Zinc-philic copper wire mesh intermediate layer for zinc battery and preparation method and application of zinc-philic copper wire mesh intermediate layer

Abstract

The invention discloses a zinc-philic copper mesh interlayer for a zinc battery as well as a preparation method and application of the zinc-philic copper mesh interlayer, and belongs to the field of biological materials and electrochemistry. The zinc-philic copper mesh middle layer for the zinc battery comprises a copper mesh and a bacterial cellulose layer deposited on the copper mesh, and bacterial cellulose is deposited on the copper mesh through a gel electrophoresis method. The bacterial cellulose with an appropriate three-dimensional cross-linked network structure is constructed on the copper net through a gel electrophoresis method, an obvious buffer layer is provided for the zinc negative electrode, a traditional point-to-point contact mode is changed into large-area contact, a stable ion / electron three-dimensional transmission channel is formed, and the zinc negative electrode is prepared. And the transmission efficiency of Zn < 2 + > and the structural stability of the zinc negative electrode can be improved. And meanwhile, the zinc-philic copper net intermediate layer with the porous three-dimensional structure is used as a carrier for zinc deposition, so that the deposition and dissolution of zinc can be promoted, the reversibility of the zinc negative electrode can be improved, and the cycling stability, the rate capability and the coulombic efficiency of the zinc metal negative electrode can be further improved.

Description

Technical Field

[0001] The present invention relates to the fields of biomaterials and electrochemistry technologies, and particularly relates to a zincophilic copper mesh intermediate layer for a zinc battery, a preparation method thereof, and an application thereof. Background Art

[0002] With the rapid development of economy and technology, the shortage problems of traditional energy sources such as petroleum and natural gas have become increasingly prominent, and environmental pollution has also become more and more serious. Therefore, developing clean energy represented by energy storage batteries has become an important goal at present. Although lithium-ion batteries have excellent energy storage performance and are one of the effective ways to solve the energy crisis and environmental problems, the development of lithium-ion batteries is restricted due to safety problems of organic electrolytes such as flammability and poor thermal stability. Using an aqueous electrolyte to replace the organic electrolyte can effectively improve the safety performance of the battery, reduce the preparation cost, and at the same time, the ionic conductivity of the aqueous electrolyte is two orders of magnitude higher than that of the organic electrolyte, which can enable the battery to have a higher power density. Current aqueous batteries mainly include aqueous lithium-ion batteries, aqueous sodium-ion batteries, aqueous zinc-ion batteries, etc. Relatively speaking, zinc metal has low cost, non-toxicity, and a low redox potential, is more suitable for aqueous electrolytes, and has greater research potential as the anode of zinc-ion batteries. Moreover, due to the high density of zinc and the two-electron reaction involved in the electrochemical reaction, zinc-ion batteries are promoted to have a higher volume energy density and have great application prospects, and are considered as the preferred direction for the next generation of new power batteries and energy storage batteries.

[0003] Currently, the bottlenecks hindering the further development of zinc metal batteries mainly include poor interfacial contact, which easily generates zinc dendrites. The generated rigid zinc dendrites are prone to piercing the separator, resulting in internal short circuits in the battery. Moreover, zinc dendrites increase the specific surface area of the negative electrode, accelerating the corrosion and hydrogen evolution rates, leading to lower Coulombic efficiency and excessive interfacial activity between the electrode and the electrolyte. Some harmful side reactions will occur during the storage or operation of the battery, consuming the charge and discharge capacity, thereby reducing the reversibility of the electrode. In response to the above problems, a large number of scientists have conducted in-depth research and proposed strategies to guide the zinc ion deposition behavior to inhibit dendrites and corrosion by using protective coatings, modified separators, electrolyte additives, etc. Although these strategies can partially inhibit dendrite growth, they all have deficiencies. For example, the bonding force between the protective coating and the electrode is poor, and the coating is prone to deformation; the modified separator is easily broken; the electrolyte additive is expensive. At the same time, the timeliness of these strategies is low, and dendrites will inevitably be generated when the battery is cycled at a high current density for a long time. For interfacial problems, methods such as constructing a buffer layer are mainly used to alleviate poor interfacial contact and reduce interfacial impedance. In recent years, a large number of studies on the modified electrode / solid electrolyte interface of coatings have been reported, showing excellent interfacial modification effects, but the point-to-point contact between the internal positive electrode particles still needs to be solved. The solid electrolyte cannot completely penetrate the gaps between the particles, and the coating thickness of the solid electrolyte will also affect the electron transport in the system.

[0004] Based on this, it is of great significance to develop a zincophilic copper mesh intermediate layer that can not only guide the uniform deposition of zinc ions but also improve the zinc ion transport efficiency. Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, one of the purposes of the present invention is to provide a zincophilic copper mesh intermediate layer for zinc batteries. This intermediate layer can not only induce the 2+ uniform deposition of Zn, but also promote the deposition and dissolution of zinc, improve the 2+ transport efficiency of Zn and the structural stability of the zinc negative electrode, thereby enhancing the cycle stability and rate performance of zinc batteries.

[0006] The purpose of the present invention is achieved through the following technical solutions.

[0007] A zincophilic copper mesh intermediate layer for zinc batteries includes a copper mesh and a bacterial cellulose layer deposited on the copper mesh. The bacterial cellulose is deposited on the copper mesh by gel electrophoresis.

[0008] In the present invention, bacterial cellulose is deposited on the copper mesh by gel electrophoresis to construct a bacterial cellulose thin film with a three-dimensional cross-linked network structure on the copper mesh, obtaining a zincophilic copper mesh intermediate layer, and then applying it to a zinc battery as a carrier for zinc deposition to induce Zn 2+Deposit uniformly on the middle layer of the copper mesh, effectively inhibiting the growth of zinc dendrites; at the same time, this zincophilic copper mesh middle layer can provide an obvious buffer layer for the zinc negative electrode, changing the traditional point-to-point contact method into large-area contact, forming a stable three-dimensional ion / electron transmission channel, which helps to improve Zn 2+ transport efficiency and structural stability. In addition, the zincophilic copper mesh middle layer with a three-dimensional porous structure can promote the deposition and dissolution of zinc, help to improve the reversibility of the battery, provide good electrolyte permeability at the same time, slow down the deterioration rate of the electrode, thus significantly improving the stability and reversibility of the battery, improving the cycle stability of the zinc metal negative electrode and the rate performance of the battery, and improving the efficiency and life of the battery.

[0009] The zincophilic copper mesh middle layer obtained by the gel electrophoresis technology in the present invention has the following two characteristics: ① It has stable structural strength and toughness. The one-dimensional bacterial cellulose is deposited on the copper mesh by gel electrophoresis to construct an ordered three-dimensional cross-linked network structure. The one-dimensional bacterial cellulose provides continuous linear channels on the nanoscale, and the overall three-dimensional network structure formed by the interconnection of the one-dimensional bacterial cellulose is used for the continuous transmission of Zn 2+ in the electrolyte. After the electrolyte solution successfully infiltrates into the three-dimensional network of the bacterial cellulose film, the traditional point-to-point contact method is changed into large-area contact, forming a stable three-dimensional ion / electron transmission channel, which helps to improve Zn 2+ transport efficiency and the structural stability of the zinc negative electrode. ② By introducing negatively charged groups such as -COOH and -OH on the copper mesh through bacterial cellulose, it is easy to adsorb Zn 2+ , making the local charge distribution uniform, inducing the uniform deposition of Zn 2+ , effectively inhibiting the growth of zinc dendrites and slowing down the deterioration rate of the electrode. 2+

[0010] In the present invention, the thickness of the bacterial cellulose layer can be 0.01 - 0.10 mm, preferably 0.05 mm.

[0011] In the present invention, the preparation method of the zincophilic copper mesh middle layer for zinc batteries includes the following steps:

[0012] S1. Prepare a mixed hydrogel of bacterial cellulose and magnesium nitrate;

[0013] S2. Deposit the mixed hydrogel on the copper mesh by gel electrophoresis, perform a drying treatment, wash it and then dry it again to obtain the zincophilic copper mesh middle layer for zinc batteries.

[0014] Preferably, in step S1, the mass ratio of bacterial cellulose to magnesium nitrate in the mixed hydrogel is 10:(1 - 2).

[0015] ​Preferably, in step S2, in the gel electrophoresis method, a double-electrode system is composed of a copper mesh and a platinum sheet, the voltage is 3-20 V, and the time is 60-150 s.

[0016] Preferably, the temperature of the drying treatment is 60-80 °C, and the time is 12-24 h.

[0017] Preferably, the specific operation of washing is as follows: The copper mesh is placed in absolute ethanol and ultrasonically washed 3-5 times.

[0018] Another object of the present invention is to provide the application of the zincophilic copper mesh intermediate layer as a zinc deposition carrier in a zinc battery, and the zincophilic copper mesh intermediate layer is located between the negative electrode and the separator.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] (1) In the present invention, bacterial cellulose with a suitable three-dimensional cross-linked network structure is constructed on the copper mesh by gel electrophoresis, providing an obvious buffer layer for the zinc negative electrode, changing the traditional point-to-point contact method into large-area contact, and forming a stable three-dimensional ion / electron transmission channel, which helps to improve the 2+ transport efficiency of Zn and the structural stability of the zinc negative electrode. At the same time, the zincophilic copper mesh intermediate layer with a porous three-dimensional structure as a zinc deposition carrier can promote the deposition and dissolution of zinc, help to improve the reversibility of the zinc negative electrode, and further improve the cycle stability, rate performance and Coulomb efficiency of the zinc metal negative electrode.

[0021] (2) The NH4VO3||Zn full battery with the copper mesh intermediate layer of the present invention as the zinc deposition carrier still maintains a specific capacity of 90 mAh / g after 2500 stable cycles under the current density condition of 5 A / g, the capacity retention rate is 78.26%, and the Coulomb efficiency can reach 98.4%, with good capacity retention rate and Coulomb efficiency. The Zn||Zn symmetric battery with the copper mesh intermediate layer of the present invention as the zinc deposition carrier has a current density of 5 mA cm -2 , the charge and discharge time is 12 min each, and the specific capacity is 1 mAh cm -2 , and there is a stable cycle of more than 550 h, with good cycle stability. Description of the Drawings

[0022] Figure 1 is the process flow chart of the preparation of the zincophilic copper mesh intermediate layer for the zinc battery of the present invention;

[0023] Figure 2 is the schematic diagram of the button battery assembly of the Zn||Zn symmetric battery and the NH4VO3||Zn full battery;

[0024] Figure 3SEM images of the pure copper mesh and the zincophilic copper mesh intermediate layer of Example 2;

[0025] Figure 4 Long cycle diagrams of Zn||Zn symmetric cells with a zinc-free deposition carrier, a pure copper mesh as the zinc deposition carrier, and the zincophilic copper mesh intermediate layer of Example 2 as the zinc deposition carrier;

[0026] Figure 5 Cycling performance diagram of the NH4VO3||Zn full cell with the zincophilic copper mesh intermediate layer of Example 2 as the zinc deposition carrier;

[0027] Figure 6 CV diagram of the NH4VO3||Zn full cell with the zincophilic copper mesh intermediate layer of Example 2 as the zinc deposition carrier. Detailed implementation manners

[0028] Next, the applicant will further elaborate on the method of the present invention in combination with specific examples, aiming to enable those skilled in the art to clearly understand the present invention. However, the following examples should not be construed as limiting the scope of protection requested by the claims of the present invention in any way.

[0029] Example 1

[0030] As Figure 1 shown, the preparation method of the zincophilic copper mesh intermediate layer for zinc batteries in this example includes the following steps:

[0031] S1. Add the bacterial cellulose dispersion to the electrophoresis tank, dilute it 10 times with deionized water, set the mass fraction ratio of bacterial cellulose to 10%, stir for 30 min to obtain a homogeneous suspension, and then add Mg(NO3)2 to the suspension and stir for 2 h to obtain a highly homogeneous and translucent mixed hydrogel. The mass fraction of Mg(NO3)2 in the mixed hydrogel is 2%;

[0032] S2. Fix the copper mesh, form a two-electrode system with the platinum sheet electrode, place it in the mixed hydrogel of step S1, apply a voltage of 3 V to the working electrode, and perform electrophoresis for 150 s to obtain the bacterial cellulose-modified copper mesh;

[0033] S3. Spread the bacterial cellulose-modified copper mesh in a petri dish, make it closely adhere to the petri dish, quickly transfer it to an electrothermal blast drying oven for atmospheric drying after standing for 1 min. The drying temperature is 80 °C and the drying time is 15 h; then place it in 99% absolute ethanol and ultrasonically wash it 3 - 5 times, 1 min each time, and finally dry it in an oven at 60 °C to obtain the zincophilic copper mesh intermediate layer for zinc batteries (denoted as BC copper mesh). The thickness of the bacterial cellulose layer is 0.05 mm.

[0034] Example 2

[0035] The preparation method of the zincophilic copper mesh intermediate layer for zinc batteries in this embodiment includes the following steps:

[0036] S1. Add the bacterial cellulose dispersion liquid into the electrophoresis tank, dilute it 10 times with deionized water, make the mass fraction ratio of bacterial cellulose be 10%, stir for 30 min to obtain a uniform suspension liquid, then add Mg(NO3)2 into the suspension liquid, stir for 2 h to obtain a highly uniform and semi-transparent mixed hydrogel, and the mass fraction of Mg(NO3)2 in the mixed hydrogel is 2%;

[0037] S2. Fix the copper mesh, form a two-electrode system with the platinum sheet electrode, put it into the mixed hydrogel in step S1, apply a voltage of 5 V to the working electrode, and perform electrophoresis for 120 s to obtain the bacterial cellulose-modified copper mesh;

[0038] S3. Lay the bacterial cellulose-modified copper mesh flat in a petri dish, make it closely adhere to the petri dish, let it stand for 1 min and then quickly transfer it to an electrothermal blast drying oven for drying under normal pressure, the drying temperature is 80 °C, and the drying time is 15 h; then place it in 99% absolute ethanol and ultrasonically wash it 3 - 5 times, 1 min each time, and finally place it in an oven at 60 °C for drying to obtain the zincophilic copper mesh intermediate layer for zinc batteries (denoted as BC copper mesh), and the thickness of the bacterial cellulose layer is 0.05 mm.

[0039] Figure 3 Figures are SEM images of pure copper mesh and BC copper mesh. It can be seen from the figures that the bacterial cellulose is uniformly deposited on the copper mesh, and the one-dimensional bacterial cellulose is deposited along the three-dimensional cross-linked network of the copper mesh and is interconnected to form an overall three-dimensional network structure.

[0040] Example 3

[0041] The preparation method of the zincophilic copper mesh intermediate layer for zinc batteries in this embodiment includes the following steps:

[0042] S1. Add the bacterial cellulose dispersion liquid into the electrophoresis tank, dilute it 10 times with deionized water, make the mass fraction ratio of bacterial cellulose be 10%, stir for 30 min to obtain a uniform suspension liquid, then add Mg(NO3)2 into the suspension liquid, stir for 2 h to obtain a highly uniform and semi-transparent mixed hydrogel, and the mass fraction of Mg(NO3)2 in the mixed hydrogel is 1%;

[0043] S2. Fix the copper mesh, form a two-electrode system with the platinum sheet electrode, put it into the mixed hydrogel in step S1, apply a voltage of 10 V to the working electrode, and perform electrophoresis for 90 s to obtain the bacterial cellulose-modified copper mesh;

[0044] S3. Lay the bacterial cellulose-modified copper mesh flat in a petri dish, making it adhere tightly to the petri dish. After standing for 1 min, quickly transfer it to an electrothermal blast drying oven for atmospheric drying. The drying temperature is 70 °C and the drying time is 20 h. Then place it in 99% absolute ethanol and ultrasonically wash it 3 - 5 times, 1 min each time. Finally, place it in an oven at 60 °C to dry, and the zincophilic copper mesh intermediate layer for zinc batteries (denoted as BC copper mesh) is obtained. The thickness of the bacterial cellulose layer is 0.05 mm.

[0045] Example 4

[0046] The preparation method of the zincophilic copper mesh intermediate layer for zinc batteries in this example includes the following steps:

[0047] S1. Add the bacterial cellulose dispersion into an electrophoresis tank, dilute it 10 times with deionized water, and make the mass fraction ratio of bacterial cellulose 10%. Stir for 30 min to obtain a homogeneous suspension. Then add Mg(NO3)2 to the suspension and stir for 2 h to obtain a highly homogeneous and translucent mixed hydrogel. The mass fraction of Mg(NO3)2 in the mixed hydrogel is 2%.

[0048] S2. Fix the copper mesh and form a two-electrode system with a platinum sheet electrode. Put it into the mixed hydrogel in step S1, apply a voltage of 20 V to the working electrode, and perform electrophoresis for 60 s to obtain the bacterial cellulose-modified copper mesh.

[0049] S3. Lay the bacterial cellulose-modified copper mesh flat in a petri dish, making it adhere tightly to the petri dish. After standing for 1 min, quickly transfer it to an electrothermal blast drying oven for atmospheric drying. The drying temperature is 60 °C and the drying time is 24 h. Then place it in 99% absolute ethanol and ultrasonically wash it 3 - 5 times, 1 min each time. Finally, place it in an oven at 60 °C to dry, and the zincophilic copper mesh intermediate layer for zinc batteries is obtained. The thickness of the bacterial cellulose layer is 0.05 mm.

[0050] Application Example

[0051] Using the zincophilic copper mesh intermediate layers of Examples 1 - 4 as zinc deposition carriers, button cells of Zn||Zn symmetric batteries and NH4VO3||Zn full batteries are respectively prepared, and their electrochemical performance is tested.

[0052] Among them, the assembly flow chart of the Zn||Zn symmetric battery is as shown in Figure 2 the left figure. Using a glass fiber as the separator and a 2M ZnSO4 aqueous solution as the electrolyte, stack the negative electrode shell, zinc sheet, zincophilic copper mesh intermediate layer (BC copper mesh), separator, zincophilic copper mesh intermediate layer (BC copper mesh), zinc sheet, gasket, spring piece, and positive electrode shell in sequence as shown in Figure 2 the left figure to assemble a button cell.

[0053] The assembly flow chart of the NH4VO3||Zn full cell is as follows Figure 2 shown in the right figure. The preparation method of the positive electrode sheet is as follows: Mix (NH4)2V 10 O 25 ·8H2O nanosheets, PVDF, and Super P in a mass ratio of 7:2:1, add NMP solvent and stir evenly, coat it on carbon paper, place it in a vacuum oven and dry at 80 °C for 24 h, cut it into circular membranes with a diameter of 12 mm after cooling to obtain the positive electrode sheet; then use a zinc sheet as the negative electrode, a glass fiber as the separator, and 2M zinc trifluoromethanesulfonate as the electrolyte, and assemble it into an NH4VO3||Zn button cell in the order Figure 2 shown in the right figure.

[0054] Use a battery test system to test the electrochemical performance of the assembled battery.

[0055] Figure 4 are the long-cycle diagrams of Zn||Zn symmetric cells with no zinc deposition carrier, pure copper mesh as the zinc deposition carrier, and the zincophilic copper mesh intermediate layer of Example 2 as the zinc deposition carrier. It can be seen from the figure that the Zn||Zn symmetric cell with the zincophilic copper mesh intermediate layer as the zinc deposition carrier has a stable cycle of more than 550 h at a current density of 5 mA cm -2 and a specific capacity of 1 mAh cm -2 . The combination of copper mesh and BC insulating network makes the charge distribution more uniform, and the growth of one-dimensional bacterial cellulose along the three-dimensional cross-linked network of copper mesh can provide an ordered nano-polymer chain migration channel for Zn 2+ , ensuring the rapid transmission of Zn 2+ . The modification of the BC network can adsorb Zn 2+ onto the copper mesh intermediate layer, and optimize the concentration distribution of Zn 2+ in the aqueous electrolyte, induce the uniform deposition of Zn, reduce the interfacial impedance of the zinc negative electrode, reduce the corrosion reaction of zinc, and thus slow down the deterioration rate of the electrode. The combination of copper mesh and BC insulating network can effectively reduce the zinc nucleation resistance and local current density, thereby minimizing the zinc nucleation overpotential, obtaining a small initial zinc crystal nucleus size, and inhibiting the formation of zinc dendrites. And the introduction of the combination of copper mesh and BC insulating network can effectively modify the Zn 2+ active center, optimize the interaction between the active center and Zn 2+ , reduce the diffusion energy barrier, and ensure the Zn 2+Deposition and dissolution. Therefore, compared with the zinc-free deposition carrier and the pure copper mesh as the zinc deposition carrier, the combination of copper mesh and BC network as the zinc deposition carrier has unique advantages. It can also be seen from the local circulation diagram that compared with the bare zinc Zn||Zn symmetric battery without a zinc deposition carrier and the Zn||Zn symmetric battery with a pure copper mesh as the zinc deposition carrier, the Zn||Zn symmetric battery with the zincophilic copper mesh interlayer of Example 2 as the zinc deposition carrier has a more stable and smaller voltage polarization, and always maintains a stable overpotential of 42 mV, showing stable long-cycle performance. This indicates that the zincophilic copper mesh interlayer can promote the 2+ uniform deposition of Zn, inhibit the growth of zinc dendrites, and significantly improve the cycle stability.

[0056] Figure 5 Figure 6 shows the cycle performance of the NH4VO3||Zn full battery with the zincophilic copper mesh interlayer of Example 2 as the zinc deposition carrier. It can be seen from the figure that the NH4VO3||Zn full battery with the zincophilic copper mesh interlayer as the zinc deposition carrier still maintains a specific capacity of 90 mAh / g after 2500 stable cycles under a current density of 5 A / g, with a capacity retention rate of 78.26% and a Coulomb efficiency of up to 98.4%, showing good capacity retention and Coulomb efficiency. It can also be seen from the voltage-capacity curve that during the initial cycling process, as the activation inside the battery and the activation of the active material insertion process occur, the capacity increases, and its specific capacity when the battery is full at 2000 cycles can still reach 98 mAh / g, showing excellent long-cycle performance and long-cycle capacity.

[0057] Figure 6 Figure 7 shows the CV diagram of the NH4VO3||Zn full battery with the zincophilic copper mesh interlayer of Example 2 as the zinc deposition carrier. It can be seen from the figure that the two oxidation peak potentials are approximately 0.6 V and 1.0 V, corresponding to the two - oxidation processes of VO3 - . The two reduction peak potentials are approximately 0.6 V and 1.0 V, and the peak spacing is roughly the same. Also, the ratio of the two oxidation peak currents to the reduction peak currents is close to 1, indicating that the reaction has good reversibility. At this time, the oxide of VO3 - is reduced back to VO3

[0058] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A zincophilic copper mesh intermediate layer for a zinc battery, characterized in that, It includes a copper mesh and a bacterial cellulose layer deposited on the copper mesh, and the bacterial cellulose is deposited on the copper mesh by gel electrophoresis.

2. The zincophilic copper mesh intermediate layer for a zinc battery according to claim 1, characterized in that, The thickness of the bacterial cellulose layer is 0.01 - 0.10 mm.

3. The zincophilic copper mesh intermediate layer for a zinc battery according to claim 1, characterized in that, The thickness of the bacterial cellulose layer is 0.05 mm.

4. The preparation method of the zincophilic copper mesh intermediate layer for zinc batteries according to any one of claims 1 to 3, characterized in that, It includes the following steps: S1. Prepare a mixed hydrogel of bacterial cellulose and magnesium nitrate. S2. Deposit the mixed hydrogel on the copper mesh by gel electrophoresis, conduct a drying treatment, wash it and then dry it again to obtain the zincophilic copper mesh intermediate layer for the zinc battery.

5. The preparation method of the zincophilic copper mesh intermediate layer for zinc batteries according to claim 4, wherein In step S1, the mass ratio of bacterial cellulose to magnesium nitrate in the mixed hydrogel is 10:(1 - 2).

6. The preparation method of the zincophilic copper mesh intermediate layer for zinc batteries according to claim 4, characterized in that, In step S2, in the gel electrophoresis, a two-electrode system composed of a copper mesh and a platinum sheet is used, the voltage is 3 - 20 V, and the time is 60 - 150 s.

7. The preparation method of the zincophilic copper mesh intermediate layer for zinc batteries according to claim 4, characterized in that, The temperature of the drying treatment is 60 - 80 °C, and the time is 12 - 24 h.

8. The preparation method of the zincophilic copper mesh intermediate layer for zinc batteries according to claim 4, characterized in that, The specific operation of washing is as follows: Place the copper mesh in absolute ethanol and ultrasonically wash it 3 - 5 times.

9. Use of the zincophilic copper mesh intermediate layer prepared by the preparation method according to claim 4 or the zincophilic copper mesh intermediate layer according to claim 1 in a zinc battery, characterized in that, The zincophilic copper mesh intermediate layer is located between the negative electrode and the separator.

Images