Fullerene catalyzed iodine positive electrode material, preparation method thereof and zinc-iodine battery

Abstract

This invention discloses a fullerene-catalyzed iodine cathode material and its preparation method, as well as a zinc-iodine battery, belonging to the field of electrode material technology. This invention uses fullerene as a catalyst to form iodine-loaded carbon black (I₂@CB@C) containing the catalyst fullerene, along with activated carbon and elemental iodine. 60 ), then I2@CB@C 60 A fullerene-catalyzed iodine cathode material was obtained by mixing it with a conductive agent and sodium alginate binder. The fullerene catalyst, used as the iodine cathode material, exhibits highly efficient catalytic sites and strong electron acceptance, promoting I-catalysis. ‑ The oxidation process (discharge process) regulates electron transfer in the I2 reduction process, thereby accelerating the kinetic performance of the iodine redox reaction during the zinc-iodine battery cycle.

Description

Technical Field

[0001] This invention belongs to the field of electrode material technology, specifically relating to a method for preparing a fullerene-catalyzed iodine cathode material and a zinc-iodine battery. Background Technology

[0002] The rapid development of renewable energy sources such as wind and solar power has placed extremely high demands on large-scale energy storage technologies to address the intermittent nature of their power generation. Aqueous zinc-iodine batteries, due to their inherent safety and low cost, are considered one of the ideal choices for large-scale energy storage. Aqueous zinc-iodine batteries use water as the electrolyte, fundamentally eliminating the flammability and explosion risks associated with organic electrolytes (such as those used in lithium-ion batteries). Furthermore, zinc and iodine are abundant and inexpensive in the Earth's crust, especially iodine, which is abundant in the ocean, giving zinc-iodine batteries significant advantages in terms of cost and resource sustainability.

[0003] However, the commercial application of aqueous zinc-iodine batteries is limited by the core problems of poor intrinsic conductivity and slow reaction kinetics. During the battery charging and discharging process, elemental iodine (I₂) in the iodine cathode reacts with iodine ions (I₂O₃). - The reaction produces soluble polyiodides (such as I3). - I5 - These polyiodides diffuse across the separator to the zinc anode side, causing not only the loss of active material and self-discharge of the battery, but also corrosion of the zinc anode, resulting in rapid capacity decay and shortened cycle life. Furthermore, iodine and its discharge products have very low intrinsic electronic conductivity (approximately 10⁻⁶). -6 S cm -1 ~10 -9 S cm -1 This limits the reactivity of the electrode, resulting in slow reaction kinetics and poor rate performance. Summary of the Invention

[0004] To address the technical problems of active material loss, poor intrinsic conductivity of iodine and its discharge products, and slow reaction kinetics caused by the formation of polyiodides at the iodine cathode during the charging and discharging process of existing zinc-iodine batteries, this invention provides an iodine-loaded carbon black (I2@CB@C) containing fullerenes. 60 Fullerene-catalyzed iodine cathode material obtained by mixing with conductive agents and binders.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows.

[0006] The first objective of this invention is to provide a fullerene-catalyzed iodine cathode material, which is obtained by mixing fullerene-containing iodine-loaded carbon black, a conductive agent, and a binder. The fullerene-containing iodine-loaded carbon black is formed by mixing fullerene as a catalyst with activated carbon and elemental iodine, thereby sublimating the iodine and embedding it into the pores of the activated carbon.

[0007] The fullerene-containing iodine-loaded carbon black accounts for 2% to 20% of the total mass.

[0008] Insufficient fullerene content leads to insufficient catalytic activity and limited improvement in the redox reaction kinetics of iodine, resulting in minimal improvement in battery capacity, rate performance, and cycle stability. Excessive fullerene content may increase internal electrode contact resistance. Furthermore, fullerenes themselves have generally low conductivity, which can actually reduce electron conduction efficiency.

[0009] A second objective of this invention is to provide a method for preparing a fullerene-catalyzed iodine cathode material, comprising the following steps: After grinding and premixing activated carbon and elemental iodine, fullerene is added and ground. The mixture is then heated to sublimate the iodine and embed it into the pores of the activated carbon, thus obtaining iodine-loaded carbon black containing fullerene.

[0010] After grinding the conductive agent, binder, and fullerene-containing iodine-loaded carbon black evenly, water is added to obtain an iodine cathode slurry.

[0011] The iodine cathode slurry was coated onto a current collector and dried at room temperature to obtain a fullerene-catalyzed iodine cathode material.

[0012] The conductive agent, binder, and fullerene-containing iodine-loaded carbon black are mixed in water to obtain an iodine cathode slurry.

[0013] The iodine cathode slurry is coated onto a current collector to obtain a fullerene-catalyzed iodine cathode material.

[0014] In a preferred embodiment, the mass ratio of iodine, activated carbon, and fullerene is 10:6-9:1-4.

[0015] In a preferred embodiment, the mass ratio of the fullerene-containing iodine-loaded carbon black, the conductive agent, and the binder is 7-8:1-2:1.

[0016] In a preferred embodiment, the heating conditions are: heating at 80℃~150℃ for 4h~10h.

[0017] In a preferred embodiment, the concentration of the fullerene-containing iodine-loaded carbon black in the iodine cathode slurry is 140 mg / mL.

[0018] In a preferred embodiment, the conductive agent is Ketjen black, acetylene black, carbon nanotubes, or superconducting carbon black; the binder is sodium alginate.

[0019] In one preferred embodiment, the activated carbon has a specific surface area of ​​1600 m². 2 / g~1900m 2 / g, with a particle size of 6μm~9μm.

[0020] In a preferred embodiment, the current collector is a stainless steel mesh, a titanium mesh, or graphite paper.

[0021] A third objective of this invention is to provide a zinc-iodine battery comprising an iodine cathode material catalyzed by fullerene as described in claim 1 as the cathode.

[0022] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a fullerene-catalyzed iodine cathode material. Using fullerene as a catalyst, it forms a fullerene-containing iodine-loaded carbon black with activated carbon and elemental iodine. This carbon black is then mixed with a conductive agent and a binder to obtain the fullerene-catalyzed iodine cathode material. The fullerene-catalyzed iodine cathode material prepared by this invention utilizes fullerene, a carbon nanomaterial with a zero-dimensional spherical π-conjugated system, which possesses strong electron-accepting ability. When applied to the cathode of a zinc-iodine battery, it can promote the absorption of iodine. - The oxidation process (discharge process) regulates the electron transfer in the I2 reduction process, accelerating the iodine redox reaction (I - By improving the kinetics of I2, the conversion efficiency of active materials is enhanced, thereby increasing the discharge capacity of zinc-iodine batteries containing iodine cathode materials catalyzed by fullerenes. This solves the technical problems of active material loss caused by polyiodides generated by the iodine cathode during the charging and discharging process of existing zinc-iodine batteries, as well as the poor intrinsic conductivity of iodine and its discharge products and slow reaction kinetics. Attached Figure Description

[0023] Figure 1 The present invention provides C containing different proportions of fullerenes in Application Examples 1 and 2. 60 Cyclic voltammetry (CV) curves of zinc-iodine batteries with iodine cathode material.

[0024] Figure 2 Example 1 of the present invention contains fullerene C 60 Zinc-iodine batteries with iodine cathodes and their applications: Comparative Example 1 (without fullerene C) 60 Comparison of the cycle performance of zinc-iodine batteries with iodine cathode at 2C (iodine loading -2mg).

[0025] Figure 3 Example 1 of the present invention contains fullerene C 60 Zinc-iodine batteries with iodine cathodes and their applications: Comparative Example 1 (without fullerene C) 60 Comparison of cycle performance of zinc-iodine batteries with iodine cathode at 10C (iodine loading -2mg).

[0026] Figure 4 The fullerene-containing C prepared in Example 1 of this invention 60 Zinc-iodine batteries with iodine cathodes and the application of Comparative Example 1: Fullerene-free C 60A comparison of the cyclic voltammetry (CV) curves and corresponding Tafel curves of a zinc-iodine battery with an iodine cathode. Figure a shows the fullerene-containing C2O3 prepared in Example 1. 60 Zinc-iodine batteries with iodine cathodes and the application of Comparative Example 1: Fullerene-free C 60 Figure b shows the cyclic voltammetry (CV) curves of a zinc-iodine battery with an iodine cathode; Figure b is a comparison of its corresponding Tafel curves.

[0027] Figure 5 For the application of the fullerene-containing C prepared in Example 1 60 Zinc-iodine batteries with iodine cathodes and the application of Comparative Example 1: Fullerene-free C 60 Electrochemical impedance spectroscopy (EIS) testing of zinc-iodine batteries with iodine cathode. Detailed Implementation

[0028] To enable those skilled in the art to better understand and implement the technical solutions of this invention, the invention will be further described below with reference to specific embodiments and accompanying drawings. Unless otherwise specified, all reagents used in this invention are commercially available, and all methods used are conventional techniques in the art.

[0029] Aqueous zinc-iodine batteries are considered an ideal choice for large-scale energy storage due to their high intrinsic safety and low cost. Zinc and iodine are abundant and inexpensive in the Earth's crust, especially iodine, which is abundant in the ocean, giving zinc-iodine batteries significant advantages in terms of cost and resource sustainability. However, the commercial application of aqueous zinc-iodine batteries is limited by two core issues: poor intrinsic conductivity and slow reaction kinetics. During the battery charging and discharging process, elemental iodine (I₂) in the iodine cathode reacts with iodine ions (I₂O₃). - The reaction produces soluble polyiodides (such as I3). - I5 - These polyiodides diffuse across the separator to the zinc anode side, causing not only the loss of active material and self-discharge of the battery, but also corrosion of the zinc anode, resulting in rapid capacity decay and shortened cycle life. Secondly, iodine and its discharge products have very low intrinsic electronic conductivity (approximately 10). -6 S cm -1 ~10 -9 S cm -1 This limits the electrode's reactivity, resulting in poor rate performance. To address these issues, this invention provides a method for preparing a fullerene-catalyzed iodine cathode material and a zinc-iodine battery.

[0030] The technical solution of the present invention will be analyzed in detail below.

[0031] This invention provides a fullerene-catalyzed iodine cathode material, which uses fullerene as a catalyst to form iodine-loaded carbon black containing fullerene with activated carbon and elemental iodine, and then mixes it with a conductive agent and a binder to obtain the fullerene-catalyzed iodine cathode material.

[0032] In the above technical solution, fullerene C is selected. 60 Fullerene C360 is used as a catalyst for the iodine cathode in zinc-iodine batteries. 60 As a carbon nanomaterial with a zero-dimensional spherical π-conjugated system, it possesses strong electron-accepting ability. Its application in the cathode of zinc-iodine batteries can promote Ig... - The oxidation process (discharge process) regulates the electron transfer in the I2 reduction process, thereby accelerating the iodine redox reaction (I2). - The kinetics of I2 ( / I2) improve the conversion efficiency of active materials, thereby increasing the discharge capacity of zinc-iodine batteries with fullerene-catalyzed iodine cathode materials.

[0033] The technical solution of the present invention will be further illustrated below through the following embodiments and comparative examples. For ease of description, in the following embodiments, fullerene C 60 Abbreviation C 60 .

[0034] Example 1 A method for preparing a fullerene-catalyzed iodine cathode material includes the following steps: S1, containing catalyst fullerene C 60 Preparation of iodine-loaded carbon black: Iodine and activated carbon are placed in a mortar and ground for 2 minutes until fine, then C is added. 60 (Iodine, activated carbon and C) 60 The mass ratio is 10:9:1, that is, C 60 After being thoroughly mixed (5% by weight of the total), the mixture was transferred to a glass sample vial and then placed in a 120°C forced-air drying oven for 6 hours to induce iodine sublimation and embedding into the pores of activated carbon, yielding fullerene C containing the catalyst. 60 Iodine-loaded carbon black, denoted as I2@CB@C 60 .

[0035] S2, Preparation of fullerene-catalyzed iodine cathode material: Weigh out the above I2@CB@C... 60 Ketjen black and binder are added to make the mass ratio of iodine-loaded carbon black, Ketjen black and binder 7:2:1. The mixture is then ground in a mortar for 6 minutes, followed by the addition of deionized water and further grinding for 2 minutes to obtain iodine cathode slurry.

[0036] S3, 8 mg of iodine cathode slurry was scraped and coated onto a stainless steel mesh, then dried at room temperature for 2 hours to obtain fullerene C. 60 Catalytic iodine cathode material.

[0037] Example 2 A method for preparing a fullerene-catalyzed iodine cathode material includes the following steps: S1, containing catalyst fullerene C 60Preparation of iodine-loaded carbon black: Iodine and activated carbon are placed in a mortar and ground for 2 minutes until fine, then C is added. 60 (Iodine, activated carbon and C) 60 The mass ratio is 10:8:2, that is, C 60 After being thoroughly mixed (10% by weight of the total mass), the mixture was transferred to a glass sample vial and then placed in a 120°C forced-air drying oven for 6 hours to induce iodine sublimation and embedding into the pores of activated carbon, thus obtaining fullerene C. 60 Iodine-loaded carbon black, denoted as I2@CB@C 60 .

[0038] S2, Preparation of fullerene-catalyzed iodine cathode material: Weigh out the above I2@CB@C... 60 Ketjen black and binder are added to make the mass ratio of iodine-loaded carbon black, Ketjen black and binder 7:2:1. The mixture is then ground in a mortar for 6 minutes, followed by the addition of deionized water and further grinding for 2 minutes to obtain iodine cathode slurry.

[0039] S3, 8 mg of iodine cathode slurry was scraped and coated onto a stainless steel mesh, then dried at room temperature for 2 hours to obtain fullerene C. 60 Catalytic iodine cathode material.

[0040] Example 3 A method for preparing a fullerene-catalyzed iodine cathode material includes the following steps: S1, containing catalyst fullerene C 60 Preparation of iodine-loaded carbon black: Iodine and activated carbon are placed in a mortar and ground for 2 minutes until fine, then fullerene C is added. 60 (Iodine, activated carbon and C) 60 The mass ratio is 10:6:4, that is, C 60 After being thoroughly mixed (20% by weight of the total), the mixture was transferred to a glass sample vial and then placed in a 120°C forced-air drying oven for 6 hours to induce iodine sublimation and embedding into the pores of activated carbon and fullerene, thus obtaining fullerene C. 60 Iodine-loaded carbon black, denoted as I2@CB@C 60 .

[0041] S2, Preparation of fullerene-catalyzed iodine cathode material: Weigh out the above I2@CB@C... 60 Ketjen black and binder are added to make the mass ratio of iodine-loaded carbon black, Ketjen black and binder 7:2:1. The mixture is then ground in a mortar for 6 minutes, followed by the addition of deionized water and further grinding for 2 minutes to obtain iodine cathode slurry.

[0042] S3, 8 mg of iodine cathode slurry was scraped and coated onto a stainless steel mesh, then dried at room temperature for 2 hours to obtain fullerene C. 60 Catalytic iodine cathode material.

[0043] Comparative Example 1 A type of C-free fullerene 60 The preparation method of the iodine cathode material includes the following steps: S1, Preparation of iodine-loaded carbon black: Activated carbon and elemental iodine in a mass ratio of 1:1 are placed in a mortar and ground for 2 minutes until uniform and fine. The mixture is then transferred to a glass sample bottle and placed in a 120℃ forced-air drying oven for 6 hours to promote the sublimation of iodine and embedding it into the pores of the activated carbon, thus obtaining iodine-loaded carbon black, denoted as I2@CB.

[0044] S2, without fullerene C 60 Preparation of iodine cathode material: Iodine-loaded carbon black I2@CB, Ketjen black, and sodium alginate (SA) binder were weighed separately, with a mass ratio of iodine-loaded carbon black, Ketjen black, and SA of 7:2:1. The mixture was then ground in a mortar for 6 minutes, followed by the addition of deionized water and further grinding for 2 minutes to obtain an iodine cathode slurry. 8 mg of the iodine cathode slurry was scraped onto a stainless steel mesh and dried at room temperature for 2 hours to obtain a fullerene-free C2. 60 Iodine cathode material.

[0045] Application Example 1 The fullerene C prepared in Example 1 60 The catalytic iodine cathode material was placed at the center of the cathode shell, and 50 μL of 2M ZnSO4 electrolyte was added dropwise. A glass fiber separator was then inserted, and another 50 μL of electrolyte was added until it was fully wetted. A zinc foil disc was aligned with the cathode plate and inserted into the battery casing. Gaskets and spring clips were placed, and the battery was sealed using a battery sealing machine to obtain a C-containing product. 60 Zinc-iodine batteries with iodine cathodes.

[0046] Application Example 2 The fullerene C prepared in Example 2 60 The catalytic iodine cathode material was placed at the center of the cathode shell, and 50 μL of 2M ZnSO4 electrolyte was added dropwise. A glass fiber separator was then inserted, and another 50 μL of electrolyte was added until it was fully wetted. A zinc foil disc was aligned with the cathode plate and inserted into the battery casing. Gaskets and spring clips were placed, and the battery was sealed using a battery sealing machine to obtain a C-containing product. 60 Zinc-iodine batteries with iodine cathodes.

[0047] Application Example 3 The fullerene C prepared in Example 3 60 The catalytic iodine cathode material was placed at the center of the cathode shell, and 50 μL of 2M ZnSO4 electrolyte was added dropwise. A glass fiber separator was then inserted, and another 50 μL of electrolyte was added until it was fully wetted. A zinc foil disc was aligned with the cathode plate and inserted into the battery casing. Gaskets and spring clips were placed, and the battery was sealed using a battery sealing machine to obtain a C-containing product. 60 Zinc-iodine batteries with iodine cathodes.

[0048] Application Comparative Example 1 The fullerene-free C prepared in Comparative Example 1 60 The iodine-containing positive electrode material is placed in the center of the positive electrode shell, and 50 μL of 2M ZnSO4 electrolyte is added. A glass fiber separator is then inserted, and another 50 μL of electrolyte is added until it is fully saturated. A zinc foil disc is aligned with the positive electrode and inserted into the battery casing. Gaskets and spring contacts are then placed, and the battery is sealed using a battery sealing machine to obtain a C-free product. 60 Zinc-iodine batteries with iodine cathodes.

[0049] Test 1: Containing different proportions of C 60 Cyclic voltammetry (CV) curves of iodine cathode.

[0050] The C prepared in Application Example 1 60 Zinc-iodine batteries with iodine cathodes and different proportions of C prepared in Application Example 2 60 Zinc-iodine batteries with iodine cathodes at a scan rate of 0.5 mV / s -1 Cyclic voltammetry tests were performed, and the electrodes were allowed to stand for 4 hours before the test to fully wet them.

[0051] CV results are as follows Figure 1 As shown, when C 60 When the addition amount is 5%, the redox peak potential difference is the smallest, the polarization is the lowest, and the peak area is the largest, indicating the highest charge storage capacity; thus, the optimal C is observed. 60 The addition ratio is 5%.

[0052] Test 2: Comparison of the cycle performance of zinc-iodine batteries at 2C.

[0053] The C-containing material prepared in Example 1 was applied. 60 Zinc-iodine batteries with iodine cathodes and C-free batteries prepared in Comparative Example 1 60 Zinc-iodine batteries with iodine cathodes were subjected to long-cycle performance testing at 2C.

[0054] The results are as follows Figure 2 As shown. After 5000 charge-discharge cycles at a 2C rate, the C-containing... 60 The zinc-iodine battery with an iodine cathode has a discharge specific capacity of 117.5 mAh / g, while the battery does not contain C. 60 The discharge specific capacity of a zinc-iodine battery with an iodine cathode is only 103.2 mAh / g.

[0055] Test 3: Comparison of the cycle performance of zinc-iodine batteries at 10C.

[0056] The C-containing material prepared in Example 1 was applied. 60 Zinc-iodine batteries with iodine cathodes and C-free batteries prepared in Comparative Example 1 60 Zinc-iodine batteries with iodine cathodes underwent long-cycle performance testing at 10C. The results are as follows: Figure 3 As shown, C60 Or without C 60 Zinc-iodine batteries with iodine cathodes can stably cycle 10,000 times at a rate increased to 10C, and contain no C. 60 The zinc-iodine battery with an iodine cathode has a specific capacity of 104.1 mAh / g, but contains carbon. 60 The specific capacity of zinc-iodine batteries with iodine cathodes can be increased to 128.6 mAh / g. This indicates that C 60 Through its excellent electron conduction ability and catalytic activity, it can accelerate the reaction of I3. - / I - Or I3 - The redox reaction rate of I₂ increases the conversion efficiency of active substances, making C… 60 The discharge capacity of zinc-iodine batteries with iodine cathodes has been improved.

[0057] Test 4: Cyclic voltammetry (CV) curves of the electrodes.

[0058] The C-containing material prepared in Example 1 was applied. 60 Zinc-iodine batteries with iodine cathodes and C-free batteries prepared in Comparative Example 1 60 Zinc-iodine batteries with iodine cathodes at a scan rate of 0.5 mV / s -1 Cyclic voltammetry tests were performed, and the electrodes were allowed to stand for 4 hours before the test to ensure they were fully wetted. The results are as follows: Figure 4 As shown in a, compare the addition of C. 60 Cyclic voltammetry (CV) curves before and after, C 60 The introduction of C significantly reduced the potential difference (ΔEp) between the oxidation and reduction peaks of iodine, indicating improved reversibility of the electrode reaction and a decrease in the reaction overpotential. This kineticly confirms the presence of C. 60 It exhibits good catalytic activity for the redox reaction of iodine. Furthermore, the Tafel slope curve was obtained, as shown below. Figure 4 As shown in b, C is confirmed. 60 The introduction of makes the slope change from 66mV dec -1 Decrease to 49.4mV dec -1 The two results above consistently indicate that C 60 It effectively lowers the reaction energy barrier and significantly improves the kinetic performance of the iodine oxidation-reduction reaction.

[0059] Test 5: Electrochemical impedance spectroscopy (EIS) test of the electrode.

[0060] The C-containing material prepared in Example 1 was applied. 60 Zinc-iodine batteries with iodine cathodes and C-free batteries prepared in Comparative Example 1 60 The zinc-iodine battery with an iodine cathode was subjected to electrochemical impedance spectroscopy (EIS) testing at frequencies ranging from 10 mHz to 100 Hz. The electrode was allowed to stand for 4 hours before testing to ensure thorough wetting. Results are as follows: Figure 5 As shown, C60 The introduction of [a specific substance] significantly reduces the charge transfer resistance (Rct) of the electrode reaction, which is reflected in the marked reduction in the capacitive arc diameter representing the charge transfer process in the electrochemical impedance spectroscopy. This phenomenon directly confirms that C [a specific substance] [is involved]. 60 As a highly efficient catalyst, it effectively promotes the charge transfer kinetics at the electrode / electrolyte interface by lowering the energy barrier of the iodine redox reaction.

[0061] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. If these modifications and variations fall within the scope of equivalents of this invention, then this invention also intends to include these modifications and variations.

Claims

1. A fullerene-catalyzed iodine cathode material, characterized in that, The fullerene-catalyzed iodine cathode material is obtained by mixing fullerene-containing iodine-loaded carbon black, a conductive agent, and a binder. The fullerene-containing iodine-loaded carbon black is formed by mixing fullerene with activated carbon and elemental iodine, using fullerene as a catalyst, and sublimating the iodine and embedding it into the pores of the activated carbon. The fullerene-containing iodine-loaded carbon black accounts for 2% to 20% of the total mass.

2. The method for preparing the fullerene-catalyzed iodine cathode material according to claim 1, characterized in that, Includes the following steps: After grinding and premixing activated carbon and elemental iodine, fullerene is added and ground. The mixture is then heated to sublimate the iodine and embed it into the pores of the activated carbon, thus obtaining iodine-loaded carbon black containing fullerene. After grinding the conductive agent, binder and the fullerene-containing iodine-loaded carbon black evenly, water is added to obtain an iodine cathode slurry. The iodine cathode slurry was coated onto a current collector and dried at room temperature to obtain a fullerene-catalyzed iodine cathode material.

3. The method for preparing the fullerene-catalyzed iodine cathode material according to claim 2, characterized in that, The mass ratio of iodine, activated carbon, and fullerene is 10:6-9:1-4.

4. The method for preparing the fullerene-catalyzed iodine cathode material according to claim 2, characterized in that, The mass ratio of the fullerene-containing iodine-loaded carbon black, conductive agent, and binder is 7-8:1-2:

1.

5. The method for preparing the fullerene-catalyzed iodine cathode material according to claim 2, characterized in that, The heating conditions are: heating at 80℃~150℃ for 4h~10h.

6. The method for preparing the fullerene-catalyzed iodine cathode material according to claim 2, characterized in that, In the iodine cathode slurry, the concentration of the fullerene-containing iodine-loaded carbon black is 140 mg / mL.

7. The method for preparing the fullerene-catalyzed iodine cathode material according to claim 2, characterized in that, The conductive agent is Ketjen black, acetylene black, carbon nanotubes, or superconducting carbon black; the binder is sodium alginate.

8. The method for preparing the fullerene-catalyzed iodine cathode material according to claim 2, characterized in that, The specific surface area of ​​the activated carbon is 1600 m². 2 / g~1900m 2 / g, with a particle size of 6μm~9μm.

9. The method for preparing the fullerene-catalyzed iodine cathode material according to claim 2, characterized in that, The current collector is made of stainless steel mesh, titanium mesh, or graphite paper.

10. A zinc-iodine battery, characterized in that, This includes using the iodine cathode material catalyzed by the fullerene as described in claim 1 as the cathode.

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