CN112838262A - Preparation method of polyamide-based gel polymer electrolyte with multi-network structure - Google Patents
Preparation method of polyamide-based gel polymer electrolyte with multi-network structure Download PDFInfo
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
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- 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
- C08F122/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides or nitriles thereof
- C08F122/36—Amides or imides
- C08F122/38—Amides
- C08F122/385—Monomers containing two or more (meth)acrylamide groups, e.g. N,N'-methylenebisacrylamide
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
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- C08F126/02—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen by a single or double bond to nitrogen
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0085—Immobilising or gelification of electrolyte
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to a polyamide-based gel polymer electrolyte with a multi-network structure and a preparation method thereof; belongs to the technical field of high-performance battery development. The gel polymer electrolyte is formed by polymerizing an amido monomer material, and a hydrogen bond effect is formed between the amido monomer material and the porous supporting material. The preparation method comprises the following steps: the amido monomer material and the liquid electrolyte of the lithium ion battery are fully and uniformly mixed according to the design group distribution, and polymerized to form a film on the porous supporting material rich in hydroxyl and carboxyl, so as to obtain the interface enhanced polyamide-based gel polymer electrolyte with a multi-network structure and high strength. The gel polymer electrolyte has reasonable component design, simple and controllable preparation process, and excellent performance, and is convenient for large-scale industrial production.
Description
Technical Field
The invention designs a polyamide-based gel polymer electrolyte with a multi-network structure and a preparation method thereof; belongs to the technical field of high-performance battery development.
Background
Lithium ion battery secondary batteries have become the first choice energy storage technology in the fields of hybrid electric vehicles, portable electronic devices, and the like due to their high energy density. With the wide application of lithium ion batteries, the market has higher and higher requirements on the safety and light weight of the lithium ion batteries, and how to design a long cycle life, the lithium ion batteries with high safety performance become a hot problem in the research and development and application of the secondary batteries at present.
Most of the electrolytes of the lithium ion batteries which are commercially used at present are liquid electrolytes, and the risk of electrolyte leakage exists in the using process. Meanwhile, lithium ions are unevenly deposited on the negative electrode, lithium dendrite is easily formed, dead lithium is generated, active lithium is reduced, the cycle life of the battery is shortened, and even a diaphragm can be punctured to cause short circuit inside the battery, so that serious safety accidents are caused. The gel polymer electrolyte can avoid the leakage problem of the traditional liquid electrolyte, can be flexibly processed into any shape, and simultaneously keeps higher ionic conductivity and electrode compatibility.
However, the gel polymer electrolyte commonly used at present has the serious problems that the ionic conductivity is greatly reduced due to the addition of a large content of insulating polymer, and the electrode wettability is poor, so that the interface between a positive electrode and a negative electrode is deteriorated. Therefore, designing a gel-state polymer electrolyte which is safe and environment-friendly and simultaneously gives consideration to electrochemical performance is the focus of the current electrolyte research.
Disclosure of Invention
The invention aims to provide a multi-network structure gel polymer electrolyte of a lithium ion battery and a preparation method thereof.
The invention relates to a polyamide-based gel polymer electrolyte material with a multi-network structure; the raw materials used by the gel polymer electrolyte comprise an amide monomer material and a lithium salt; the amido monomer material can be polymerized to obtain a polymer, and a hydrogen bond effect is formed between the amido monomer material and the porous supporting material; the amido polymer is polymerized by at least one of N, N-methylene bisacrylamide, acrylamide, methacrylamide, N-allyl formamide, N-ethyl acrylamide, N-methyl-2-acrylamide, N-isopropyl acrylamide and N-ethyl-2-methacrylamide.
The invention relates to a polyamide-based gel polymer electrolyte material with a multi-network structure; the mass fraction of the amide-based polymer material is 1-50 wt%. Among them, the mass fraction of the amide-based polymer material is preferably 1 to 10 wt%, more preferably 1 to 5 wt%, and still more preferably 1 to 3 wt%.
The invention relates to a polyamide-based gel polymer electrolyte material with a multi-network structure; when the anode material of the lithium ion battery is LiNi0.6Co0.2Mn0.2O2When the current is over; the monomer of the polyamide-based polymer used is preferably N, N-methylenebisacrylamide. When the lithium ion battery positive electrode material is lithium iron phosphate, the amide organic monomer is preferably N-allyl formamide.
The invention relates to a polyamide-based gel polymer electrolyte material with a multi-network structure; the lithium salt is selected from at least one of lithium bistrifluoromethanesulfonylimide, lithium bisoxalato borate, lithium difluorooxalato borate, lithium hexafluorophosphate and lithium tetrafluoroborate. The lithium salt accounts for 80-95% of the total mass of the amide monomer material and the lithium salt.
The invention relates to a preparation method of a multi-network structure polyamide-based gel polymer electrolyte material, which comprises the following steps: uniformly mixing monomers of an organic material and lithium salt distributed according to a design group in an organic solvent, performing polymerization reaction and/or condensation reaction, and drying to obtain a positive electrode material of a modified lithium ion battery coated with a strong electronegative organic layer; the monomer of the organic material is selected from at least one of N, N-methylene bisacrylamide, acrylamide, methacrylamide, N-allyl formamide, N-ethyl acrylamide, N-methyl-2-acrylamide, N-isopropyl acrylamide and N-ethyl-2-methacrylamide; the lithium salt is selected from at least one of lithium bistrifluoromethanesulfonylimide, lithium bisoxalato borate, lithium difluorooxalato borate, lithium hexafluorophosphate and lithium tetrafluoroborate; the organic solvent is at least one selected from the group consisting of ethylene carbonate, diethyl carbonate, dimethyl carbonate, ethyl methyl carbonate, propionate carbonate, methyl formate, methyl acetate, methyl butyrate and ethyl propionate.
As a preferable scheme, the preparation method of the multi-network structure polyamide-based gel polymer electrolyte material comprises the following steps:
(1) preparing a precursor solution, namely dissolving a monomer material with an amide group in an electrolyte of a lithium ion battery in an environment with a protective atmosphere and with oxygen content and water content both less than 1ppm, fully stirring, and then adding a free radical initiator compound to obtain a precursor solution of the gel polymer electrolyte; the lithium ion battery electrolyte contains lithium ions;
(2) curing to form a film: in the process of injecting liquid into the lithium ion battery, dropwise adding the precursor solution obtained in the step (1) on a porous support material, directly assembling the porous support material into a battery, and then placing the assembled battery in an oven for in-situ thermal polymerization; or coating the precursor solution in the step (1) on a porous support material, carrying out thermal or photo-initiated polymerization to obtain a gel polymer electrolyte, and directly assembling the positive electrode, the negative electrode and the electrolyte into a battery.
The amide monomer material is composed of any one or more of N, N-methylene bisacrylamide, acrylamide, methacrylamide, N-allyl formamide, N-ethyl acrylamide, N-methyl-2-acrylamide, N-isopropyl acrylamide and N-ethyl-2-methacrylamide, wherein N, N-methylene bisacrylamide is preferred.
The mass fraction ratio of the amide-based monomer material to the gel polymer electrolyte is 1-50 wt%. Among them, the mass fraction of the amide-based monomer material is preferably 1 to 10 wt%, more preferably 2 to 5 wt%.
The lithium ion electrolyte solvent system is composed of any one or more of ethylene carbonate, diethyl carbonate, dimethyl carbonate, ethyl methyl carbonate, propionate carbonate, methyl formate, methyl acetate, methyl butyrate and ethyl propionate, wherein a mixed solvent of ethylene carbonate and ethyl methyl carbonate is preferred, and the ratio of ethylene carbonate to ethyl methyl carbonate is preferably 2: 3.
the initiator is at least one selected from azobisisobutyronitrile, cyclohexanone peroxide, azobisisoheptonitrile, tert-butyl hydroperoxide and dimethyl azobisisobutyrate, and azodiisobutyronitrile is more preferable.
The ratio of the mass of the radical initiator compound to the mass of the amide monomer material is 0.01 to 1 wt%, and more preferably 0.5 wt%.
The porous support material is selected from porous membranes consisting of single or multiple components of polyethylene, polypropylene, polyacrylonitrile, poly (vinylidene fluoride-hexafluoroethylene), polymethyl methacrylate, polyimide, polyetherimide, aramid and cellulose, and is further preferably cellulose and polyimide.
When the gel polymer electrolyte is subjected to polymerization reaction, the temperature is controlled to be 40-70 ℃, wherein the temperature is further optimized to be 50-60 ℃.
In the invention, when the lithium ion battery anode material is LiNi0.6Co0.2Mn0.2O2And when the preferred acylamino organic monomer is N, N-methylene bisacrylamide, the capacity retention rate of the obtained product is 82-87% after 800 charge-discharge cycles under 1C.
In the invention, when the lithium ion battery anode material is lithium iron phosphate, the lithium sheet is used as a cathode, and the used amido organic monomer is preferably N-allylformamide, the capacity retention rate of the obtained product is 85-86% after the product is subjected to 1000 charge-discharge cycles under 1C.
The invention utilizes the double bond polymerization of amide organic monomer to form a network, and constructs a multiple polymer network structure through the hydrogen bond action between the hydroxyl groups in the amide groups and the hydroxyl groups, carboxyl groups and other groups on the diaphragm, thereby realizing the solidification of the liquid electrolyte by a small proportion of polymer matrix, which is essentially different from the prior patent.
The invention has the advantages that: the invention provides a preparation method of a polyamide-based gel polymer electrolyte, which is mainly characterized in that a polymer network structure is formed after an amide-containing organic monomer is polymerized, meanwhile, hydrogen bonding action can be formed among hydroxyl groups on amide groups, the stability of the polymer network structure is enhanced, and the crosslinking degree of the whole polymer network structure is further enhanced through the hydrogen bonding action of the amide groups on the polymer and rich functional groups such as hydroxyl groups, carboxyl groups and the like on a diaphragm. The formation of the triple cross-linked network structure ensures the solidification of the liquid phase component of the polymer electrolyte, realizes the locking of the high-content liquid phase component with low polymer proportion, and obtains good performance superior to the liquid electrolyte. The obtained gel polymer electrolyte with the multi-network structure has high ionic conductivity close to liquid electrolyte, improves the mobility of lithium ions, and solves the problems of large contact resistance between the polymer electrolyte and a positive electrode and poor compatibility of a contact interface. The introduced amide monomer can generate abundant nitride on the negative electrode side to form an organic-inorganic composite interface film, which is beneficial to the rapid transmission and uniform deposition of lithium ions, and meanwhile, the high oxidation resistance of polyamide molecules can ensure the stability of the electrolyte under the high voltage of the positive electrode side. The preparation process of the gel polymer electrolyte is simple, the operation is simple and convenient, the polymer material consumption is less, and the cost is low.
Drawings
FIG. 1 is a graph showing the test results of the transference number of lithium ions between liquid and gel polymer electrolytes in example 1;
FIG. 2 shows LiNi, a liquid and gel polymer electrolyte in example 20.6Co0.2Mn0.2O2A plot of electrochemical performance of the/Li cell;
FIG. 3 is a graph showing the measurement of the lithium ion mobility of the liquid electrolyte in example 3;
fig. 4 is a lithium ion mobility test chart of the amide-based gel polymer electrolyte in example 3.
Detailed Description
Example 1
Accurately weighing 0.06g of N, N-methylene bisacrylamide, and dissolving the N, N-methylene bisacrylamide in the ethylene carbonate and methyl ethyl carbonate according to the proportion of 2: 3, the lithium salt is lithium bis (trifluoromethanesulfonylimide) (the dosage of the lithium bis (trifluoromethanesulfonylimide) is 0.397g), the dosage of the electrolyte is 1.94g, after stirring for 10min under the argon protective atmosphere, 0.001g of azobisisobutyronitrile initiator is added into the mixed solution, and the stirring is continued to obtain the precursor solution of the gel polymer electrolyte.
In a glove box protected by argon and having water content and oxygen content less than 1ppm, the prepared precursor solution is injected into a porous cellulose membrane, two stainless steel sheets are selected as blocking electrodes to assemble a button cell, and then the cell is heated at 60 ℃ for 4h to carry out in-situ polymerization. The assembled stainless steel sheet symmetrical battery is subjected to impedance spectrum test by adopting an electrochemical workstation, and the battery assembled by adopting the same electrolyte is used as a comparison, and the conductivity of the battery is 2.72 multiplied by 10-3S/cm, and a lithium ion conductivity of 2.36X 10 as measured with a gel polymer electrolyte-3S/cm。
Example 2
LiNi is selected0.6Co0.2Mn0.2O2The ternary material is used as a positive electrode, a lithium sheet is used as a negative electrode, the precursor solution in the embodiment 1 is injected into a porous cellulose membrane in a glove box which is protected by argon and has the water content and the oxygen content of less than 1ppm to assemble the ternary material/lithium metal battery, and then the battery is heated at 60 ℃ for 4 hours to carry out in-situ polymerization to obtain the gel polymer electrolyte battery. For comparison, the same organic electrolyte is adopted to assemble the liquid ternary material/lithium metal battery, the two assembled ternary material/lithium metal batteries are subjected to constant current charge-discharge test at a rate of 1C, the test voltage interval is 3.0-4.3V, the measured initial discharge specific capacity of the gel ternary material/lithium metal battery is 155.2mAh/g, the stable circulation can be carried out for 800 circles, the capacity retention rate is 86%, the initial discharge specific capacity of the assembled liquid lithium ion battery is 154.2mAh/g, the capacity retention rate is only 62% after 600 circles of circulation, and the capacity attenuation amplitude is obviously increased after the circulation.
Embodiment 3
Accurately weighing 0.09g of N-allylformamide, wherein the proportion of N-allylformamide dissolved in ethylene carbonate and dimethyl carbonate is 1: 1, the lithium salt is bis (trifluoromethane sulfonyl) imide lithium (the dosage of the bis (trifluoromethane sulfonyl) imide lithium is 0.596g), the dosage of the electrolyte is 2.91g, after stirring for 10min under the argon protective atmosphere, 0.001g of azodiisobutyronitrile initiator is added into the mixed solution, and the stirring is continued to obtain the precursor solution of the gel polymer electrolyte.
In a glove box protected by argon and having water content and oxygen content less than 1ppm, the prepared precursor solution is injected into a porous cellulose membrane, two lithium sheets are selected to assemble a symmetrical battery, and then the battery is heated at 60 ℃ for 4h to carry out in-situ polymerization. And (3) performing steady-state current polarization test and impedance spectrum test before and after polarization on the assembled lithium symmetrical battery by using an electrochemical workstation, and measuring that the transference number of the lithium ions is 0.50. The transference number of lithium ions measured for a lithium symmetrical cell assembled with the same electrolyte was 0.26.
Example 4
And (2) selecting lithium iron phosphate as a positive electrode, selecting a lithium sheet as a negative electrode, injecting the precursor solution in the embodiment 3 into a porous cellulose membrane in a glove box protected by argon and having the water content and the oxygen content of less than 1ppm to assemble a lithium iron phosphate/lithium metal battery, and then heating the battery at 60 ℃ for 4 hours to perform in-situ polymerization to obtain the gel polymer electrolyte battery. For comparison, the same organic electrolyte is adopted to assemble the liquid lithium iron phosphate/lithium metal battery, the two assembled lithium iron phosphate/lithium metal batteries are subjected to constant current charge and discharge test under the multiplying power of 1C, the test voltage interval is 2.8-4.0V, the measured initial discharge specific capacity of the gel lithium iron phosphate/lithium metal battery is 143.2mAh/g, the gel lithium iron phosphate/lithium metal battery can be stably circulated for 1000 circles, the capacity retention rate is 85%, the initial discharge specific capacity of the assembled liquid lithium ion battery is 146mAh/g, and the capacity retention rate is only 68% after 1000 circles of circulation.
Example 5
Selecting a chemical formula as Li1.2(Mn0.526Ni0.421Co0.053)O2The lithium-manganese-rich anode material is used as an anode, a lithium sheet is used as a cathode, the precursor solution in the embodiment 3 is injected into a porous cellulose membrane in a glove box which is protected by argon and has the water content and the oxygen content of less than 1ppm to assemble a lithium-manganese-rich/lithium metal battery, and then the battery is heated at 60 ℃ for 4 hours to carry out in-situ polymerization to obtain the gel polymer electrolyte battery. By way of contrast, the same organic electrolyte was used to assemble the liquid concentrateThe lithium manganese/lithium metal battery is characterized in that the two assembled lithium manganese/lithium metal batteries are subjected to constant current charge-discharge test at a rate of 1C, the test voltage interval is 2.0-4.7V, the measured initial discharge specific capacity of the gel lithium manganese/lithium metal battery is 198.2mAh/g, the gel lithium manganese/lithium metal battery can be stably circulated for 300 circles, the capacity retention rate is 75%, the initial discharge specific capacity of the assembled liquid lithium ion battery is 201.2mAh/g, and the capacity retention rate is only 58% after the gel lithium manganese/lithium metal battery is circulated for 300 circles.
Claims (10)
1. A multi-network structure polyamide-based gel polymer electrolyte material; the method is characterized in that: the raw materials used by the gel polymer electrolyte comprise an amide monomer material and a lithium salt; the amido monomer material can be polymerized to obtain a polymer, and a hydrogen bond effect is formed between the amido monomer material and the porous supporting material; the amido polymer is polymerized by at least one of N, N-methylene bisacrylamide, acrylamide, methacrylamide, N-allyl formamide, N-ethyl acrylamide, N-methyl-2-acrylamide, N-isopropyl acrylamide and N-ethyl-2-methacrylamide.
2. A multi-network structure polyamide-based gel polymer electrolyte material according to claim 1; the method is characterized in that: the mass fraction of the amide-based polymer material is 1-50 wt%. Among them, the mass fraction of the amide-based polymer material is preferably 1 to 10 wt%, more preferably 1 to 5 wt%, and still more preferably 1 to 3 wt%.
3. A multi-network structure polyamide-based gel polymer electrolyte material according to claim 1; the method is characterized in that: when the anode material of the lithium ion battery is LiNi0.6Co0.2Mn0.2O2When the current is over; the monomer of the polyamide-based polymer used is preferably N, N-methylenebisacrylamide; when the lithium ion battery positive electrode material is lithium iron phosphate, the amide organic monomer is preferably N-allyl formamide.
4. A multi-network structure polyamide-based gel polymer electrolyte material according to claim 1; the method is characterized in that: the lithium salt is selected from at least one of lithium bistrifluoromethanesulfonylimide, lithium bisoxalato borate, lithium difluorooxalato borate, lithium hexafluorophosphate and lithium tetrafluoroborate. The lithium salt accounts for 80-95% of the total mass of the amide monomer material and the lithium salt.
5. A preparation method of a multi-network structure polyamide-based gel polymer electrolyte material comprises the following steps: uniformly mixing an organic monomer and a lithium salt which are distributed and taken according to a design group in an organic solvent, and drying the mixture after polymerization reaction and/or condensation reaction to obtain a modified lithium ion battery anode material coated with a strong electronegative organic layer; the organic monomer is selected from at least one of N, N-methylene bisacrylamide, acrylamide, methacrylamide, N-allyl formamide, N-ethyl acrylamide, N-methyl-2-acrylamide, N-isopropyl acrylamide and N-ethyl-2-methacrylamide; the lithium salt is selected from at least one of lithium bistrifluoromethanesulfonylimide, lithium bisoxalato borate, lithium difluorooxalato borate, lithium hexafluorophosphate and lithium tetrafluoroborate; the organic solvent is at least one selected from the group consisting of ethylene carbonate, diethyl carbonate, dimethyl carbonate, ethyl methyl carbonate, propionate carbonate, methyl formate, methyl acetate, methyl butyrate and ethyl propionate.
6. The method for preparing the multi-network structure polyamide-based gel polymer electrolyte material according to claim 5, wherein the method comprises the following steps:
(1) preparing a precursor solution, namely dissolving a monomer material with an amide group in an electrolyte of a lithium ion battery in an environment with a protective atmosphere and with oxygen content and water content both less than 1ppm, fully stirring, and then adding a free radical initiator compound to obtain a precursor solution of the gel polymer electrolyte; the lithium ion battery electrolyte contains lithium ions;
(2) curing to form a film: in the process of injecting liquid into the lithium ion battery, dropwise adding the precursor solution obtained in the step (1) on a porous support material, directly assembling the porous support material into a battery, and then placing the assembled battery in an oven for in-situ thermal polymerization; or coating the precursor solution in the step (1) on a porous support material, carrying out thermal or photo-initiated polymerization to obtain a gel polymer electrolyte, and directly assembling the positive electrode, the negative electrode and the electrolyte into a battery.
7. The method for preparing the multi-network structure polyamide-based gel polymer electrolyte material according to claim 5, wherein: the mass fraction ratio of the amide-based monomer material to the gel polymer electrolyte is 1-50 wt%. Among them, the mass fraction of the amide-based monomer material is preferably 1 to 10 wt%, more preferably 2 to 5 wt%.
8. The method for preparing the multi-network structure polyamide-based gel polymer electrolyte material according to claim 5, wherein:
the lithium ion electrolyte solvent system is composed of any one or more of ethylene carbonate, diethyl carbonate, dimethyl carbonate, ethyl methyl carbonate, propionate carbonate, methyl formate, methyl acetate, methyl butyrate and ethyl propionate, wherein a mixed solvent of ethylene carbonate and ethyl methyl carbonate is preferred, and the ratio of ethylene carbonate to ethyl methyl carbonate is preferably 2: 3;
the initiator is selected from at least one of azobisisobutyronitrile, cyclohexanone peroxide, azobisisoheptonitrile, tert-butyl hydroperoxide and dimethyl azobisisobutyrate, and is further preferably azobisisobutyronitrile;
the mass of the free radical initiator compound and the proportion of the amido monomer material are 0.01-1 wt%, and the preferable proportion is 0.5 wt%;
the porous support material is selected from porous membranes consisting of single or multiple components of polyethylene, polypropylene, polyacrylonitrile, poly (vinylidene fluoride-hexafluoroethylene), polymethyl methacrylate, polyimide, polyetherimide, aramid and cellulose, and is further preferably cellulose and polyimide.
9. The method for preparing the multi-network structure polyamide-based gel polymer electrolyte material according to claim 5, wherein: when the gel polymer electrolyte is subjected to polymerization reaction, the temperature is controlled to be 40-70 ℃, wherein the temperature is further optimized to be 50-60 ℃.
10. The method for preparing a multi-network structure polyamide-based gel polymer electrolyte material according to any one of claims 5 to 9, wherein: when the anode material of the lithium ion battery is LiNi0.6Co0.2Mn0.2O2When the amide organic monomer is N, N-methylene bisacrylamide, and the obtained product has a capacity retention rate of 82-87% after 800 charge-discharge cycles at 1C;
when the lithium ion battery anode material is lithium iron phosphate, the lithium sheet is used as a cathode, and the used amido organic monomer is preferably N-allylformamide, the capacity retention rate of the obtained product is 85-86% after the product is subjected to 1000 charge-discharge cycles under 1C.
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| CN113072100A (en) * | 2021-03-26 | 2021-07-06 | 天津市捷威动力工业有限公司 | Preparation method of high-nickel lithium ion battery positive electrode material |
| CN113540574A (en) * | 2021-06-24 | 2021-10-22 | 西安交通大学 | Lithium battery assembly process for heating in-situ solidified electrolyte |
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| CN115377489A (en) * | 2022-10-11 | 2022-11-22 | 中国人民解放军军事科学院防化研究院 | Preparation method of wide-temperature-range electrolyte for lithium ion battery |
| CN116072963A (en) * | 2022-05-06 | 2023-05-05 | 齐齐哈尔大学 | Preparation method of biomass-derived carbon/polymer gel electrolyte and application of biomass-derived carbon/polymer gel electrolyte in sodium-sulfur battery |
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