An ultraviolet light-cured fluorinated nitrided solid-state lithium battery polymer electrolyte and a preparation method thereof
Fluorinated and nitrided polymer electrolytes for solid-state lithium batteries were prepared by UV curing fluorination and nitridation strategy, which solved the problems of low ionic conductivity and poor interfacial contact of polymer solid electrolytes, and achieved efficient and environmentally friendly electrolyte preparation and improved battery stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SOUTH CHINA UNIV OF TECH
- Filing Date
- 2023-07-17
- Publication Date
- 2026-07-14
AI Technical Summary
Existing polymer solid electrolytes suffer from problems such as low room temperature ionic conductivity, narrow electrochemical window, and poor interfacial contact. Furthermore, traditional preparation methods are inefficient and unsuitable for large-scale production.
A fluorinated nitriding strategy with UV curing was adopted to prepare a polymer electrolyte for solid-state lithium batteries by mixing fluorinated acrylate monomers, multifunctional amide monomers and lithium salt electrolytes, thereby generating a stable electrode/electrolyte interface and promoting lithium-ion transport.
It improves the ionic conductivity and electrochemical stability of polymer electrolytes, and the preparation method is environmentally friendly and efficient, suitable for roll-to-roll continuous production, and has potential for industrial applications.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of lithium battery electrolytes, specifically to a UV-curable fluorinated nitride solid-state lithium battery polymer electrolyte and its preparation method. Background Technology
[0002] In recent years, with the continuous development of mobile devices and electric vehicles, the demand for high-performance, high-safety, and high-stability batteries has been increasing. Among them, lithium-ion batteries have become one of the most widely used battery types due to their many significant advantages, such as long service life, high efficiency, and no memory effect. However, the liquid electrolyte in lithium-ion batteries uses a large amount of volatile and flammable ether or carbonate solvents, posing a significant safety risk. When the battery operating temperature rises, is overcharged, short-circuited, or is squeezed, it is prone to thermal runaway, leading to combustion or explosion, causing great safety hazards and limiting the application of lithium batteries.
[0003] Compared to liquid electrolytes, solid-state electrolytes avoid the use of large amounts of organic solvents, thus offering advantages such as reduced leakage and volatilization, and reduced risk of internal short circuits. Therefore, solid-state electrolytes are safer for lithium-ion battery applications. Currently, solid-state electrolytes can be divided into two categories: organic polymer solid-state electrolytes and inorganic solid-state electrolytes. Among them, polymer solid-state electrolytes, with their good flexibility and strong processability, possess potential for industrial production and have therefore received widespread attention and research.
[0004] However, most polymer solid electrolytes suffer from low room-temperature ionic conductivity, narrow electrochemical windows, and poor interfacial contact, which limits their application. Furthermore, current methods for preparing solid polymers are often based on solution casting and thermal polymerization. The former involves the evaporation of large amounts of solvent to obtain the electrolyte membrane, posing serious environmental problems and resulting in long preparation times and low efficiency. The latter mostly involves single-cell thermal polymerization, which is unsuitable for large-scale electrolyte production. These shortcomings all restrict the development and large-scale application of polymer electrolytes.
[0005] Therefore, designing a polymer electrolyte with high ionic conductivity at room temperature, a wide electrochemical window, good contact with the electrode interface, and scalable preparation is of great significance. This invention employs a fluorination-nitridation strategy to construct a polymer electrolyte with high ionic conductivity and high voltage resistance at room temperature. This electrolyte promotes rapid lithium-ion transport at the interface and enhances battery cycle stability by generating a fluorinated-nitrided electrode / electrolyte interface. Furthermore, unlike traditional methods for preparing polymer electrolytes, this invention is simple, rapid, and efficient, possessing the potential for large-scale preparation and application. Summary of the Invention
[0006] In order to overcome the shortcomings and deficiencies of the prior art, the present invention aims to provide a UV-curable polymer electrolyte for fluorinated nitride solid lithium batteries and its preparation method.
[0007] The objective of this invention is achieved through the following technical solution:
[0008] A method for preparing a UV-curable fluorinated nitride solid-state lithium battery polymer electrolyte includes the following steps:
[0009] 1) Mix the fluorinated acrylate monomer and the photoinitiator to obtain a mixture;
[0010] 2) Under a protective atmosphere, the mixture from step 1) is photopolymerized to obtain a prepolymerized slurry;
[0011] 3) Mix the prepolymer slurry with the multifunctional amide monomer, lithium salt electrolyte, and photoinitiator to obtain a mixed slurry;
[0012] 4) The mixed slurry is coated onto the support material and photopolymerized and cured to obtain a fluorinated and nitrided solid-state lithium battery polymer electrolyte membrane.
[0013] Step 1) The fluorinated acrylate monomer is an acrylate monomer with a monofunctional group and a fluorinated side chain; the fluorinated acrylate monomer may be selected from one or more of (meth)acrylate trifluoroethyl acrylate, (meth)acrylate tetrafluoropropyl acrylate, (meth)acrylate hexafluorobutyl acrylate, (meth)acrylate octafluoropentyl acrylate, (meth)acrylate tridecylfluorooctyl acrylate and (meth)acrylate heptadecafluorodecyl acrylate.
[0014] The photoinitiator described in steps 1) and 3) is selected from one or more of hydrogen-abstracting or cleavage-type free radical ultraviolet photoinitiators, such as diphenylethylene glycol, dialkoxyacetophenone, α-hydroxyalkylacetophenone, methyl benzoylformate, 2,4-diethylthionone, 2-hydroxy-2-methylphenylpropane-1-one, 2-hydrothionone, and α,α'-ethoxyacetophenone.
[0015] Step 1) refers to mixing at a constant temperature of 20℃~40℃.
[0016] In step 2), the viscosity of the prepolymer slurry obtained by photopolymerization is 300 cP to 10000 cP.
[0017] Step 2) When performing ultraviolet light polymerization, the energy of ultraviolet irradiation is 500-5000 mJ.
[0018] Step 3) The number of double bond functional groups of the multifunctional amide monomer is ≥2, and the multifunctional amide monomer is selected from one or more of N,N′-methylenebisacrylamide, ethylenediaminebisacrylamide, propylenediaminebisacrylamide, butanediaminebisacrylamide, and N,N′-ethylenebisacrylamide.
[0019] Step 3) The lithium salt electrolyte is selected from one or more of lithium perchlorate, lithium tetrafluoroborate, lithium hexafluoroarsenate, lithium hexafluorophosphate, lithium bis(oxalate)borate, lithium difluorooxalateborate, lithium bis(difluorosulfonyl)imide, and lithium bis(trifluoromethylsulfonyl)imide.
[0020] Step 4) The thickness of the electrolyte membrane formed by coating the slurry onto the support material is 10 μm to 1000 μm. Step 4) The light curing is ultraviolet light curing, and the curing energy of ultraviolet light curing is 500 mJ to 5000 mJ.
[0021] In the above method for preparing polymer electrolytes for fluorinated nitride solid-state lithium batteries, the proportions of each raw material are as follows: 0.5–100 parts by mass of fluorinated acrylate monomer, 0.111–11.1 parts by mass of polyfunctional amide monomer, 0.01–2 parts by mass of photoinitiator, and 3.7–370 parts by mass of lithium salt electrolyte. In step 1), the amount of photoinitiator is 0.0005–0.1 parts by mass, and in step 3), the amount of photoinitiator is 0.0095–1.9 parts by mass.
[0022] Preferably, the fluorinated acrylate monomer comprises 0.5–10 parts by weight, the polyfunctional amide monomer comprises 0.111–1.11 parts by weight, the photoinitiator comprises 0.02–0.2 parts by weight, and the lithium salt electrolyte comprises 3.7–37 parts by weight. In step 1), the amount of photoinitiator is 0.0005–0.01 parts by weight, and in step 3), the amount of photoinitiator is 0.0095–0.19 parts by weight.
[0023] The present invention also provides a UV-curable polymer electrolyte for fluorinated nitride solid lithium batteries, which is prepared by the above method.
[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0025] (1) The polymer solid electrolyte for fluorinated and nitrided solid lithium batteries prepared by the present invention has high ionic conductivity, contains strong electron-withdrawing groups, has good high voltage resistance, and generates stable electrodes / electrolytes, which promotes uniform lithium ion transport and exhibits good electrochemical stability in full battery applications.
[0026] (2) The preparation method of the present invention is based on an environmentally friendly ultraviolet curing system, with no harmful gas emissions. The polymerization reaction is efficient and fast, and it is suitable for roll-to-roll continuous coating production process, with broad industrial application prospects. Attached Figure Description
[0027] Figure 1 The lithium-to-lithium symmetric battery assembled with a polymer electrolyte for the fluorinated nitride solid-state lithium battery obtained in Example 1 operates at 0.1 mA cm⁻¹. -2 and 0.1mAh cm -2 The constant current charge-discharge curve is shown below.
[0028] Figure 2 The graph shows the cycle performance of the NCM622 assembled with polymer electrolyte for the fluorinated nitride solid lithium battery obtained in Example 1 at 0.5C.
[0029] Figure 3 The graph shows the cycle performance of the NCM622 assembled with polymer electrolyte for the fluorinated nitride solid lithium battery obtained in Example 2 at 0.5C.
[0030] Figure 4 The lithium-to-lithium symmetric battery assembled with a polymer electrolyte for the fluorinated nitride solid-state lithium battery obtained in Example 3 was tested at 0.5 mA cm⁻¹. -2 and 0.5mAh cm -2 The constant current charge-discharge curve is shown below.
[0031] Figure 5 The graph shows the cycle performance of the NCM622 full cell assembled with polymer electrolyte for the fluorinated nitride solid lithium battery obtained in Example 3 at 0.5C.
[0032] Figure 6 The graph shows the cycle performance of the NCM622 full cell assembled with polymer electrolyte for the fluorinated nitride solid lithium battery obtained in Example 3 at 1C.
[0033] Figure 7 For Comparative Example 1, a lithium-to-lithium symmetric battery assembled with liquid electrolyte was tested at 0.5 mA cm⁻¹. -2 and 0.5mAh cm -2 The constant current charge-discharge curve is shown below.
[0034] Figure 8 The graph shows the cycle performance of the NCM622 full cell assembled with liquid electrolyte for Comparative Example 1 at 0.5C.
[0035] Figure 9 XPS characterization of the lithium metal anode after 100 cycles of NCM622 full cells using Example 3 and Comparative Example 1 as electrolytes, respectively.
[0036] Figure 10 The graph shows the cycle performance of the NCM622 full cell assembled with polymer electrolyte for the fluorinated solid lithium battery obtained in Comparative Example 2 at 0.5C.
[0037] Figure 11 The graph shows the cycle performance of the NCM622 full cell assembled with polymer electrolyte for the fluorinated nitride solid lithium battery obtained in Comparative Example 3 at 0.5C. Detailed Implementation
[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in further detail below. However, this should not be construed as limiting the scope of the invention to the following examples. Various substitutions or modifications made based on ordinary technical knowledge and conventional methods in the art without departing from the above-described methodological spirit of this invention should be included within the scope of this invention.
[0039] Example 1
[0040] The preparation method of UV-curable fluorinated nitride polymer electrolyte is as follows:
[0041] The first step involved mixing 90g of hexafluorobutyl acrylate and 0.1g of photoinitiator 2,2-dimethoxy-1,2-diphenyl ethyl ketone at a constant temperature of 25°C until homogeneous. Immediately afterward, the mixture was irradiated with a UV lamp under a nitrogen atmosphere to obtain a partially polymerized polymer slurry with a viscosity of approximately 3000 cP. The second step involved mixing 1g of this slurry with 0.111g of N,N′-methylenebisacrylamide and 3.7g of lithium salt electrolyte (LiTFSI and LiBOB, mass ratio 2:1). Then, 0.02g of the aforementioned photoinitiator was added and the mixture was stirred until homogeneous. The slurry was then evenly coated onto a cellulose membrane using a scraper and cured under UV light (curing time was 5 min). The final electrolyte membrane thickness was approximately 35 μm.
[0042] Example 2
[0043] The UV-curable fluorinated nitride polymer electrolyte is prepared by the following method:
[0044] The first step involved adding 90g of trifluoroethyl methacrylate and 0.1g of photoinitiator 2,2-dimethoxy-1,2-diphenyl ethyl ketone to a flask and stirring at a constant temperature of 25°C until homogeneous. Immediately afterwards, the mixture was irradiated with a UV lamp under a nitrogen atmosphere to obtain a partially polymerized polymer slurry with a viscosity of approximately 3000 cP. The second step involved taking 1g of this slurry and mixing it with 0.111g of N,N′-methylenebisacrylamide and 3.7g of lithium salt electrolyte (LiTFSI and LiBOB, mass ratio 2:1). Then, 0.02g of the aforementioned photoinitiator was added and stirred until homogeneous. The slurry was then evenly coated onto a cellulose membrane using a spatula and cured under UV light, resulting in an electrolyte membrane with a final thickness of approximately 35μm.
[0045] Example 3
[0046] The UV-curable fluorinated nitride polymer electrolyte is prepared by the following method:
[0047] The first step involved adding 90g of octafluoroamyl acrylate and 0.1g of photoinitiator 2,2-dimethoxy-1,2-diphenyl ethyl ketone to a flask and stirring at a constant temperature of 25°C until homogeneous. Immediately afterwards, the mixture was irradiated with a UV lamp under a nitrogen atmosphere to obtain a partially polymerized polymer slurry with a viscosity of approximately 3000 cP. The second step involved taking 1g of this slurry and mixing it with 0.111g of N,N′-methylenebisacrylamide and 3.7g of lithium salt electrolyte (LiTFSI and LiBOB, mass ratio 2:1). Then, 0.02g of the aforementioned photoinitiator was added and stirred until homogeneous. The slurry was then evenly coated onto a PP membrane (model Celgard 2500) using a doctor blade and cured under UV light, resulting in an electrolyte membrane with a final thickness of approximately 35μm.
[0048] Comparative Example 1
[0049] Commercial electrolyte is used as the electrolyte, and PP membrane (model Celgard 2500) is used as the battery separator.
[0050] Comparative Example 2
[0051] The UV-curable fluorinated polymer electrolyte is prepared by the following method:
[0052] The first step involved adding 90g of trifluoroethyl methacrylate and 0.1g of photoinitiator 2,2-dimethoxy-1,2-diphenyl ethyl ketone to a flask and stirring at a constant temperature of 25°C until homogeneous. Immediately afterwards, the mixture was irradiated with a UV lamp under a nitrogen atmosphere to obtain a partially polymerized polymer slurry with a viscosity of approximately 3000 cP. The second step involved mixing 1g of this slurry with 3.7g of lithium-ion battery electrolyte (lithium salts LiTFSI and LiBOB), then adding 0.02g of the aforementioned photoinitiator and stirring until homogeneous. The slurry was then evenly coated onto a PP membrane using a doctor blade and cured under UV light, resulting in an electrolyte membrane with a final thickness of approximately 35μm.
[0053] Comparative Example 3
[0054] The UV-curable fluorinated nitride polymer electrolyte is prepared by the following method:
[0055] The first step involved adding 90g of trifluoroethyl methacrylate and 0.1g of photoinitiator 2,2-dimethoxy-1,2-diphenyl ethyl ketone to a flask and stirring at a constant temperature of 25°C until homogeneous. Immediately afterwards, the mixture was irradiated with a UV lamp under a nitrogen atmosphere to obtain a partially polymerized polymer slurry with a viscosity of approximately 3000 cP. The second step involved mixing 1g of this slurry with 2g of N,N′-methylenebisacrylamide and 3.7g of lithium-ion battery electrolyte (lithium salts LiTFSI and LiBOB), then adding 0.02g of the aforementioned photoinitiator and stirring until homogeneous. The slurry was then evenly coated onto a cellulose membrane using a spatula and cured under UV light, resulting in an electrolyte membrane with a final thickness of approximately 35μm.
[0056] Performance testing:
[0057] The electrolytes described in Examples 1-3 and Comparative Examples 1-3 were used to assemble batteries.
[0058] Preparation of high-nickel ternary cathode (NCM622) electrode: Weigh 180 mg of binder polyvinylidene fluoride (PVDF), add 2.5 mL of N-methylpyrrolidone (NMP), and stir for 1 h to completely dissolve the PVDF; then add 180 mg of conductive agent SuperP and stir for 1 h; then add 1440 mg of NCM622 powder, and add NMP dropwise to adjust the viscosity of the slurry to 1000 cP to 3000 cP, and stir for another 3 h. Use a 150 μm doctor blade to uniformly coat the slurry onto carbon-coated aluminum foil, then place it in a vacuum drying oven at 80 °C for 12 h to remove the NMP solvent. Next, use a die-cutting machine to form circular electrode sheets with a diameter of 8 mm, and store them in a glove box to prevent moisture absorption. The active material content of this cathode is 80% by mass, with an active material loading of 1.5-2 mg / cm³ on each electrode sheet. -2 .
[0059] All button cell assembly was performed in an argon-protected glove box. The battery model used was CR2016, and the lithium sheet thickness was 250 μm. When assembling lithium-to-lithium symmetric batteries, for Examples 1-3, the positive electrode battery case, lithium sheet, polymer electrolyte membrane, lithium sheet, and negative electrode battery case were stacked sequentially, followed by sealing in a battery sealing machine. For Comparative Example 1, the positive electrode battery case, lithium sheet, and PP separator were stacked sequentially, liquid electrolyte was added to fully wet the separator, followed by stacking the lithium sheet and negative electrode battery case, and sealing in a battery sealing machine. When assembling NCM622 full cells, for Examples 1-3, the positive electrode battery case, positive electrode sheet, polymer electrolyte membrane, lithium sheet, and negative electrode battery case were stacked sequentially, followed by sealing in a battery sealing machine. For Comparative Example 1, the positive electrode battery case, positive electrode sheet, and PP separator were stacked sequentially, liquid electrolyte was added to wet the separator, followed by stacking the lithium sheet and negative electrode battery case, and sealing in a battery sealing machine.
[0060] Performance comparison and effect evaluation:
[0061] Battery charge / discharge test: A Blue Battery testing system (model CT2001A) was used. The sealed, assembled batteries were placed in a 27°C constant temperature chamber and tested using the Blue Battery charge / discharge tester. For NCM622 full batteries, the charge / discharge voltage range was 2.8–4.3V. The results and analysis are as follows:
[0062] Figure 1 The lithium-to-lithium symmetric battery assembled with a polymer electrolyte for the fluorinated nitride solid-state lithium battery obtained in Example 1 operates at 0.1 mA cm⁻¹. -2 and 0.1mAh cm -2 The constant current charge-discharge curve of this battery at 0.1 mA cm⁻¹ is shown. -2 Current density and 0.1 mAh cm⁻¹ -2 It can cycle stably for more than 700 hours at its capacity and has a small overpotential of about 50mV.
[0063] Figure 2 The graph shows the cycling performance of the NCM622 assembled with polymer electrolyte for the fluorinated nitride solid lithium battery obtained in Example 1 at 0.5C. This full cell can stably cycle 100 times at a cutoff voltage of 4.3V and a current density of 0.5C, and has a high capacity retention of 93.5%.
[0064] Figure 3 The graph shows the cycling performance of the NCM622 assembled with polymer electrolyte for the fluorinated nitride solid lithium battery obtained in Example 2 at 0.5C. The full cell can stably cycle 100 times at a cutoff voltage of 4.3V and a current density of 0.5C, and has a high capacity retention of 89.4% and an average coulombic efficiency of 99.7%.
[0065] Figure 4 The lithium-to-lithium symmetric battery assembled with a polymer electrolyte for the fluorinated nitride solid-state lithium battery obtained in Example 3 was tested at 0.5 mA cm⁻¹. -2 and 0.5mAh cm -2 The constant current charge-discharge curves below show that the battery can cycle stably for over 700 hours.
[0066] Figure 5 The graph shows the cycling performance of the NCM622 full cell assembled with polymer electrolyte for the fluorinated nitride solid lithium battery obtained in Example 3 at 0.5C. After 700 cycles at 0.5C, the capacity retention rate of the battery is 83.9%, and the average coulombic efficiency reaches 99.9%.
[0067] Figure 6The graph shows the cycling performance of the NCM622 full cell assembled with polymer electrolyte for the fluorinated nitride solid lithium battery obtained in Example 3 at 1C. After 700 cycles at 1C, the capacity retention rate of the battery is 82.5%, and the average coulombic efficiency is 99.9%.
[0068] Figure 7 For Comparative Example 1, a lithium-to-lithium symmetric battery assembled with liquid electrolyte was tested at 0.5 mA cm⁻¹. -2 and 0.5mAh cm -2 The constant current charge-discharge curve below shows that the battery is unstable in charge-discharge, has a large polarization potential of about 100mV, and fails after about 150 hours.
[0069] Figure 8 The graph shows the cycling performance of the NCM622 full cell assembled with liquid electrolyte in Comparative Example 1 at 0.5C. The capacity retention of this cell is 53.8% after 550 cycles at a current density of 0.5C.
[0070] Figure 9 XPS characterization was performed on the lithium metal anodes of NCM622 full cells using Example 3 and Comparative Example 1 as electrolytes after 100 cycles. It can be seen that with increasing etching time, the peak intensities of lithium fluoride (LiF) and lithium nitride (Li3N) on the lithium metal anode of Example 3 are greater than those of Comparative Example 1. LiF and Li3N are known to be good lithium-ion conductors, facilitating rapid lithium-ion transport and blocking electron migration, thus enhancing the interfacial stability of the polymer electrolyte with lithium metal.
[0071] Figure 10 The graph shows the cycle performance of the NCM622 full cell assembled with the polymer electrolyte for the fluorinated solid lithium battery obtained in Comparative Example 2 at 0.5C. Compared with Examples 1-3, this comparative example has a lower initial discharge specific capacity (134.2 mAh g⁻¹). -1 It has a low capacity retention rate; after 100 cycles at a current density of 0.5C, the capacity retention rate is 84.9%.
[0072] Figure 11 The graph shows the cycle performance of the NCM622 full cell assembled with a polymer electrolyte for the fluorinated nitride solid lithium battery obtained in Comparative Example 3 at 0.5C; compared with Examples 1-3, this comparative example has a lower initial discharge specific capacity (151.4 mAh g). -1 It has a low capacity retention rate; after 100 cycles at a current density of 0.5C, the capacity retention rate is 86.3%.
[0073] The above results show that, compared with Comparative Examples 1-3, the symmetric cells and full cells in Examples 1-3 exhibit significantly better cycle stability. Compared with Comparative Examples 1-3, the lithium-to-lithium symmetric cell assembled with the materials obtained in Example 3 shows better cycle stability at 0.5 mA cm⁻¹.-2 The material exhibits better cycle stability at current densities, achieving stable cycling for over 700 hours. The NCM622 full cell can stably cycle 700 times at 0.5C with a capacity retention of 83.9%. This demonstrates that the material prepared using the method of this invention improves the interfacial stability between the electrolyte and the electrode, thereby enabling stable lithium ion deposition and stripping, and enhancing electrochemical stability. Furthermore, this preparation method avoids the volatilization of large amounts of organic solvents in traditional solution casting methods, offering environmental benefits. The method is also highly efficient and rapid, showing promising prospects for industrial application.
[0074] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for preparing a UV-curable polymer electrolyte for a fluorinated nitride solid-state lithium battery, characterized in that: Includes the following steps: 1) Mix the fluorinated acrylate monomer and the photoinitiator to obtain a mixture; 2) Under a protective atmosphere, the mixture from step 1) is photopolymerized to obtain a prepolymerized slurry; 3) Mix the prepolymer slurry with the multifunctional amide monomer, lithium salt electrolyte, and photoinitiator to obtain a mixed slurry; 4) The mixed slurry is coated onto the support material and photopolymerized and cured to obtain a fluorinated and nitrided solid-state polymer electrolyte membrane for lithium batteries; Step 1) The fluorinated acrylate monomer is an acrylate monomer with a monofunctional group and a fluorinated side chain; Step 3) The number of double bond functional groups of the multifunctional amide monomer is ≥2, and the multifunctional amide monomer is selected from one or more of N,N′-methylenebisacrylamide, ethylenediaminebisacrylamide, propylenediaminebisacrylamide, butanediaminebisacrylamide, and N,N′-ethylenebisacrylamide. In step 2), the viscosity of the prepolymer slurry obtained by photopolymerization is 300 cP to 10000 cP.
2. The method for preparing the ultraviolet-cured polymer electrolyte for fluorinated nitride solid-state lithium batteries according to claim 1, characterized in that: Step 1) The fluorinated acrylate monomer is selected from one or more of trifluoroethyl methacrylate, tetrafluoropropyl methacrylate, hexafluorobutyl methacrylate, octafluoropentyl methacrylate, tridecyl fluorooctyl methacrylate and heptadecafluorodecyl methacrylate; Step 3) The lithium salt electrolyte is selected from one or more of lithium perchlorate, lithium tetrafluoroborate, lithium hexafluoroarsenate, lithium hexafluorophosphate, lithium bis(oxalate)borate, lithium difluorooxalateborate, lithium bis(difluorosulfonyl)imide, and lithium bis(trifluoromethylsulfonyl)imide.
3. The method for preparing the ultraviolet-cured polymer electrolyte for fluorinated nitride solid-state lithium batteries according to claim 1, characterized in that: The amounts of each raw material are as follows: 0.5 to 100 parts by weight of fluorinated acrylate monomer, 0.111 to 11.1 parts by weight of polyfunctional amide monomer, 0.01 to 2 parts by weight of photoinitiator, and 3.7 to 370 parts by weight of lithium salt electrolyte. In step 1), the amount of photoinitiator is 0.0005 to 0.1 parts by mass, and in step 3), the amount of photoinitiator is 0.0095 to 1.9 parts by mass.
4. The method for preparing the ultraviolet-cured polymer electrolyte for fluorinated nitride solid-state lithium batteries according to claim 3, characterized in that: The fluorinated acrylate monomer is 0.5 to 10 parts by weight, the polyfunctional amide monomer is 0.111 to 1.11 parts by weight, the photoinitiator is 0.02 to 0.2 parts by weight, and the lithium salt electrolyte is 3.7 to 37 parts by weight; In step 1), the amount of photoinitiator is 0.0005 to 0.01 parts by mass, and in step 3), the amount of photoinitiator is 0.0095 to 0.19 parts by mass.
5. The method for preparing the ultraviolet-cured polymer electrolyte for fluorinated nitride solid-state lithium batteries according to claim 1, characterized in that: The photoinitiator mentioned in steps 1) and 3) is selected from hydrogen-abstracting free radical or cleavage free radical ultraviolet photoinitiator, specifically selected from one or more of diphenylethylene glycol, dialkoxyacetophenone, α-hydroxyalkylacetophenone, methyl benzoylformate, 2,4-diethylthionone, 2-hydroxy-2-methylphenylpropane-1-one, 2-hydrothionone, and α,α'-ethoxyacetophenone; Step 2) When performing ultraviolet light polymerization, the energy of ultraviolet irradiation is 500-5000 mJ.
6. The method for preparing the ultraviolet-cured polymer electrolyte for fluorinated nitride solid-state lithium batteries according to claim 1, characterized in that: Step 4) The thickness of the electrolyte membrane formed by coating the slurry onto the support material is 10 μm to 1000 μm. Step 4) The light curing is ultraviolet light curing, and the curing energy of ultraviolet light curing is 500 mJ to 5000 mJ.
7. A UV-curable polymer electrolyte for a solid-state lithium battery made by the preparation method according to any one of claims 1 to 6.
8. The application of the polymer electrolyte according to claim 7, characterized in that: The polymer electrolyte is used in lithium batteries as a solid electrolyte.