CN116315313A - Preparation method and application of physical cross-linked hydrogel electrolyte mainly based on entanglement - Google Patents
Preparation method and application of physical cross-linked hydrogel electrolyte mainly based on entanglement Download PDFInfo
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- 239000000017 hydrogel Substances 0.000 title claims abstract description 75
- 239000003792 electrolyte Substances 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000003999 initiator Substances 0.000 claims abstract description 18
- KWIUHFFTVRNATP-UHFFFAOYSA-N Betaine Natural products C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 claims abstract description 15
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical compound C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 claims abstract description 15
- 239000007864 aqueous solution Substances 0.000 claims abstract description 15
- 229960003237 betaine Drugs 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000004132 cross linking Methods 0.000 claims abstract description 4
- BCAIDFOKQCVACE-UHFFFAOYSA-N 3-[dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]azaniumyl]propane-1-sulfonate Chemical compound CC(=C)C(=O)OCC[N+](C)(C)CCCS([O-])(=O)=O BCAIDFOKQCVACE-UHFFFAOYSA-N 0.000 claims abstract description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 24
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 18
- 239000011259 mixed solution Substances 0.000 claims description 18
- 239000011780 sodium chloride Substances 0.000 claims description 12
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 3
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 2
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 238000002156 mixing Methods 0.000 abstract description 9
- 230000008961 swelling Effects 0.000 abstract description 3
- 239000011521 glass Substances 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 11
- 239000000741 silica gel Substances 0.000 description 11
- 229910002027 silica gel Inorganic materials 0.000 description 11
- 239000000243 solution Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 3
- 239000007784 solid electrolyte Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000011245 gel electrolyte Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 239000011244 liquid electrolyte Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- 238000007614 solvation Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- 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
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
-
- 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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/38—Esters containing sulfur
- C08F220/387—Esters containing sulfur and containing nitrogen and oxygen
-
- 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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
- C08K5/19—Quaternary ammonium compounds
-
- 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 preparation method and application of a physical cross-linked hydrogel electrolyte mainly based on entanglement, wherein the preparation method comprises the following steps: adding acrylamide into an initiator aqueous solution, and uniformly mixing; sequentially adding [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide and betaine, and stirring and mixing; standing for a period of time until bubbles disappear; injecting the obtained mixed liquid into a mold, sealing the mold, putting the mold into a constant-temperature oven for crosslinking reaction, and finally obtaining a hydrogel film; immersing the hydrogel film into an electrolyte to obtain the hydrogel electrolyte. The preparation method adopted by the invention is green and safe, the preparation process is simple and convenient, the prepared high-entanglement hydrogel has excellent tensile property and higher electrolyte swelling rate, can be applied to flexible aluminum-air batteries after absorbing the electrolyte, has wide applicability, and has important significance for the production and application of the flexible aluminum-air batteries.
Description
Technical Field
The invention relates to the technical field of hydrogel electrolytes, in particular to a preparation method and application of a physical cross-linked hydrogel electrolyte mainly comprising winding.
Background
In recent years, flexible wearable electronics have been attracting attention, and energy storage products have begun to be widely studied as a very important part of them. The water-based aluminum-air battery has the advantages of high theoretical energy density, environmental friendliness, large aluminum storage capacity, high safety and the like, but has the defects of electrolyte leakage, easiness in freezing of the electrolyte and the like.
The hydrogel is used as a quasi-solid electrolyte between a solid electrolyte and a liquid electrolyte, so that on one hand, the electrolyte of the battery can be prevented from leaking in the use process, and the safety of the device in the use process is better ensured. On the other hand, the contact resistance can be better attached to the electrode, and the battery performance is improved. Therefore, the application of the hydrogel electrolyte in the research field of the water-based aluminum air battery has important significance, and at present, the hydrogel quasi-solid electrolyte is mainly chemically crosslinked and rarely reported.
Disclosure of Invention
The invention aims to provide a preparation method and application of a physical cross-linked hydrogel electrolyte mainly based on entanglement, so as to solve the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the preparation method of the physical cross-linked hydrogel electrolyte mainly comprising the following steps:
step 1: 1-2.5g of acrylamide is weighed and added into 2mL of initiator aqueous solution to be uniformly mixed;
step 2: adding 0.9-2.2g of [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide (hereinafter referred to as DMAPS) to the mixed solution obtained in the step 1, and then continuously adding 1.5g of betaine to stir and mix;
step 3: standing the mixed solution obtained in the step 2 for a period of time until bubbles disappear;
step 4: injecting the mixed liquid obtained in the step 3 into a mold, sealing the mold, putting the mold into a constant-temperature oven for crosslinking reaction, and finally obtaining a hydrogel film;
step 5: immersing the hydrogel film obtained in the step 4 into electrolyte for a period of time to obtain the hydrogel electrolyte.
As a further scheme of the invention: the initiator in the step 1 is one or two of potassium persulfate and ammonium persulfate, and the concentration of the aqueous solution of the initiator is 0.01-0.05mol/L.
As a further scheme of the invention: the betaine concentration in the step 2 is 0.5-1.5g/mL.
As a further scheme of the invention: the temperature of the constant temperature oven in the step 4 is 55-65 ℃ and the reaction time is 2.5-4.5 h.
As a further scheme of the invention: the soaking time of the hydrogel film in the electrolyte in the step 5 is 24-72 h.
As a further scheme of the invention: the electrolyte in the step 5 can be sodium chloride or potassium hydroxide, wherein the sodium chloride is sodium chloride aqueous solution, and the mass percentage is 10%. The potassium hydroxide is aqueous solution of potassium hydroxide, and the concentration is 1-6mol/L.
It is another object of the present invention to provide the use of entanglement-based physically crosslinked hydrogel electrolytes in flexible aluminum-air batteries.
Compared with the prior art, the invention has the beneficial effects that: the preparation method adopted by the invention is green and safe, the preparation process is simple and convenient, the prepared high-entanglement hydrogel has excellent tensile property and higher electrolyte swelling rate, and the high-entanglement hydrogel can be applied to flexible aluminum-air batteries after absorbing the electrolyte, has wide applicability and has important significance for the production and application of the flexible aluminum-air batteries.
Drawings
Fig. 1 is a scanning electron microscope image of embodiment 5 of the present invention.
FIG. 2 is a stress-strain graph of comparative example 1 and examples 1-4 of the present invention.
FIG. 3 shows the electrolyte absorption rates of comparative example 2 and examples 6 to 10 according to the present invention.
Fig. 4 is a graph showing power density of the aluminum-air batteries manufactured in example 10 and comparative example 2 according to the present invention.
Fig. 5 is a constant current discharge graph at different current densities of the aluminum-air batteries manufactured using example 10 and comparative example 2 of the present invention.
Fig. 6 is an open circuit voltage graph of the aluminum-air batteries manufactured using example 10 and comparative example 2 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1 a hydrogel film was prepared from various concentrations of entangled hydrogels.
1.18g of acrylamide and 2mL of 0.01mol/L initiator aqueous solution are weighed and mixed uniformly, then 0.93g of DMAPS and 1.5g of betaine are added in sequence, stirring and mixing are continued, and standing is carried out for a period of time until bubbles disappear, so as to obtain a mixed solution. And (3) injecting the mixed liquid into a glass mold with a silica gel pad with the thickness of 2mm, sealing, and then placing the glass mold into a 60 ℃ oven for reaction for 2.5 hours to obtain the hydrogel film with a high entanglement structure.
Example 2 a hydrogel film was prepared from various concentrations of entangled hydrogels.
1.54g of acrylamide and 2mL of 0.01mol/L aqueous initiator solution are weighed and mixed uniformly, then 1.21g of DMAPS and 1.5g of betaine are added in sequence, stirring and mixing are continued, and standing is carried out for a period of time until bubbles disappear, so as to obtain a mixed solution. And (3) injecting the mixed liquid into a glass mold with a silica gel pad with the thickness of 2mm, sealing, and then placing the glass mold into a 60 ℃ oven for reaction for 2.5 hours to obtain the hydrogel film with a high entanglement structure.
Example 3 one hydrogel film of different concentrations of entangled hydrogels was prepared.
1.89g of acrylamide and 2mL of 0.01mol/L aqueous initiator solution are weighed and mixed uniformly, then 1.49g of DMAPS and 1.5g of betaine are added in sequence, stirring and mixing are continued, and standing is carried out for a period of time until bubbles disappear, so as to obtain a mixed solution. And (3) injecting the mixed liquid into a glass mold with a silica gel pad with the thickness of 2mm, sealing, and then placing the glass mold into a 60 ℃ oven for reaction for 2.5 hours to obtain the hydrogel film with a high entanglement structure.
Example 4 one hydrogel film was prepared from various concentrations of entangled hydrogels.
2.37g of acrylamide and 2mL of 0.01mol/L aqueous initiator solution are weighed and mixed uniformly, then 1.86g of DMAPS and 1.5g of betaine are added in sequence, stirring and mixing are continued, and standing is carried out for a period of time until bubbles disappear, so as to obtain a mixed solution. And (3) injecting the mixed liquid into a glass mold with a silica gel pad with the thickness of 2mm, sealing, and then placing the glass mold into a 60 ℃ oven for reaction for 2.5 hours to obtain the hydrogel film with a high entanglement structure.
Comparative example 1 a conventional hydrogel film was prepared.
1.89g of acrylamide is weighed and evenly mixed with 2mL of 0.01mol/L aqueous initiator solution. And (3) injecting the liquid into a glass die with a silica gel pad with the thickness of 2mm, sealing, and then placing the glass die into a 60 ℃ oven for reaction for 2.5 hours to obtain the hydrogel film with the comparison sample.
The stress-strain curves obtained by the tensile test of examples 1 to 4 and comparative example 1 are shown in FIG. 2. The results in FIG. 2 show that the mechanical properties of the hydrogel films obtained by polymerizing monomers at different concentrations are greatly different. The betaine and the zwitterionic branched chains on the polymer network form an electrostatic network, so that the ductility of the hydrogel film is improved. As the monomer concentration increases, the mechanical strength of the hydrogel film increases. Wherein example 3 maximum energy to break
Example 5
The hydrogel film obtained in example 3 was immersed in ultrapure water for 5 days, the solvent was changed every day, and after complete swelling, it was put into a freeze dryer to freeze-dry for 12 hours to obtain xerogel.
The xerogel scanning electron microscope image obtained in this example is shown in FIG. 1. As can be seen from fig. 1, the gel polymer has a porous structure. The abundant porous structure is favorable for adsorbing more electrolyte and accelerating ion migration, so that the ion conductivity of the gel electrolyte is improved.
Example 6 a method of preparing a entanglement-based physically crosslinked hydrogel electrolyte comprising the steps of:
step 1: 1.77g of acrylamide is weighed and added into 2mL of initiator aqueous solution to be uniformly mixed;
step 2: adding 2.08g of DMAPS into the mixed solution obtained in the step 1, and then continuously adding 1.5g of betaine, and stirring and mixing;
step 3: standing the mixed solution obtained in the step 2 for a period of time until bubbles disappear;
step 4: injecting the mixed liquid obtained in the step 3 into a glass mold with a silica gel pad of 2mm thickness, sealing, and then placing the glass mold into a 60 ℃ oven for reaction for 2.5 hours to obtain a hydrogel film with a high entanglement structure;
step 5: and (3) immersing the hydrogel film obtained in the step (4) in 10% sodium chloride electrolyte for 48 hours to obtain the high-entanglement hydrogel electrolyte.
Example 7 a method of preparing a entanglement-based physically crosslinked hydrogel electrolyte comprising the steps of:
step 1: 1.84g of acrylamide is weighed and added into 2mL of initiator aqueous solution to be uniformly mixed;
step 2: adding 1.74g of DMAPS into the mixed solution obtained in the step 1, and then continuously adding 1.5g of betaine to stir and mix;
step 3: standing the mixed solution obtained in the step 2 for a period of time until bubbles disappear;
step 4: injecting the mixed liquid obtained in the step 3 into a glass mold with a silica gel pad of 2mm thickness, sealing, and then placing the glass mold into a 60 ℃ oven for reaction for 2.5 hours to obtain a hydrogel film with a high entanglement structure;
step 5: and (3) immersing the hydrogel film obtained in the step (4) in 10% sodium chloride electrolyte for 48 hours to obtain the high-entanglement hydrogel electrolyte.
Example 8 a method of preparing a entanglement-based physically crosslinked hydrogel electrolyte comprising the steps of:
step 1: 1.93g of acrylamide is weighed and added into 2mL of initiator aqueous solution to be uniformly mixed;
step 2: adding 1.30g of DMAPS into the mixed solution obtained in the step 1, and then continuously adding 1.5g of betaine, and stirring and mixing;
step 3: standing the mixed solution obtained in the step 2 for a period of time until bubbles disappear;
step 4: injecting the mixed liquid obtained in the step 3 into a glass mold with a silica gel pad of 2mm thickness, sealing, and then placing the glass mold into a 60 ℃ oven for reaction for 2.5 hours to obtain a hydrogel film with a high entanglement structure;
step 5: and (3) immersing the hydrogel film obtained in the step (4) in 10% sodium chloride electrolyte for 48 hours to obtain the high-entanglement hydrogel electrolyte.
Example 9 a method for preparing a kink-based physically crosslinked hydrogel electrolyte comprising the steps of:
step 1: 1.96g of acrylamide is weighed and added into 2mL of initiator aqueous solution to be uniformly mixed;
step 2: adding 1.16g of DMAPS into the mixed solution obtained in the step 1, and then continuously adding 1.5g of betaine to stir and mix;
step 3: standing the mixed solution obtained in the step 2 for a period of time until bubbles disappear;
step 4: injecting the mixed liquid obtained in the step 3 into a glass mold with a silica gel pad of 2mm thickness, sealing, and then placing the glass mold into a 60 ℃ oven for reaction for 2.5 hours to obtain a hydrogel film with a high entanglement structure;
step 5: and (3) immersing the hydrogel film obtained in the step (4) in 10% sodium chloride electrolyte for 48 hours to obtain the high-entanglement hydrogel electrolyte.
Example 10 a method of preparing a entanglement-based physically crosslinked hydrogel electrolyte comprising the steps of:
step 1: 1.89g of acrylamide is weighed and added into 2mL of initiator aqueous solution to be uniformly mixed;
step 2: adding 1.49g of DMAPS into the mixed solution obtained in the step 1, and then continuously adding 1.5g of betaine, and stirring and mixing;
step 3: standing the mixed solution obtained in the step 2 for a period of time until bubbles disappear;
step 4: injecting the mixed liquid obtained in the step 3 into a glass mold with a silica gel pad of 2mm thickness, sealing, and then placing the glass mold into a 60 ℃ oven for reaction for 2.5 hours to obtain a hydrogel film with a high entanglement structure;
step 5: and (3) immersing the hydrogel film obtained in the step (4) in 10% sodium chloride electrolyte for 48 hours to obtain the high-entanglement hydrogel electrolyte.
Comparative example 2:
1.89g of acrylamide is weighed and evenly mixed with 2mL of 0.01mol/L aqueous initiator solution. And (3) injecting the liquid into a glass die with a silica gel pad with the thickness of 2mm, sealing, and then placing the glass die into a 60 ℃ oven for reaction for 2.5 hours to obtain the hydrogel film with the comparison sample. The hydrogel film obtained above was immersed in 10% sodium chloride electrolyte for 48 hours to obtain a comparative hydrogel electrolyte.
The mass change before and after soaking in the electrolyte for examples 6-10 and comparative example 2 was regarded as electrolyte absorption rate, as shown in fig. 3. The zwitterionic substances added in the embodiment enable a large number of charged groups such as sulfonic acid groups, carboxylic acid groups, quaternary ammonium groups and the like to exist in the solution, and the charged groups are extremely easy to carry out solvation reaction with water, so that the absorption rate of the solution is improved. As can be seen from FIG. 3, the electrolyte absorption rate of the example is 3 to 4 times that of the comparative example.
As shown in fig. 4 to 6, the polymer gel electrolytes prepared in example 10 and comparative example 2 were applied to an aluminum-air battery, and power density, constant current discharge, and open circuit voltage were tested for this. As can be seen from fig. 4, the battery power measured in example 10 was much higher than that obtained in comparative example 2; fig. 5 illustrates that the cell discharge voltage obtained in example 10 is higher than that of comparative example 2 at different current densities; in the open circuit situation, the voltage obtained in comparative example 2 is also lower than that obtained in example 10. Therefore, the physical crosslinking hydrogel electrolyte prepared by the invention can improve the power density, open-circuit voltage and constant-current discharge voltage of the aluminum-air battery.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. The preparation method of the physical cross-linked hydrogel electrolyte mainly comprising entanglement is characterized by mainly comprising the following steps:
step 1: 1-2.5g of acrylamide is weighed and added into 2mL of initiator aqueous solution to be uniformly mixed;
step 2: adding 0.9-2.2g of [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide (hereinafter referred to as DMAPS) to the mixed solution obtained in the step 1, and then continuously adding 1.5g of betaine to stir and mix;
step 3: standing the mixed solution obtained in the step 2 for a period of time until bubbles disappear;
step 4: injecting the mixed liquid obtained in the step 3 into a mold, sealing the mold, putting the mold into a constant-temperature oven for crosslinking reaction, and finally obtaining a hydrogel film;
step 5: immersing the hydrogel film obtained in the step 4 into electrolyte for a period of time to obtain the hydrogel electrolyte.
2. The method for producing a entanglement-based physically crosslinked hydrogel electrolyte according to claim 1, characterized in that: the initiator in the step 1 is one or two of potassium persulfate and ammonium persulfate, and the concentration of the aqueous solution of the initiator is 0.01-0.05mol/L.
3. The method for producing a entanglement-based physically crosslinked hydrogel electrolyte according to claim 1, characterized in that: the betaine concentration in the step 2 is 0.5-1.5g/mL.
4. The method for producing a entanglement-based physically crosslinked hydrogel electrolyte according to claim 1, characterized in that: the temperature of the constant temperature oven in the step 4 is 55-65 ℃ and the reaction time is 2.5-4.5 h.
5. The method for producing a entanglement-based physically crosslinked hydrogel electrolyte according to claim 1, characterized in that: the soaking time of the hydrogel film in the electrolyte in the step 5 is 24-72 h.
6. The method for producing a entanglement-based physically crosslinked hydrogel electrolyte according to claim 1, characterized in that: the electrolyte in the step 5 can be sodium chloride or potassium hydroxide, wherein the sodium chloride is sodium chloride aqueous solution, and the mass percentage is 10%. The potassium hydroxide is aqueous solution of potassium hydroxide, and the concentration is 1-6mol/L.
7. Use of a entanglement-based physically cross-linked hydrogel electrolyte, characterized in that said entanglement-based physically cross-linked hydrogel electrolyte is used in a flexible aluminium-air battery.
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