A polyethylene glycol diacrylate water-based zinc ion battery electrolyte and preparation and application thereof

Abstract

The application discloses a polyethylene glycol diacrylate water-based zinc ion battery electrolyte and a preparation and application thereof, and relates to the technical field of water-based zinc ion batteries.The electrolyte is prepared by polyethylene glycol diacrylate (PEGDA) and water-soluble zinc salt (for example, zinc sulfate) with certain concentrations respectively.The PEGDA / ZnSO4 electrolyte utilizes the cross-linked water-soluble polymer PEGDA to form a three-dimensional network structure to limit the diffusion path of Zn 2+ , and let the ordered ion channel guide Zn 2+ from vertical deposition to horizontal deposition; the cross-linked structure can also enhance the interface mechanical strength, prevent the SEI from being broken in the cycle, improve the interface stability, inhibit the dendrite, and thus improve the cycle life of the battery.

Description

Technical Field

[0001] This invention relates to the field of aqueous zinc-ion battery technology, and particularly to polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte. Background Technology

[0002] Currently, global renewable energy (wind and solar) technologies are developing rapidly. There is an urgent need for large-scale energy storage technologies that are safe, low-cost, long-lasting, and environmentally friendly. Lithium-ion batteries, with their high energy density, long cycle life, more stable voltage, lower self-discharge rate, and support for fast charging, are currently the world's mainstream energy storage technology.

[0003] However, among lithium-ion batteries, ternary lithium batteries are resistant to low temperatures but have poor high-temperature stability and may explode at 250°C; lithium iron phosphate batteries are resistant to high temperatures (500°C) but have weak low-temperature performance; and they are also more expensive. Inferior lithium-ion batteries are prone to over-discharge or damage due to uneven self-discharge.

[0004] Zinc-ion batteries (AZIBs) emerged in this context. They utilize abundant, inexpensive, non-toxic, and easily recyclable zinc as the negative electrode and a non-flammable aqueous solution as the electrolyte. This fundamentally solves the safety hazards of traditional lithium batteries and significantly reduces raw material costs and the difficulty of battery manufacturing and recycling. The zinc negative electrode also boasts advantages such as high theoretical capacity (820 mAh / g) and low redox potential (-0.76 V vs. SHE).

[0005] However, aqueous zinc-ion batteries also have their own defects and drawbacks. Dendrite growth in the zinc anode during charging and discharging can easily puncture the separator, leading to short circuits, ultimately affecting battery cycle life, and causing a series of chain reactions such as hydrogen evolution corrosion, severely impacting battery performance and safety. These problems have hindered the widespread application of aqueous zinc-ion batteries. Summary of the Invention

[0006] To address the shortcomings of the existing technologies, this invention provides a polyethylene glycol diacrylate (PEGDA) aqueous zinc-ion battery electrolyte, its preparation, and its application. This invention improves the electrolyte environment of the zinc anode by optimizing the electrolyte solution in aqueous zinc-ion batteries. Specifically, the electrolyte using polyethylene glycol diacrylate (hereinafter referred to as PEGDA) as an additive is simple, safe, and environmentally friendly, and the resulting electrolyte enables aqueous zinc-ion batteries to exhibit superior electrochemical performance. This invention is specifically achieved through the following techniques.

[0007] A polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte, the raw materials of which include polyethylene glycol diacrylate, water-soluble zinc salt and water; the mass fraction of the polyethylene glycol diacrylate is 0.01-0.1%, and the concentration of the water-soluble zinc salt is 1-5 mol / L.

[0008] Furthermore, the mass fraction of the polyethylene glycol diacrylate is 0.01%.

[0009] Furthermore, the concentration of the water-soluble zinc salt is 2 mol / L.

[0010] Polyethylene glycol diacrylate (PEGDA) is a cross-linked water-soluble polymer that forms a three-dimensional network structure that can confine Zn. 2+ Diffusion pathways allow ordered ion channels to guide Zn 2+ The shift from vertical to horizontal deposition suppresses dendrite formation, thereby improving battery cycle life. The cross-linked structure formed by PEGDA in the electrolyte also enhances interfacial mechanical strength, prevents SEI rupture during cycling, improves interfacial stability, suppresses dendrite formation, and further improves battery cycle life, thus optimizing the electrochemical performance of zinc-metal aqueous batteries.

[0011] The present invention also provides a method for preparing the above-mentioned polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte, which involves completely dissolving the water-soluble zinc salt in water, adding the polyethylene glycol diacrylate dropwise, and mixing evenly to prepare the electrolyte.

[0012] Further, the water-soluble zinc salt is added to water and stirred for 5-10 minutes until completely dissolved.

[0013] Further, after adding the polyethylene glycol diacrylate, mix for 5-10 minutes until the mixture is homogeneous.

[0014] Optionally, the preparation method of polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte is as follows: firstly, dissolve the heptahydrate water-soluble zinc salt in distilled water, then add polyethylene glycol diacrylate to the water-soluble zinc salt solution, and finally mix the solution thoroughly to obtain the finished polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte.

[0015] Specifically, as one method for preparing a polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte, using zinc sulfate as an example, the steps include:

[0016] (1) Weigh 11.50g of ZnSO4·7H2O into a small beaker using an electronic balance, dilute with water to 20 mL, and stir continuously with a glass rod until the solid is completely dissolved. Pour the solution into a glass bottle.

[0017] (2) According to the preset mass fraction of polyethylene glycol diacrylate in the electrolyte, add polyethylene glycol diacrylate stock solution to the glass bottle, cover the bottle cap, shake the whole system evenly, and make the finished electrolyte product.

[0018] The present invention also provides an application of the above-mentioned polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte, specifically as an electrolyte for assembling and preparing aqueous zinc-ion batteries.

[0019] The present invention also provides an aqueous zinc-ion battery, the structure of which includes a positive electrode, a negative electrode, a separator, a gasket, a spring, a positive electrode shell, a negative electrode shell, and the above-mentioned polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] 1. The PEGDA of this invention is a cross-linked water-soluble polymer that forms a three-dimensional network structure to confine Zn. 2+ Diffusion pathways allow ordered ion channels to guide Zn 2+ The shift from vertical to horizontal deposition significantly suppressed dendrite growth, thereby improving the cycle life of aqueous zinc-ion batteries.

[0022] 2. This invention is simple, green and environmentally friendly, and the electrolyte additives used are conventional pharmaceuticals. Attached Figure Description

[0023] Figure 1 Fourier transform infrared spectra of PEGDA / ZnSO4 electrolyte (Example 1), zinc sulfate electrolyte (Comparative Example 1), and PEGDA solution (Comparative Example 2).

[0024] Figure 2 Raman spectra of PEGDA / ZnSO4 electrolyte (Example 1), zinc sulfate electrolyte (Comparative Example 1), and PEGDA solution (Comparative Example 2).

[0025] Figure 3 For Zn / / Zn symmetric cells at 2 mA / cm 2 Test curves at current density. Figure (a) shows the long-cycle test results of Zn / / Zn symmetric batteries assembled with the PEGDA / ZnSO4 electrolytes of Examples 1-3 (PEGDA mass fractions of 0.01%, 0.03%, and 0.05%, respectively) and the ZnSO4 electrolyte of Comparative Example 1. Figures (b) and (e) show the charge-discharge curves of the Zn / / Zn symmetric batteries assembled with the PEGDA / ZnSO4 electrolyte of Example 1 and the ZnSO4 electrolyte of Comparative Example 1, respectively, at different numbers of cycles. Figures (c) and (d) show the charge-discharge curves of the Zn / / Zn symmetric batteries assembled with the PEGDA / ZnSO4 electrolytes of Examples 2 and 3, respectively, at different numbers of cycles.

[0026] Figure 4 For the Zn / / Cu half-cell at 2 mA / cm 2 The test results at current density are shown in Figure (a). Figure (a) shows the cycle performance and coulombic efficiency of the Zn / / Cu half-cell assembled with the PEGDA / ZnSO4 electrolytes of Examples 1-3 (PEGDA mass fractions of 0.01%, 0.03%, and 0.05%, respectively) and Comparative Example 1 (zinc sulfate electrolyte). Figure (b) shows the charge-discharge curves of the Zn / / Cu half-cell assembled in Example 1 for different numbers of cycles. Figures (c) and (d) show the charge-discharge curves of the Zn / / Cu half-cell assembled in Examples 2 and 3 for different numbers of cycles, respectively. Figure (e) shows the charge-discharge curves of the Zn / / Cu half-cell assembled with the ZnSO4 electrolyte of Comparative Example 1 for different numbers of cycles.

[0027] Figure 5 For Zn / / (NH4) x The constant current charge-discharge test results of the VO3 full cell at a current density of 5 A / g and a charge-discharge range of 0.4–1.8 V are shown in Figure (a). Figure (a) shows the Zn / (NH4) assembled with the PEGDA / ZnSO4 electrolytes of Examples 1–3 (PEGDA mass fractions of 0.01%, 0.03%, and 0.05%, respectively) and Comparative Example 1 (zinc sulfate electrolyte). x Specific capacity and coulombic efficiency diagrams of VO3 full cells. Figure (b) shows the Zn / / (NH4) assembled with PEGDA / ZnSO4 electrolyte in Example 1. x The charge-discharge curves of the VO3 full cell at different cycles are shown in Figure (c), which shows the Zn / / (NH4) assembled with the PEGDA / ZnSO4 electrolyte in Example 2. x The charge-discharge curves of the VO3 full cell at different cycles are shown in Figure (d), which shows the Zn / / (NH4) assembled with the PEGDA / ZnSO4 electrolyte in Example 3. x The charge-discharge curves of the VO3 full cell at different cell cycles are shown in Figure (e), which shows the Zn / / (NH4) assembled with zinc sulfate electrolyte in Comparative Example 1. x Charge-discharge curves of VO3 full batteries at different cycles.

[0028] Figure 6 Zn / / (NH4) assembled for Example 1 x CV plots of a full VO3 cell at different scan rates.

[0029] Figure 7 Three Zn / / (NH4) atoms assembled using Example 1 x Image of an LED light powered by a VO3 battery connected in series.

[0030] Figure 8Three Zn / / (NH4) atoms assembled using Example 1 x Voltage test diagram of VO3 full-cell series connection.

[0031] Figure 9 Physical displays of zinc sulfate electrolyte, PEGDA solution, and PEGDA / ZnSO4 electrolyte. Detailed Implementation

[0032] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In some embodiments of the present invention, a polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte is provided, the raw materials of which include polyethylene glycol diacrylate, water-soluble zinc salt and water; the mass fraction of the polyethylene glycol diacrylate is 0.01-0.1%, and the concentration of the water-soluble zinc salt is 1-5 mol / L.

[0034] Optionally, the mass fraction of the polyethylene glycol diacrylate is 0.01%.

[0035] Optionally, the concentration of the water-soluble zinc salt is 2 mol / L.

[0036] In other embodiments of the present invention, a method for preparing the above-mentioned polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte is provided, which involves completely dissolving the water-soluble zinc salt in water, adding the polyethylene glycol diacrylate dropwise, and mixing evenly to prepare the electrolyte.

[0037] Optionally, the water-soluble zinc salt is added to water and stirred for 5-10 minutes until completely dissolved.

[0038] Optionally, after adding the polyethylene glycol diacrylate, mix for 5-10 minutes until the mixture is homogeneous.

[0039] Specifically, taking zinc sulfate as a representative of water-soluble zinc salts, the preparation method of polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte is as follows: (1) Weigh 11.5g-58.5g of ZnSO4·7H2O into a small beaker using an electronic balance, add water to dilute to 20 mL, and stir continuously with a glass rod until the solid is completely dissolved, then pour into a glass bottle; (2) According to the preset mass fraction of polyethylene glycol diacrylate in the electrolyte, add polyethylene glycol diacrylate stock solution to the glass bottle, cover the bottle, shake the entire system evenly, and prepare the finished electrolyte.

[0040] In other embodiments of the present invention, an aqueous zinc-ion battery is also provided, the structure of which includes a positive electrode, a negative electrode, a separator, a gasket, a spring, a positive electrode shell, a negative electrode shell, and the above-mentioned polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte.

[0041] Example 1

[0042] The polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte provided in this embodiment is prepared by the following method:

[0043] (1) Weigh about 11.50 g of ZnSO4·7H2O into a small beaker using an electronic balance, then dilute it with water (distilled water or deionized water) to 20 ml, and stir continuously with a glass rod until completely dissolved, then pour it into a small glass bottle.

[0044] (2) Next, add polyethylene glycol diacrylate stock solution to the glass bottle, shake the entire glass bottle evenly, and the polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte (abbreviated as PEGDA / ZnSO4 electrolyte) can be prepared. Figure 9 As shown. In the final PEGDA / ZnSO4 electrolyte, the concentration of zinc sulfate was 2 mol / L, and the mass fraction of polyethylene glycol diacrylate was 0.01% (low concentration).

[0045] In this embodiment, aqueous zinc-ion batteries were also assembled and prepared using the above-mentioned PEGDA / ZnSO4 electrolyte. These aqueous zinc-ion batteries were Zn / / Zn symmetric cells, Zn / / Cu half-cells, and Zn / / (NH4) cells. x VO3 full battery.

[0046] (1) Assemble a Zn / / Zn symmetric cell. The specific method is as follows:

[0047] ① The Zn sheet is stamped into a 12 mm diameter disc as the negative electrode; Zn sheets of the same size are used as the positive electrode.

[0048] ② Place the Zn negative electrode sheet into the 2025 negative electrode shell, with the smooth side facing up;

[0049] ③ Place a glass fiber diaphragm with a diameter of 16 mm, and add 2-3 drops of PEGDA / ZnSO4 electrolyte to completely wet the glass fiber diaphragm;

[0050] ④ Place the Zn positive electrode plate above the glass fiber membrane, with the pure zinc plate facing down in contact with the membrane;

[0051] ⑤ Finally, place a 1.0 mm thick 304 stainless steel gasket and a 1.2 mm thick 304 stainless steel spring in sequence, attach the 2025 positive electrode shell, and seal the battery using a battery packaging machine to obtain a 2025 standard model Zn / / Zn aqueous zinc ion symmetric button battery.

[0052] (2) Assemble a Zn / / Cu half-cell

[0053] The assembly method of Zn / / Cu half-cell is basically the same as that of Zn / / Zn symmetric cell, except that the positive electrode in Zn / / Cu half-cell uses ordinary pure copper foil with a diameter of 12 mm.

[0054] (3) Assemble Zn / / (NH4) x VO3 full battery

[0055] Zn / / (NH4) x The assembly method for VO3 full cells is basically the same as that for Zn / / Zn symmetric cells, the difference being that Zn / / (NH4) x The negative electrode of the VO3 full cell uses a 15mm diameter Zn sheet, and Zn / / (NH4) x The positive electrode in a VO3 full cell uses (NH4). x VO3 positive electrode tablets.

[0056] (NH4) x The preparation method of VO3 positive electrode is as follows:

[0057] ① Dissolve 0.468 g NH4VO3 in deionized water at 70℃, add 0.7612 g thiourea, adjust the pH to 2.0 by adding dilute sulfuric acid dropwise, and stir at 90℃ for 2.5 h;

[0058] ② Filter, wash, and dry at 60℃ for 24 h to obtain (NH4). x VO3 cathode material;

[0059] ③ (NH4) x VO3 cathode material, acetylene black, and PVDF (polyvinylidene fluoride) are mixed in a mass ratio of 7:2:1. N-methylpyrrolidone is added to form a slurry, which is then coated onto carbon paper and dried at 60°C for 24 hours. The coating should have a strength of at least 2 mg / cm² after drying. 2 The material is cut into 12 mm diameter electrode sheets to obtain the positive electrode material.

[0060] Example 2

[0061] The preparation method of the PEGDA / ZnSO4 electrolyte in this embodiment is basically the same as that in Example 1. The difference is that after adding polyethylene glycol diacrylate stock solution in step (2), the mass fraction of polyethylene glycol diacrylate in the PEGDA / ZnSO4 electrolyte is 0.03% (medium concentration).

[0062] Example 3

[0063] The preparation method of the PEGDA / ZnSO4 electrolyte in this embodiment is basically the same as that in Example 1. The difference is that after adding polyethylene glycol diacrylate stock solution in step (2), the mass fraction of polyethylene glycol diacrylate in the PEGDA / ZnSO4 electrolyte is 0.05% (high concentration).

[0064] Comparative Example 1

[0065] This comparative example directly uses zinc sulfate solution as the electrolyte, such as Figure 9 As shown. The preparation method is the same as step (1) of Example 1.

[0066] Comparative Example 2

[0067] This comparative example directly uses a mixed solution of polyethylene glycol diacrylate and distilled water as the PEGDA solution, such as... Figure 9 As shown. The preparation method involves adding polyethylene glycol diacrylate stock solution dropwise to a glass bottle containing distilled water, shaking the entire bottle thoroughly to obtain a PEGDA solution. The mass fraction of polyethylene glycol diacrylate in the PEGDA solution is 0.01%.

[0068] Experimental Example 1: Electrolyte Performance Testing

[0069] The PEGDA / ZnSO4 electrolyte prepared in Example 1, the zinc sulfate electrolyte prepared in Comparative Example 1, and the PEGDA solution prepared in Comparative Example 2 were subjected to Fourier transform infrared spectroscopy and Raman spectroscopy tests, respectively.

[0070] Fourier transform infrared spectroscopy results are as follows Figure 1 As shown, ~2300-2500 cm -1 The region has a bimodal structure for SO4. 2- With Zn 2+ -The association of the PEGDA coordination structure reduces the symmetry of its surrounding environment and alters the microenvironment. Zn 2+ At ~1000 cm -1 Coordination occurred at the corresponding chemical bond (i.e., the -COC-ether bond of PEGDA). OH stretching vibration (~3300 cm⁻¹) -1 ) and -HOH- bending vibration (~1640 cm) -1The systematic shift of the above-mentioned interaction provides further evidence, reflecting that coordination leads to the reconstruction of the hydrogen bond network.

[0071] Raman spectroscopy test results as follows Figure 2 As shown. Figure 2 Middle, ~600 cm -1 The disappearance of the signal in the mixture indicates that Zn 2+ It detached from its hydrated structure and participated in the formation of new coordination bonds. ~1000 cm -1 The zinc sulfate solution at this point shows a relatively obvious peak (assigned to SO4). 2- The weakening or disappearance of this peak in the mixture (due to vibration) is a sign of SO4. 2- Direct evidence of microenvironment disruption due to coordination. The PEGDA solution belongs to the COC skeleton of PEGDA. The weakening signal in the mixture indicates the "reaction center" of the coordination interaction. ~1750-2000 cm⁻¹ -1 The broad peak appearing only in the mixture is a positive characteristic signal for the formation of new structures after coordination. ~3000-3500 cm⁻¹ -1 The OH stretching vibration signal is dramatically enhanced in the mixture, which is the most decisive evidence for the reconstruction of the hydrogen bond network by coordination.

[0072] Experimental Example 2: Performance Testing of Aqueous Zinc-Ion Batteries

[0073] 1. Zn / / Zn symmetric cell test

[0074] The Zn / / Zn symmetric cells assembled in Examples 1, 2, 3, and Comparative Example 1 were placed on a blue electric field testing system and tested at 2 mA / cm². 2 Constant current charge-discharge tests were conducted at the specified current density. The test followed a sequence of rest and constant current discharge, with each rest period lasting 30 seconds and the constant current charge-discharge time approximately 0.5 hours. The test results are as follows: Figure 3 As shown, it can be seen that the Zn / / Zn symmetric battery assembled with the PEGDA / ZnSO4 electrolyte of Example 1 has a much higher number of cycles than the Zn / / Zn symmetric batteries assembled with the electrolytes of Comparative Example 1, Example 2, and Example 3, demonstrating that it has stable cycle performance and can suppress dendrites.

[0075] 2. Zn / / Cu half-cell test

[0076] The Zn / / Cu symmetric cells assembled in Examples 1, 2, 3, and Comparative Example 1 were placed on a blue electric field testing system and tested at 2 mA / cm². 2 A constant current charge-discharge test was performed at the specified current density. The test results are as follows: Figure 4As shown, the Zn / / Cu half-cell assembled with the PEGDA / ZnSO4 electrolyte in Example 1 has a much higher number of cycles than the Zn / / Cu half-cells assembled with zinc sulfate electrolytes in Comparative Example 1, Example 2, and Example 3, exhibiting more stable cycling performance.

[0077] 3. Zn / / (NH4) x VO3 full battery test

[0078] Zn / / (NH4) were assembled using Examples 1, 2, 3, and Comparative Example 1, respectively. x The VO3 full cell was placed on a blue electric current testing system and subjected to constant current charge-discharge testing under conditions of 5 A / g current density and a charge-discharge range of 0.4–1.8 V. Charge-discharge curve testing and CV testing were performed on the full cell assembled using the PEGDA / ZnSO4 electrolyte prepared in Example 1. The scan rate for the CV test was set from 1 to 10 mV / s, and several cycles were recorded.

[0079] The charge-discharge curve test results are as follows Figure 5 As shown in Figure (a), the specific capacity of the battery (unit: mAh / g) changes with the number of cycle times. The battery capacity gradually decreases with cycling, especially the Zn / / (NH4) assembled in Example 1. x VO3 full-cell material exhibits the slowest capacity decay, indicating its superior performance. We will use full cells with different mass fractions of PEGDA additives and Zn / (NH4) electrolyte. x The charge-discharge curves of the VO3 full cell were tested, and the results are shown in Figures (b), (c), (d), and (e). The Zn / / (NH4) assembled in Example 1 was used. x The voltage curves of the VO3 full cell maintain a clear charge-discharge plateau at different cycle numbers, and the plateau decays slowly with increasing cycle number, indicating a low polarization voltage. In contrast, the curves using other electrolytes show significantly increased polarization with increasing cycle number.

[0080] CV test results as follows Figure 6 As can be seen, the oxidation peak is 1.214 V and the reduction peak is 0.799 V.

[0081] This experimental example uses the PEGDA / ZnSO4 electrolyte from Example 1 to assemble a full battery and connect them in series. After charging, the voltage is measured to verify whether it can light an LED. Figure 7 As shown, it can charge and discharge normally, and the LED light illuminates normally. Figure 8 As shown, the measured voltage is 4.672 V.

[0082] In summary, the results above all demonstrate that PEGDA significantly improves the cycle performance of batteries by regulating zinc ion deposition behavior, stabilizing the electrode interface, and optimizing electrochemical reaction kinetics.

[0083] The above detailed embodiments describe the implementation of the present invention; however, the present invention is not limited to the specific details described in the above embodiments. Within the scope of the claims and technical concept of the present invention, various simple modifications and changes can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

Claims

1. A polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte, characterized in that, Its raw materials include polyethylene glycol diacrylate, water-soluble zinc salt and water; the mass fraction of the polyethylene glycol diacrylate is 0.01-0.1%, and the concentration of the water-soluble zinc salt is 1-5 mol / L.

2. The polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte according to claim 1, characterized in that, The mass fraction of the polyethylene glycol diacrylate is 0.01%.

3. The polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte according to claim 1, characterized in that, The concentration of the water-soluble zinc salt is 2 mol / L.

4. The method for preparing the polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte according to any one of claims 1-3, characterized in that, It is prepared by completely dissolving the water-soluble zinc salt in water, adding the polyethylene glycol diacrylate dropwise, and mixing thoroughly.

5. The method for preparing the polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte according to claim 4, characterized in that, Add the water-soluble zinc salt to water and stir for 5-10 minutes until completely dissolved.

6. The method for preparing the polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte according to claim 4, characterized in that, After adding the polyethylene glycol diacrylate, mix for 5-10 minutes until the mixture is homogeneous.

7. The application of the polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte according to any one of claims 1-3, characterized in that, It is used as an electrolyte in the assembly and preparation of aqueous zinc-ion batteries.

8. An aqueous zinc-ion battery, characterized in that, The aqueous zinc-ion battery structure includes a positive electrode, a negative electrode, a separator, a gasket, a spring, a positive electrode shell, a negative electrode shell, and the polyethylene glycol diacrylate aqueous zinc-ion battery electrolyte as described in any one of claims 1-3.

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