Aqueous zinc-iodine battery electrolyte additive, electrolyte preparation method and aqueous zinc-iodine battery preparation method

Abstract

The invention discloses an aqueous zinc-iodine battery electrolyte additive, an electrolyte preparation method and an aqueous zinc-iodine battery preparation method, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride is used as a multifunctional electrolyte additive, and reversible four-electron conversion reaction is realized by synergistically regulating and controlling a zinc ion solvation structure and stable iodine positive ions, so that the zinc-iodine battery electrolyte additive is obtained. The energy density and the cycling stability of the water-based zinc-iodine battery are greatly improved, and dendritic crystal generation and side reaction can be inhibited. The electrolyte is composed of ZnSO and CHPTAC, and the pH value of the electrolyte is 5-6. The positive electrode of the iodine battery adopts a current collector-free structure, and a self-supporting electrode is prepared by compounding iodine and activated carbon and combining with carbon nanotube slurry. The zinc-iodine total battery constructed by the electrolyte and the iodine positive electrode has remarkable performance advantages.

Description

An additive for an aqueous zinc-iodine battery electrolyte, a method for preparing the electrolyte, and a method for preparing an aqueous zinc-iodine battery. Technical Field

[0001] This invention belongs to the field of battery technology, specifically relating to electrolyte additives for aqueous zinc-iodine batteries, electrolyte preparation methods, and aqueous zinc-iodine batteries. Background Technology

[0002] Developing safe, efficient, and sustainable energy storage technologies has become a crucial issue in the energy sector. Aqueous batteries, due to their advantages such as high electrolyte safety, abundant raw materials, environmental friendliness, and low cost, are gradually becoming a research hotspot for large-scale energy storage systems. Existing zinc-iodine battery systems primarily rely on… The single-electron reaction process in zinc-iodine batteries results in a low output voltage plateau, typically below 1.2 V, and a small theoretical capacity of only 211 mAh / g. Furthermore, the shuttle effect leads to capacity decay, reduced coulombic efficiency, and shortened cycle life, causing increased electrode polarization and reaction inhomogeneity, further affecting battery stability and energy output. In existing technologies, a high-concentration ZnCl2 electrolyte formulation is used to stabilize the four-electron reaction in zinc-iodine batteries, resulting in a novel zinc-iodine battery with a capacity improvement of 594 mAh / g vs. 211 mAh / g, and a high energy density of up to 750 Wh / kg. However, the high concentration of chloride electrolyte leads to severe corrosion of the current collector and zinc anode, increases electrolyte viscosity, and thus reduces ion migration rate, limiting practical applications. Therefore, effectively controlling the valence state transformation process of iodine, stabilizing its reaction pathway, and suppressing the shuttle of polyiodide ions are key technical issues for improving the energy density and cycle stability of aqueous zinc-iodine batteries. Summary of the Invention

[0003] The technical problem solved by this invention is: the need for a multifunctional electrolyte additive that can stabilize iodide ions, accelerate reaction kinetics, effectively regulate the solvation structure of zinc ions, and inhibit zinc dendrites.

[0004] To achieve the above objectives, the technical solution proposed by this invention is as follows:

[0005] An additive for aqueous zinc-iodine battery electrolyte, wherein the additive is an aqueous solution of 3-chloro-2-hydroxypropyltrimethylammonium chloride, used to prepare aqueous zinc-iodine battery electrolyte.

[0006] A method for preparing an aqueous zinc-iodine battery electrolyte, comprising:

[0007] Weigh a predetermined amount of 3-chloro-2-hydroxypropyltrimethylammonium chloride aqueous solution and place it in a volumetric flask. Add an equal amount of ZnSO4·7H2O solid to the 3-chloro-2-hydroxypropyltrimethylammonium chloride aqueous solution. Make up to the predetermined volume with deionized water, and then adjust the pH value to 5-6 with ammonia water to prepare an aqueous zinc-iodine battery electrolyte containing CHPTAC additive.

[0008] In the aforementioned method for preparing an aqueous zinc-iodine battery electrolyte, the molar amount is 0.02 Mol and the set volume is 20 ml.

[0009] A method for preparing an aqueous zinc-iodine battery includes:

[0010] The preparation of an iodine cathode includes:

[0011] Activated carbon and elemental iodine are mixed in a mass ratio of 1:1, 2:1, or 3:2, ground evenly in a mortar, and then heated in an oven at 100-120℃ for 2-3 hours to obtain the iodine-activated carbon complex I2@AC.

[0012] After measuring the iodine content in the I2@AC composite again using a thermogravimetric analyzer (TG), the I2@AC composite was mixed with aqueous single-arm carbon nanotube slurry according to the set mass ratio. After stirring with a stirring rotor for 10-12 hours, the mixture was filtered to obtain circular sheets. The circular sheets were then dried in an oven at 45-60℃ for 10-12 hours. Finally, the circular sheets were cut into the required size using a tablet press to obtain the iodine positive electrode for the zinc-iodine battery.

[0013] Also includes:

[0014] The battery is stacked in the following order: positive electrode battery casing, iodine positive electrode, separator, negative electrode, battery casing gasket, battery casing spring, and negative electrode battery casing to form a multi-layer sandwich structure.

[0015] The electrolyte is dropped onto the separator to fully wet the positive and negative electrodes; the electrolyte is the iodine battery electrolyte prepared above, and the amount of electrolyte added is 70-120 μL.

[0016] After the multi-layer sandwich structure is compressed, it is sealed using a battery packaging machine to obtain an aqueous zinc-iodine battery.

[0017] The aforementioned method for preparing an aqueous zinc-iodine battery sets the mass ratio to 95:5.

[0018] In the aforementioned method for preparing an aqueous zinc-iodine battery, the iodine cathode loading is adjusted according to the mass of the added I2@AC composite, and is 2 mg / cm³. 2 Up to 5 mg / cm 2 .

[0019] In the aforementioned method for preparing an aqueous zinc-iodine battery, the battery casing has a diameter of 20 mm and a depth of 25 mm to 32 mm; the iodine positive electrode is a 10 mm or 12 mm diameter disc.

[0020] In the aforementioned method for preparing an aqueous zinc-iodine battery, the separator is a glass fiber separator, filter paper, or cation exchange membrane, and is a 19mm diameter disc.

[0021] In the aforementioned method for preparing an aqueous zinc-iodine battery, the negative electrode is a zinc foil, zinc sheet, or electrodeposited zinc; the negative electrode zinc is a circular sheet with a diameter of 14 mm or 16 mm.

[0022] The beneficial effects achieved by this invention are as follows: This invention provides a multifunctional electrolyte additive, the composition of which is 3-chloro-2-hydroxypropyltrimethylammonium chloride (CHPTAC). 3-chloro-2-hydroxypropyltrimethylammonium chloride (CHPTAC) is used as an electrolyte additive to simultaneously achieve Zn 2+ The solvation structure regulation, the reversible four-electron reaction of iodine, and the suppression of polyiodide shuttle improve the reversibility and reaction kinetics of the four-electron reaction of iodine cathode, and enable more uniform deposition of zinc anode, thus synergistically optimizing zinc anode and iodine cathode.

[0023] This invention provides a self-supporting, current-free iodine cathode, eliminating the need for traditional metal foil current collectors, reducing the battery's inert weight and cost. Furthermore, the abundant carbon nanotubes in the cathode contribute to improved reaction kinetics, reduced polarization, and enhanced rate performance. Under a chloride ion concentration of only 1 mol / L, the zinc-iodine full cell exhibits excellent cycling performance, and the zinc-copper half cell demonstrates outstanding zinc deposition / stripping performance exceeding 700 cycles, with an average coulombic efficiency of 99.7%. The zinc-zinc half cell exhibits excellent performance at 1 mA / cm². 2 (Unit of current) 0.5 mAh / Under the condition of (capacity unit), it can cycle more than 900 times.

[0024] The present invention provides a high-energy-density aqueous zinc-iodine battery that is simple, economical and effective, promoting its application and development in the field of large-scale energy storage. Attached Figure Description

[0025] Figure 1 shows the structural formula of the CHPTAC additive in Example 1 of the present invention;

[0026] Figure 2 shows the performance of Zn / / Cu half-cells with different electrolytes in Example 3 of the present invention;

[0027] Figure 3 shows the performance of Zn / / Zn half-cells with different electrolytes in Example 3 of the present invention.

[0028] Figure 4 shows the LSV curves of different electrolytes in Example 3 of the present invention;

[0029] Figure 5 shows the CV curves of the full cell under different electrolytes in Example 3 of the present invention.

[0030] Figure 6 shows the rate performance of the full battery under different electrolytes in Example 3 of the present invention.

[0031] Figure 7 is a schematic diagram of the long-cycle performance of the zinc-iodine battery in Example 3 of the present invention in 2M zinc sulfate + 1M CHPTAC electrolyte.

[0032] Figure 8 is a graph of dQ / dV and voltage curves after 1000 cycles in Embodiment 3 of the present invention.

[0033] Figure 9 is a SEM image of the zinc negative electrode after cycling in Example 3 of the present invention;

[0034] Figure 10 is a comparison of XRD patterns after cycling in Embodiment 3 of the present invention;

[0035] Figure 11 is the in-situ Raman spectrum of the four-electron reaction in Example 3 of the present invention;

[0036] Figure 12 is a GITT curve of a full cell with different electrolytes in Example 3 of the present invention. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] Unless otherwise specified, the experimental methods used in the embodiments of this application are all conventional methods.

[0039] In the following examples and comparative examples, unless otherwise specified, all raw materials can be prepared by commercial purchase or conventional methods.

[0040] Example 1

[0041] This embodiment provides an additive for an aqueous zinc-iodine battery electrolyte. The additive is a quaternary ammonium chloride, specifically 3-chloro-2-hydroxypropyltrimethylammonium chloride (CHPTAC), used to prepare an aqueous zinc-iodine battery electrolyte.

[0042] CHPTAC can achieve Zn 2+The CHPTAC exhibits functions such as solvation structure regulation, reversible four-electron reaction of iodine, and inhibition of polyiodide shuttle, synergistically optimizing the zinc anode and iodine cathode. The chemical structure of CHPTAC is shown in Figure 1. CHPTAC is an aqueous solution with a mass fraction of 65%. The CHPTAC cation contains hydroxyl and chlorine functional groups, effectively disrupting the regular hydrogen bond network between water molecules, constructing a weakly solvated structure to improve the interfacial stability of the zinc anode. The iodophilic quaternary ammonium salt cation not only effectively stabilizes the iodide cation but also adsorbs onto the anode surface, promoting uniform deposition of zinc ions along the 002 crystal plane.

[0043] Example 2

[0044] This embodiment provides a method for preparing an aqueous zinc-iodine battery electrolyte, including:

[0045] Weigh 0.02 Mol of an aqueous solution of 3-chloro-2-hydroxypropyltrimethylammonium chloride and place it in a volumetric flask. Add 0.02 Mol of solid ZnSO4·7H2O to the aqueous solution of 3-chloro-2-hydroxypropyltrimethylammonium chloride. Make up the volume to 20 ml with deionized water. Then adjust the pH value to 5-6 with ammonia water to prepare an aqueous zinc-iodine battery electrolyte containing CHPTAC additive.

[0046] A 2 mol / L ZnSO4 aqueous electrolyte was prepared using ZnSO4·7H2O and deionized water in a molar ratio. This electrolyte served as a control group for the aqueous zinc-iodine battery, and was used to compare and analyze the effect of CHPTAC additives on the overall zinc-iodine battery.

[0047] Example 3

[0048] This embodiment provides a method for preparing an aqueous zinc-iodine battery, including:

[0049] The preparation of an iodine cathode includes:

[0050] Mix 500 mg of activated carbon with 500 mg of elemental iodine at a mass ratio of 1:1, grind evenly in a mortar, and then heat in an oven at 100-120℃ for 2-3 hours to obtain the iodine-activated carbon complex I2@AC.

[0051] Since iodine is lost during heating, the iodine content in the I2@AC composite was measured again using a thermogravimetric analyzer (TG). The I2@AC composite was then mixed with aqueous single-arm carbon nanotube slurry at a set mass ratio of 95:5. After stirring with a stirring rotor for 10-12 hours, the mixture was filtered to obtain circular sheets. The circular sheets were then dried in an oven at 45-60℃ for 10-12 hours. Finally, the circular sheets were cut into the required dimensions using a tablet press to obtain the iodine positive electrode for the zinc-iodine battery.

[0052] The iodine cathode loading can be adjusted according to the mass of I2@AC added; in this embodiment, it is 2 mg / cm³. 2 Up to 5 mg / cm 2 .

[0053] The aqueous zinc-iodine battery, in addition to the positive electrode, also includes a negative electrode, a separator, and a battery casing; the separator is located between the positive and negative electrodes. The steps for preparing the aqueous zinc-iodine battery include:

[0054] The battery is stacked in the following order: positive electrode battery case, positive electrode, separator, negative electrode, battery case gasket, battery case spring, and negative electrode battery case to form a multi-layer sandwich structure.

[0055] The electrolyte is dropped onto the separator to fully wet the positive and negative electrodes; the electrolyte is the iodine battery electrolyte prepared in Example 2, and the amount of electrolyte added is 70-120 μL.

[0056] After the multi-layer sandwich structure is compressed, it is sealed using a battery packaging machine to obtain an aqueous zinc-iodine battery.

[0057] The battery casing is a corrosion-resistant battery casing of model 2025 / 2032, with a diameter of 20mm and a depth of 25mm~32mm. The positive electrode is the iodine positive electrode prepared above, cut into a circular piece with a diameter of 10mm or 12mm to correspond to the battery casing size. The separator is a glass fiber separator, filter paper, or cation exchange membrane, cut into a circular piece with a diameter of 19mm to correspond to the battery casing size. The negative electrode is zinc foil, zinc sheet, or electrodeposited zinc; to correspond to the battery casing size, the zinc negative electrode is cut into a circular piece with a diameter of 14mm or 16mm.

[0058] Figure 2 shows the performance of Zn / / Cu half-cells with 2 mol ZnSO4 (abbreviated as BE) and 2 mol ZnSO4 + 1 mol CHPTAC (abbreviated as BE + CHPTAC). As can be seen from Figure 2, the Zn / / Cu half-cell has the shortest lifespan without electrolyte additives, failing in less than 50 cycles. The half-cell with additives shows a significantly improved cycle life, reaching 2 mA / cm². 2 2 mAh / cm 2 It can still operate normally after 500 cycles at a current density, and the average coulombic efficiency reaches 99.7%, indicating that CHPTAC promotes reversible zinc deposition / stripping and inhibits the occurrence of side reactions.

[0059] Figure 3 shows the performance of Zn / / Zn half-cells in BE and BE+CHPTAC. As can be seen from Figure 3, the Zn / / Zn half-cell with no electrolyte additives has the shortest cycle life, short-circuiting in less than 50 cycles. The half-cell with additives shows a significantly improved cycle life, reaching 2 mA / cm².2 2 mAh / cm 2 It can still operate normally after 900 cycles at a current density. The surface CHPTAC promotes uniform zinc deposition and inhibits dendrite formation and side reactions.

[0060] Figure 4 shows the LSV curves of BE and BE+CHPTAC. A three-electrode assembly was used, with a titanium foil as the working electrode, Ag / AgCl as the reference electrode, and a platinum sheet as the counter electrode. Figure 4 shows that the addition of CHPTAC effectively inhibits the hydrogen evolution reaction (HER).

[0061] Figure 5 shows the CV curves of the zinc-iodine full cell under different electrolytes. At a chloride ion concentration of 1 mol / L, comparing three different quaternary ammonium chlorides, it was found that under the same conditions, the electrolyte with CHPTAC added had the strongest redox peak of I2 / I+, indicating that CHPTAC has a significant effect on stabilizing iodide ions.

[0062] Figure 6 shows the rate performance of the zinc-iodine full cell under different electrolytes and the GCD at 2C. The GCD shows that the BE electrolyte lacks the I2 / I+ redox reaction plateau, and its specific capacity is significantly lower than that of the electrolyte with added CHPTAC. The iodophilic quaternary ammonium salt cation and chloride ion in the CHPTAC additive work synergistically to stabilize the iodide cation, making the four-electron conversion reaction of iodine reversible. At 2C current density, the specific capacity is close to 450 mAh / g, consistent with the theoretical specific capacity of the four-electron reaction of iodine, and far exceeds that of the two-electron reaction; the theoretical specific capacity is 211 mAh / g.

[0063] Performance Test 1

[0064] Figure 7 shows the long-cycle performance of the electrolyte with additives at 2C, where the iodine cathode loading is 2 mg / cm³. 2 As shown in the figure, at a 2C current density, the full cell exhibits a specific capacity of 450 mAh / g, and after 1700 cycles, the specific capacity still reaches 350 mAh / g, far exceeding the theoretical specific capacity of the two-electron reaction, proving that the four-electron reaction of iodine is highly reversible. This verifies that the present invention is a zinc-iodine battery with high specific energy and a high voltage platform.

[0065] Performance Test 2

[0066] Figure 8 shows the dQ / dV vs. voltage curves after 1000 cycles. As can be seen from Figure 8, after 1000 cycles, the I² / I² = approximately 1.7V. + The redox reaction platform still exists, proving that the four-electron reaction is highly reversible.

[0067] Performance Test 3

[0068] Figures 9 and 10 show the results under BE electrolyte and BE+CHPTAC electrolyte conditions, respectively, at 2 mA / cm². 2 2 mAh / cm 2 SEM images of the zinc anode after 100 cycles at a current density are shown in Figure 9. The electrolyte used in Figure 9 is 2 mol zinc sulfate, and the electrolyte used in Figure 10 is 2 mol zinc sulfate + 1 mol CHPTAC. In Figure 9, (a) and (c) show the morphology of the zinc anode in the BE electrolyte, and (b) and (d) show the morphology of the zinc anode in the electrolyte with the additive. As can be seen from the figures, zinc in the BE electrolyte deposits along the 101 crystal plane, resulting in severe zinc dendrite formation. In contrast, the zinc deposition in the electrolyte with CHPTAC is more uniform, mainly along the 002 crystal plane. This indicates that the CHPTAC additive can promote uniform zinc deposition, inhibit zinc dendrite formation, and effectively protect the anode.

[0069] Performance Test 4

[0070] Figure 11 shows the XRD comparison after cycling the two electrolytes. As can be seen from Figure 11, in the BE electrolyte, zinc is mainly deposited along the 101 crystal plane, accompanied by the formation of the byproduct basic zinc sulfate (ZnSO4(OH)6·H2O). In the BE+CHPTAC electrolyte, zinc is mainly deposited along the 002 crystal plane, and the CHPTAC additive effectively regulates the solvation structure of zinc ions and inhibits the formation of byproducts.

[0071] Performance Test 5

[0072] Figure 12 shows the in-situ Raman spectrum of a zinc-iodine full cell in BE+CHPTAC electrolyte. The materials prepared were as follows: a polished zinc sheet was cut into 16mm round pieces, and a glass fiber diaphragm (GF / D) was cut into 19mm pieces. The prepared I2@AC, super P, and CMC were mixed at a mass ratio of 8:1:1, ground into a slurry, and uniformly coated onto a titanium mesh. The material was then mounted on an in-situ Raman mold for testing. The test results are shown in the figure. Under voltage a2, the spectral density at 110 cm⁻¹... -1 I3 appears at Raman shift. - The peak is at 160 cm. -1 I5 appears at the Raman shift. - The peak corresponds to the two-electron conversion reaction of iodine (I... - / I2), under voltage a4, I5 - The peak shifts to a higher wavelength, indicating that iodine is transitioning to a higher valence state, reaching its peak at b0, which corresponds perfectly to the CV curve. During discharge, I... + It then shifts to I2, corresponding to a peak shift to a lower band.

[0073] This invention utilizes a multifunctional electrolyte additive, 3-chloro-2-hydroxypropyltrimethylammonium chloride (CHPTAC), to improve the reversibility and reaction kinetics of the four-electron reaction at the iodine cathode and to promote more uniform deposition of the zinc anode. Specifically, CHPTAC, as a quaternary ammonium salt cationic chloride, contains hydroxyl and chlorine functional groups in its cation, effectively disrupting the regular hydrogen bond network between water molecules and constructing a weakly solvated structure to improve the interfacial stability of the zinc anode. The iodophilic quaternary ammonium salt cation not only effectively stabilizes the iodine ion but also adsorbs onto the anode surface to promote uniform deposition of zinc ions along the 002 crystal plane. Simultaneously, this invention designs a self-supporting current collector-free cathode, eliminating the need for traditional metal foil current collectors and reducing the battery's inert weight and cost. Furthermore, the abundant carbon nanotubes in the electrode contribute to improved reaction kinetics, reduced polarization, and enhanced rate performance. Finally, under a chloride ion concentration of only 1 mol / L, the zinc-iodine full cell exhibited excellent cycling performance, and the zinc-copper half cell demonstrated outstanding zinc deposition / stripping performance exceeding 500 cycles, with an average coulombic efficiency of 99.7%. The zinc-zinc half cell also showed excellent performance at 1 mA / cm². 2 0.5 mAh / cm 2 The cells cycled for over 900 cycles under the specified current conditions. These results demonstrate the practicality and effectiveness of the CHPTAC additive in improving the four-electron reaction of zinc-iodine batteries. The zinc-iodine full cell assembled from BE+CHPTAC electrolyte and a self-supporting electrodeless fluid negative electrode exhibits high specific energy and a high voltage platform, providing some inspiration for the subsequent development of high-specific-energy zinc-iodine batteries for large-scale energy storage.

[0074] In addition, the main raw materials used in this embodiment are widely available, inexpensive and environmentally friendly. The entire system preparation process is carried out at room temperature and pressure, and is simple to operate, safe and pollution-free.

[0075] Example 4

[0076] This embodiment provides a method for preparing an aqueous zinc-iodine battery, including:

[0077] The preparation of an iodine cathode includes:

[0078] Activated carbon and elemental iodine are mixed in a mass ratio of 2:1 or 3:2, ground evenly in a mortar, and then placed in an oven at 100-120℃ for 2-3 hours to obtain the iodine-activated carbon complex I2@AC.

[0079] Since iodine is lost during heating, the iodine content in the I2@AC composite was measured again using a thermogravimetric analyzer (TG). The I2@AC composite was then mixed with aqueous single-arm carbon nanotube slurry at a set mass ratio of 95:5. After stirring with a stirring rotor for 10-12 hours, the mixture was filtered to obtain circular sheets. The circular sheets were then dried in an oven at 45-60℃ for 10-12 hours. Finally, the circular sheets were cut into the required dimensions using a tablet press to obtain the iodine positive electrode for the zinc-iodine battery.

[0080] It should be noted that the above-described embodiments should be understood as illustrative, not as limiting the scope of protection of this invention. The scope of protection of this invention is defined by the claims. For those skilled in the art, some non-essential improvements and adjustments made to this invention without departing from the essence and scope of this invention still fall within the scope of protection of this invention.

Claims

1. An additive for an aqueous zinc-iodine battery electrolyte, characterized in that: The additive for the aqueous zinc-iodine battery electrolyte is an aqueous solution of 3-chloro-2-hydroxypropyltrimethylammonium chloride, used to prepare the aqueous zinc-iodine battery electrolyte.

2. A method for preparing an aqueous zinc-iodine battery electrolyte, characterized in that: include: Weigh a predetermined amount of 3-chloro-2-hydroxypropyltrimethylammonium chloride aqueous solution and place it in a volumetric flask. Add an equal amount of ZnSO4·7H2O solid to the 3-chloro-2-hydroxypropyltrimethylammonium chloride aqueous solution. Make up to the predetermined volume with deionized water, and then adjust the pH value to 5-6 with ammonia water to prepare an aqueous zinc-iodine battery electrolyte containing CHPTAC additive.

3. The method for preparing an aqueous zinc-iodine battery electrolyte according to claim 2, wherein the set molar amount is 0.02 mol and the set volume is 20 mL.

4. A method for preparing an aqueous zinc-iodine battery, characterized in that: include: The preparation of an iodine positive electrode includes: mixing activated carbon and elemental iodine in a mass ratio of 1:1, 2:1, or 3:2, grinding them evenly in a mortar and pestle, and then placing them at 100-120℃. The process involves heating in an oven for 2-3 hours to obtain an iodine-activated carbon composite I2@AC. After measuring the iodine content in the composite I2@AC again using a thermogravimetric analyzer, the composite I2@AC is mixed with an aqueous single-arm carbon nanotube slurry at a predetermined mass ratio. The mixture is stirred with a stirring rotor for 10-12 hours and then filtered to obtain circular sheets. These sheets are then dried in an oven at 45-60℃ for 10-12 hours and cut into the required dimensions using a pressing machine to obtain the iodine positive electrode for the zinc-iodine battery. The process also includes stacking a multi-layer sandwich structure in the following order: positive electrode battery casing, iodine positive electrode, separator, negative electrode, battery casing gasket, battery casing spring, and negative electrode battery casing. Electrolyte is dripped onto the separator to fully wet the positive and negative electrodes. The electrolyte is the iodine battery electrolyte prepared above, with an electrolyte addition amount of 70-120 μL. After pressing the multi-layer sandwich structure, it is sealed using a battery packaging machine to obtain an aqueous zinc-iodine battery.

5. The method for preparing an aqueous zinc-iodine battery according to claim 4, characterized in that: Set the mass ratio to 95:

5.

6. The method for preparing an aqueous zinc-iodine battery according to claim 4, characterized in that: The iodine cathode loading was adjusted according to the mass of the added I2@AC complex, and was set to 2 mg / cm³. 2 Up to 5 mg / cm 2 .

7. The method for preparing an aqueous zinc-iodine battery according to claim 4, characterized in that: The battery casing has a diameter of 20mm and a depth of 25mm~32mm; the iodine positive electrode is a 10mm or 12mm diameter disc.

8. The method for preparing an aqueous zinc-iodine battery according to claim 4, characterized in that: The diaphragm is a glass fiber diaphragm, filter paper, or cation exchange membrane, and is a 19mm diameter disc.

9. The method for preparing an aqueous zinc-iodine battery according to claim 4, characterized in that: The negative electrode is zinc foil, zinc sheet, or electrodeposited zinc; the negative zinc electrode is a disc with a diameter of 14 mm or 16 mm.

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