Boron nitride nano-localized gel electrolyte and zinc-ion battery and preparation method

Abstract

This invention discloses a boron nitride nano-localized gel electrolyte, a zinc-ion battery, and a preparation method thereof. It belongs to the technical field of zinc-ion batteries. The preparation method includes: adding monomers, zinc salts, initiators, crosslinking agents, and catalysts to an aqueous dispersion of hydroxylated boron nitride nanosheets at a mass concentration of 0.1-0.3 mg / mL, adjusting the pH to 4.0-5.0 to obtain a gel prepolymer solution, and then heating and polymerizing the prepolymer solution at 35-45°C to obtain the boron nitride nano-localized gel electrolyte. This preparation method can successfully introduce a specific proportion of hydroxylated boron nitride sheets into a zinc salt-containing gel, forming localized hydrophobic regions within the gel, reducing the contact between the zinc electrode and water molecules, avoiding side reactions, and inhibiting the growth of zinc dendrites.

Description

Technical Field

[0001] This invention relates to the technical field of zinc-ion batteries, and particularly to zinc-ion batteries with gel electrolytes containing boron nitride nanomaterials. Background Technology

[0002] Zinc-ion batteries have advantages such as high volumetric energy density, low redox potential, high abundance, and environmental friendliness, making them a promising emerging battery product.

[0003] Existing zinc-ion batteries typically use aqueous electrolytes, which are prone to various water-induced side reactions, such as hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). There is also zinc dendrite formation caused by uneven deposition and / or stripping of zinc ions on the negative electrode, resulting in a rough and uneven electrode surface. The growth of zinc dendrites further increases the surface area of ​​the zinc negative electrode, promotes the occurrence of side reactions, and seriously affects the cycle life of the battery.

[0004] To address these issues, some existing technologies have constructed artificial interface layers on the zinc anode surface, such as inorganic nano-calcium carbonate coatings, organic polyimide coatings, and artificial polyacrylonitrile coatings. However, the thickness of these interface layers is difficult to control, the preparation process is cumbersome, and the cost is high, making them unsuitable for large-scale mass production. Other existing technologies have employed electrolyte composition optimization, such as additive control, solvation, or water-in-salt improvements. However, the addition of additives and / or salts not only increases the cost of the electrolyte but also leads to increased electrolyte viscosity, resulting in a significant decrease in ionic conductivity. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to propose a boron nitride nanogel electrolyte, a zinc-ion battery, and a preparation method. This electrolyte successfully introduces hydroxylated boron nitride sheets into a zinc salt-containing gel. While maintaining high ionic conductivity, it can form localized hydrophobic regions inside the gel, reducing the contact between the zinc electrode and water molecules, avoiding side reactions, and inhibiting the growth of zinc dendrites.

[0006] The technical solution of the present invention is as follows:

[0007] A method for preparing boron nitride nano-localized gel electrolyte includes the following steps:

[0008] (1) Hydroxylated boron nitride nanosheets were mixed with water and ultrasonically dispersed to obtain a boron nitride dispersion with a mass concentration of 0.1-0.3 mg / mL.

[0009] (2) Add monomer, zinc salt, initiator, crosslinking agent and catalyst to the boron nitride dispersion to obtain a mixture, adjust the pH of the mixture to 4.0-5.0 to obtain a gel prepolymer solution;

[0010] (3) The gel prepolymer solution is heated and polymerized at 35-45℃ to obtain the boron nitride nano-localized gel electrolyte;

[0011] The monomer is selected from one or more of acrylamide, acrylic acid, methacrylic acid, acryloyloxyethyltrimethylammonium chloride, and 2-acrylamido-2-methylpropanesulfonic acid, and the concentration of the zinc salt is 0.5-2 mol / L.

[0012] The electrolyte obtained by this invention is in a gel state, in which hydroxylated boron nitride nanosheets with uniform dispersion, excellent mechanical properties and insulation, and a specific dispersion concentration are successfully introduced. This not only improves the mechanical properties of the gel electrolyte and enhances its insulation, preventing battery short circuits caused by electron conduction, but also achieves stable dispersion of hydroxylated boron nitride nanosheets in polymer aqueous solutions and forms nano-regions of local hydrophobicity within the gel through the local hydrophilicity of the hydroxyl groups at the edges and the local hydrophobicity of the internal planes. This reduces the contact between the zinc electrode and water molecules, reduces side reactions, inhibits the growth of zinc dendrites, and enhances the uniformity of the material.

[0013] According to some preferred embodiments of the present invention, the zinc salt is selected from one or more of zinc sulfate, zinc chloride, zinc acetate, zinc nitrate, and zinc perchlorate.

[0014] According to some preferred embodiments of the present invention, the initiator is ammonium persulfate and / or potassium persulfate, and the crosslinking agent is N,N'-methylenebisacrylamide and / or ethylene glycol diacrylate.

[0015] According to some preferred embodiments of the present invention, the mass of the monomer is 10-20 wt% of the mass of the gel prepolymer.

[0016] The inventors unexpectedly discovered that at this mass ratio, the gel electrolyte had a moderate water content and good polymerization effect.

[0017] According to some preferred embodiments of the present invention, the monomer includes anionic monomer, cationic monomer and propylene monomer, wherein the anionic monomer is 2-acrylamido-2-methylpropanesulfonic acid, the cationic monomer is acryloyloxyethyltrimethylammonium chloride, and the propylene monomer is one or more of acrylamide, acrylic acid, and methacrylic acid.

[0018] According to the above preferred embodiments, the gel electrolyte obtained by the present invention is a zwitterionic gel electrolyte with boron nitride nanosheets introduced. It can further form dual ion channels through the zwitterionic network, regulate the transport path of zinc ions, restrict the two-dimensional diffusion of zinc ions, enhance the uniform deposition and stripping of zinc ions on the zinc anode surface, further inhibit the growth of zinc dendrites, and extend the battery cycle life.

[0019] According to some preferred embodiments of the present invention, the hydroxylated boron nitride nanosheets are obtained by ball milling micron-sized boron nitride powder with an aqueous sodium hydroxide solution, washing the ball-milled product with water, ultrasonically dispersing and centrifuging it, and then freeze-drying it to obtain the hydroxylated boron nitride powder with a particle size of 150-250 nm.

[0020] According to some preferred embodiments of the present invention, the heating polymerization temperature is 40°C and the time is 6-12 hours.

[0021] According to some preferred embodiments of the present invention, the pH is adjusted by the content of the catalyst, wherein the catalyst is N,N,N',N'-tetramethylethylenediamine.

[0022] The inventors unexpectedly discovered that this preferred catalyst can not only effectively catalyze free radical polymerization reactions, but also simultaneously adjust the pH of the prepolymer system and extend the cycle life of the battery.

[0023] The present invention further provides a boron nitride nanolocalized gel electrolyte prepared according to the above preparation method.

[0024] The electrolyte is a three-dimensional network of a nanocomposite copolymer formed by in-situ polymerization of hydroxylated boron nitride nanosheets and three monomers. The hydroxylated boron nitride nanosheets can not only form local hydrophobic regions in the three-dimensional network, but also the hydrogen bonding with the three-dimensional network can serve as a second layer of physical cross-linking network.

[0025] The present invention further provides a zinc-ion battery containing the above-mentioned boron nitride nano-localized gel electrolyte.

[0026] The present invention has the following beneficial effects:

[0027] (1) In the gel electrolyte of the present invention, the hydroxylated boron nitride nanosheets have excellent mechanical properties and insulation properties, which can improve the safety performance of the gel electrolyte. They form dispersed nano-local hydrophobic regions inside the gel electrolyte, reduce the direct contact between the zinc electrode and water molecules, reduce the occurrence of side reactions, and inhibit the growth of zinc dendrites.

[0028] (2) In some preferred embodiments, the preparation method of the present invention introduces hydroxylated boron nitride nanosheets of a specific concentration into the amphoteric ternary copolymer network structure formed by the copolymerization of three monomers: anionic monomer, cationic monomer, and propylene monomer. The hydroxylated boron nitride nanosheets can form hydrogen bonds with the amide group, carboxyl group, and sulfonic acid group in the polymer network, thereby improving the mechanical properties of the gel electrolyte.

[0029] (3) The electrolyte of the present invention can be prepared by one-step method. The preparation process is simple, the reaction conditions are mild, and the cost is low, the safety is reliable, and it has good application prospects. Attached Figure Description

[0030] Figure 1 The symmetric cell of the gel electrolyte prepared in Example 1 at 1 mA cm⁻¹ -2 Current density and 1mAh cm -2 Cyclic performance at capacity density.

[0031] Figure 2 The symmetric cell of the gel electrolyte prepared in Example 2 was tested at 1 mA cm⁻¹. -2 Current density and 1mAh cm -2 Cyclic performance at capacity density.

[0032] Figure 3 The symmetric cell of the gel electrolyte prepared in Example 3 was tested at 1 mA cm⁻¹. -2 Current density and 1mAh cm -2 Cyclic performance at capacity density.

[0033] Figure 4 The symmetric cell of the gel electrolyte prepared in Example 3 was tested at 5 mA cm⁻¹. -2 Current density and 5mAh cm -2 Cyclic performance at capacity density.

[0034] Figure 5 The Zn-Cu battery with gel electrolyte prepared in Example 3 was tested at 1 mA cm⁻¹. -2 Current density and 1mAh cm -2 Cyclic performance at capacity density.

[0035] Figure 6 A symmetric cell of the gel electrolyte prepared in Comparative Example 1 was constructed at 1 mA cm⁻¹. -2 Current density and 1mAh cm -2 Cyclic performance at capacity density.

[0036] Figure 7 This is a comparison chart of the mechanical properties of the gel electrolytes in Comparative Example 1 and Example 3.

[0037] Figure 8 The liquid symmetric cell prepared in Comparative Example 2 operates at 1 mA cm⁻¹ -2 Current density and 1mAh cm -2 Cyclic performance at capacity density.

[0038] Figure 9 The liquid symmetric cell prepared in Comparative Example 2 was tested at 5 mA cm⁻¹.-2 Current density and 5mAh cm -2 Cyclic performance at capacity density.

[0039] Figure 10 The liquid Zn-Cu battery prepared in Comparative Example 2 was tested at 1 mA cm⁻¹. -2 Current density and 1mAh cm -2 Cyclic performance at capacity density.

[0040] Figure 11 This is a comparison graph of the cyclic voltammetry test curves of Zn-Cu batteries in Comparative Example 2 and Example 3. Detailed Implementation

[0041] The technical solutions of the present invention will be further described below with reference to the embodiments and accompanying drawings. The embodiments described below 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 should fall within the scope of protection of the present invention.

[0042] Example 1

[0043] Hydroxylated boron nitride nanosheets were obtained through the following process: 100 mg of micron-sized boron nitride powder and 2 mol / L sodium hydroxide aqueous solution were placed in a ball mill jar, and zirconium dioxide grinding balls were added at a ball-to-powder ratio of 50:1. The rotation speed was set to 200 rpm, and the mixture was milled for 30 h. After milling, the product was washed with deionized water until the pH value was close to neutral. The product was dispersed in water at a concentration of 0.5 mg / mL and sonicated for 1 h. The sonicated dispersion was then centrifuged at 1000 rpm for 10 min to remove agglomerates and thick sheets. Finally, the dispersion was freeze-dried to obtain hydroxylated boron nitride nanosheets. The microstructure of the hydroxylated boron nitride nanosheets was characterized by scanning electron microscopy, showing a relatively smooth surface and a size of approximately 200 nm.

[0044] Furthermore, boron nitride nano-localized gel electrolytes were prepared via the following process:

[0045] 1.5 mL of pure water was measured into the reaction flask, hydroxylated boron nitride nanosheets were added, and the mixture was placed in an ultrasonic cleaner and sonicated for 30 min to ensure thorough mixing, thereby obtaining a dispersion of hydroxylated boron nitride nanosheets with a mass concentration of 0.1 mg / mL.

[0046] Weigh 0.05 g of 2-acrylamido-2-methyl-1-propanesulfonic acid and add it to a reaction flask. Place the flask in an ultrasonic cleaner and sonicate for 1 min to mix thoroughly. Add 16 μL of tetramethylethylenediamine to the reaction flask and sonicate for 1 min to mix thoroughly. Add 0.861 g of zinc sulfate to the reaction flask and sonicate for 5 min to mix thoroughly. Add 0.25 g of acrylamide to the reaction flask and sonicate for 1 min to mix thoroughly. Add 0.2 mL of acryloyloxyethyltrimethylammonium chloride to the flask and sonicate for 1 min to mix thoroughly. Then add 6 mg of ammonium persulfate and 40 μL of N,N'-methylenebisacrylamide solution and sonicate for 1 min to mix thoroughly to obtain the prepolymer solution.

[0047] The prepolymer solution was transferred into a glass mold and placed in an oven. Free radical polymerization was carried out at 40°C for 6 hours to obtain boron nitride nano-localized gel electrolyte.

[0048] The boron nitride nano-localized gel electrolyte prepared in this embodiment was assembled into a Zn-Zn symmetric battery and its electrochemical cycling stability was tested. The test results are as follows: Figure 1 As shown, it can be seen that at 1mA cm -2 Current density and 1mAhcm -2 At the given capacity density, the symmetric cell can cycle stably for approximately 600 hours. The surface gel electrolyte effectively suppresses the growth of zinc dendrites, resulting in good cycle stability.

[0049] Example 2

[0050] Using the same hydroxylated boron nitride nanosheets as in Example 1, a boron nitride nanolocalized gel electrolyte was prepared via the following process:

[0051] 1.5 mL of pure water was measured into the reaction flask, hydroxylated boron nitride nanosheets were added, and the mixture was placed in an ultrasonic cleaner and sonicated for 30 min to ensure thorough mixing, thereby obtaining a dispersion of hydroxylated boron nitride nanosheets with a mass concentration of 0.3 mg / mL.

[0052] Weigh 0.05 g of 2-acrylamido-2-methyl-1-propanesulfonic acid and add it to a reaction flask. Place the flask in an ultrasonic cleaner and sonicate for 1 min to mix thoroughly. Weigh 16 μL of tetramethylethylenediamine and add it to the reaction flask. Place the flask in an ultrasonic cleaner and sonicate for 1 min to mix thoroughly. Add 0.861 g of zinc sulfate to the reaction flask and sonicate for 5 min to mix thoroughly. Weigh 0.25 g of acrylamide and add it to the reaction flask. Place the flask in an ultrasonic cleaner and sonicate for 1 min to mix thoroughly. Add 0.2 mL of acryloyloxyethyltrimethylammonium chloride to the flask and sonicate for 1 min to mix thoroughly. Then add 6 mg of ammonium persulfate and 40 μL of N,N'-methylenebisacrylamide solution and sonicate for 1 min to mix thoroughly to obtain the prepolymer solution.

[0053] The prepolymer liquid was transferred into a glass mold and placed in an oven. Free radical polymerization was carried out at 40°C for 6 hours to obtain the boron nitride nano-localized gel electrolyte.

[0054] The boron nitride nano-localized gel electrolyte prepared in this embodiment was assembled into a Zn-Zn symmetric battery, and its electrochemical cycling stability was tested. The test results are as follows: Figure 2 As shown, it can be seen that at 1mA cm -2 Current density and 1mAh cm -2 At the given capacity density, the symmetric cell can cycle stably for approximately 700 hours. The surface gel electrolyte effectively suppresses the growth of zinc dendrites, resulting in good cycle stability.

[0055] Example 3

[0056] Using the same hydroxylated boron nitride nanosheets as in Example 1, a boron nitride nanolocalized gel electrolyte was prepared via the following process:

[0057] 1.5 mL of pure water was measured into the reaction flask, hydroxylated boron nitride nanosheets were added, and the mixture was placed in an ultrasonic cleaner and sonicated for 30 min to ensure thorough mixing and obtain a dispersion of hydroxylated boron nitride nanosheets with a mass concentration of 0.2 mg / mL.

[0058] Weigh 0.05 g of 2-acrylamido-2-methyl-1-propanesulfonic acid and add it to a reaction flask. Place the flask in an ultrasonic cleaner and sonicate for 1 min to mix thoroughly. Add 16 μL of tetramethylethylenediamine to the reaction flask and sonicate for 1 min to mix thoroughly. Add 0.861 g of zinc sulfate to the reaction flask and sonicate for 5 min to mix thoroughly. Add 0.25 g of acrylamide to the reaction flask and sonicate for 1 min to mix thoroughly. Add 0.2 mL of acryloyloxyethyltrimethylammonium chloride to the flask and sonicate for 1 min to mix thoroughly. Then add 6 mg of ammonium persulfate and 40 μL of N,N'-methylenebisacrylamide solution and sonicate for 1 min to mix thoroughly to obtain the prepolymer solution.

[0059] The prepolymer solution was transferred into a glass mold and placed in an oven. Free radical polymerization was carried out at 40°C for 6 hours to obtain the boron nitride nano-localized gel electrolyte. The boron nitride nano-localized gel electrolyte prepared in this embodiment was assembled into a Zn-Zn symmetric battery, and its electrochemical cycling stability was tested. Figure 3 and Figure 4 As shown, from Figure 3 It can be seen that at 1mA cm -2 Current density and 1mAh cm -2 At the specified capacity density, the symmetric cell can cycle stably for 1100 hours, indicating that the gel electrolyte effectively suppresses the growth of zinc dendrites and exhibits good cycle stability. Figure 4 It can be seen that even at 5mAcm -2 Current density and 5mAh cm -2 At the capacity density, the symmetric cell can also cycle stably for 350 hours, indicating that the gel electrolyte also has good cycle stability under high current.

[0060] The boron nitride nanogel electrolyte prepared in this embodiment was assembled into a Zn-Cu battery for electrochemical performance testing. The test results are as follows: Figure 5 As shown, it can be seen that at 1mA cm -2 Current density and 1mAh cm -2 At the specified capacity density, the Zn-Cu battery can cycle stably for 45 hours. After 45 hours, the battery loses stability due to the growth of zinc dendrites and the effects of side reactions. Calculations show that the coulombic efficiency of the Zn-Cu battery after 130 cycles is 99.24%.

[0061] Comparative Example 1

[0062] Weigh 0.05 g of 2-acrylamido-2-methyl-1-propanesulfonic acid and add it to a reaction flask. Place the flask in an ultrasonic cleaner and sonicate for 1 min to mix thoroughly. Add 16 μL of tetramethylethylenediamine to the reaction flask and sonicate for 1 min to mix thoroughly. Add 0.861 g of zinc sulfate to the reaction flask and sonicate for 5 min to mix thoroughly. Add 0.25 g of acrylamide to the reaction flask and sonicate for 1 min to mix thoroughly. Add 0.2 mL of acryloyloxyethyltrimethylammonium chloride to the flask and sonicate for 1 min to mix thoroughly. Adjust the amount of tetramethylethylenediamine catalyst to bring the pH to approximately 4. Then add 6 mg of ammonium persulfate and 40 μL of N,N'-methylenebisacrylamide solution and sonicate for 1 min to mix thoroughly to obtain the prepolymer solution.

[0063] The prepolymer solution was transferred into a glass mold and placed in an oven. Free radical polymerization was carried out at 40°C for 6 hours to obtain a gel electrolyte without hydroxylated boron nitride nanosheets.

[0064] The gel electrolyte prepared in this comparative example was assembled into a Zn-Zn symmetric cell, and its electrochemical cycling stability was tested. The test results are as follows: Figure 6 As shown, it can be seen that at 1mA cm -2 Current density and 1mAh cm -2 At the given capacity density, the symmetric cell can cycle stably for about 300 hours, which is much shorter than the cycle time of the symmetric cells in Examples 1-3. This indicates that the nano-hydrophobic domains formed after the addition of hydroxylated boron nitride nanosheets can effectively suppress the growth of zinc dendrites, thereby improving the cycle stability of the cell.

[0065] Furthermore, the mechanical properties of the gel electrolyte without hydroxylated boron nitride nanosheets in Comparative Example 1 and the boron nitride nanolocalized gel electrolyte in Example 3 were compared. The test results are as follows: Figure 7 As shown, the addition of hydroxylated boron nitride nanosheets significantly improves the tensile strength and elongation at break of the localized gel electrolyte. This indicates that the hydrogen bonding between the hydroxylated boron nitride nanosheets and the polymer network can effectively increase the energy dissipation of the gel during the stretching process, thereby improving the mechanical properties of the gel.

[0066] Comparative Example 2

[0067] Zinc sulfate was dissolved in deionized water to prepare a 2 mol / L zinc sulfate solution, which was used as the liquid electrolyte for an aqueous zinc-ion battery. A conventional glass fiber was used as the separator, and the liquid Zn-Zn symmetric battery was assembled for electrochemical cycle stability testing.

[0068] The results are attached. Figure 8 and Figure 9 As shown, where, as Figure 8 As shown, at 1mA cm -2 Current density and 1mAh cm -2 At a given capacity density, a symmetric cell can cycle stably for 220 hours. After 220 hours, the cell loses stability due to the growth of zinc dendrites and side reactions. Figure 9 As shown, at 5mA cm -2 Current density and 5mAh cm -2 At the specified capacity density, the aqueous symmetric battery experienced a short circuit and failed after 60 hours of cycling.

[0069] Furthermore, using 2 mol / L zinc sulfate as the aqueous zinc-ion battery electrolyte, conventional glass fiber as the separator, zinc foil as the negative electrode, and copper foil as the positive electrode, a liquid Zn-Cu battery was assembled and its electrochemical performance was tested. The test results are as follows: Figure 10 As shown, the calculated coulombic efficiency of the liquid Zn-Cu battery after 40 cycles is 31.50%.

[0070] Furthermore, the liquid Zn-Cu battery of Comparative Example 1 and the Zn-Cu battery of Example 3 were compared by cyclic voltammetry testing, with parameters set to -0.2V to 0.6V and a scan rate of 1 mV / s. -1 The test results are as follows Figure 11 As shown, the nucleation overpotential of the battery using boron nitride nano-localized gel electrolyte is approximately 67 mV, significantly higher than that of the aqueous battery (37 mV). This higher overpotential implies a greater potential difference is required for redox reactions to occur on the electrode surface, necessitating more energy for zinc ions to form nuclei and deposit uniformly on the negative electrode. In this case, the zinc ion solid-state diffusion current density is lower, which is beneficial for forming a uniform deposition layer. Conversely, a lower overpotential means that redox reactions can be induced by a lower potential difference. This can lead to rapid zinc deposition, causing smaller nuclei to grow and branch, forming dendrites. Therefore, from a nucleation kinetics perspective, gel electrolytes can effectively suppress the growth of new dendrites.

[0071] As can be seen from the above comparative examples, the gel electrolytes obtained in Examples 1-3 of the present invention can significantly improve the cycle performance of zinc-ion batteries.

[0072] It should be noted that the above descriptions are merely preferred embodiments of the present invention and should not limit the scope of protection of the technical solutions of the present invention. Any modifications made to the technical solutions described in the foregoing embodiments, or equivalent substitutions of technical features, by those skilled in the art within the spirit and principles of the present invention, should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a boron nitride nano-localized gel electrolyte, characterized by: It comprises the following steps: (1) mixing the hydroxylated boron nitride nanosheet with water and uniformly ultrasonic dispersing to obtain a hydroxyl boron nitride dispersion liquid with a mass concentration of 0.1-0.3 mg / mL; (2) adding monomers, zinc salt, initiator, crosslinking agent and catalyst into the hydroxyl boron nitride dispersion liquid to obtain a mixed liquid, adjusting the pH of the mixed liquid to 4.0-5.0 to obtain a gel prepolymer liquid; (3) heating and polymerizing the gel prepolymer liquid at 35-45 ℃ to obtain the boron nitride nanolocal gel electrolyte; The monomers include anionic monomers, cationic monomers and acryl monomers, the anionic monomers are 2-acrylamide-2-methylpropane sulfonic acid, the cationic monomers are acryloyloxyethyl trimethyl ammonium chloride, the acryl monomers are one or more of acrylamide, acrylic acid and methacrylic acid, and the concentration of the zinc salt is 0.5-2 mol / L.

2. The production method according to claim 1, characterized by, The hydroxylated boron nitride nanosheet is obtained by ball milling micron-sized boron nitride powder with sodium hydroxide aqueous solution, washing with water, ultrasonic dispersing and centrifugal processing, and then freeze-drying to obtain the hydroxylated boron nitride powder with a particle size of 150-250 nm. The zinc salt is selected from one or more of zinc sulfate, zinc chloride, zinc acetate, zinc nitrate and zinc perchlorate.

3. The preparation method according to claim 1, characterized in that, The initiator is ammonium persulfate and / or potassium persulfate, and the crosslinking agent is N, N'-methylene bisacrylamide and / or ethylene glycol bisacrylate.

4. The method of claim 1, wherein, The mass of the monomers is 10-20 wt% of the mass of the gel prepolymer liquid.

5. The preparation method according to claim 1, characterized in that, The temperature of the heating and polymerization is 40 ℃, and the time is 6-12 h.

6. The production method according to any one of claims 1 to 5, characterized by, The pH is adjusted by the content of the catalyst, and the catalyst is N, N, N', N'-tetramethyl ethylenediamine.

7. The boron nitride nanolocal gel electrolyte prepared by the preparation method according to any one of claims 1-6.

8. A zinc ion battery containing the boron nitride nanolocal gel electrolyte according to claim 7.

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