Catalytic organic nano sodium supplementing agent for sodium ion battery, positive electrode material and battery

Abstract

The invention discloses a sodium ion battery metal oxide catalysis organic nanometer sodium supplement agent, a positive electrode material and a battery, wherein the formula comprises the following components in percentage by mass: 0.5-1% of organic micron sodium salt, 0.01-0.5% of conductive material and 0.1-50% of metal oxide, and the particle size of the organic micron sodium salt is 200-500 microns. The metal oxide catalyzed organic nano sodium supplement for the sodium-ion battery can remarkably reduce the decomposition potential of a sodium supplement composite material, and improve the charge-discharge capacity, the first-circle coulombic efficiency and the cycle stability of the high-voltage sodium-ion battery.

Description

Technical Field

[0001] The present invention relates to the field of sodium ion battery positive electrode materials, and in particular to a sodium ion battery metal oxide catalyzed organic nano sodium supplement, a positive electrode material and a battery. Background Art

[0002] Sodium-ion batteries (SIBs) are considered the most promising next-generation energy storage device due to their widespread global distribution and high crustal abundance. They have attracted attention due to their low cost and wide availability of materials. Currently, the most commercially promising cathode materials for high-voltage SIBs are primarily layered oxides. In SIBs, Na+ from the cathode migrates and irreversibly reacts with the solid electrolyte interface (SEI) on the anode surface. This process significantly reduces the available active sodium source. Consequently, the initial Coulombic efficiency (ICE) and energy density of SIBs are significantly affected, posing a challenge to their development and widespread application.

[0003] To balance the consumption of active sodium, a common practice is to add an excess of cathode material to the full battery. However, this approach significantly reduces the utilization efficiency of the cathode material and the overall energy density of the battery. Therefore, it is imperative to address the challenge of irreversible loss of sodium, the active material in sodium-ion batteries.

[0004] Currently, there are three common methods for improving the first-cycle coulombic efficiency and capacity of sodium-ion batteries. The first is to directly contact a sodium sheet with the sodium-ion battery's negative electrode to form a SEI film, and then use this negative electrode to assemble the battery to improve the capacity and coulombic efficiency of the sodium-ion battery. However, sodium is highly reactive and easily reacts with water in the air, making this method unsuitable for widespread commercial use. The second is inorganic metal sodium salt sodium supplements. This type of sodium supplement can moderately improve the capacity of the sodium-ion battery, but a large amount of residual material remains after decomposition, reducing the mass density of the sodium-ion battery and preventing large-scale use in automotive sodium-ion batteries. The third is organic micron sodium salt sodium supplements. After decomposition, the sodium is released as ions. During the battery formation process, the carbon and hydrogen in the organic matter are removed from the battery as gas. This has little impact on the mass density and volume density of the battery, making it suitable for use in the field of automotive sodium-ion batteries.

[0005] Although the current sodium supplements also use organic sodium salts as sodium supplements, their decomposition potential is still too high to meet the application requirements.

[0006] For example, XU M, LIU M, YANG Z, et al. Research Progress on Presodiation Strategies for High Energy Sodium-Ion Batteries[J]. Acta Physico ChimicaSinica, 2022, 0(0): 2210043, which added Na2C6H2O6 as a sodium supplement, had a decomposition voltage of 3.98 V and a low capacity of 265 mAh / g. Summary of the Invention

[0007] To solve the above problems, the present invention aims to provide a sodium ion battery metal oxide catalyzed organic nano sodium supplement, a positive electrode material and a battery. The sodium ion battery metal oxide catalyzed organic nano sodium supplement can significantly reduce the decomposition potential of the sodium supplement composite material, thereby improving the charge and discharge capacity, first-cycle coulomb efficiency and cycle stability of the high-voltage sodium ion battery.

[0008] The present invention is achieved through the following technical solutions:

[0009] A metal oxide-catalyzed organic nano-sodium supplement for sodium ion batteries (SIBs) comprises a 0.5-1% by weight organic sodium salt, a 0.01-0.5% by weight conductive material, and a 0.1%-50% by weight metal oxide. The organic sodium salt has a particle size of 200-500 microns. Scanning electron microscopy revealed that after recrystallization, the organic sodium salt adsorbed on the conductive material has a grain size of tens of nanometers, and the metal oxide, organic sodium salt, and conductive material are evenly distributed.

[0010] Organic micron sodium salts include one or more of micron sodium formate, micron sodium butyrate, micron sodium propionate, micron sodium malonate, micron sodium butyrate, and micron sodium succinate; conductive materials include conductive carbon, Ketjen black, graphite, graphene, carbon nanotubes, C 60 One or more of .

[0011] Metal oxides include iron oxide (FeO), ferric oxide (Fe2O3), titanium dioxide (TiO2), manganese dioxide (MnO2), manganese trioxide (Mn2O3), cobalt oxide (CoO), cobalt tetroxide (Co3O4), zinc oxide (ZnO), and copper oxide (CuO).

[0012] A positive electrode material includes the aforementioned metal oxide-catalyzed organic nano sodium supplement for sodium ion batteries.

[0013] A battery comprises the positive electrode material as described above.

[0014] A method for preparing a metal oxide-catalyzed organic nanometer sodium supplement for sodium ion batteries is disclosed. The method comprises ball milling a mixed material obtained by recrystallizing an organic micrometer sodium salt and a conductive substance with a metal oxide for a period of time, further recrystallizing the mixed material obtained by recrystallizing the organic micrometer sodium salt and the conductive substance with the metal oxide, or recrystallizing the organic micrometer sodium salt, the conductive substance, and the metal oxide together. The sodium supplement of the present invention utilizes an organic micrometer sodium salt, a conductive substance, and a metal oxide, significantly reducing its corresponding decomposition voltage.

[0015] When implementing, method one

[0016] 1) According to the ratio of different components in the material, mix the organic micron sodium salt and the conductive material at a mass ratio of 0.5-1:0.01-0.5. After mixing evenly, weigh an appropriate amount of material and add it to the beaker. Add deionized water (ultrapure water) to the beaker at a mass ratio of (0.1-20):1. Place the beaker in a magnetic stirrer and stir for 0.1-10 hours. After stirring evenly, ultrasonicate at room temperature for 0.5-3 hours to ensure that the conductive material is fully dispersed in the deionized water and the organic micron sodium salt is completely dissolved in the deionized water (pure water) to obtain a mixed solution. The organic micron sodium salt includes but is not limited to sodium formate, sodium butyrate, sodium propionate, sodium malonate, sodium butyrate, sodium succinate, and the conductive material includes but is not limited to conductive carbon, Ketjen black, graphite, graphene, carbon nanotubes, C 60 .

[0017] 2) Evaporate the mixed solution in step 1) on a magnetic stirrer (magnetic oil bath) at a temperature of 30-260°C until the solution becomes gel-like.

[0018] 3) The gel-like mixed material obtained in step 2) is pre-cooled by adding liquid nitrogen and then freeze-dried in a freeze dryer at a temperature of -50 to -90°C and a pressure of 0.1 MPa until the mixed solution is fully dried. Alternatively, the mixed material can be dried at 25 to 250°C under normal pressure.

[0019] 4) The dried mixed material from step 3) is mixed with a metal oxide at a mass ratio of 0.5-1:0.01-0.5 and ball-milled for 0.1-12 hours to obtain a sodium ion battery metal oxide catalytic organic nano-sodium supplement composite material. The metal oxide includes but is not limited to iron oxide (FeO), ferric oxide (Fe2O3), titanium dioxide (TiO2), manganese dioxide (MnO2), manganese trioxide (Mn2O3), cobalt oxide (CoO), cobalt oxide (Co3O4), zinc oxide (ZnO), and copper oxide (CuO).

[0020] Method 2

[0021] 1) According to the ratio of different components in the material, mix the organic micron sodium salt and the conductive material in a mass ratio of (0.05%-100%): 0.05%-100%. After mixing evenly, weigh an appropriate amount of material and add it to the beaker. Add deionized water (ultrapure water) to the beaker in a mass ratio of (0.1-20):1. Place the beaker in a magnetic stirrer and stir for 0.1-10 hours. After stirring evenly, ultrasonicate at room temperature for 0.5-3 hours to ensure that the conductive material is fully dispersed in the deionized water and the organic micron sodium salt is completely dissolved in the deionized water (pure water) to obtain a mixed solution. The organic micron sodium salt includes but is not limited to sodium formate, sodium butyrate, sodium propionate, sodium malonate, sodium butyrate, sodium succinate, and the conductive material includes but is not limited to conductive carbon, Ketjen black, graphite, graphene, carbon nanotubes, C 60 .

[0022] 2) The mixed solution from step 1) is stirred in a magnetic stirrer (magnetic oil bath), and alcohol is dripped into the mixed solution at a rate of 0.1-10 ml / min using a peristaltic pump, with the mass ratio of the dripped alcohol to the deionized water being 0.1-10.

[0023] 3) The mixed solution obtained in step 2) is evaporated on a magnetic stirrer (magnetic oil bath) at a temperature of 30-260° C. until the solution becomes gel-like.

[0024] 4) The gel-like mixed material obtained in step 3) is pre-cooled by adding liquid nitrogen and then freeze-dried in a freeze dryer at a temperature of -50 to -90°C and a pressure of 0.1 MPa until the mixed solution is fully dry. Alternatively, the mixed material can be dried at 25 to 250°C under normal pressure.

[0025] 5) The dried mixed material from step 4) is mixed with a metal oxide at a mass ratio of 0.5-1:0.001-0.5 and ball-milled for 0.1-12 hours to obtain a sodium ion battery metal oxide catalytic organic nano-sodium supplement composite material. The metal oxide includes but is not limited to iron oxide (FeO), ferric oxide (Fe2O3), titanium dioxide (TiO2), manganese dioxide (MnO2), manganese trioxide (Mn2O3), cobalt oxide (CoO), cobalt oxide (Co3O4), zinc oxide (ZnO), and copper oxide (CuO).

[0026] Method 3

[0027] 1) According to the ratio of different components in the material, the organic micron sodium salt and the conductive material are mixed at a mass ratio of 0.5-1:0.01-0.5. After mixing evenly, weigh an appropriate amount of the material and add it to a beaker. Deionized water (ultrapure water) is added to the beaker at a mass ratio of (0.1-20):1 of the mixed material. Place the beaker in a magnetic stirrer and stir for 0.1-10 hours. After stirring evenly, ultrasonicate at room temperature for 0.5-3 hours to ensure that the conductive material is fully dispersed in the deionized water and the organic micron sodium salt is completely dissolved in the deionized water (pure water) to obtain a mixed solution. The organic micron sodium salt includes but is not limited to sodium formate, sodium butyrate, sodium propionate, sodium malonate, sodium butyrate, and sodium succinate. The conductive material includes but is not limited to conductive carbon, Ketjen black, graphite, graphene, carbon nanotubes, C 60 .

[0028] 2) The mixed solution from step 1) is stirred in a magnetic stirrer (magnetic oil bath), and alcohol is dripped into the mixed solution at a rate of 0.1-10 ml / min using a peristaltic pump, with the mass ratio of the dripped alcohol to the deionized water being 0.1-10.

[0029] 3) Evaporate the mixed solution in step 2) on a magnetic stirrer (magnetic oil bath) at a temperature of 30-260°C until the solution becomes gel-like.

[0030] 4) The gel-like mixed material obtained in step 3) is pre-cooled by adding liquid nitrogen and then freeze-dried in a freeze dryer at a temperature of -50 to -90°C and a pressure of 0.1 MPa until the mixed solution is fully dry. Alternatively, the mixed material can be dried at 25 to 250°C under normal pressure.

[0031] 5) Combine the dried mixed material from step 4) and a metal oxide in a mass ratio of 0.5-1:0.01-0.5 and add them to a beaker. Then, add 0.1-20 times the mass of deionized water (pure water) and stir to obtain a uniform solution. Metal oxides include, but are not limited to, iron oxide (FeO), ferric oxide (Fe2O3), titanium dioxide (TiO2), manganese dioxide (MnO2), manganese trioxide (Mn2O3), cobalt oxide (CoO), cobalt oxide (Co3O4), zinc oxide (ZnO), and copper oxide (CuO).

[0032] 6) Evaporate the mixed solution from step 5) on a magnetic stirrer (magnetic oil bath) at a temperature of 30-260°C until the solution becomes gel-like.

[0033] 7) Precool the gel-like mixed material obtained in step 6) by adding liquid nitrogen and then freeze-drying it in a freeze dryer at a temperature of -50°C to -90°C and a pressure of 0.1 MPa until the mixed solution is fully dry. Alternatively, dry the mixed material at 25°C to 250°C under normal pressure to obtain a metal oxide-catalyzed organic nano-sodium supplement composite material.

[0034] Method 4

[0035] 1) Mix the organic micron sodium salt, conductive material, and metal oxide in a mass ratio of 0.5-1:0.5-1:0.01-0.5:0.001-0.5 according to the ratio of the different components in the material. After mixing evenly, weigh an appropriate amount of the material and add it to a beaker. Add deionized water (ultrapure water) to the beaker in a mass ratio of (0.1-20):1 of the mixed material. Place the beaker in a magnetic stirrer and stir for 0.1-10 hours. After stirring evenly, sonicate at room temperature for 0.5-3 hours to ensure that the conductive material is fully dispersed in the deionized water and the organic micron sodium salt is completely dissolved in the deionized water (pure water) to obtain a mixed solution. The organic micron sodium salt includes but is not limited to sodium formate, sodium butyrate, sodium propionate, sodium malonate, sodium butyrate, and sodium succinate. The conductive material includes but is not limited to conductive carbon, Ketjen black, graphite, graphene, carbon nanotubes, C 60 , metal oxides include but are not limited to iron oxide (FeO), ferric oxide (Fe2O3), titanium dioxide (TiO2), manganese dioxide (MnO2), manganese trioxide (Mn2O3), cobalt oxide (CoO), cobalt tetroxide (Co3O4), zinc oxide (ZnO), and copper oxide (CuO).

[0036] 2) The mixed solution from step 1) is stirred in a magnetic stirrer (magnetic oil bath), and alcohol is dripped into the mixed solution at a rate of 0.1-10 ml / min using a peristaltic pump, with the mass ratio of the dripped alcohol to the deionized water being 0.1-10.

[0037] 3) Evaporate the mixed solution in step 2) on a magnetic stirrer (magnetic oil bath) at a temperature of 30-260°C until the solution becomes gel-like.

[0038] 4) The gel-like mixed material obtained in step 3) is pre-cooled by adding liquid nitrogen and then freeze-dried in a freeze dryer at a temperature of -50°C to -90°C and a pressure of 0.1 MPa until the mixed solution is fully dry. Alternatively, the mixed material is dried at 25°C to 250°C under normal pressure to obtain a metal oxide catalyst, thereby obtaining a metal oxide-catalyzed organic nano-sodium supplement composite material.

[0039] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0040] (1) The metal oxide catalyzed organic nano sodium supplement composite material of the present invention is low in price, simple in process and has good air stability.

[0041] (2) The present invention can significantly reduce the decomposition potential of the sodium supplement composite material, improve the charge and discharge capacity, first-cycle coulomb efficiency, and cycle stability of the high-voltage sodium ion battery.

[0042] (3) The metal oxide catalyzed organic nano sodium supplement composite material prepared by the present invention has excellent performance and can significantly improve the charge and discharge capacity, first-cycle coulomb efficiency, and cycle stability of high-voltage sodium ion batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0044] Figure 1 This is a charge and discharge curve diagram of Example 1 of the present invention.

[0045] Figure 2 This is a charge and discharge curve diagram of Example 3 of the present invention.

[0046] Figure 3 This is a charge and discharge curve diagram of Example 4 of the present invention.

[0047] Figure 4 This is the EDS graph of the metal oxide sodium supplement composite material in Example 1 of the present invention.

[0048] Figure 5 This is the SEM image of Example 1. DETAILED DESCRIPTION

[0049] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0050] Example 1

[0051] 1) Mix 0.5g of organic micronized sodium formate and 0.1g of the conductive Ketjen Black according to the ratio of the different ingredients in the material. After mixing thoroughly, weigh an appropriate amount of the ingredients and add them to a beaker. Add deionized water (ultrapure water) to the beaker at a mass ratio of 20:1. Place the beaker in a magnetic stirrer and stir for 5 hours. After stirring thoroughly, sonicate at room temperature for 3 hours to ensure that the conductive material is fully dispersed in the deionized water and the organic micronized sodium salt is completely dissolved in the deionized water (pure water) to obtain a mixed solution.

[0052] 2) The mixed solution in step 1) was evaporated on a magnetic stirrer (magnetic oil bath) at a temperature of 80-90°C until the solution became gel-like.

[0053] 3) The gel-like mixed material obtained in step 2) is pre-cooled by adding liquid nitrogen and then freeze-dried in a freeze dryer at a temperature of -50 to -90°C and a pressure of 0.1 MPa until the mixed solution is fully dried. Alternatively, the mixed material can be dried at 25 to 250°C under normal pressure.

[0054] 4) 0.06 g of nickel oxide (10 wt %) dried in step 3) was mixed and ball-milled for 5 h to obtain a sodium ion battery metal oxide catalytic organic nano sodium supplement composite material. Figure 1 This is a charge-discharge curve diagram of sodium formate ball-milled with 10 wt % nickel oxide (NiO) as the positive electrode material in Example 1 of the present invention. Figure 4 This is an EDS graph of the metal oxide sodium supplement composite material in Example 1 of the present invention. From the figure, it can be seen that the metal oxide, organic sodium salt and conductive material are evenly distributed. Figure 5 This is the SEM image of Example 1. Scanning electron microscopy revealed that the grain size of the organic sodium salt adsorbed on the conductive material after recrystallization was on the order of tens of nanometers.

[0055] Example 2

[0056] 1) Mix 0.5g of organic micronized sodium formate and 0.1g of the conductive Ketjen Black according to the ratio of the different ingredients in the material. After mixing thoroughly, weigh an appropriate amount of the ingredients and add them to a beaker. Add deionized water (ultrapure water) to the beaker at a mass ratio of 20:1. Place the beaker in a magnetic stirrer and stir for 5 hours. After stirring thoroughly, sonicate at room temperature for 3 hours to ensure that the conductive material is fully dispersed in the deionized water and the organic micronized sodium salt is completely dissolved in the deionized water (pure water) to obtain a mixed solution.

[0057] 2) The mixed solution from step 1) is stirred in a magnetic stirrer (magnetic oil bath), and alcohol is dripped into the mixed solution at a rate of 0.1-10 ml / min using a peristaltic pump, with the mass ratio of the dripped alcohol to the deionized water being 0.1-10.

[0058] 3) Evaporate the mixed solution in step 2) on a magnetic stirrer (magnetic oil bath) at a temperature of 30-260°C until the solution becomes gel-like.

[0059] 4) The gel-like mixed material obtained in step 3) is pre-cooled by adding liquid nitrogen and then freeze-dried in a freeze dryer at a temperature of -50 to -90°C and a pressure of 0.1 MPa until the mixed solution is fully dry. Alternatively, the mixed material can be dried at 25 to 250°C under normal pressure.

[0060] 5) The dried mixed material from step 4) and 0.06 g (10 wt%) were added to a beaker, and then deionized water (pure water) was added at a rate of 0.1-20 times the mass and stirred to obtain a uniformly mixed solution.

[0061] 6) Evaporate the mixed solution from step 5) on a magnetic stirrer (magnetic oil bath) at a temperature of 30-260°C until the solution becomes gel-like.

[0062] 7) Precool the gel-like mixed material obtained in step 6) by adding liquid nitrogen and then freeze-drying it in a freeze dryer at a temperature of -50°C to -90°C and a pressure of 0.1 MPa until the mixed solution is fully dry. Alternatively, dry the mixed material at 25°C to 250°C under normal pressure to obtain a metal oxide-catalyzed organic nano-sodium supplement composite material.

[0063] Example 3

[0064] The only difference from Example 1 is that in step 1) of Example 1, the organic micron sodium salt is changed to 0.5 g of sodium malonate, and the metal oxide is changed to 0.06 g of 10 wt% titanium dioxide (TiO2).

[0065] Example 4

[0066] The only difference from Example 3 is that the metal oxide in step 1) of Example 1 is changed to 0.06 g of 10 wt % copper oxide.

[0067] Example 5

[0068] The only difference from Example 3 is that the metal oxide in step 1) of Example 1 is changed to 0.06 g of 10 wt % nickel oxide.

[0069] Example 6

[0070] The only difference from Example 3 is that the metal oxide in step 1) of Example 1 is changed to 0.06 g of 10 wt % zinc oxide.

[0071] Comparative Example 1

[0072] Similar to Example 1, except that 0.5 g of ordinary sodium formate (with a particle size of more than 500 μm) and 0.1 g of the conductive substance Ketjen Black were mixed, and other steps and conditions were the same. The resulting sodium supplement had a particle size of 100 μm.

[0073] Comparative Example 2

[0074] Similar to Example 1, except that the conductive material Ketjen Black and the metal oxide are first mixed and recrystallized. 4) 0.5 g of the organic micronized sodium formate dried in step 3) is mixed and ball-milled for 0.1-12 hours to obtain a composite material of a metal oxide-catalyzed organic nano-sodium supplement for sodium ion batteries. The resulting sodium supplement has a particle size of tens of microns.

[0075] Comparative Example 3

[0076] Similar to Example 1, except that the catalyst is carbon quantum dot metal oxide and the sodium salt is ordinary sodium formate.

[0077] Experimental part

[0078] Button batteries were prepared using Examples 1-6 and Comparative Examples 1-3, and charge and discharge tests were performed using a rate mode. The results are shown in Table 1. The specific method for preparing the button batteries is as follows:

[0079] 1) The sodium supplements of Examples 1-6 and Comparative Examples 1-3 were added to a binder and mixed in a deaerator to obtain a uniform slurry;

[0080] 2) The slurry obtained in step 2) was coated on aluminum foil and placed in a vacuum oven at 80°C for 12 hours;

[0081] 3) Cutting the product from step 3) into circular electrode pieces with a diameter of 12 mm to obtain the positive electrode material;

[0082] The composite material and sodium supplement agent were coated and the electrode pieces were cut out to prepare the positive electrode. Metallic sodium was used as the negative electrode, glass fiber was used as the separator, and 1M NaClO4 PC / FEC (95:5wt%) solution was used as the electrolyte. A button battery was assembled with a voltage range of 2-4.2 V, and the rate mode was selected for charge and discharge tests.

[0083] Table 1

[0084] sample Platform voltage / V First cycle charging capacity / mAh / g First cycle discharge capacity / mAh / g Example 1 3.85 302.87 11.46 Example 3 3.8 290.99 10.61 Example 5 3.6 177.04 11.60 Example 6 3.7 195.01 12.51 Example 7 3.6 197.02 13.32 Example 8 3.4 205.03 13.73 Comparative Example 1 —— 177.04 11.60 Comparative Example 2 —— 195.01 12.51 Comparative Example 3 —— 197.02 13.32

[0085] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sodium ion battery metal oxide catalyzed organic nano sodium supplement, characterized in that: The formula includes organic micron sodium salt accounting for 0.5-1 by mass, conductive material accounting for 0.01-0.5 by mass, and metal oxide accounting for 0.1%-50% by mass, wherein the particle size of the organic micron sodium salt is 200-500 microns.

2. A sodium ion battery metal oxide catalyzed organic nano sodium supplement according to claim 1, characterized in that, Organic micron sodium salts include one or more of micron sodium formate, micron sodium butyrate, micron sodium propionate, micron sodium malonate, micron sodium butyrate, and micron sodium succinate; conductive materials include conductive carbon, Ketjen black, graphite, graphene, carbon nanotubes, C 60 One or more of .

3. A sodium ion battery metal oxide catalyzed organic nano sodium supplement according to claim 1, characterized in that, The metal oxides include iron oxide, ferric oxide, titanium dioxide, manganese dioxide, manganese trioxide, cobalt oxide, cobalt tetraoxide, zinc oxide, and copper oxide.

4. A positive electrode material, characterized in that It includes the metal oxide catalyzed organic nano sodium supplement for sodium ion batteries as described in claim 1.

5. A battery, characterized in that: Including the positive electrode material as claimed in claim 4.

6. The method for preparing a sodium ion battery metal oxide catalyzed organic nano sodium supplement according to any one of claims 1 to 3, characterized in that: The mixed material obtained by recrystallizing the organic micron sodium salt and the conductive substance is mixed with the metal oxide and ball-milled for a period of time to obtain the obtained product; or the mixed material obtained by recrystallizing the organic micron sodium salt and the conductive substance is recrystallized with the metal oxide again to obtain the obtained product; or the organic micron sodium salt, the conductive substance and the metal oxide are recrystallized together to obtain the obtained product.

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