Electrolyte with inositol as additive and application thereof in zinc battery

Abstract

This invention discloses an electrolyte with inositol as an additive and its application in zinc batteries, relating to the field of novel battery energy storage technology. The electrolyte comprises an aqueous solution of zinc sulfate and inositol, wherein the concentration of the zinc sulfate aqueous solution is 2 mol / L, and the concentration of inositol is 0.05-0.15 mol / L. The zinc battery can be a zinc-zinc symmetrical battery, a zinc-iodine button battery, or a zinc-iodine pouch battery. Advantages include: effectively suppressing hydrogen evolution side reactions and zinc dendrite growth, significantly improving the cycle stability of the zinc anode and the coulombic efficiency of the battery; achieving long cycle life and high energy density while maintaining the intrinsic safety of aqueous batteries; and the electrolyte preparation process is simple and inexpensive, showing broad application prospects in grid-scale energy storage and portable energy devices.

Description

Technical Field

[0001] This invention relates to the field of novel battery energy storage technology, and in particular to an electrolyte with inositol as an additive and its application in zinc batteries. Background Technology

[0002] Among numerous novel energy storage battery systems, aqueous zinc batteries stand out due to their high theoretical capacity (820 mAh / g and 5855 mAh / cm³). 3 With its advantages such as low redox potential (-0.762 V vs. standard hydrogen electrode (SHE)), inherent safety, and environmental friendliness, it has become a strong competitor in grid-scale energy storage applications.

[0003] However, the practical application of zinc batteries still faces severe challenges. The zinc metal anode exhibits poor thermodynamic stability in aqueous electrolytes, easily triggering irreversible hydrogen evolution reaction (HER) and surface passivation corrosion. Furthermore, Zn... 2+ Uneven deposition at the electrode / electrolyte interface can lead to the continuous growth of zinc dendrites.

[0004] Therefore, it is necessary to design an electrolyte with inositol as an additive and its application in zinc batteries. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an electrolyte with inositol as an additive and its application in zinc batteries, thus solving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An electrolyte with inositol as an additive, the electrolyte comprising an aqueous solution of zinc sulfate and inositol, wherein the concentration of the aqueous solution of zinc sulfate is 2 mol / L and the concentration of inositol is 0.05-0.15 mol / L.

[0007] The above-mentioned application of an electrolyte with inositol as an additive in zinc batteries.

[0008] Furthermore, the zinc battery can be a zinc-zinc symmetrical battery, a zinc-iodine button battery, or a zinc-iodine pouch battery.

[0009] Furthermore, zinc-zinc symmetrical batteries are assembled using zinc sheets as negative and positive electrodes, glass fiber as a separator, and an electrolyte with inositol as an additive.

[0010] Furthermore, zinc-iodine button batteries or zinc-iodine pouch batteries are assembled using zinc sheets as the negative electrode, iodine as the positive electrode, glass fiber as the separator, and an electrolyte with inositol as an additive.

[0011] Furthermore, the preparation process of the iodine cathode includes three steps: preparation of the composite carbon matrix, electrodeposition loading, and post-treatment. First, activated carbon, acetylene black and polytetrafluoroethylene (PTFE) binder are weighed in a mass ratio of 8:2:1, and anhydrous ethanol is added dropwise to mix and form a uniform paste. Then, it is rolled and molded onto a titanium mesh current collector to prepare a composite carbon material matrix. The button battery is pressed on one side, and the soft pack battery is pressed on both sides. Subsequently, the above-mentioned matrix was electrodeposited under constant current using a 0.5 mol / L zinc iodide aqueous solution as the electrolyte, so that iodine was uniformly loaded in it. After deposition, it was rinsed with deionized water and dried at room temperature for 4-5 hours to obtain a carbon-based composite cathode with high iodine loading, namely I2 cathode. To adapt to different battery configurations, the activated carbon film thickness in the coin cell is controlled to be 0.4 mm, and it is deposited at a current of 10 mA for 18 minutes. The resulting electrode is cut into a disc with a diameter of 11 mm. In the pouch cell, the activated carbon film thickness is increased to 1.0 mm, the electrodeposition current is increased to 2000 mA and maintained for 39 minutes, and the electrode is cut into square electrode sheets of the corresponding size.

[0012] Furthermore, in zinc-zinc symmetric cells and zinc-iodine button cells, glass fiber is used as the separator, and the electrolyte addition rate in each separator is 0.15-0.25 μL / mm. 2 In zinc-iodine pouch batteries, add 0.05-0.10 mL / cm² to each separator. 2 Electrolyte.

[0013] Furthermore, in zinc-zinc symmetric batteries and zinc-iodine button batteries, the diameter of the battery casing is 20 mm, the diameter of the separator is 19 mm, and 50-70 μL of electrolyte is added to each separator; in zinc-iodine soft-pack batteries, the size of the separator is 10 cm × 10 cm, and 7 mL of electrolyte is added to each separator.

[0014] Compared with existing technologies, the advantages of this invention are as follows: This invention provides an electrolyte with inositol as an additive. By introducing trace amounts of inositol molecules with a multi-hydroxyl structure into the zinc sulfate electrolyte, and utilizing their preferential entry into the zinc ion solvation sheath and characteristic adsorption on the zinc anode surface, the electrolyte interface structure is reconstructed. Compared with existing technologies, this effectively suppresses hydrogen evolution side reactions and zinc dendrite growth, significantly improves the cycle stability of the zinc anode and the coulombic efficiency of the battery, and achieves improved long cycle life and high energy density while maintaining the intrinsic safety of aqueous batteries. The electrolyte preparation process is simple and low-cost, and it has broad application prospects in the fields of grid-scale energy storage and portable energy devices. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the electrolyte preparation process using inositol as an additive according to the present invention. Figure 2 Three-dimensional snapshots of different electrolyte systems and Zn 2+ Solvation structure diagram; Figure 3 The 1H NMR spectrum (left) and infrared spectrum (right) of different electrolyte systems; Figure 4 AFM morphology of zinc electrode after cycling with different electrolytes; Figure 5 XRD patterns of zinc anode after cycling in different electrolytes; Figure 6 Long-cycle diagrams of zinc-zinc symmetric cells assembled using different electrolytes; Figure 7 Long-cycle performance graphs of zinc-iodine button batteries assembled with different electrolytes; Figure 8 This is a schematic diagram of the assembly of a zinc-iodine pouch cell and a diagram of the long-cycle performance of a three-layer pouch cell. Detailed Implementation

[0016] Reference Figures 1-8 The present invention will be further described below with reference to comparative examples and embodiments, and in conjunction with the accompanying drawings. The zinc sheet thickness used in the following comparative examples and embodiments is 200 µm.

[0017] Comparative Example 1: Zinc-Zinc Symmetric Cell Assembled with 2mol / L ZnSO4 Electrolyte Step 1, Preparation of 2mol / L ZnSO4 electrolyte: Dissolve ZnSO4·7H2O in ultrapure water and stir continuously at room temperature for 12 hours to ensure complete dissolution, forming a 2mol / L ZnSO4 solution; Step 2, solvation structure analysis of 2 mol / L ZnSO4 electrolyte: In 2 mol / L ZnSO4 electrolyte, Zn 2+ The first solvation shell consists of five water molecules and one SO42-. 2- Together they form a typical [Zn(H2O)5(SO4)] 2- )] 2+ Coordination structures, such as Figure 2 As shown. This configuration typically results in higher Zn content. 2+ The desolvation barrier is broken, and a large number of free water molecules are generated during the desolvation process, which in turn induces a series of serious side reactions such as hydrogen evolution and zinc anode corrosion. Step 3, Zinc-Zinc Symmetrical Battery Assembly: Assemble CR2025 model (20mm diameter, 2.5mm thickness) symmetric batteries using 2mol / L ZnSO4 electrolyte and conduct cycle stability tests. The battery assembly process is as follows: positive electrode shell, zinc sheet, separator, zinc sheet, stainless steel gasket (16mm diameter, 500µm thickness), stainless steel spring sheet, negative electrode shell. The sealing pressure is approximately 5MPa. Before use, the batteries are allowed to stand at room temperature for 2 hours. The separator is made of glass fiber (manufactured by Whatman, 110mm diameter, 260μm thickness, cut into 19mm diameter discs). 70µL of electrolyte is added to each battery after the separator is placed in the separator. Step 4, Zinc-Zinc Symmetrical Cell Testing: Long-cycle testing of the symmetric cells is conducted in a constant temperature chamber (25℃) to eliminate the influence of ambient temperature, using the Wuhan Landian Battery Testing System, such as... Figure 6 As shown, the test conditions were a current density of 10 mA / cm². 2 Area capacity 1mAh / cm 2 Under these test conditions, the symmetric cell using a 2 mol / L ZnSO4 electrolyte had a lifespan of only 249 hours. Furthermore, at a 5 mA / cm² depth... 2 1mAh / cm 2 Under these conditions, the lifespan is 115 hours.

[0018] Step 5, Surface morphology analysis of zinc-zinc symmetric cells: After cycling, the zinc electrode is removed and its surface morphology is observed using an atomic force microscope, such as... Figure 4 As shown, the zinc anode surface after cycling in ZnSO4 electrolyte exhibits significant undulations and sharp protrusions, with extremely uneven distribution of the deposited layer thickness, displaying typical dendritic growth characteristics, such as... Figure 5 As shown, after cycling in ZnSO4 electrolyte, the intensity ratio of the diffraction peaks of the (002) crystal plane and the (100) crystal plane of the zinc anode (I...) 002 / I 100 The irregular fluctuations observed during different cycles indicate that Zn... 2+ The deposition orientation is random, exhibiting a disordered polycrystalline growth pattern. In addition, XRD patterns show that the ZnSO4 electrolyte has a distinct basic zinc sulfate diffraction peak around 7.68°, and its intensity gradually increases with the number of cycles, indicating that side reactions continue to occur and accumulate.

[0019] Comparative Example 2: Preparation of Zinc-Iodine Button Cells with 2mol / L ZnSO4 Electrolyte and Iodine Cathode Step 1, Preparation of 2 mol / L ZnSO4 electrolyte: Dissolve ZnSO4·7H2O in ultrapure water and stir continuously at room temperature for 12 hours to ensure complete dissolution, forming a 2 mol / L ZnSO4 solution; Step 2, Iodine cathode preparation: The preparation of I2 cathode mainly includes three steps: composite carbon matrix preparation, electrodeposition loading, and post-treatment. First, activated carbon, acetylene black and polytetrafluoroethylene (PTFE) binder are weighed in a mass ratio of 8:2:1, and anhydrous ethanol is added dropwise to mix and form a uniform paste. Then, it is rolled and molded onto a titanium mesh current collector to prepare a composite carbon material matrix. The button battery is pressed on one side, while the soft pack battery is pressed on both sides. Subsequently, the above-mentioned substrate was electrodeposited under constant current using a 0.5 mol / L zinc iodide aqueous solution as the electrolyte, so that iodine was uniformly loaded in it. After deposition, it was rinsed with deionized water and dried at room temperature for 4-5 hours to finally obtain a carbon-based composite cathode (I2 cathode) with high iodine loading. To adapt to different battery configurations, in the coin cell, the thickness of the activated carbon film (excluding titanium mesh) is controlled to 0.4 mm, and it is deposited at a current of 10 mA for 18 minutes. The resulting electrode is cut into a disc with a diameter of 11 mm. In the pouch cell, the activated carbon film thickness is increased to 1.0 mm, the electrodeposition current is increased to 2000 mA and maintained for 39 minutes, and the electrode is finally cut into square electrode sheets of the corresponding size. Step 3, Zinc-Iodine Button Battery Assembly: Assemble CR2025 model (20mm diameter, 2.5mm thickness) zinc-iodine button batteries using 2mol / L ZnSO4 electrolyte and conduct cycle stability tests. The battery assembly process is as follows: positive electrode shell, iodine positive electrode sheet, separator, zinc sheet, stainless steel gasket (16mm diameter, 500µm thickness), stainless steel spring sheet, negative electrode shell. The sealing pressure is approximately 5MPa. Before use, the batteries are left to stand at room temperature for 2 hours. The separator is made of glass fiber (manufactured by Whatman, 110mm diameter, 260μm thickness, cut into 19mm diameter round pieces). 70µL of electrolyte is added to each battery after the separator is placed in the separator. Step 4, Zinc-Iodine Button Battery Testing: The long-cycle test of the battery is conducted in a constant temperature chamber (25℃) using the Wuhan Landian Battery Testing System at a rate of 10C. Figure 7 As shown, the capacity of the battery using ZnSO4 electrolyte rapidly decreases after only 1250 cycles.

[0020] Example 1: Assembly of a zinc-zinc symmetric battery using a 2 mol / L ZnSO4 + 0.1 mol / L inositol (INO) electrolyte. Step 1, Preparation of 2mol / L ZnSO4 + 0.1mol / L inositol electrolyte: Dissolve ZnSO4·7H2O in ultrapure water and stir continuously at room temperature for 12 hours to ensure complete dissolution, forming a 2mol / L ZnSO4 solution. Take a certain volume of ZnSO4 solution and add an appropriate amount of inositol to make its concentration reach 0.1mol / L. Step 2, analysis of the solvation structure and mechanism of 2 mol / L ZnSO4 + 0.1 mol / L inositol electrolyte: (e.g.) Figure 2 As shown, when INO molecules are introduced, they can enter Zn through competitive coordination with water molecules. 2+ In the primary solvation shell, a coordinated water molecule is displaced, thereby forming [Zn(H2O)4(INO)(SO4] 2- )] 2+ A novel solvation structure; To explore the effect of INO additives on Zn 2+ The influence of solvation structure and hydrogen bond network in water was investigated by using 1H NMR spectroscopy with D2O as solvent to study the local electrolyte environment. like Figure 3 As shown, the 2 mol / L ZnSO4 electrolyte 1 The H peak is located at 4.705 ppm. After the introduction of INO molecules, 1 The H peak gradually shifts towards the higher field direction, which is attributed to the competitive hydrogen bonding between the hydroxyl group of the INO molecule and the water molecule, thereby weakening the proton shielding effect. FTIR spectroscopy further corroborates this conclusion, such as... Figure 3 As shown, with increasing INO molecule concentration, the concentration in the 2700-3800 cm⁻¹ range... -1 The OH tensile vibration within the range showed a significant redshift (from 3217.82 cm⁻¹). -1 Up to 3211.77cm -1 This indicates that INO molecules effectively disrupt the hydrogen bond network between water molecules, constructing a low-water-activity stable solvated sheath dominated by INO.

[0021] Step 3, Zinc-Zinc Symmetrical Battery Assembly: CR2025 model (20mm diameter, 2.5mm thickness) symmetric batteries were assembled using 2mol / L ZnSO4 + 0.1mol / L inositol electrolyte and subjected to cycle stability testing. The battery assembly process was as follows: positive electrode shell, zinc sheet, separator, zinc sheet again, stainless steel gasket (16mm diameter, 500µm thickness), stainless steel spring sheet, and negative electrode shell. The sealing pressure was approximately 5MPa. The batteries were allowed to stand at room temperature for 2 hours before use. The separator was made of glass fiber (manufactured by Whatman, 110mm diameter, 260μm thickness, cut into 19mm diameter discs). 70µL of electrolyte was added to each battery after the separator was placed in place. Step 4, Zinc-Zinc Symmetrical Cell Testing: Long-cycle testing of the symmetric cells is conducted in a constant temperature chamber (25℃) using the Wuhan Landian Battery Testing System. Figure 6 As shown, the test conditions were a current density of 10 mA / cm². 2 Area capacity 1mAh / cm 2 Under these test conditions, the lifespan of a symmetrical cell using an inositol-containing electrolyte is approximately 3000 hours. Step 5, Observation of the surface morphology of the zinc symmetric battery: After cycling, the battery is disassembled and the zinc electrode is removed. Its surface morphology is observed using an atomic force microscope, such as... Figure 4 As shown, the zinc anode surface after cycling in ZnSO4 + 0.1 mol / L INO electrolyte is smooth and flat, exhibiting a layered stacked morphology with significantly reduced height fluctuations, and the density and uniformity of the deposited layer are significantly improved. like Figure 5 As shown, I 002 / I 100 The ratio increased continuously with the number of cycles, from 2.495 after 50 cycles to 3.395 after 100 cycles, indicating that INO molecules can effectively guide Zn. 2+ Horizontal epitaxial deposition is preferentially performed along the (002) crystal plane. This preferred orientation helps to form a dense deposition layer that is parallel to the electrode surface, thereby effectively suppressing dendrite initiation and propagation. In addition, the XRD pattern shows that the diffraction signal of the by-product is significantly weakened, indicating that the introduction of INO molecules effectively suppresses interfacial side reactions and enhances the stability of the negative electrode interface.

[0022] Example 2: Assembly of a zinc-iodine button cell with 2 mol / L ZnSO4 + 0.1 mol / L inositol electrolyte Step 1, Preparation of 2 mol / L ZnSO4 + 0.1 mol / L inositol electrolyte: Dissolve ZnSO4·7H2O in ultrapure water and stir continuously at room temperature for 12 hours to ensure complete dissolution and form a 2 mol / L ZnSO4 solution. Take a certain volume of ZnSO4 solution and add an appropriate amount of inositol to make its concentration reach 0.1 mol / L. Step 2, Preparation of Iodine Cathode: The preparation of I2 cathode mainly includes three steps: preparation of composite carbon matrix, electrodeposition loading and post-treatment. First, activated carbon, acetylene black and polytetrafluoroethylene (PTFE) binder are weighed in a mass ratio of 8:2:1, and anhydrous ethanol is added dropwise to mix and form a uniform paste. Then, it is rolled and molded onto a titanium mesh current collector to prepare a composite carbon material matrix. The button battery is pressed on one side, while the soft pack battery is pressed on both sides. Subsequently, the above-mentioned substrate was electrodeposited under constant current using a 0.5 mol / L zinc iodide aqueous solution as the electrolyte, so that iodine was uniformly loaded in it. After deposition, it was rinsed with deionized water and dried at room temperature for 4-5 hours to finally obtain a carbon-based composite cathode (I2 cathode) with high iodine loading. To adapt to different battery configurations, in the coin cell, the thickness of the activated carbon film (excluding titanium mesh) is controlled to 0.4 mm, and it is deposited at a current of 10 mA for 18 minutes. The resulting electrode is cut into a disc with a diameter of 11 mm. In the pouch cell, the activated carbon film thickness is increased to 1.0 mm, the electrodeposition current is increased to 2000 mA and maintained for 39 minutes, and the electrode is finally cut into square electrode sheets of the corresponding size. Step 3, Zinc-Iodine Button Battery Assembly: Assemble CR2025 model (20mm diameter, 2.5mm thickness) zinc-iodine button batteries using 2mol / L ZnSO4 + 0.1mol / L inositol electrolyte and conduct cycle stability tests. The battery assembly process is as follows: positive electrode shell, iodine positive electrode sheet, separator, zinc sheet, stainless steel gasket (16mm diameter, 500µm thickness), stainless steel spring sheet, negative electrode shell. The sealing pressure is approximately 5MPa. Before use, the batteries are left to stand at room temperature for 2 hours. The separator is made of glass fiber (manufactured by Whatman, 110mm diameter, 260μm thickness, cut into 19mm diameter round pieces). 70µL of electrolyte is added to each battery after the separator is placed in the separator. Step 4, Zinc-Iodine Button Battery Testing: The full battery test is conducted in a constant temperature chamber (25℃) using the Wuhan Landian Battery Testing System, such as... Figure 7 As shown, after 20,000 cycles at a 10C rate, it still maintains 91.67% capacity retention.

[0023] Example 3: Assembly of a zinc-iodine pouch cell with 2 mol / L ZnSO4 + 0.1 mol / L inositol electrolyte Step 1, Preparation of 2 mol / L ZnSO4 + 0.1 mol / L inositol electrolyte: Dissolve ZnSO4·7H2O in ultrapure water and stir continuously at room temperature for 12 hours to ensure complete dissolution and form a 2 mol / L ZnSO4 solution. Take a certain volume of ZnSO4 solution and add an appropriate amount of inositol to make its concentration reach 0.1 mol / L. Step 2, Preparation of iodine cathode: Same as Step 2 of Comparative Example 2, using the double-sided pressing and corresponding process parameters corresponding to pouch cells; Step 3, Assembly of Zinc-Iodine Soft-Pack Batteries: A 10cm × 10cm soft-pack zinc-iodine battery was assembled using a 2mol / L ZnSO4 + 0.1mol / L inositol electrolyte for cycle stability testing. The assembly process is as follows: Figure 8 As shown, the battery should be left to stand at room temperature for 2-4 hours before use. The separator is made of glass fiber (manufactured by Whatman, cut into 10cm×10cm pieces). 7mL of electrolyte should be added to the separator before sealing. Step 4, Zinc-Iodine Soft Pack Battery Testing: The full battery test is conducted in a constant temperature chamber (25℃) using the Wuhan Landian Battery Testing System, with a test current of 1500mA. Figure 8 As shown, after 240 cycles at a current of 1500mA, the battery retains approximately 82.29% of its capacity. The total mass of the battery is 119.13g, the maximum discharge energy is 3.00Wh, the corresponding discharge capacity is 2.57Ah, and the mass energy density calculated based on the total mass is approximately 25.18Wh / kg.

[0024] Example 4: Assembling a zinc-zinc symmetric battery with 2 mol / L ZnSO4 + 0.05 mol / L inositol electrolyte. The same steps as in Example 1 were used, except that the inositol concentration added in step 1 was 0.05 mol / L. The assembled zinc-zinc symmetric cell achieved an efficiency of 10 mA / cm². 2 1mAh / cm 2 Under test conditions, the cycle life reached 473 hours.

[0025] Example 5: Assembling a zinc-zinc symmetric battery with 2 mol / L ZnSO4 + 0.15 mol / L inositol electrolyte. The same steps as in Example 1 were used, except that the inositol concentration added in step 1 was 0.15 mol / L. The assembled zinc-zinc symmetric cell achieved an efficiency of 10 mA / cm². 2 1mAh / cm 2 Under test conditions, the cycle life reached 598 hours.

[0026] Table 1 Comparison of long-cycle life test results for symmetric batteries assembled with different electrolytes ; Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This disclosure is intended to cover any variations, uses, or adaptations that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0027] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the content of the present invention's specification shall also be included within the scope of protection of the present invention.

Claims

1. An electrolyte using inositol as an additive, characterized in that, The electrolyte comprises an aqueous solution of zinc sulfate and inositol, wherein the concentration of the aqueous solution of zinc sulfate is 2 mol / L and the concentration of inositol is 0.05-0.15 mol / L.

2. The application of the electrolyte with inositol as an additive as described in claim 1 in a zinc battery.

3. The application of an electrolyte with inositol as an additive according to claim 2 in a zinc battery, characterized in that, Zinc batteries are zinc-zinc symmetrical batteries, zinc-iodine button batteries, or zinc-iodine pouch batteries.

4. The application of the electrolyte with inositol as an additive according to claim 3 in a zinc battery, characterized in that, A zinc-zinc symmetrical battery was assembled using zinc sheets as the negative and positive electrodes, glass fiber as the separator, and inositol as the electrolyte additive.

5. The application of an electrolyte with inositol as an additive according to claim 4 in a zinc battery, characterized in that, Zinc-iodine button batteries or zinc-iodine pouch batteries are assembled using zinc sheets as the negative electrode, iodine as the positive electrode, glass fiber as the separator, and inositol as an additive as the electrolyte.

6. The application of an electrolyte with inositol as an additive according to claim 5 in a zinc battery, characterized in that, The preparation process of the iodine cathode includes three steps: preparation of the composite carbon matrix, electrodeposition loading, and post-treatment. First, activated carbon, acetylene black and polytetrafluoroethylene (PTFE) binder are weighed in a mass ratio of 8:2:1, and anhydrous ethanol is added dropwise to mix and form a uniform paste. Then, it is rolled and molded onto a titanium mesh current collector to prepare a composite carbon material matrix. The button battery is pressed on one side, and the soft pack battery is pressed on both sides. Subsequently, the above-mentioned matrix was electrodeposited under constant current using a 0.5 mol / L zinc iodide aqueous solution as the electrolyte, so that iodine was uniformly loaded in it. After deposition, it was rinsed with deionized water and dried at room temperature for 4-5 hours to obtain a carbon-based composite cathode with high iodine loading, namely I2 cathode. To adapt to different battery configurations, the activated carbon film thickness in the coin cell is controlled to be 0.4 mm, and it is deposited at a current of 10 mA for 18 minutes. The resulting electrode is cut into a disc with a diameter of 11 mm. In the pouch cell, the activated carbon film thickness is increased to 1.0 mm, the electrodeposition current is increased to 2000 mA and maintained for 39 minutes, and the electrode is cut into square electrode sheets of the corresponding size.

7. The application of an electrolyte with inositol as an additive according to claim 5 in a zinc battery, characterized in that, In zinc-zinc symmetric battery and zinc-iodine button cell, glass fiber is diaphragm, and the amount of electrolyte added in each diaphragm is 0.15-0.25 μL / mm 2 ; In zinc-iodine pouch batteries, 0.05-0.10 mL / cm² is added to each separator. 2 Electrolyte.

8. The application of an electrolyte with inositol as an additive according to claim 7 in a zinc battery, characterized in that, In zinc-zinc symmetric batteries and zinc-iodine button batteries, the diameter of the battery casing is 20 mm, the diameter of the separator is 19 mm, and 50-70 μL of electrolyte is added to each separator; in zinc-iodine soft-pack batteries, the size of the separator is 10 cm × 10 cm, and 7 mL of electrolyte is added to each separator.

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