber, natural fiber, polyacrylic acid, sodium polyacrylate, cellulose, and pure water was 6∶6∶6∶0.3∶0.3∶0.5∶80.6.

[0090] Example 12

[0091] Example 12 was carried out with reference to Example 1, except that the thickness of the ion-conducting coating was 0.02 mm.

[0092] Example 13

[0093] Example 13 was carried out with reference to Example 1, except that the thickness of the ion-conducting coating was 0.10 mm.

[0094] Test Example 2

[0095] Test Example 2 was carried out with reference to Test Example 1 to test the electrical properties of the LR6 alkaline zinc-manganese batteries prepared in Test Examples 2-13. The test results are shown in Table 2.

[0096] Table 2

[0097]

[0098] All possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0099] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. An ion-conducting coating, characterized in that, the ion-conducting coating comprises liquid-retaining fibers, a binder and a solvent; wherein, the liquid-retaining fibers include at least one of polyethylene glycol fibers, polypropylene fibers or natural fibers, the binder includes at least one of polyacrylic acid, sodium polyacrylate, cellulose or starch, and the mass ratio of the liquid-retaining fibers to the binder is 100:0.1 - 100:5, and the viscosity of the ion-conducting coating at 20 °C is 800 mPa·s - 1000 mPa·s.

2. The ion-conducting coating according to claim 1, characterized in that, the solid content in the ion-conducting coating is 10% - 50%.

3. The ion-conducting coating according to claim 1, characterized in that, the liquid-retaining fibers at least include polyethylene glycol fibers, and the mass fraction of the polyethylene glycol fibers in the liquid-retaining fibers is greater than or equal to 10%.

4. The ion-conducting coating according to claim 3, characterized in that, the liquid-retaining fibers include polyethylene glycol fibers, polypropylene fibers and natural fibers, and the mass ratio of the polyethylene glycol fibers, the polypropylene fibers to the natural fibers is 8:1:1 - 1:5:

3.

5. The ion-conducting coating according to any one of claims 1 - 4, characterized in that, the binder at least includes starch, and the mass fraction of the starch in the binder is greater than or equal to 10%.

6. The ion-conducting coating according to claim 5, characterized in that, the binder includes polyacrylic acid, sodium polyacrylate, cellulose and starch, and the mass ratio of the polyacrylic acid, the sodium polyacrylate, the cellulose to the starch is 1:1:4:4 - 4:4:1:

1.

7. The ion-conducting coating according to any one of claims 1 - 4, characterized in that, the ion-conducting coating further satisfies at least one of the following conditions: (1) When the liquid-retaining fibers include polyethylene glycol fibers, the diameter of the polyethylene glycol fibers is 1 μm - 10 μm and the length is below 50 μm; (2) When the binder includes cellulose, the cellulose includes at least one of sodium carboxymethyl cellulose, methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose or hydroxyethyl methyl cellulose; (3) When the binder includes starch, the starch includes at least one of modified hydroxypropylated starch, graft copolymerized starch, cationic starch, anionic starch or dialdehyde starch; (4) The solvent is selected from water or an aqueous potassium hydroxide solution; (5) The mass fraction of the solvent in the ion-conducting coating is 30% - 90%.

8. An alkaline zinc-manganese battery, characterized in that, the ion-conducting coating according to any one of claims 1 - 7 is filled between the positive electrode ring and the separator of the alkaline zinc-manganese battery.

9. The alkaline zinc-manganese battery according to claim 8, characterized in that, the thickness of the ion-conducting coating is 0.01 mm - 0.3 mm.

10. A method for preparing an alkaline zinc-manganese battery, characterized in that, comprises the following steps: Provide an ion-conducting coating as described in any one of claims 1-7; Form the ion-conducting coating on the inner wall of the positive electrode ring in the semi-finished product of the alkaline zinc-manganese battery, insert a separator tube, and bring the separator tube into contact with the ion-conducting coating; Inject a negative electrode material into the separator tube, insert a negative electrode into the negative electrode material, and press and seal to obtain an alkaline zinc-manganese battery.

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