CN114940726A - Hydrogel and preparation method and application thereof - Google Patents

Hydrogel and preparation method and application thereof Download PDF

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CN114940726A
CN114940726A CN202210687852.7A CN202210687852A CN114940726A CN 114940726 A CN114940726 A CN 114940726A CN 202210687852 A CN202210687852 A CN 202210687852A CN 114940726 A CN114940726 A CN 114940726A
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hydrogel
pva
paa
initiator
preparation
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许耘浩
魏子栋
李存璞
任雨露
柏仕林
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Chongqing University Lithium Battery And New Materials Suining Research Institute
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Chongqing University Lithium Battery And New Materials Suining Research Institute
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F261/00—Macromolecular compounds obtained by polymerising monomers on to polymers of oxygen-containing monomers as defined in group C08F16/00
    • C08F261/02—Macromolecular compounds obtained by polymerising monomers on to polymers of oxygen-containing monomers as defined in group C08F16/00 on to polymers of unsaturated alcohols
    • C08F261/04—Macromolecular compounds obtained by polymerising monomers on to polymers of oxygen-containing monomers as defined in group C08F16/00 on to polymers of unsaturated alcohols on to polymers of vinyl alcohol
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
    • C08J3/075—Macromolecular gels
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M12/00—Hybrid cells; Manufacture thereof
    • H01M12/04—Hybrid cells; Manufacture thereof composed of a half-cell of the fuel-cell type and of a half-cell of the primary-cell type
    • H01M12/06—Hybrid cells; Manufacture thereof composed of a half-cell of the fuel-cell type and of a half-cell of the primary-cell type with one metallic and one gaseous electrode
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2351/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

The invention discloses a hydrogel and a preparation method and application thereof. A method of making a hydrogel comprising the steps of: dissolving vinyl alcohol in water, adding acrylic acid and an initiator to react and form a film to obtain the hydrogel. The invention provides a preparation method of hydrogel, wherein the hydrogel is prepared from polyvinyl alcohol and acrylic acid through an initiator, the preparation method is simple, the prepared hydrogel has good mechanical properties, is not easy to stretch and deform and break, has good restorability, can still normally work even being stretched to 2.5 times, does not spontaneously combust after being subjected to severe impact, avoids safety accidents, and greatly widens the application range of the hydrogel as a solid electrolyte.

Description

Hydrogel and preparation method and application thereof
Technical Field
The invention relates to the technical field of materials, in particular to hydrogel and a preparation method and application thereof.
Background
The prior art shows that an alkaline metal-air battery system has the advantages of high ionic conductivity, low viscosity, large oxygen diffusion coefficient, fast reaction kinetics and the like, the performance of the alkaline aluminum-air battery is obviously superior to that of a neutral or acid aluminum-air battery, and in an alkaline electrolyte system, a liquid storage space needs to be reserved for storing liquid electrolyte, so that the volume of the battery is greatly increased. The alkaline electrolyte taking water as a solvent greatly increases the weight of the battery, and potential safety hazards are increased due to corrosion of a liquid storage container; on the other hand, alkaline electrolyte can passivate the metal surface, seriously hamper the normal chemical reaction inside the battery, and reduce the capacity and power of the battery. For the chemical reaction of Al (OH) 3 The problem of reduced electrode discharge efficiency caused by deposition on the surface of an electrode is solved, researchers propose that corrosion inhibitor is used for relieving corrosion of aluminum sheet, for example, ZnO can be used as inhibitor of aluminum corrosion in alkaline solution to inhibit hydrogen precipitation, and has little influence on other properties of the anode; in addition, some environment-friendly organic compounds such as urea and thiourea are beneficial to inhibiting the self-corrosion of the aluminum-air battery in an alkaline medium, and the urea and the thiourea can form a uniform adsorption layer on the surface of an aluminum sheet to prevent the direct contact of an electrolyte and the aluminum sheet, thereby playing a role in protecting the aluminum sheet. However, in the prior art, the high concentration of alkaline electrolyte still has the risk of corrosion of the storage container and leakage, and even if a neutral electrolyte is used, the problem of carrying a large-volume liquid storage tank must be faced, which means that the battery has a large product volume and a heavy product quality, and the requirement of the battery for portability cannot be met. Meanwhile, special materials are needed for sealing the electrolyte, which not only causes the loss of the energy density of the battery, but also greatly increases the cost of the battery. Based on the above disadvantages of high risk and difficulty in transportation of alkaline air batteries using liquid as electrolyte, it is necessary to develop an electrolyte that can effectively avoid the above problems.
Disclosure of Invention
In order to overcome the problems of high risk and difficult transportation of liquid electrolytes of alkaline air batteries in the prior art, the invention aims to provide a hydrogel which can be used as a solid electrolyte of the alkaline air battery, the second aim of the invention is to provide a preparation method of the hydrogel, and the third aim of the invention is to provide application of the hydrogel.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a preparation method of hydrogel in a first aspect, which comprises the following steps:
and (3) dissolving polyvinyl alcohol (PVA) in water, adding Acrylic Acid (AA) and an initiator to react to form a film, and obtaining the hydrogel.
Preferably, in the preparation method of the hydrogel, the initiator comprises at least one of ammonium persulfate, potassium persulfate, sodium persulfate and N, N' -methylene-bisacrylamide; further preferably, the initiator comprises one of ammonium persulfate, potassium persulfate and sodium persulfate; still more preferably, the initiator is ammonium persulfate.
Preferably, in the preparation method of the hydrogel, the mass ratio of the polyvinyl alcohol to the acrylic acid to the initiator is 1: (0.5-1.5): (0.02-0.25); more preferably, the mass ratio of the polyvinyl alcohol to the acrylic acid to the initiator is 1: (0.8-1.2): (0.02-0.25); still more preferably, the mass ratio of the polyvinyl alcohol, the acrylic acid and the initiator is 1: 1: (0.02-0.25).
Preferably, in the preparation method of the hydrogel, the polyvinyl alcohol is dissolved in deionized water and then acrylic acid is added; further preferably, the temperature of the deionized water is 50 to 100 ℃.
Preferably, in the preparation method of the hydrogel, the polyvinyl alcohol is dissolved in water and stirred until the polyvinyl alcohol is completely dissolved, and then the acrylic acid is added; further preferably, the stirring time is 0.5-1.5 h; still more preferably, the stirring time is 1 hour.
Preferably, in the preparation method of the hydrogel, the initiator is added and stirred for 20-40min, and then the mixture is poured into a template to react and form a film.
Preferably, in the preparation method of the hydrogel, the temperature for forming the film by reaction is 50-100 ℃; further preferably, the temperature for forming the film by reaction is 60-90 ℃; still further preferably, the temperature for forming the film by reaction is 70-90 ℃; more preferably, the temperature for the film formation reaction is 80 ℃.
Preferably, in the preparation method of the hydrogel, the reaction film-forming time is 1-5 h; further preferably, the time for reaction film formation is 1.5-4 h; still further preferably, the time for reaction and film formation is 1.5-3 h; more preferably, the time for reaction to form a film is 2 hours.
The second aspect of the present invention provides a hydrogel prepared by the above-mentioned method for preparing a hydrogel.
In a third aspect, the present invention provides the use of the above hydrogel in an alkaline metal-air cell.
Preferably, in the application, the hydrogel is soaked in a KOH solution of 1-7mol/L and taken out after soaking to be used as the electrolyte of the alkaline metal-air battery; preferably, the hydrogel is soaked in 2-6mol/L KOH solution and taken out to be used as the electrolyte of the alkaline metal-air battery; still more preferably, the hydrogel is soaked in 6mol/L KOH solution and taken out after soaking to be used as an electrolyte of the alkaline metal-air battery.
Preferably, the soaking time of the hydrogel in a 1-7mol/L KOH solution is 3-5 h; further preferably, the soaking time is 3.5-4.5 h; still more preferably, the soaking time is 4 hours.
Preferably, in this application, the alkaline metal-air cell is an aluminum-air cell; further preferably, the hydrogel is applied to an aluminum-air battery electrolyte.
According to the hydrogel prepared by the preparation method disclosed by the invention, the hydrogel is connected with a reticular structure, water and oxygen are timely transmitted to an active center as reactants in an electrochemical reaction process in a gel electrolyte system, so that the rapid occurrence of an oxygen reduction reaction is ensured, alkaline substances generated by an anode are timely transmitted out of a catalyst layer, and the phenomenon that an alkaline metal-air battery generates extra overpotential due to concentration polarization to influence the discharge effect is avoided.
The invention has the beneficial effects that:
the invention provides a preparation method of hydrogel, wherein the hydrogel is prepared from polyvinyl alcohol and acrylic acid through an initiator, the preparation method is simple, the prepared hydrogel has good mechanical properties, is not easy to stretch and deform and break, has good restorability, can still normally work even if being stretched to 2.5 times, is not self-ignited after bearing severe impact, avoids safety accidents, and greatly widens the application range of the hydrogel as a solid electrolyte.
The hydrogel prepared by the preparation method can be used as a solid electrolyte for an alkaline metal-air battery, and can effectively reduce the volume of the battery, reduce the weight of the battery and relieve the corrosion passivation of a metal pole piece.
Drawings
FIG. 1 is an SEM image of the cross-section and surface of a PVA-PAA hydrogel of example 1.
FIG. 2 is a diagram showing the state of the PVA-PAA-6M KOH hydrogel of example 1 in torsion and stretching.
FIG. 3 is a tensile strain curve of the PVA-PAA-6M KOH hydrogel of example 1.
FIG. 4 is a TGA plot of the PVA-PAA hydrogel of example 1 and the PVA-PAA-6M KOH hydrogel.
FIG. 5 is a diagram of EIS before and after discharging of PVA-PAA-6M KOH hydrogel of example 1.
FIG. 6 is the XRD pattern before and after discharging of the PVA-PAA-6M KOH hydrogel of example 1.
Fig. 7 is an XRD pattern of the aluminum sheet before and after discharge in example 1.
Fig. 8 is a graph of the discharge power performance of the battery systems of examples 1-3.
Fig. 9 is a graph of discharge time performance for the battery systems of examples 1-3.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1
The hydrogel of this example was prepared as follows:
weighing 2g of PVA, dissolving the PVA in deionized water, magnetically stirring the mixture for 1h at the temperature of 80 ℃ until the PVA is completely dissolved, then adding 2g of AA monomer into the PVA solution, stirring the mixture for 1h to well disperse AA in the solution, then adding 0.1g of ammonium persulfate serving as an initiator, and continuing stirring the mixture for 30 min;
pouring the mixed solution into a glass plate, sealing the glass plate by using a preservative film, putting the glass plate into an oven at 80 ℃ for continuous reaction for 2 hours to form a film, and obtaining the hydrogel, wherein the obtained material is named as PVA-PAA hydrogel.
The application of the hydrogel of this example in an aluminum air cell is as follows:
adding the PVA-PAA hydrogel into 20mL of 6M KOH solution to be soaked for 4 h; pouring out the residual KOH solution which is not absorbed, and placing the KOH solution in a cool and dry place for later use to obtain the conductive hydrogel which is named as PVA-PAA-6M KOH hydrogel.
Cutting into 2 × 2cm 2 Size PVA-PAA-6M KOH hydrogel and 2X 2cm 2 The carbon paper with the size is coated with a commercial 20% Pt/C electrode, and the coated carbon paper, PVA-PAA-6M KOH hydrogel and aluminum sheets are combined to form a battery system. And respectively carrying out performance tests on the Princeton electrochemical workstation and the blue test system.
The test result shows that the peak power is 202mW, and the discharging time at low current is 8h in the conductive hydrogel.
SEM pictures of the cross section and the surface of the PVA-PAA hydrogel prepared in this example are shown in FIG. 1, the pictures (a) and (b) are SEM pictures of the cross section of the hydrogel at different magnifications, and in FIG. 1, the pictures (c) and (d) are SEM pictures of the surface of the hydrogel at different magnifications.
The state diagram of the PVA-PAA-6M KOH hydrogel prepared in this example during twisting and stretching is shown in FIG. 2, wherein the diagram (a) in FIG. 2 is the diagram during twisting, the diagram (b) is the diagram during stretching, and the PVA-PAA-6M KOH hydrogel in the diagram (b) is stretched to about 2.5 times the original length.
The tensile strain curve of the PVA-PAA-6M KOH hydrogel prepared in this example is shown in FIG. 3.
The TGA profile (thermogravimetric analysis) of the PVA-PAA hydrogel and PVA-PAA-6M KOH hydrogel prepared in this example is shown in FIG. 4.
EIS before and after discharging of the PVA-PAA-6M KOH hydrogel prepared in this example is shown in FIG. 5.
XRD patterns before and after discharging of the PVA-PAA-6M KOH hydrogel prepared in the example are shown in FIG. 6.
The XRD patterns of the aluminum sheets before and after discharge in this example are shown in FIG. 7.
The discharge power performance of the battery system of this example is shown in fig. 8, and the discharge time performance of the battery system of this example is shown in fig. 9.
Example 2
The hydrogel of this example was prepared as follows:
weighing 2g of PVA, dissolving the PVA in deionized water, magnetically stirring the mixture for 1h at the temperature of 80 ℃ until the PVA is completely dissolved, then adding 2g of AA monomer into the PVA solution, stirring the mixture for 1h to well disperse AA in the solution, then adding 0.1g of ammonium persulfate serving as an initiator, and continuing stirring the mixture for 30 min;
pouring the mixed solution into a glass plate, sealing the glass plate by using a preservative film, putting the glass plate into an oven at 80 ℃ for continuous reaction for 2 hours to form a film, and obtaining the hydrogel, wherein the obtained material is named as PVA-PAA hydrogel.
The application of the hydrogel of this example in an aluminum air cell is as follows:
adding the PVA-PAA hydrogel into 20mL of 2M KOH solution to be soaked for 4 h; pouring out the residual KOH solution which is not absorbed, and placing the KOH solution in a cool and dry place for later use to obtain the conductive hydrogel which is named as PVA-PAA-2M KOH hydrogel.
Cutting into 2 × 2cm pieces 2 Size PVA-PAA-2M KOH hydrogel and 2X 2cm 2 The carbon paper with the size is coated with a commercial 20% Pt/C electrode, and the coated carbon paper, PVA-PAA-2M KOH hydrogel and aluminum sheets are combined to form a battery system. And respectively carrying out performance tests on the Princeton electrochemical workstation and the blue test system.
The test result shows that the peak power is 92mW, and the discharging time is 5h under low current in the conductive hydrogel.
The discharge power performance of the battery system of this example is shown in fig. 8, and the discharge time performance of the battery system of this example is shown in fig. 9.
Example 3
The hydrogel of this example was prepared as follows:
weighing 2g of PVA, dissolving the PVA in deionized water, magnetically stirring the mixture for 1h at the temperature of 80 ℃ until the PVA is completely dissolved, then adding 2g of AA monomer into the PVA solution, stirring the mixture for 1h to well disperse AA in the solution, then adding 0.1g of ammonium persulfate serving as an initiator, and continuing stirring the mixture for 30 min;
and pouring the mixed solution into a glass plate, sealing the glass plate by using a preservative film, and then putting the glass plate into an oven with the temperature of 80 ℃ for continuous reaction for 2 hours to form a film, thus obtaining the hydrogel, wherein the obtained material is named as PVA-PAA hydrogel.
The application of the hydrogel of this example in an aluminum air cell is as follows:
adding the PVA-PAA hydrogel into 20mL of 1M KOH solution to be soaked for 4 h; pouring out the residual KOH unabsorbed solution, and placing the KOH unabsorbed solution in a cool and dry place for later use.
Cutting into 2 × 2cm 2 Size PVA-PAA-1M KOH hydrogel and 2X 2cm 2 The carbon paper with the size is coated with a commercial 20% Pt/C electrode, and the coated carbon paper, PVA-PAA-1M KOH hydrogel and aluminum sheets are combined to form a battery system. And respectively carrying out performance tests on the Princeton electrochemical workstation and the blue test system.
The test result shows that the peak power is 62mW, and the discharging time is 2h under low current in the conductive hydrogel.
The discharge power performance of the battery system of this example is shown in fig. 8, and the discharge time performance of the battery system of this example is shown in fig. 9.
Example 4
The hydrogel of this example was prepared as follows:
weighing 2g of PVA, dissolving the PVA in deionized water, magnetically stirring the PVA solution at 80 ℃ for 1h until the PVA is completely dissolved, then adding 2g of AA monomer into the PVA solution, stirring the mixture for 1h to well disperse AA in the solution, then adding 0.1g of ammonium persulfate serving as an initiator, and continuing stirring the mixture for 30 min;
pouring the mild solution into a glass plate, sealing the glass plate by using a preservative film, putting the glass plate into an oven at 80 ℃ for continuous reaction for 2 hours to form a film, and obtaining the hydrogel, wherein the obtained material is named as PVA-PAA hydrogel.
The hydrogel of this example was used in an aluminum air cell as follows:
adding the PVA-PAA hydrogel into 20mL of 1M NaCl solution to soak for 4 h; pouring out the residual NaCl solution which is not absorbed, and placing the solution in a cool and dry place for later use.
Cutting into 2 × 2cm 2 PVA-PAA-1M NaCl hydrogel of size and 2X 2cm 2 The carbon paper with the size is coated with a commercial 20% Pt/C electrode, and the coated carbon paper, PVA-PAA-1M NaCl hydrogel and aluminum sheets are combined to form a battery system. And respectively carrying out performance test on the Princeton electrochemical workstation and the blue test system.
Test results show that the peak power of the conductive hydrogel is 22mW, and the conductive hydrogel can not work for more than 30min under low current.
Example 5
The hydrogel of this example was prepared as follows:
weighing 2g of PVA, dissolving the PVA in deionized water, magnetically stirring the mixture for 1h at the temperature of 80 ℃ until the PVA is completely dissolved, then adding 2g of AA monomer into the PVA solution, stirring the mixture for 1h to well disperse AA in the solution, then adding 0.1g of ammonium persulfate serving as an initiator, and continuing stirring the mixture for 30 min;
pouring the mixed solution into a glass plate, sealing the glass plate by using a preservative film, putting the glass plate into an oven at 80 ℃ for continuous reaction for 2 hours to form a film, and obtaining the hydrogel, wherein the obtained material is named as PVA-PAA hydrogel.
The application of the hydrogel of this example in an aluminum air cell is as follows:
adding the PVA-PAA hydrogel into 20mL of 2M NaCl solution to soak for 4 h; pouring out the residual NaCl solution which is not absorbed, and placing the NaCl solution in a cool and dry place for later use.
Cutting into 2 × 2cm 2 PVA-PAA-2M NaCl hydrogel of size and 2X 2cm 2 The carbon paper with the size is coated with a commercial 20% Pt/C electrode, and the coated carbon paper, PVA-PAA-2M NaCl hydrogel and aluminum sheets are combined to form a battery system. In generalAnd respectively carrying out performance test on the Linston electrochemical workstation and the blue test system.
Test results show that the peak power of the conductive hydrogel is 15mW, and the conductive hydrogel can not work for more than 30min under low current.
Example 6
The hydrogel of this example was prepared as follows:
weighing 2g of PVA, dissolving the PVA in deionized water, magnetically stirring the mixture for 1h at the temperature of 80 ℃ until the PVA is completely dissolved, then adding 2g of Acrylic Acid (AA) monomer into the PVA solution, stirring the mixture for 1h to well disperse AA in the solution, then adding 0.1g of ammonium persulfate serving as an initiator, and continuing stirring the mixture for 30 min;
pouring the mixed solution into a glass plate, sealing the glass plate by using a preservative film, putting the glass plate into an oven at 80 ℃ for continuous reaction for 2 hours to form a film, and obtaining the hydrogel, wherein the obtained material is named as PVA-PAA hydrogel.
The application of the hydrogel of this example in an aluminum air cell is as follows:
adding the PVA-PAA hydrogel into 20mL of 3M NaCl solution to be soaked for 4 h; pouring out the residual NaCl solution which is not absorbed, and placing the solution in a cool and dry place for later use.
Cutting into 2 × 2cm 2 PVA-PAA-3M NaCl hydrogel of size and 2X 2cm 2 The carbon paper with the size is coated with a commercial 20% Pt/C electrode, and the coated carbon paper, PVA-PAA-3M NaCl hydrogel and aluminum sheets are combined to form a battery system. And respectively carrying out performance tests on the Princeton electrochemical workstation and the blue test system.
Test results show that the peak power of the conductive hydrogel is 7mW, and the conductive hydrogel can not work for more than 30min under low current.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A method for preparing a hydrogel, comprising the steps of:
and (3) dissolving polyvinyl alcohol in water, adding acrylic acid and an initiator, and reacting to form a film to obtain the hydrogel.
2. The method of claim 1, wherein the initiator comprises at least one of ammonium persulfate, potassium persulfate, sodium persulfate, and N, N' -methylenebisacrylamide.
3. The method for preparing the hydrogel according to claim 1, wherein the mass ratio of the polyvinyl alcohol, the acrylic acid and the initiator is 1: (0.5-1.5): (0.02-0.25).
4. The method for preparing a hydrogel according to claim 1, wherein the temperature for the reaction to form a film is 50 to 100 ℃.
5. The method for preparing the hydrogel according to claim 4, wherein the reaction time for forming the film is 1 to 5 hours.
6. A hydrogel produced by the method for producing a hydrogel according to any one of claims 1 to 5.
7. Use of the hydrogel of claim 6 in an alkaline metal-air cell.
8. The use of claim 7, wherein the hydrogel is soaked in a 1-7mol/L KOH solution and removed after soaking as an alkaline metal-air battery electrolyte.
9. Use according to claim 8, wherein the soaking time is 3-5 h.
10. Use according to claim 7, wherein the alkaline metal-air battery is an aluminium-air battery.
CN202210687852.7A 2022-06-17 2022-06-17 Hydrogel and preparation method and application thereof Pending CN114940726A (en)

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US20100105801A1 (en) * 2007-04-24 2010-04-29 The General Hospital Corporation Pva-paa hydrogels
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