Zinc ion battery positive electrode material, preparation method thereof, positive electrode plate and zinc ion battery

Abstract

The invention relates to the field of zinc ion batteries, and discloses a zinc ion battery positive electrode material, a preparation method thereof, a positive electrode plate and a zinc ion battery. According to the zinc ion battery positive electrode material with V5Se8 compounded with the specific-content carbon nanotubes, a simple and efficient one-step high-temperature sintering synthesis method is adopted, the content of the carbon nanotubes in black powder obtained after sintering is controlled to be 1.5%-5%, the long cycle performance of a water-based zinc ion battery can be remarkably improved, and the service life of the water-based zinc ion battery is prolonged. The problems of poor conductivity and poor cycling stability when the metal selenide is applied to the aqueous zinc ion battery are solved, an aqueous zinc ion battery positive electrode material system is widened, and further development of a zinc ion battery energy storage technology is promoted.

Description

Technical Field

[0001] The present application relates to the field of zinc ion batteries, and in particular to a zinc ion battery positive electrode material and a preparation method thereof, as well as a positive electrode sheet and a zinc ion battery. Background Art

[0002] With the continuous growth of global energy demand and the implementation of sustainable development strategies, the search for efficient, safe, and low-cost electrochemical energy storage devices has become a top priority. Zinc-ion batteries, as an important energy storage technology, have attracted widespread attention from both scientific research and industry due to their abundant raw materials, low cost, environmental friendliness, and excellent safety. The performance of cathode materials, as the core component of zinc-ion batteries, directly affects the overall performance of the battery, including energy density, cycle stability, and rate capability. Therefore, in-depth research on cathode materials for zinc-ion batteries has important practical significance and broad application prospects.

[0003] Currently, the mainstream research on zinc-ion battery cathode materials is primarily focused on manganese-based oxides and vanadium-based oxides. However, these materials still suffer from issues such as poor conductivity, poor cycling performance due to material dissolution during cycling, poor rate performance, and severe capacity decay. Therefore, developing new cathode materials for aqueous zinc-ion batteries with high conductivity, high rate capability, and long-term cycling stability will help broaden the cathode material portfolio for aqueous zinc-ion batteries and promote the further development of zinc-ion battery energy storage technology. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a zinc ion battery positive electrode material and a preparation method thereof, so that the zinc ion battery positive electrode material has extremely high long cycle performance and structural stability;

[0005] Another object of the present application is to provide a positive electrode sheet and a zinc ion battery prepared based on the above-mentioned zinc ion battery positive electrode material.

[0006] In order to solve the above technical problems / achieve the above purposes or at least partially solve the above technical problems / achieve the above purposes, as a first aspect of the present application, a zinc ion battery positive electrode material is provided, including V5Se8 and carbon nanotubes, and the mass percentage of the carbon nanotubes is 1.5-5%.

[0007] As a second aspect of the present application, a method for preparing the positive electrode material is provided, comprising:

[0008] S1. Weigh a V source material, a Se source material, and carbon nanotubes accounting for less than 5% of the total mass according to a molar ratio of V:Se=2:9 and grind them to obtain a mixed powder.

[0009] S2. The mixed powder reacts at high temperature in a protective gas atmosphere to obtain a black powder as the positive electrode material. The black powder obtained after sintering is the positive electrode material.

[0010] Optionally, the V source is selected from one or more of vanadium acetylacetonate, vanadyl acetylacetonate, vanadium pentoxide, ammonium metavanadate, and vanadium chloride, and the Se source is selected from one or more of elemental selenium and selenium dioxide.

[0011] Optionally, the high temperature reaction is carried out at 600-1000° C. for 1-5 hours.

[0012] As a third aspect of the present application, a positive electrode plate is provided, comprising a current collector and a dried slurry coated on a surface of the current collector, wherein the slurry comprises the positive electrode material described in the present application.

[0013] As a fourth aspect of the present application, a zinc ion battery is provided, comprising the positive electrode sheet described in the present application, as well as a negative electrode sheet, a separator and an electrolyte.

[0014] Optionally, the negative electrode plate includes metallic zinc, and the electrolyte includes an aqueous solution of zinc trifluoromethanesulfonate.

[0015] As a fifth aspect of the present application, an electrical device is provided, comprising the zinc ion battery described in the present application, wherein the zinc ion battery provides electrical energy for the electrical device.

[0016] The present application provides a zinc ion battery positive electrode material comprising V5Se8 and a specific content of carbon nanotubes. The material adopts a simple and efficient one-step high-temperature sintering synthesis method. By controlling the content of carbon nanotubes in the black powder obtained after sintering to be within 1.5-5%, the long-cycle performance of aqueous zinc ion batteries can be significantly improved, thereby solving the problems of poor conductivity and poor cycle stability of metal selenides in aqueous zinc ion batteries, broadening the positive electrode material system of aqueous zinc ion batteries, and promoting the further development of zinc ion battery energy storage technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application.

[0018] Figure 1 Shown is the X-ray diffraction pattern of the V5Se8 / 0.04CNT composite material of Example 1;

[0019] Figure 2 Shown is a schematic diagram of the preparation process of the positive electrode material and aqueous zinc ion battery of the present application;

[0020] Figure 3Shown is the X-ray diffraction pattern of the 1V5Se8 material of Comparative Example 1;

[0021] Figure 4 Shown is the X-ray diffraction pattern of the V5Se8 / 0.02CNT composite material of Comparative Example 2;

[0022] Figure 5 Shown is the X-ray diffraction pattern of the V5Se8 / 0.08CNT composite material of Comparative Example 3;

[0023] Figure 6 The V5Se8 / 0.04CNT composite material of Example 1 is used as the positive electrode material of aqueous zinc ion battery at a current density of 5Ag. -1 The cycle performance diagram below;

[0024] Figure 7 The V5Se8 material of comparative example 1 is used as the positive electrode material of aqueous zinc ion battery at a current density of 5Ag. -1 The cycle performance diagram below;

[0025] Figure 8 The V5Se8 / 0.02CNT composite material of Comparative Example 2 is used as the positive electrode material of aqueous zinc ion battery at a current density of 5A. -1 The cycle performance diagram below;

[0026] Figure 9 The V5Se8 / 0.08CNT composite material of Comparative Example 3 is used as the positive electrode material of aqueous zinc ion battery at a current density of 5A. -1 The cycle performance diagram below.

[0027] Figure 10 The commercial V2O5 material of Comparative Example 4 is shown as the positive electrode material of aqueous zinc ion battery at a current density of 5Ag. -1 The cycle performance diagram below;

[0028] Figure 11 The TG thermogravimetric curves of Comparative Examples 1-3 and Example 1 under air atmosphere are shown to quantitatively determine the actual carbon nanotube content in the prepared products. DETAILED DESCRIPTION

[0029] The present application discloses a positive electrode material for a zinc ion battery, a preparation method thereof, a positive electrode sheet, and a zinc ion battery. Those skilled in the art can refer to the contents of this article and appropriately improve the process parameters for implementation. It is particularly important to point out that all similar replacements and modifications are obvious to those skilled in the art, and they are all deemed to be included in this application. The products, preparation methods, positive electrode sheets, and zinc ion batteries described in this application have been described through preferred embodiments. Relevant personnel can obviously modify or appropriately change and combine the products, preparation methods, positive electrode sheets, and zinc ion batteries described herein without departing from the content, spirit, and scope of this application to implement and apply the technology of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0030] It should be noted that, in this document, if relational terms such as "first" and "second", "step 1" and "step 2", and "(1)" and "(2)" appear, they are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including a..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements. At the same time, the embodiments in this application and the features in the embodiments can be combined with each other in the absence of conflict.

[0031] Currently, metal selenide materials are widely used as negative electrode materials in lithium-ion batteries and sodium-ion batteries due to their good structural stability and high theoretical specific capacity, but there are no reports on their use as positive electrode materials in aqueous zinc-ion batteries. 2+ With a larger ionic radius and higher charge density, Zn 2+ The continuous insertion and removal process can easily cause damage to the electrode material, resulting in poor cycle performance. Secondly, the divalent zinc ion battery system has higher requirements for the conductivity of the electrode material, which promotes the 2+ Reversible electron transfer with intercalation and deintercalation. Based on this, the present application improves the conductivity and cycle stability of V5Se8 in aqueous zinc-ion battery systems by performing CNT composite modification on V5Se8 at a specific content.

[0032] In a first aspect of the present application, a zinc ion battery positive electrode material is provided, comprising V5Se8 and carbon nanotubes, wherein the mass percentage of the carbon nanotubes is 1.5-5%.

[0033] In some embodiments of the present application, the mass percentage of the carbon nanotubes is 2-3%; in some other embodiments of the present application, the mass percentage of the carbon nanotubes is 1.5%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 4%, 5%, etc.

[0034] In a second aspect of the present application, a method for preparing the positive electrode material is provided, comprising:

[0035] S1. Weigh V source material, Se source material, and carbon nanotubes accounting for less than 5% of the total mass and grind them in a molar ratio of V:Se = 2:9 to obtain a mixed powder;

[0036] S2. The mixed powder reacts at high temperature in a protective gas atmosphere to obtain a black powder as the positive electrode material. The black powder obtained after sintering is the positive electrode material, wherein the carbon nanotube content is 1.5-5%.

[0037] This application adopts a high-temperature one-step solid-phase method as a whole. Compared with other hydrothermal methods and sol-gel methods, the synthesis method is simpler and more convenient, low-cost, high-yield and can be produced in large quantities.

[0038] In certain embodiments of the present application, the V source is selected from one or more of vanadium acetylacetonate, vanadyl acetylacetonate, vanadium pentoxide, ammonium metavanadate, and vanadium chloride, and the Se source is selected from one or more of elemental selenium and selenium dioxide.

[0039] In some other embodiments of the present application, the V source is 0.696g of vanadium acetylacetonate, the Se source is 0.711g of selenium powder, and the amount of carbon nanotubes is 0.04g respectively. The CNT content in the prepared positive electrode material is 2.84%. Positive electrode materials with other CNT contents can be appropriately added or subtracted based on the amount of 0.04g.

[0040] In certain embodiments of the present application, the high temperature reaction is carried out at 600-1000° C. for 1-5 hours. The temperature of the high temperature reaction may be 600° C., 650° C., 700° C., 750° C., 800° C., 850° C., 900° C., 950° C., or 1000° C., and the reaction time may be 1 hour, 2 hours, 3 hours, 4 hours, or 5 hours.

[0041] In certain embodiments of the present application, the high temperature reaction is heated from room temperature to a predetermined temperature at a heating rate of 1-5°C / min, for example, 1°C / min, 2°C / min, 3°C / min, 4°C / min, 5°C / min, etc.

[0042] In the third aspect of the present application, a positive electrode sheet is provided, comprising a current collector and a dried slurry coated on the surface of the current collector, wherein the slurry comprises the positive electrode material described in the present application. In certain embodiments of the present application, the current collector comprises metal foil, metal mesh, carbon paper, such as aluminum foil, copper foil, stainless steel mesh, etc. After the slurry is coated on the surface of the current collector, the solvent is evaporated after drying to obtain the positive electrode sheet; in other embodiments of the present application, the slurry comprises the positive electrode material described in the present application, a conductive agent, a binder, and a solvent, wherein the conductive agent, binder, and solvent can be conventional substances in the battery field, such as conductive carbon black, PVDF, styrene-butadiene rubber, NMP, etc. In other embodiments of the present application, the mass ratio of the positive electrode material, conductive agent, and binder is (7-9):(0.5-2):(0.5-1).

[0043] In the fourth aspect of the present application, a zinc ion battery is provided, comprising the positive electrode sheet described in the present application, as well as the negative electrode sheet, a diaphragm and an electrolyte. The zinc ion battery includes but is not limited to a soft pack battery, a button cell, a half cell or a full cell, etc. In certain embodiments of the present application, the zinc ion battery is a button cell, which includes the positive electrode sheet described in the present application, and also includes positive and negative electrode shells, an electrolyte, a diaphragm, a zinc sheet (as a negative electrode sheet), a shrapnel and a gasket, etc. Wherein, the diaphragm is glass fiber, and the electrolyte is a 3M Zn(CF3SO3)2 (zinc trifluoromethanesulfonate) aqueous solution.

[0044] In a fifth aspect of the present application, an electrical device is provided, comprising the zinc ion battery described herein, wherein the zinc ion battery provides electrical energy to the electrical device. The electrical device may be any device or equipment driven by the zinc ion battery, including but not limited to electric vehicles, electric vehicles, self-balancing scooters, flatbed vehicles, aircraft, lighting equipment, household appliances, and the like.

[0045] In the comparative experiments provided in this application, unless otherwise specified, other experimental conditions, materials, etc. were kept consistent except for the differences noted in each group, so as to provide comparability. The experimental materials and reagents used in the examples were all available from commercial sources unless otherwise specified.

[0046] The following further describes a zinc ion battery positive electrode material and a preparation method thereof, as well as a positive electrode sheet and a zinc ion battery provided in this application.

[0047] Example 1:

[0048] Preparation of V5Se8 / 0.04CNT composite material: Weigh 0.696g of vanadium acetylacetonate, 0.711g of selenium powder and 0.04g of carbon nanotubes (CNT) and grind them in a mortar for 30 minutes to mix them evenly. Secondly, put the mixed powder into a porcelain boat crucible, compact it appropriately, and then place it in a tube furnace for high-temperature reaction under a nitrogen atmosphere. The reaction temperature is 800℃, and the heating rate is 2℃ / min. After keeping warm for two hours, cool it to room temperature with the furnace to obtain a black powder, which is the V5Se8 / 0.04CNT material. After grinding it, its phase composition is verified by XRD detection. The X-ray diffraction pattern is shown in Figure 1 The diffraction peaks of the X-ray diffraction pattern (XRD) of the V5Se8 / 0.04CNT composite material prepared in this example correspond to those of the standard card PDF#18-1455, and no other impurity peaks are present, indicating that the material is of high purity. Due to the low content of CNTs, no diffraction peaks were detected in the XRD test.

[0049] Electrode preparation: V5Se8 / 0.04CNT was thoroughly mixed with conductive carbon black (SP) and polyvinylidene fluoride (PVDF) in an appropriate amount of N-methyl-2-pyrrolidone (NMP) at a mass ratio of 7:2:1. The resulting slurry was evenly coated on a 400-mesh stainless steel mesh and then vacuum-dried at 60°C for 12 hours to obtain a V5Se8 / 0.04CNT electrode.

[0050] Assemble aqueous zinc ion batteries: Use metallic zinc as the negative electrode, V5Se8 / 0.04CNT electrode as the positive electrode, 3M zinc trifluoromethanesulfonate Zn(CF3SO3)2 aqueous solution as the electrolyte, and glass fiber as the separator to assemble CR-2025 button cells in air. See the process diagram for details. Figure 2 .

[0051] Comparative Example 1:

[0052] Preparation of V5Se8 material: Weigh 0.696g of vanadium acetylacetonate and 0.711g of selenium powder and grind them in a mortar for 30 minutes to mix them evenly. Then, put the mixed powder into a porcelain boat crucible, compact it appropriately, and place it in a tube furnace for high-temperature reaction under a nitrogen atmosphere. The reaction temperature is 800℃, and the heating rate is 2℃ / min. After keeping warm for two hours, cool it to room temperature with the furnace to obtain a black powder, which is the V5Se8 material. After grinding it, its phase composition is verified by XRD detection. The X-ray diffraction pattern is shown in Figure 3 The diffraction peaks of the X-ray diffraction pattern (XRD) of the V5Se8 material prepared in this example correspond to the standard card PDF#18-1455.

[0053] Electrode preparation: V5Se8 material, conductive carbon black (SP) and polyvinylidene fluoride (PVDF) were thoroughly mixed in an appropriate amount of N-methyl-2-pyrrolidone (NMP) at a mass ratio of 7:2:1. The obtained slurry was evenly coated on a 400-mesh stainless steel mesh and then vacuum-dried at 60°C for 12 hours to obtain a V5Se8 electrode.

[0054] Assemble aqueous zinc-ion batteries: Use metallic zinc as the negative electrode, V5Se8 electrode as the positive electrode, 3M zinc trifluoromethanesulfonate Zn(CF3SO3)2 aqueous solution as the electrolyte, glass fiber as the separator, and assemble CR-2025 button batteries in air.

[0055] Comparative Example 2:

[0056] Preparation of V5Se8 / 0.02CNT composite material: Weigh 0.696g of vanadium acetylacetonate, 0.711g of selenium powder and 0.02g of carbon nanotubes (CNT) and grind them in a mortar for 30 minutes to mix them evenly. Secondly, put the mixed powder into a porcelain boat crucible and compact it appropriately. Then place it in a tube furnace and react at high temperature under a nitrogen atmosphere. The reaction temperature is 800℃ and the heating rate is 2℃ / min. After keeping warm for two hours, cool it to room temperature with the furnace to obtain a black powder, which is the V5Se8 / 0.02CNT material. After grinding, verify its phase composition through XRD detection. The X-ray diffraction pattern is shown in Figure 4 The diffraction peaks of the X-ray diffraction pattern (XRD) of the V5Se8 / 0.02CNT composite material prepared in this example correspond to those of the standard card PDF#18-1455, and no other impurity peaks are present, indicating that the material is of high purity. Due to the low content of CNT, no diffraction peaks were detected in the XRD test.

[0057] Electrode preparation: V5Se8 / 0.02CNT material was thoroughly mixed with conductive carbon black (SP) and polyvinylidene fluoride (PVDF) in an appropriate amount of N-methyl-2-pyrrolidone (NMP) at a mass ratio of 7:2:1. The obtained slurry was evenly coated on a 400-mesh stainless steel mesh and then vacuum-dried at 60°C for 12 hours to obtain a V5Se8 / 0.02CNT electrode.

[0058] Assemble aqueous zinc-ion batteries: Use metallic zinc as the negative electrode, V5Se8 / 0.02CNT electrode as the positive electrode, 3M zinc trifluoromethanesulfonate Zn(CF3SO3)2 aqueous solution as the electrolyte, glass fiber as the separator, and assemble CR-2025 button batteries in air.

[0059] Comparative Example 3:

[0060] Preparation of V5Se8 / 0.08CNT composite material: Weigh 0.696g of vanadium acetylacetonate, 0.711g of selenium powder and 0.08g of carbon nanotubes (CNT) and grind them in a mortar for 30 minutes to mix them evenly. Secondly, put the mixed powder into a porcelain boat crucible, compact it appropriately, and then place it in a tube furnace for high-temperature reaction under a nitrogen atmosphere. The reaction temperature is 800℃, and the heating rate is 2℃ / min. After keeping warm for two hours, cool it to room temperature with the furnace to obtain a black powder, which is the V5Se8 / 0.08CNT material. After grinding it, its phase composition is verified by XRD detection. The X-ray diffraction pattern is shown in Figure 5 The diffraction peaks of the X-ray diffraction pattern (XRD) of the V5Se8 / 0.08CNT composite material prepared in this example correspond to those of the standard card PDF#18-1455, and no other impurity peaks are present, indicating that the material is of high purity. Due to the low content of CNTs, no diffraction peaks were detected in the XRD test.

[0061] Electrode preparation: V5Se8 / 0.08CNT material was thoroughly mixed with conductive carbon black (SP) and polyvinylidene fluoride (PVDF) in an appropriate amount of N-methyl-2-pyrrolidone (NMP) at a mass ratio of 7:2:1. The obtained slurry was evenly coated on a 400-mesh stainless steel mesh and then vacuum-dried at 60°C for 12 hours to obtain a V5Se8 / 0.08CNT electrode.

[0062] Assemble aqueous zinc-ion batteries: Use metallic zinc as the negative electrode, V5Se8 / 0.08CNT electrode as the positive electrode, 3M zinc trifluoromethanesulfonate Zn(CF3SO3)2 aqueous solution as the electrolyte, glass fiber as the separator, and assemble CR-2025 button batteries in air.

[0063] Comparative Example 4:

[0064] Electrode preparation: Commercial V2O5 material was thoroughly mixed with conductive carbon black (SP) and polyvinylidene fluoride (PVDF) in a mass ratio of 7:2:1 in an appropriate amount of N-methyl-2-pyrrolidone (NMP). The resulting slurry was evenly coated on a 400-mesh stainless steel mesh and then vacuum-dried at 60°C for 12 hours to obtain a V2O5 electrode.

[0065] Assemble aqueous zinc-ion batteries: Use metallic zinc as the negative electrode, commercial V2O5 electrode as the positive electrode, 3M zinc trifluoromethanesulfonate Zn(CF3SO3)2 aqueous solution as the electrolyte, glass fiber as the separator, and assemble CR-2025 button batteries in air.

[0066] Experimental example:

[0067] The CR-2025 button batteries of Example 1 and Comparative Examples 1-4 were subjected to electrochemical performance tests using a Neware battery testing system (CT4008T). The results are shown in Figure 6-10 and Summary Table 1;

[0068] Table 1

[0069]

[0070] Note: “ / ” indicates that the positive electrode material collapsed, was damaged, or the vanadium element dissolved, making it impossible to continue testing.

[0071] According to the results of the figures and Table 1 above, it can be seen intuitively that the capacity retention rate of Example 1 at 1000 cycles is slightly lower than that of Comparative Examples 1-3. The positive electrode material of the V2O5 electrode of Comparative Example 4 collapses and is damaged when the cycle reaches 1000, and subsequent tests cannot be performed, indicating that it does not have long-cycle performance, even though it has a capacity retention rate test result of up to 260% at 500 cycles (increased from the initial 48 mAh / g to 125 mAh / g);

[0072] However, as the number of cycles increased, the advantage of the positive electrode material of Example 1 in long-term cycle performance gradually became apparent. After 2500 cycles, the capacity retention rate of the positive electrode material of Example 1 was higher than that of the other groups. After more than 5000 cycles, the capacity retention rate of the positive electrode material of Example 1 was significantly higher than that of the positive electrode material of Comparative Example 2, and the positive electrode materials of Comparative Examples 1 and 3 had already been damaged and could not be further tested. By 9500 cycles, except for the group of Example 1, which still had a capacity retention rate of 65%, the positive electrode materials of the other groups had all been damaged and could not be further tested. The above results fully demonstrate that the positive electrode materials provided by this application are particularly suitable for improving the long-term cycle performance and structural stability of zinc-ion batteries.

[0073] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A zinc ion battery cathode material, characterized in that The invention comprises V5Se8 and carbon nanotubes, wherein the mass percentage of the carbon nanotubes is 1.5-5%.

2. The method for preparing the positive electrode material according to claim 1, wherein: include: S1. Weigh V source material, Se source material, and carbon nanotubes accounting for less than 5% of the total mass and grind them in a molar ratio of V:Se = 2:9 to obtain a mixed powder; S2. The mixed powder reacts at high temperature in a protective gas atmosphere to obtain a black powder as the positive electrode material. The black powder obtained after sintering is the positive electrode material.

3. The preparation method according to claim 2, characterized in that The V source is selected from one or more of vanadium acetylacetonate, vanadyl acetylacetonate, vanadium pentoxide, ammonium metavanadate, and vanadium chloride, and the Se source is selected from one or more of elemental selenium and selenium dioxide.

4. The preparation method according to claim 2, characterized in that The high temperature reaction is carried out at 600-1000° C. for 1-5 hours.

5. A positive electrode plate, characterized in that: The invention comprises a current collector and a dried slurry coated on the surface of the current collector, wherein the slurry comprises the positive electrode material according to claim 1.

6. A zinc ion battery, characterized in that: The invention comprises the positive electrode sheet as claimed in claim 5, as well as a negative electrode sheet, a separator and an electrolyte.

7. The zinc ion battery according to claim 6, wherein The negative electrode plate includes metallic zinc.

8. The zinc ion battery according to claim 6, wherein The electrolyte includes an aqueous solution of zinc trifluoromethanesulfonate.

9. An electrical device, characterized in that: The zinc ion battery comprises the zinc ion battery according to any one of claims 6 to 8, wherein the zinc ion battery provides electrical energy for the electrical equipment.

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