Aqueous zinc ion battery negative electrode material with amino group coating as well as preparation method and application of aqueous zinc ion battery negative electrode material

Abstract

The invention relates to the technical field of electrochemical energy storage, in particular to an aqueous zinc ion battery negative electrode material with an amino group coating as well as a preparation method and application of the aqueous zinc ion battery negative electrode material. The preparation method comprises the following steps: adding aminated silicon dioxide and a binder into an agate mortar, and grinding to obtain mixed powder of the aminated silicon dioxide and the binder; and then transferring the mixed powder of the aminated silicon dioxide and the binder into a stirring container, then adding an organic solvent, stirring and mixing to obtain aminated silicon dioxide coating slurry, then coating the aminated silicon dioxide coating slurry on a zinc negative electrode in a blade coating manner, and drying to obtain the aminated silicon dioxide coating. The aqueous zinc ion battery negative electrode material with the amino group coating prepared by the invention can promote efficient transmission of zinc ions, reduce concentration polarization, guide uniform deposition of the zinc ions, avoid zinc dendritic crystal growth caused by overhigh local concentration, improve the capacity and coulombic efficiency of a total battery, and improve the service life of the battery. The commercialization of the water-based zinc ion battery is favorably realized.

Description

Technical Field

[0001] This invention relates to the field of electrochemical energy storage technology, specifically to an aqueous zinc-ion battery anode material with an amino group coating, its preparation method, and its application. Background Technology

[0002] In recent years, with the popularization of portable smart devices and the rapid development of the electric vehicle industry, the market demand for battery performance has become higher, requiring energy storage batteries with high specific capacity, high power density, long cycle life, and green safety. Lithium-ion batteries have achieved commercial application, but problems such as flammable and toxic organic electrolytes, limited lithium resources, short cycle life, and pollution in the production environment seriously limit their further large-scale application in the field of energy storage batteries.

[0003] Therefore, under the rigid constraints of the "dual carbon" policy and the guidance of the green development concept, developing a new generation of battery systems that combine economy, safety, and high efficiency is not only an inevitable choice to break through the current bottlenecks in energy storage technology, but also a key support for promoting a deep adjustment of the energy structure and accelerating the achievement of the goals of "carbon peaking and carbon neutrality." Aqueous zinc-ion batteries are a promising alternative to lithium-ion batteries. Zinc, as the battery's negative electrode material, possesses a low redox potential (-0.762V vs. SHE) and a high theoretical specific capacity (5855mAh cm⁻¹). -3 820mAh g -1 Zinc has advantages such as abundant resources. Furthermore, compared to organic electrolytes used in lithium-ion batteries, zinc's compatibility with aqueous electrolytes offers key advantages, including higher ionic conductivity, lower toxicity, higher safety, lower cost, and a simpler production process.

[0004] However, the long-term stability of the cycling performance of aqueous zinc-ion batteries is often limited by the zinc metal anode material. Zinc metal anode materials face a series of challenges during cycling, including corrosion, hydrogen evolution, and uncontrolled zinc dendrite growth. In particular, irregular zinc dendrite growth caused by uneven zinc stripping and deposition not only reduces the overall energy storage efficiency and battery life but may also puncture the separator, leading to a short circuit. To improve these defects, researchers in this field have tried various strategies, such as separator modification, electrolyte optimization, interface modification engineering, and zinc alloy anodes. These strategies optimize the interface between the electrolyte and the zinc metal anode by adjusting the interfacial electric field and ion distribution. Due to its simple preparation and wide range of applications, constructing artificial interface protective coatings is considered an effective strategy to suppress zinc dendrite growth and side reactions.

[0005] However, the selection and preparation processes of existing artificial interface protective coating materials still have shortcomings. On the one hand, some materials have poor physical and electrochemical stability, making it difficult to maintain protective performance during long-term cycling; on the other hand, even if some materials meet the stability standards, they often lack active sites, making it impossible to effectively regulate zinc ion transport, ultimately leading to a decrease in battery efficiency. Therefore, developing protective layer materials that combine high stability and good zinc wettability has become the key to breaking through the performance bottleneck of aqueous zinc-ion batteries. Summary of the Invention

[0006] The main objective of this invention is to address the aforementioned problems and overcome the shortcomings of existing aqueous zinc-ion battery anode protection technologies, such as high cost, easy coating peeling, and insufficient cycle stability. This invention provides an aqueous zinc-ion battery anode material with an amino group coating, its preparation method, and its application. This material can effectively suppress zinc dendrite growth and side reactions in the zinc anode. Furthermore, the preparation method is simple, low-cost, and suitable for large-scale production.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0008] This invention provides an aqueous zinc-ion battery anode material with an amino group coating. The aqueous zinc-ion battery anode material with an amino group coating is obtained by coating an aminated silica coating slurry onto a zinc anode and then drying it. The aminated silica coating slurry includes aminated silica, a binder, and an organic solvent.

[0009] Preferably, the thickness of the aminated silica coating is 10-20 μm.

[0010] Preferably, the mass ratio of aminated silica to binder in the aminated silica coating is 8:2.

[0011] Preferably, the adhesive comprises polyvinylidene fluoride and polytetrafluoroethylene.

[0012] Preferably, the thickness of the zinc anode is 50-100 μm.

[0013] This invention also protects a method for preparing an aqueous zinc-ion battery anode material with an amino group coating as described above, comprising the following steps:

[0014] S1. Add aminated silica and binder to an agate mortar and grind to obtain a mixed powder of aminated silica and binder.

[0015] S2. Transfer the mixed powder of aminated silica and binder from step S1 to a stirring container, then add an organic solvent and stir to mix, to obtain an aminated silica coating slurry, which is then coated onto the zinc anode and dried to obtain the aqueous zinc-ion battery anode material.

[0016] Preferably, the grinding time in step S1 is 10-30 min.

[0017] Preferably, the stirring speed in step S2 is 300-600 rpm. -1 The stirring time is 6-8 hours, and the temperature is 20-30℃.

[0018] Preferably, in step S2, the drying temperature is 50-80℃ and the drying time is 8-12h.

[0019] The present invention also provides the application of the aqueous zinc-ion battery anode material with amino group coating described in the above technical solution or the aqueous zinc-ion battery anode material with amino group coating prepared by the preparation method described in the above technical solution in an aqueous zinc-ion battery. The method involves slicing the aqueous zinc-ion battery anode material with amino group coating to obtain an electrode sheet, which is then used as the anode of the aqueous zinc-ion battery.

[0020] Preferably, the electrode sheet is a circular electrode sheet with a diameter of 12-16 mm.

[0021] Preferably, the positive electrode of the aqueous zinc-ion battery is a Ketjen black / iodine (KJ / I2) electrode sheet, the separator is a GF / D standard glass fiber separator, and the electrolyte is a 2M ZnSO4 solution.

[0022] Preferably, the amount of electrolyte used is 80-100 μL.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The aqueous zinc-ion battery anode material with amino group coating provided by the present invention is obtained by scraping an aminated silica coating slurry onto a zinc anode and drying it. Due to the hydrophilicity of the amino groups and their affinity for zinc, the ion transfer kinetics of the zinc anode are significantly optimized. They can promote the efficient transport of zinc ions and reduce concentration polarization, guide the uniform deposition of zinc ions, and avoid the growth of zinc dendrites caused by excessively high local concentrations.

[0025] (2) The aqueous zinc-ion battery anode material with an amino group coating provided by the present invention has a dense aminated silica coating that can serve as a buffer barrier between the zinc anode and the electrolyte, thereby ensuring uniform electrolyte flux. Simultaneously, the amino groups on the coating surface can form specific coordination interactions with zinc ions, resulting in directional adsorption and transport regulation of zinc ions. This effectively inhibits the local aggregation of zinc ions on the zinc anode surface, thereby inducing uniform deposition of zinc ions along the anode surface.

[0026] (3) The aqueous zinc-ion battery anode material with amino group coating provided by the present invention is easy to prepare, low in cost, environmentally friendly, requires no complicated equipment, and is suitable for large-scale production.

[0027] (4) The aqueous zinc-ion battery anode material with amino group coating provided by the present invention can effectively improve the cycle performance of aqueous zinc-ion batteries, enable aqueous zinc-ion batteries to have a good and stable deposition / stripping process, help improve the capacity and coulombic efficiency of aqueous zinc-ion batteries, and promote the commercialization of aqueous zinc-ion batteries. Attached Figure Description

[0028] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0029] Figure 1 The image shows a scanning electron microscope (SEM) image of the aqueous zinc-ion battery anode material with an amino group coating prepared in Example 1 of this invention.

[0030] Figure 2 The X-ray diffraction (XRD) patterns of aminated silica in Example 1 and silica in Comparative Example 1 are shown below.

[0031] Figure 3 Fourier transform infrared (FTIR) spectra of aminated silica in Example 1 and silica in Comparative Example 1 of the present invention;

[0032] Figure 4 Comparative figures show the long-cycle stability tests of the aqueous zinc-ion battery anode material (NH2-SiO2@Zn) with amino group coating prepared in Example 1 of this invention, the aqueous zinc-ion battery anode material (SiO2@Zn) without amino group coating prepared in Comparative Example 1, and the NH2-SiO2@Zn / / NH2-SiO2@Zn, SiO2@Zn / / SiO2@Zn, and Bare Zn / / Bare Zn symmetric batteries assembled from the zinc anodes, respectively.

[0033] Figure 5 The graph shows a performance comparison of the aqueous zinc-ion battery anode material (NH2-SiO2@Zn) with amino group coating prepared in Example 1 of the present invention, the aqueous zinc-ion battery anode material (SiO2@Zn) without amino group coating prepared in Comparative Example 1, and the zinc anodes assembled with NH2-SiO2@Zn / / Cu, SiO2@Zn / / Cu, and Bare Zn / / Cu zinc-copper half-cells, respectively.

[0034] Figure 6 The graph shows a performance comparison of the aqueous zinc-ion battery anode material (NH2-SiO2@Zn) with amino group coating prepared in Example 1 of this invention, the aqueous zinc-ion battery anode material (SiO2@Zn) without amino group coating prepared in Comparative Example 1, and the zinc anodes assembled with NH2-SiO2@Zn / / KJ / I2@Ti, SiO2@Zn / / KJ / I2@Ti, and Bare Zn / / KJ / I2@Ti zinc-iodine full cells, respectively. Detailed Implementation

[0035] The present invention will be described in detail below with reference to the embodiments. However, it should be understood that the following embodiments are merely illustrative examples of the implementation of the present invention and are not intended to limit the scope of the present invention.

[0036] The zinc anode used in the following embodiments of the present invention was prepared according to the following method:

[0037] Zinc foil with a thickness of 80 μm and a purity of 99.99% was ultrasonically cleaned with anhydrous ethanol for 10 min, followed by ultrasonic cleaning with deionized water for 10 min, and then dried in a vacuum oven at 60 °C for 10 h to obtain a clean zinc anode.

[0038] The aminated silica in the following embodiments of the present invention is prepared according to the following steps:

[0039] 2 mL of tetraethyl orthosilicate (TEOS) was added to 50 mL of ethanol and 75 mL of deionized water and stirred evenly for 10 minutes. Then, 1 mL of 28% ammonia solution was added dropwise and stirred evenly for 10 hours. Next, 0.2 g of potassium permanganate was added and stirred for another 4 hours. Then, hydrochloric acid and hydrogen peroxide were added until the solution turned white. The resulting white silica powder was then washed and dried. 1.5 g of the generated white silica powder was taken, 30 mL of methanol was added, and then 0.5 mL of N-(3-(trimethoxysilyl)propyl)ethylenediamine (AEAP) was added. The mixture was stirred for 4 hours, then washed and dried to obtain the final product.

[0040] The KJ / I2 electrode sheet in the following embodiments of the present invention is prepared according to the following steps:

[0041] 0.05 g of Ketjen black (KJ) and 0.15 g of iodine (I2) were placed in a sealed Teflon liner and heated at 130 °C for 5 h in an argon atmosphere. After cooling to room temperature, the sample was removed and heated at 130 °C for 3 h in air to remove excess iodine. The final product was named KJ / I2. KJ / I2, conductive carbon black (Super P), and polyvinylidene fluoride (PVDF) were taken in a mass ratio of 8:1:1, and an appropriate amount of N-methylpyrrolidone (NMP) was added. The mixture was stirred evenly to obtain a positive electrode slurry. The positive electrode slurry was coated onto titanium foil (Ti) using a four-sided coating tool and dried at 60 °C under vacuum for 24 h. The slurry was then cut into circular electrode sheets with a diameter of 14 mm.

[0042] Example 1

[0043] S1. Add 0.32g of aminated silica and 0.08g of polyvinylidene fluoride (PVDF) to an agate mortar and grind for 20 minutes to obtain a mixed powder of aminated silica and binder.

[0044] S2. Transfer the mixed powder of aminated silica and binder from step S1 to a mixing container, then add 1.8 mL of N-methylpyrrolidone (NMP) and stir to mix at a speed of 300 rpm. -1 The stirring time was 6 hours and the temperature was 25°C to obtain an aminated silica coating slurry, which was then coated onto the zinc anode and dried at 60°C for 12 hours. The slurry was then cut into circular electrode sheets with a diameter of 14 mm to obtain the aqueous zinc-ion battery anode material with an amino group coating, denoted as NH2-SiO2@Zn.

[0045] Comparative Example 1

[0046] S1. Add 0.32g of silicon dioxide and 0.08g of polyvinylidene fluoride (PVDF) to an agate mortar and grind for 20 minutes to obtain a mixed powder of silicon dioxide and binder.

[0047] S2. Transfer the mixed powder of silica and binder from step S1 to a mixing container, then add 1.8 mL of N-methylpyrrolidone (NMP) and stir to mix at a speed of 300 rpm. -1 The stirring time was 6 hours and the temperature was 25°C to obtain a silica coating slurry, which was then coated onto the zinc anode and dried at 60°C for 12 hours. The slurry was then cut into circular electrode sheets with a diameter of 14 mm to obtain the aqueous zinc-ion battery anode material without amino group coating, denoted as SiO2@Zn.

[0048] Application Example 1: Assembling a symmetrical battery

[0049] The amino-coated aqueous zinc-ion battery negative electrode material prepared in Example 1 was used as the positive and negative electrodes of a button cell. An NH2-SiO2@Zn / / NH2-SiO2@Zn symmetrical battery was assembled in air, using a CR2032 battery case. The assembly sequence of the aqueous zinc-ion battery was as follows: negative electrode case, spring clip, gasket, amino-coated aqueous zinc-ion battery negative electrode material, GF / D standard glass fiber separator (18 mm diameter), addition of 80 μL of electrolyte (2 M ZnSO4 solution) using a pipette, amino-coated aqueous zinc-ion battery negative electrode material, gasket, positive electrode case. The battery was then sealed using a battery sealing machine at a sealing pressure of 50 kg cm⁻¹. -2 This results in the formation of an NH2-SiO2@Zn / / NH2-SiO2@Zn symmetric cell.

[0050] The aqueous zinc-ion battery anode material without amino group coating prepared in Comparative Example 1 was used as the positive and negative electrodes of a button cell. A SiO2@Zn / / SiO2@Zn symmetric cell was assembled in air, using a CR2032 battery case. The assembly sequence of the aqueous zinc-ion battery was as follows: negative electrode case, spring clip, gasket, aqueous zinc-ion battery anode material without amino group coating, GF / D standard glass fiber separator (18 mm diameter), 80 μL of electrolyte (2 M ZnSO4 solution) added using a pipette, aqueous zinc-ion battery anode material without amino group coating, gasket, positive electrode case. The battery was then sealed using a battery sealing machine at a sealing pressure of 50 kg cm⁻¹. -2 This results in a SiO2@Zn / / SiO2@Zn symmetric cell.

[0051] The bare zinc electrode symmetric cell is assembled in the same way as above. The positive and negative electrodes directly use zinc negative electrodes with a diameter of 14mm, which is denoted as Bare Zn / / Bare Zn symmetric cell.

[0052] Application Example 2: Assembling a zinc-copper half-cell

[0053] The aqueous zinc-ion battery negative electrode material with amino group coating prepared in Example 1 was used as the negative electrode of a button cell, and a copper foil with a diameter of 14 mm was used as the positive electrode. An NH2-SiO2@Zn / / Cu zinc-copper half-cell was assembled in air, using a CR2032 battery case. The assembly sequence of the aqueous zinc-ion battery was as follows: negative electrode case, spring clip, gasket, aqueous zinc-ion battery negative electrode material with amino group coating, GF / D standard glass fiber separator (18 mm diameter), 80 μL of electrolyte (2 M ZnSO4 solution) added using a pipette, copper foil, gasket, and positive electrode case. The battery was then sealed using a battery sealing machine at a sealing pressure of 50 kg / cm². -2This yields an NH2-SiO2@Zn / / Cu zinc-copper half-cell.

[0054] The aqueous zinc-ion battery anode material without amino group coating prepared in Comparative Example 1 was used as the anode of a button cell, and a 14 mm diameter copper foil was used as the cathode. A SiO2@Zn / / Cu zinc-copper half-cell was assembled in air, using a CR2032 battery case. The assembly sequence of the aqueous zinc-ion battery was as follows: anode case, spring clip, gasket, aqueous zinc-ion battery anode material without amino group coating, GF / D standard glass fiber separator (18 mm diameter), 80 μL of electrolyte (2 M ZnSO4 solution) added using a pipette, copper foil, gasket, and cathode case. The battery was then sealed using a battery sealing machine at a sealing pressure of 50 kg cm⁻¹. -2 This yields a SiO2@Zn / / Cu zinc-copper half-cell.

[0055] The bare zinc electrode zinc-copper half-cell is assembled in the same way as above. The negative electrode is a zinc negative electrode with a diameter of 14mm, which is denoted as Bare Zn / / Cu zinc-copper half-cell.

[0056] Application Example 3: Assembling a zinc-iodine full cell

[0057] The aqueous zinc-ion battery anode material with an amino group coating prepared in Example 1 was used as the anode of a button cell, and the KJ / I2 electrode sheet was used as the positive electrode. An NH2-SiO2@Zn / / KJ / I2@Ti zinc-iodine full cell was assembled in air, using a CR2032 battery case. The assembly sequence of the aqueous zinc-ion battery was as follows: anode case, spring sheet, gasket, aqueous zinc-ion battery anode material with an amino group coating, GF / D standard glass fiber separator (18 mm diameter), addition of 80 μL of electrolyte (2 M ZnSO4 solution) using a pipette, KJ / I2 electrode sheet, gasket, and positive electrode case. The battery was then sealed using a battery sealing machine at a sealing pressure of 50 kg / cm². -2 This yields an NH2-SiO2@Zn / / KJ / I2@Ti zinc-iodine full cell.

[0058] The aqueous zinc-ion battery anode material without amino group coating prepared in Example 1 was used as the anode of a button cell, and the KJ / I2 electrode sheet was used as the positive electrode. A SiO2@Zn / / KJ / I2@Ti zinc-iodine full cell was assembled in air, using a CR2032 battery case. The assembly sequence of the aqueous zinc-ion battery was as follows: anode case, spring sheet, gasket, aqueous zinc-ion battery anode material without amino group coating, GF / D standard glass fiber separator (18 mm diameter), addition of 80 μL of electrolyte (2 M ZnSO4 solution) using a pipette, KJ / I2 electrode sheet, gasket, and positive electrode case. The battery was then sealed using a battery sealing machine at a sealing pressure of 50 kg cm⁻¹. -2 This yields a SiO2@Zn / / KJ / I2@Ti zinc-iodine full cell.

[0059] The bare zinc electrode zinc-iodine full cell is assembled in the same way as above. The negative electrode is a zinc negative electrode with a diameter of 14mm, denoted as Bare Zn / / KJ / I2@Ti zinc-iodine full cell.

[0060] Figure 1 The image shows a SEM image of an aqueous zinc-ion battery anode material with an amino group coating prepared in Example 1 of this invention. It can be seen that a uniform layer of aminated silica spheres is attached to the surface of the zinc sheet, and the particle size of the aminated silica spheres is between 400-600 nm.

[0061] Figure 2 The X-ray diffraction (XRD) patterns of aminated silica in Example 1 and silica in Comparative Example 1 are shown. It can be seen that the XRD patterns of aminated silica and silica are similar, both having a low and broad peak at 23.6°, which is because both aminated silica and silica are amorphous structures.

[0062] Figure 3 The Fourier transform infrared (FTIR) spectra of aminated silica in Example 1 and silica in Comparative Example 1 of this invention show the typical absorption peak of silica at 1095 cm⁻¹. -1 and 806cm -1 These represent the asymmetric and symmetric tensile vibration peaks of Si-O-Si, respectively. Both peaks appear in both silica and aminated silica, with the aminated silica peaking more prominently at 1467 cm⁻¹ compared to silica. -1 The appearance of a new NH stretching vibration peak indicates the successful introduction of amino groups into silicon dioxide, resulting in aminated silicon dioxide.

[0063] Figure 4This is a comparison chart of the long-cycle stability tests of the aqueous zinc-ion battery anode material (NH2-SiO2@Zn) with amino group coating prepared in Example 1 of this invention, the aqueous zinc-ion battery anode material (SiO2@Zn) without amino group coating prepared in Comparative Example 1, and the zinc anode sheets assembled from them, forming NH2-SiO2@Zn / / NH2-SiO2@Zn, SiO2@Zn / / SiO2@Zn, and Bare Zn / / Bare Zn symmetric batteries, respectively. It can be seen that at a current density of 1 mA cm⁻¹... -2 Surface capacity is 1mAh cm -2 Under the test conditions, Bare Zn / / Bare Zn and SiO2@Zn / / SiO2@Zn symmetric cells experienced short circuits after 50 hours of cycling due to dendrite growth; while NH2-SiO2@Zn / / NH2-SiO2@Zn symmetric cells could remain stable for over 600 hours and maintain a relatively small polarization voltage of approximately 68mV.

[0064] Figure 5 This is a performance comparison chart of the aqueous zinc-ion battery anode material (NH2-SiO2@Zn) with amino group coating prepared in Example 1 of this invention, the aqueous zinc-ion battery anode material (SiO2@Zn) without amino group coating prepared in Comparative Example 1, and the zinc anode sheets assembled with NH2-SiO2@Zn / / Cu, SiO2@Zn / / Cu, and Bare Zn / / Cu zinc-copper half-cells, respectively. It can be seen that at 2 mA / cm²... -2 The dough mixing capacity is 0.5mAh cm. -2 Under the test conditions, the NH2-SiO2@Zn / / Cu zinc-copper half-cell exhibited an average coulombic efficiency of 99.48% after 400 cycles, which is higher than the cycle life and average coulombic efficiency of the SiO2@Zn / / Cu and Bare Zn / / Cu zinc-copper half-cells.

[0065] Figure 6 The graph shows a performance comparison of the aqueous zinc-ion battery anode material (NH2-SiO2@Zn) with amino group coating prepared in Example 1 of this invention, the aqueous zinc-ion battery anode material (SiO2@Zn) without amino group coating prepared in Comparative Example 1, and the zinc anode sheets assembled from them, specifically NH2-SiO2@Zn / / KJ / I2@Ti, SiO2@Zn / / KJ / I2@Ti, and Bare Zn / / KJ / I2@Ti zinc-iodine full cells. It can be seen that at 0.1 Ag... -1Under the test conditions, after 200 cycles, the NH2-SiO2@Zn / / KJ / I2@Ti zinc-iodine full cell still maintains a high discharge specific capacity, and the remaining capacity is still higher than that of the SiO2@Zn / / KJ / I2@Ti and BareZn / / KJ / I2@Ti zinc-iodine full cells, and the coulombic efficiency remains more stable.

[0066] The foregoing embodiments of this invention are merely illustrative examples provided to explain the invention and are not intended to limit the scope of implementation. Those skilled in the art can make various modifications and adjustments based on the foregoing description. Given the derivability and diversity of technical solutions, it is impossible to exhaustively list all possible implementations. All obvious modifications or adjustments derived from the core concept of this invention are still within the protection scope of this invention.

Claims

1. A water-based zinc-ion battery anode material with an amino group coating, characterized in that, The aqueous zinc-ion battery anode material with an amino group coating is obtained by coating an aminated silica coating slurry onto a zinc anode and then drying it; the aminated silica coating slurry includes aminated silica, a binder, and an organic solvent.

2. The aqueous zinc-ion battery negative electrode material with an amino group coating according to claim 1, characterized in that, The thickness of the aminated silica coating is 10-20 μm.

3. The aqueous zinc-ion battery negative electrode material with an amino group coating according to claim 1, characterized in that, The mass ratio of aminated silica to binder in the aminated silica coating is 8:

2.

4. The aqueous zinc-ion battery negative electrode material with an amino group coating according to claim 1, characterized in that, The adhesive includes polyvinylidene fluoride and polytetrafluoroethylene.

5. The aqueous zinc-ion battery negative electrode material with an amino group coating according to claim 1, characterized in that, The thickness of the zinc anode is 50-100 μm.

6. A method for preparing an aqueous zinc-ion battery negative electrode material with an amino group coating as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Add aminated silica and binder to an agate mortar and grind to obtain a mixed powder of aminated silica and binder. S2. Transfer the mixed powder of aminated silica and binder from step S1 to a stirring container, then add an organic solvent and stir to mix, to obtain an aminated silica coating slurry, which is then coated onto the zinc anode and dried to obtain the aqueous zinc-ion battery anode material with an amino group coating.

7. The preparation method according to claim 6, characterized in that, The grinding time in step S1 is 10-30 min.

8. The preparation method according to claim 6, characterized in that, The stirring speed mentioned in step S2 is 300-600 rpm. -1 The stirring time is 6-8 hours, and the temperature is 20-30℃.

9. The preparation method according to claim 6, characterized in that, In step S2, the drying temperature is 50-80℃ and the drying time is 8-12 hours.

10. The application of an aqueous zinc-ion battery negative electrode material with an amino group coating as described in any one of claims 1-6 in an aqueous zinc-ion battery.

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