Electroplating solution containing PEGDA additive, copper-zinc compound zinc negative electrode material and preparation method and application of copper-zinc compound zinc negative electrode material

Abstract

The invention discloses electroplating liquid containing a PEGDA additive, a copper-zinc compound zinc negative electrode material and a preparation method and application of the copper-zinc compound zinc negative electrode material. According to the electroplating solution, a solvent is water, and the electroplating solution comprises ZnSO4, Na2SO4 and PEGDA. According to the preparation method of the copper-zinc compound zinc negative electrode material, a copper foil serving as a working electrode and a zinc plate serving as a counter electrode are placed in the electroplating solution for electroplating treatment, and the copper-zinc compound zinc negative electrode material is obtained. According to the invention, a copper foil is used as a substrate, and a PEGDA additive is added by optimizing an electrochemical galvanizing process to prepare the copper-zinc compound. The additive PEGDA (polyethylene glycol diacrylate) is introduced into the electroplating solution, so that uniform deposition of zinc ions is realized, a zinc deposition substrate can be effectively improved, dendritic crystals are inhibited, side reactions are reduced, a more compact coating with better binding force is obtained, the mechanical strength and interface stability of a negative electrode are remarkably improved, and the performance of the aqueous zinc ion battery is improved.

Description

Technical Field

[0001] This invention relates to the field of aqueous zinc-ion battery technology, and in particular to an electroplating solution containing PEGDA additive, a copper-zinc composite zinc anode material, its preparation method, and its application. Background Technology

[0002] With the rapid development of global renewable energy (such as wind and solar power) and the urgent need for large-scale energy storage technologies that are "safe, low-cost, long-life, and environmentally friendly", aqueous zinc-ion batteries have become a highly promising solution. They use abundant, inexpensive, non-toxic, and easily recyclable zinc as the negative electrode and non-flammable aqueous solutions as the electrolyte, fundamentally solving the safety hazards of traditional lithium batteries and significantly reducing the cost of raw materials and the difficulty of battery manufacturing and recycling.

[0003] However, aqueous zinc-ion batteries also suffer from the inherent instability of the zinc anode. For example, dendrite growth can easily puncture the separator, leading to short circuits and shortening the battery's cycle life. Hydrogen evolution corrosion can also cause a series of chain reactions, severely impacting battery performance and safety. Copper current collectors are currently widely used zinc deposition substrates in the research and application of aqueous zinc-ion batteries, but they also face the inherent instability problem of the zinc anode. Summary of the Invention

[0004] The main objective of this invention is to provide an electroplating solution containing PEGDA additive, a copper-zinc composite zinc anode material, a preparation method thereof, and its application, aiming to solve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention provides an electroplating solution containing PEGDA additive, wherein the solvent is water and the components include ZnSO4, Na2SO4 and PEGDA.

[0006] Furthermore, the concentrations of ZnSO4 and Na2SO4 are both 0.1–1 mol / L, and they are in equal concentration ratio.

[0007] Furthermore, the mass fraction of PEGDA is 0.01–0.10%.

[0008] Furthermore, the concentrations of both ZnSO4 and Na2SO4 were 0.25 mol / L.

[0009] The present invention also provides a method for preparing a copper-zinc composite zinc anode material, comprising the following steps: using a copper foil as the working electrode and a zinc plate as the counter electrode, placing them in the above-mentioned electroplating solution for electroplating treatment to obtain the copper-zinc composite zinc anode material.

[0010] Furthermore, the current for the electroplating process is 10–150 mA / cm.2 The time is 10 to 150 minutes.

[0011] Furthermore, the thickness of the zinc coating on the copper-zinc composite zinc anode material is 1–3 μm.

[0012] The present invention also provides a copper-zinc composite zinc anode material, which is prepared according to the above preparation method.

[0013] The present invention also provides an application of the above-mentioned copper-zinc composite zinc anode material in an aqueous zinc-ion battery.

[0014] Furthermore, the application in aqueous zinc-ion batteries involves constructing aqueous zinc-ion batteries using copper-zinc composites.

[0015] The present invention also provides an aqueous zinc-ion battery, comprising the above-mentioned copper-zinc composite zinc anode material.

[0016] Furthermore, the aqueous zinc-ion battery includes a positive electrode, the aforementioned copper-zinc composite zinc negative electrode material, a separator, and an electrolyte.

[0017] This invention aims to solve the problem of performance degradation in aqueous zinc-ion batteries caused by zinc dendrites, corrosion and other side reactions, and to explore efficient and environmentally friendly modification strategies for aqueous zinc-ion anodes.

[0018] This invention relates to a copper-zinc composite prepared using copper foil as a substrate and an optimized electrochemical zinc plating process with PEGDA additive. Specifically, by introducing the additive PEGDA (polyethylene glycol diacrylate) into the electroplating solution, this invention achieves uniform zinc ion deposition, effectively improving the zinc deposition substrate, thereby suppressing dendrites, reducing side reactions, obtaining a denser coating with better adhesion, significantly improving the mechanical strength and interfacial stability of the negative electrode, and enhancing the performance of aqueous zinc-ion batteries.

[0019] Compared with traditional technologies, the beneficial effects of this invention are reflected in: 1. The copper-zinc composite zinc anode material prepared by this invention has extremely small grain size, extremely high density, and extremely low porosity, which can effectively inhibit dendrite growth and improve the electrochemical performance of the battery.

[0020] 2. The aqueous zinc-ion battery prepared using the copper-zinc composite zinc anode material of the present invention can effectively improve the zinc deposition substrate by introducing the additive PEGDA into the electroplating solution, thereby inhibiting dendrites, reducing side reactions, and improving the performance of the aqueous zinc-ion battery. It has excellent cycle stability, interface stability, coulombic efficiency, battery storage performance and reversibility.

[0021] 3. In the preparation method of the present invention, by changing the current and electroplating time, the distribution and thickness of the zinc coating on the copper foil surface can be adjusted, thereby obtaining the best modification effect, forming a denser, smoother and more uniform zinc deposition layer, and improving mechanical stability and electrochemical stability. Attached Figure Description

[0022] Figure 1 The images show a comparison of copper-zinc composite zinc anode materials prepared with electroplating solutions of different concentrations of PEGDA additives and ordinary copper foil zinc plating materials.

[0023] Figure 2 In the figure, (a) is a SEM image of copper-zinc composite zinc anode material (PEGDA (low concentration)-Cu@Zn), (b) is a SEM image of copper-zinc composite zinc anode material (PEGDA (medium concentration)-Cu@Zn), (c) is a SEM image of copper-zinc composite zinc anode material (PEGDA (high concentration)-Cu@Zn), and (d) is a SEM image of copper-zinc composite zinc anode material (ordinary-Cu@Zn).

[0024] Figure 3 These are XRD patterns of copper-zinc composite zinc anode materials: PEGDA (low concentration)-Cu@Zn, PEGDA (medium concentration)-Cu@Zn, PEGDA (high concentration)-Cu@Zn, ordinary-Cu@Zn, ordinary copper foil (Cu), and ordinary zinc foil (Zn).

[0025] Figure 4 Figures show the long-cycle performance of Zn / / Zn symmetric batteries assembled with negative electrode materials prepared according to various embodiments and comparative examples, as well as charge-discharge curves for different numbers of cycles. Figure (a) shows the long-cycle test results of these four full cells; (b), (c), (d), and (e) are the charge-discharge curves for Zn / / Zn symmetric batteries assembled with PEGDA (low concentration) - Cu@Zn, PEGDA (medium concentration) - Cu@Zn, PEGDA (high concentration) - Cu@Zn, and ordinary - Cu@Zn, respectively, for different numbers of cycles.

[0026] Figure 5 The figures show a comparison of the coulombic efficiency of Zn / / Cu half-cells assembled with negative electrode materials prepared according to various embodiments and comparative examples, as well as charge-discharge curves for different numbers of cycles. Figure (a) is a comparison of the coulombic efficiency of these four full cells; (b), (c), (d), and (e) are the charge-discharge curves for Zn / / Cu half-cells assembled with PEGDA (low concentration) - Cu@Zn, PEGDA (medium concentration) - Cu@Zn, PEGDA (high concentration) - Cu@Zn, and ordinary - Cu@Zn, respectively, for different numbers of cycles.

[0027] Figure 6The Zn / / (NH4) negative electrode materials were assembled using the various embodiments and comparative examples. x The discharge specific capacity diagram and single-cycle diagram of VO3 full cells within the same charge-discharge range are shown. Figure (a) shows the capacity test results of these four full cells; (b), (c), (d), and (e) represent Zn / / (NH4) assembled from PEGDA (low concentration) - Cu@Zn, PEGDA (medium concentration) - Cu@Zn, PEGDA (high concentration) - Cu@Zn, and ordinary - Cu@Zn, respectively. x Capacity-voltage diagram of VO3 full cells with different cell cycles.

[0028] Figure 7 It is a Zn / / (NH4) assembled from PEGDA (low concentration) - Cu@Zn. x Cyclic voltammetry (CV) performance test results of VO3 full cells.

[0029] Figure 8 It is a Zn / / (NH4) assembly composed of 3 PEGDA (low concentration) - Cu@Zn ions. x A voltage display diagram of a VO3 full battery connected in series.

[0030] Figure 9 It is a Zn / / (NH4) assembly composed of 3 PEGDA (low concentration) - Cu@Zn ions. x Test of a light bulb lit by a VO3 full battery connected in series. Detailed Implementation

[0031] To enable those skilled in the art to more clearly understand the technical solutions described in this invention, the following embodiments are provided for illustration. It should be noted that the following embodiments do not constitute a limitation on the scope of protection claimed by this invention.

[0032] Unless otherwise specified, the raw materials, reagents or devices used in the following embodiments can be obtained from conventional commercial sources or by existing known methods; unless otherwise specified, the methods used in the embodiments of the present invention are methods mastered by those skilled in the art.

[0033] The electrochemical workstation, model ChI660E, was purchased from Shanghai Chenhua Instrument Co., Ltd.

[0034] Example 1 Preparation of copper-zinc composite zinc anode material (1) Preparation of electroplating solution ZnSO4, Na2SO4 and PEGDA were added to deionized water. The concentrations of each component were as follows: ZnSO4 and Na2SO4 were both 0.25 mol / L, and the mass fraction of PEGDA was 0.01%.

[0035] (2) Pretreatment before electroplating Clean the copper foil (0.02 mm thick) and zinc plate (1 mm thick) with deionized water, dry them, and then cut them into squares with sides of 5 cm × 5 cm.

[0036] (3) Electroplating treatment The electroplating solution was added to the electrochemical workstation, and the workstation was programmed with the initial current and time set to 0, and the electroplating current set to 25 mA / cm². 2 The electroplating time is set to 1 hour.

[0037] Place the cut copper foil on the working electrode of the electrochemical workstation, and place the cut zinc plate on the counter electrode of the electrochemical workstation, so that the copper foil and zinc plate face each other with a 2cm gap between them. Finally, immerse the electrode in the electroplating solution (80mL) and perform electroplating according to the programmed procedure.

[0038] (4) Post-electroplation treatment After electroplating, the material on the working electrode is removed and rinsed with deionized water to obtain a copper-zinc composite zinc anode material for aqueous zinc-ion batteries, denoted as PEGDA (low concentration)-Cu@Zn.

[0039] Example 2 Preparation of copper-zinc composite zinc anode material The preparation method in this embodiment is the same as in Example 1, except that the concentrations of ZnSO4 and Na2SO4 in the electroplating solution are both 0.25 mol / L, and the mass fraction of PEGDA is 0.03%. The copper-zinc composite zinc anode material finally obtained in this embodiment is denoted as PEGDA (medium concentration)-Cu@Zn.

[0040] Example 3 Preparation of copper-zinc composite zinc anode material The preparation method in this embodiment is the same as in Example 1, except that the concentrations of ZnSO4 and Na2SO4 in the electroplating solution are both 0.25 mol / L, and the mass fraction of PEGDA is 0.05%. The copper-zinc composite zinc anode material finally obtained in this embodiment is denoted as PEGDA (high concentration)-Cu@Zn.

[0041] Example 4 Battery assembly Three types of batteries were fabricated using the PEGDA (low concentration)-Zn@Cu prepared in Example 1, as detailed below: (1) Assemble a Zn / / Zn symmetric cell The assembly process is as follows: First, two 12 mm diameter discs of PEGDA (low concentration)-Zn@Cu are stamped out, serving as the positive and negative electrodes, respectively. Then, the PEGDA (low concentration)-Zn@Cu negative electrode is placed into a 2025 negative electrode shell with the smooth side facing upwards. Next, a 16 mm diameter glass fiber separator is placed in, and two drops of a 2 mol / L zinc sulfate solution are added as the electrolyte to wet the glass fiber separator. Then, the PEGDA (low concentration)-Zn@Cu positive electrode is placed on top of the glass fiber separator, with the zinc-plated side facing downwards in contact with the separator. Finally, a 1.0 mm thick 304 stainless steel gasket and a 1.2 mm thick 304 stainless steel spring are placed in sequence, the 2025 positive electrode shell is attached, and the battery is sealed using a battery packaging machine, thus obtaining a 2025 standard model Zn / / Zn symmetric aqueous zinc-ion symmetric button cell.

[0042] (2) Assemble a Zn / / Cu half-cell The assembly process is the same as that of the Zn / / Zn symmetric cell in step (1), except that the positive electrode is replaced with a copper foil with a diameter of 12 mm (thickness of 0.02 mm) to obtain a Zn / / Cu half cell.

[0043] (3) Assemble Zn / / (NH4) x VO3 full battery The assembly process is the same as that of the Zn / / Zn symmetrical cell in step (1), the only difference being that the positive electrode is replaced with (NH4). x The size of the VO3 electrode and the PEGDA (low concentration)-Zn@Cu negative electrode were adjusted to a diameter of 15 mm to obtain a Zn / / (NH4) anode. x VO3 full battery.

[0044] Among them, (NH4) x The preparation method of VO3 electrode is as follows: First, 0.468 g of NH4VO3 is dissolved in 250 ml of 70℃ deionized water, then 0.7612 g of thiourea is added, and dilute sulfuric acid is added dropwise to adjust the pH to 2.0. The mixture is stirred at 90℃ for 2.5 h. Then, it is filtered, washed with deionized water, and dried at 60℃ for 24 h to obtain (NH4). x VO3 cathode material; finally, (NH4) x VO3 cathode material, acetylene black, and PVDF (polyvinylidene fluoride) were mixed in a mass ratio of 7:2:1. 2 ml of N-methylpyrrolidone was added to prepare a slurry, which was then coated onto carbon paper and dried at 60°C for 24 hours. After drying, the coating thickness was 2 mg / cm². 2 It is cut into electrodes with a diameter of 12 mm.

[0045] Example 5 Battery assembly Three types of batteries were fabricated using the PEGDA (medium concentration)-Zn@Cu prepared in Example 2, as detailed below: (1) Assemble a Zn / / Zn symmetric cell The assembly process is the same as step (1) in Example 4, except that the positive and negative electrodes are replaced with PEGDA (medium concentration)-Zn@Cu.

[0046] (2) Assemble a Zn / / Cu half-cell The assembly process is the same as step (2) in Example 4, except that the negative electrode is replaced with PEGDA (medium concentration)-Zn@Cu.

[0047] (3) Assemble Zn / / (NH4) x VO3 full battery The assembly process is the same as step (3) in Example 4, except that the negative electrode is replaced with PEGDA (medium concentration)-Zn@Cu.

[0048] Example 6 Battery assembly Three types of batteries were fabricated using the PEGDA (high concentration)-Zn@Cu prepared in Example 3, as detailed below: (1) Assemble a Zn / / Zn symmetric cell The assembly process is the same as step (1) in Example 4, except that the positive and negative electrodes are replaced with PEGDA (high concentration)-Zn@Cu.

[0049] (2) Assemble a Zn / / Cu half-cell The assembly process is the same as step (2) in Example 4, except that the negative electrode is replaced with PEGDA (high concentration)-Zn@Cu.

[0050] (3) Assemble Zn / / (NH4) x VO3 full battery The assembly process is the same as step (3) in Example 4, except that the negative electrode is replaced with PEGDA (high concentration)-Zn@Cu.

[0051] Comparative Example 1 Comparison of copper-zinc composite zinc anode materials The preparation method for this comparative example is the same as in Example 1, except that PEGDA is omitted from the electroplating solution. This comparative example ultimately yields a common copper-zinc composite zinc anode material, denoted as Common-Cu@Zn.

[0052] Comparative Example 2 Comparison of battery assembly This comparative example uses the ordinary Cu@Zn obtained in Comparative Example 1 to prepare three types of batteries, as follows: (1) Assemble a Zn / / Zn symmetric cell The assembly process is the same as step (1) in Example 4, except that the positive and negative electrode sheets are replaced with ordinary Cu@Zn.

[0053] (2) Assemble a Zn / / Cu half-cell The assembly process is the same as step (2) in Example 4, except that the negative electrode is replaced with ordinary Cu@Zn.

[0054] (3) Assemble Zn / / (NH4) x VO3 full battery The assembly process is the same as step (3) in Example 4, except that the negative electrode is replaced with ordinary Cu@Zn.

[0055] Experimental Example 1 Structural determination of copper-zinc composite zinc anode material Photos of the PEGDA (low concentration)-Cu@Zn prepared in Example 1, the PEGDA (medium concentration)-Cu@Zn prepared in Example 2, the PEGDA (high concentration)-Cu@Zn prepared in Example 3, and the ordinary-Cu@Zn prepared in Comparative Example 1 are shown below. Figure 1 As shown, the material prepared using PEGDA additives can be seen to achieve extremely fine grains in the copper plating by inhibiting crystal growth and increasing nucleation sites, thereby guiding uniform deposition, effectively suppressing zinc dendrites, enhancing electrode structural stability, and extending battery cycle life.

[0056] The XRD patterns of PEGDA (low concentration)-Cu@Zn prepared in Example 1, PEGDA (medium concentration)-Cu@Zn prepared in Example 2, PEGDA (high concentration)-Cu@Zn prepared in Example 3, ordinary-Cu@Zn prepared in Comparative Example 1, ordinary copper foil, and ordinary zinc foil are shown below. Figure 3 As shown. X-ray diffraction (XRD) characterization revealed that the peak intensity ratio of I(101) / I(002) in PEGDA (low concentration)-Cu@Zn was 5.67, in ordinary-Cu@Zn it was 1.16, in PEGDA (medium concentration)-Cu@Zn it was 4.26, and in PEGDA (high concentration)-Cu@Zn it was 3.60. The (101) crystal plane had the largest proportion in PEGDA (low concentration)-Cu@Zn. This indicates that after modification with PEGDA (low concentration), the deposited zinc grains exhibit a stronger (101) preferred orientation. This (101) orientation can induce Zn... 2+Uniform deposition forms a dense structure, effectively suppressing zinc dendrites and side reactions. As can be seen, Zn and Cu are consistent with the standard PDF card (used to analyze the presence of this substance; if the characteristic peaks of the XRD in the raw material match those on the PDF card, it indicates a high content of the material with virtually no impurities), indicating high sample purity. The characteristic peaks of PEGDA (low concentration)-Cu@Zn in the figure are consistent with those of Zn, indicating successful Zn deposition on the surface of the copper foil.

[0057] SEM images of Example 1 (low concentration PEGDA-Cu@Zn), Example 2 (medium concentration PEGDA-Cu@Zn), Example 3 (high concentration PEGDA-Cu@Zn), and Comparative Example 1 (normal-Cu@Zn) are shown below. Figure 2 As shown in the figure, the copper-zinc composite zinc anode material with PEGDA additive exhibits a fibrous structure, while ordinary Cu@Zn shows a disordered structure. This indicates that the PEGDA additive can increase the nucleation sites of zinc ions and guide Zn formation. 2+ Uniform deposition effectively suppresses dendrite formation, thereby significantly improving the electrochemical performance of aqueous zinc-ion batteries.

[0058] Experiment Example 2 Zinc-ion battery performance testing I. Zn / / Zn Symmetric Cell Test Zn / / Zn symmetric cells assembled using PEGDA (low concentration)-Cu@Zn from Example 1, PEGDA (medium concentration)-Cu@Zn from Example 2, PEGDA (high concentration)-Cu@Zn from Example 3, and ordinary-Cu@Zn from Comparative Example 1 were tested on a blue electric field testing system 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 long-cycle performance test results are as follows: Figure 4 As shown in Figure (a), it can be seen that the PEGDA (low concentration)-Cu@Zn / / PEGDA (low concentration)-Cu@Zn symmetric cells have a higher cycle life.

[0059] II. Zn / / Cu half-cell test Zn / / Cu half-cells assembled using PEGDA (low concentration)-Cu@Zn from Example 1, PEGDA (medium concentration)-Cu@Zn from Example 2, PEGDA (high concentration)-Cu@Zn from Example 3, and ordinary-Cu@Zn from Comparative Example 1 were tested on a blue electric field testing system 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 5As shown in Figure (a), it can be seen that the Zn / / Cu half-cell assembled by PEGDA (low concentration)-Cu@Zn in Example 1 has a much higher number of cycles than the Zn / / Cu half-cells assembled by Example 2 (PEGDA (medium concentration)-Cu@Zn), Example 3 (PEGDA (high concentration)-Cu@Zn), and Comparative Example 1 (normal-Cu@Zn), exhibiting more stable cycling performance.

[0060] III. Full Battery Test Zn / / (NH4) were assembled using PEGDA (low concentration)-Cu@Zn from Example 1, PEGDA (medium concentration)-Cu@Zn from Example 2, PEGDA (high concentration)-Cu@Zn from Example 3, and ordinary-Cu@Zn from Comparative Example 1, respectively. x The VO3 full battery was tested on the Blue Electric testing system under constant current charge and discharge conditions of 5 A / g and a charge-discharge range of 0.4-1.8 V. The test results for the storage performance (discharge specific capacity and single-cycle performance) of these four full batteries are as follows: Figure 6 As shown in Figure (a), the initial capacity of the Example 1 (PEGDA (low concentration)-Cu@Zn) full cell reaches over 180 mAh / g at a current density of 5 A / g. After long-term cycling, the capacity decay value is still lower than that of Example 2 (PEGDA (medium concentration)-Cu@Zn), Example 3 (PEGDA (high concentration)-Cu@Zn), and Comparative Example 1 (ordinary-Cu@Zn) full cells, exhibiting a higher capacity. The capacity curves in Figures (b), (c), (d), and (e) show that (where the positive slope curve is the charging curve, which shows the trend of charging capacity with voltage change, indicating the charging plateau; the negative slope curve is the discharging curve, which shows the trend of discharging capacity decreasing with voltage change, reflecting the discharging plateau) in the battery system with Example 1 (PEGDA (low concentration)-Cu@Zn) as the negative electrode, the polarization voltage is smaller and the capacity plateau is flatter, with a higher curve fit. The stable voltage curve plateau as a whole reflects the good compatibility of this positive and negative electrode and separator combination. At the same number of cycles, the discharge specific capacity of the Example 1 (PEGDA (low concentration)-Cu@Zn) full cell is superior to that of Example 2 (PEGDA (medium concentration)-Cu@Zn), Example 3 (PEGDA (high concentration)-Cu@Zn), and Comparative Example 1 (ordinary-Cu@Zn) full cells. This indicates that Example 1 (PEGDA (low concentration)-Cu@Zn) as the negative electrode can significantly improve the long-term cycle stability of zinc-ion batteries.

[0061] Furthermore, the negative electrode material is made of PEGDA (low concentration)-Cu@Zn with Zn / / (NH4). xCyclic voltammetry (CV) performance tests were conducted on the VO3 full cell. Scan rates were set from 1 to 10 mV / s, and several cycles were recorded. The results are as follows: Figure 7 As shown, the potential of the oxidation peak is approximately 1.214 V, which corresponds to VO x - The oxidation process. The reduction peak potential is approximately 0.776 V, corresponding to VO. x - The reduction process was observed. The measured peaks were sharp, indicating that the PEGDA (low concentration)-Cu@Zn anode material has good reversibility.

[0062] Furthermore, the anode material was prepared using PEGDA (low concentration)-Cu@Zn with three Zn / / (NH4) atoms. x A series connection of VO3 batteries was made, and after charging, the voltage was measured, as well as whether it could light up an LED light. The results are as follows. Figure 8 and Figure 9 As shown, the voltage is 4.250V, which can light up the LED, allowing it to charge and discharge normally and light up the LED normally.

[0063] All of the above results indicate that PEGDA significantly improves the cycle performance of the battery by regulating zinc ion deposition behavior, stabilizing the electrode interface, and optimizing electrochemical reaction kinetics.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An electroplating solution containing PEGDA additive, characterized in that, The solvent is water, and the components include ZnSO4, Na2SO4 and PEGDA.

2. The electroplating solution containing PEGDA additive as described in claim 1, characterized in that, The concentrations of ZnSO4 and Na2SO4 are both 0.1–1 mol / L, and they are in equal concentration ratio.

3. The electroplating solution containing PEGDA additive as described in claim 1 or 2, characterized in that, The mass fraction of PEGDA is 0.01–0.10%.

4. The electroplating solution containing PEGDA additive as described in claim 1 or 2, characterized in that, The concentrations of both ZnSO4 and Na2SO4 were 0.25 mol / L.

5. A method for preparing a copper-zinc composite zinc anode material, characterized in that, Includes the following steps: Using copper foil as the working electrode and zinc plate as the counter electrode, the copper-zinc composite zinc anode material is obtained by electroplating in the electroplating solution as described in any one of claims 1 to 4.

6. The method for preparing the copper-zinc composite zinc anode material as described in claim 5, characterized in that, The current for electroplating is 10–150 mA / cm. 2 The time is 10 to 150 minutes.

7. The method for preparing the copper-zinc composite zinc anode material as described in claim 5, characterized in that, The thickness of the zinc coating on the copper-zinc composite zinc anode material is 1–3 μm.

8. A copper-zinc composite zinc anode material, characterized in that, Prepared according to the preparation method described in claim 5, 6 or 7.

9. The application of the copper-zinc composite zinc anode material as described in claim 8 in an aqueous zinc-ion battery.

10. An aqueous zinc-ion battery, characterized in that, Including the copper-zinc composite zinc anode material as described in claim 8.

Images