Battery separator and manufacturing method thereof

Abstract

The present invention proposes a battery separator comprising at least one base film, at least one inorganic layer disposed on the base film, and a plurality of polymeric microparticles disposed on the inorganic layer, the density of which is lower than that of the inorganic layer. The method involves blending the polymeric microparticles with barium titanate to form a multilayer structure, coating the resulting slurry on the base film, and then baking it in an oven. During the baking process, due to the density difference between the barium titanate and the polymeric microparticles, the denser barium titanate sinks and the polymeric microparticles float, resulting in a battery separator with excellent heat resistance and high adhesion.

Description

[Technical Field]

[0001] The present invention relates to the field of lithium ion battery separators, and more particularly to battery separators and methods for making same. [Background technology]

[0002] The excessive use of fossil fuels has caused serious environmental pollution problems. To address these issues, the use of alternative energy materials to replace fossil fuels has become particularly important. Lithium-ion batteries are widely used in household appliances, power products, and energy storage products due to their advantages such as high energy density, high safety and stability, and long cycle life.

[0003] Battery separators are a key component in lithium batteries. Currently, microporous battery separators are typically manufactured by extrusion, extraction, and stretching of polyolefin materials. To improve the separator's heat resistance, a polyolefin base film is typically coated with a highly heat-resistant inorganic material (e.g., ceramics, cellulose, aramid, etc.). However, inorganic particles have poor dispersion, are prone to shedding, and suffer from severe powder shedding. They must be combined with other components, significantly increasing production costs. Furthermore, to meet the requirements of current battery manufacturing processes, strong adhesion between the separator and the electrode plates is essential to prevent electrode tab misalignment. The current approach to producing separators with high heat resistance and adhesiveness is to coat inorganic particle powder with an adhesive layer (PVDF). However, PVDF has a relatively high softening point, making it difficult to reach its softening point at low hot-pressing temperatures, resulting in a lack of significant adhesion between the separator and the positive and negative electrode plates.

[0004] The battery separator proposed by the present invention effectively solves the problems of existing battery separators, such as low heat resistance, a narrow hot pressing process window for the separator and electrode plates, the need for two coating processes to manufacture separators with high heat resistance and high adhesion, which consumes a large amount of energy, the complex composition of the coating material, and poor slurry stability, resulting in large fluctuations in the physical property parameters of the coating during the coating process, and has superior performance compared to conventional separators. Summary of the Invention

[0005] The object of the present invention is to provide a method for manufacturing a semiconductor device comprising: at least one inorganic layer located on the base film; and a plurality of polymer fine particles located on the inorganic layer and having a density lower than that of the inorganic layer.

[0006] Preferably, the inorganic layer comprises one or more of barium titanate, alumina, silica, and titanium dioxide.

[0007] Preferably, the polymeric microparticles include one or more of a polyacrylonitrile layer, a polystyrene layer, a polyvinylidene fluoride layer, a polymethyl methacrylate layer, and a polyacrylamide layer.

[0008] Preferably, the polymeric microparticles have a vegetable oil layer on the outside. Preferably, the vegetable oil layer comprises one or more of sunflower seed oil, tallow seed oil, olive oil, rubber seed oil, castor oil, tung oil, palm oil.

[0009] Preferably, the polymer microparticles further contain a plurality of cellulose nanofibrils, the plurality of cellulose nanofibrils being located outside the vegetable oil layer, and some of the plurality of cellulose nanofibrils being connected to the inorganic layer. Preferably, the cellulose nanofibrils comprise one or more of absorbent cotton, paper pulp, wood pulp, and hemp.

[0010] Another object of the present invention is to provide a method for producing a vegetable oil-based precursor, comprising the steps of: mixing vegetable oil, N-methylethanolamine, and a catalyst, and then sealing and heating the mixture to obtain a vegetable oil-based precursor; mixing the vegetable oil-based precursor and anhydride, and then sealing and heating the mixture to obtain a vegetable oil-based acrylate monomer; mixing the vegetable oil-based acrylate monomer, peroxybenzoic acid, and sodium carbonate, and then sealing and stirring at room temperature to obtain a vegetable oil-based acrylate epoxy monomer; and uniformly mixing the vegetable oil-based acrylate epoxy monomer, styrene monomer, methyl methacrylate monomer, vinylidene fluoride monomer, and acrylonitrile monomer. the resulting mixture is cooled to room temperature after the reaction is completed, and then filtered through a filter mesh to obtain a polymer composite emulsion; the polymer composite emulsion is mixed with an inorganic substance to obtain a coating slurry; and the coating slurry is applied to a base film and baked to obtain a battery separator.

[0011] Preferably, the cellulose nanofibril suspension comprises one or more of absorbent cotton, paper pulp, wood pulp, and hemp. Preferably, the inorganic material comprises one or more of barium titanate, alumina, silica, and titanium dioxide.

[0012] Preferably, the heating temperature after mixing the vegetable oil, the N-methylethanolamine, and the catalyst is 50 to 80°C, and the reaction time is 8 hours; the heating temperature after mixing the vegetable oil-based precursor and the anhydride is 60 to 80°C, and the reaction time is 8 to 12 hours; and the stirring time for mixing the vegetable oil-based acrylate monomer, the peroxybenzoic acid, and the sodium carbonate is 12 hours.

[0013] Preferably, the ultrasonic disrupter has a processing power of 600 to 800 watts and a processing time of 10 to 15 minutes, and is characterized in that the Pickering emulsion is dropped into the mixed solvent, then the water-soluble initiator is added, and polymerization is carried out at 60 to 80°C for 2 to 4 hours.

[0014] Preferably, the oil / water ratio of the oil / water mixture is 1:4-8. Preferably, the water-soluble initiator comprises one or more of ammonium persulfate, potassium persulfate, and peroxide. Preferably, after the coating slurry is applied to the base film, it is baked at 60 to 90° C. for 0.5 to 3 minutes.

[0015] In this disclosure, vegetable oil-based acrylate monomers are synthesized using vegetable oil as a raw material, and methacrylate monomers, vinylidene fluoride monomers, acrylonitrile monomers, acrylamide monomers, and styrene monomers are added in predetermined proportions. Cellulose nanofibrils are dispersed and polymerized using a stabilizer, a mixture of ethanol and water as a dispersant, and azobisisobutyronitrile as an initiator. This manufacturing method is more environmentally friendly than conventional manufacturing methods. The resulting multilayered polymer microparticles are then blended with barium titanate, and the blended slurry is directly coated onto a substrate and then baked in an oven. During the baking process, due to the density difference between the barium titanate and the polymer microparticles, the denser barium titanate sinks, while the polymer microparticles float. This results in a battery separator with excellent heat resistance and high adhesion. Furthermore, the manufacturing process requires only one coating, significantly reducing energy consumption and costs compared to the currently commonly used two-coating method. Furthermore, the battery separator proposed by the present invention is suitable for hot pressing processes used by various battery manufacturers, and has adhesive strength with the electrode plates over a hot pressing temperature range of 25 to 150°C. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic diagram of a battery separator in one embodiment of the present invention. [Figure 2] 1 is a schematic diagram of polymeric microparticles in one embodiment of the present invention. [Figure 3] 1 is a flowchart of a method for manufacturing a battery separator in one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It should be understood that the specific embodiments described in this specification are for the purpose of explaining and interpreting the present invention, and are not intended to limit the present invention.

[0018] The endpoints of ranges and any value disclosed herein should be understood to be inclusive of any values ​​close to those ranges or values, and any ranges between the endpoints, between the endpoints and individual point values, and between the individual point values ​​can be combined to obtain one or more new numerical ranges, which are considered to be specifically disclosed herein.

[0019] Referring to FIG. 1, FIG. 1 is a schematic diagram of a battery separator in one embodiment of the present invention. The battery separator 100 includes at least one base film 1, at least one inorganic layer 2, and a plurality of polymeric microparticles 3. In one embodiment of the present invention, the polymeric microparticles 3 are spherical. The inorganic layer 2 is located between the base film 1 and the plurality of polymeric microparticles 3. The polymeric microparticles 3 have a multi-layer structure, and the density of the polymeric microparticles 3 is lower than the density of the inorganic layer 2. Preferably, the base film 1 may be made of polypropylene, and the inorganic layer 2 may include one or more of barium titanate, alumina, silica, and titanium dioxide.

[0020] Referring to FIG. 2, FIG. 2 is a schematic diagram of a polymeric microparticle in one embodiment of the present invention. The polymeric microparticle 3 is a polymer. The polymeric microparticle 3 may include one or more of a polyacrylonitrile layer 31, a polystyrene layer 32, a polyvinylidene fluoride layer 33, a polymethyl methacrylate layer 34, and a polyacrylamide layer 35. In one embodiment of the present invention, the polymeric microparticle 3 includes, in order from the inside to the outside, a polyacrylonitrile layer 31, a polystyrene layer 32, a polyvinylidene fluoride layer 33, a polymethyl methacrylate layer 34, a polyacrylamide layer 35, a vegetable oil layer 36, and a plurality of cellulose nanofibrils 37. Preferably, the vegetable oil layer 36 may include one or more of sunflower seed oil, tallow seed oil, olive oil, rubber seed oil, castor oil, tung oil, and palm oil, and the cellulose nanofibrils may include one or more of absorbent cotton, paper pulp, wood pulp, and hemp.

[0021] Referring to Figure 3, Figure 3 is a flow chart of a method for manufacturing a battery separator in one embodiment of the present invention. The manufacturing method will be described in detail below.

[0022] In step S1, the vegetable oil-based acrylate epoxy monomer is first prepared. 8-20 parts vegetable oil, 1-4 parts N-methylethanolamine, and 0.1-1 part catalyst are mixed, sealed, and heated to 50-80°C for 8 hours. The unreacted materials and catalyst are then removed to obtain a vegetable oil-based precursor. 8-20 parts vegetable oil-based precursor and 2-15 parts anhydride are mixed, sealed, and heated to 60-80°C for 8-12 hours. The unreacted materials are then removed to obtain a vegetable oil-based acrylate monomer. Next, 8-20 parts vegetable oil-based acrylate monomer, 2-5 parts peroxybenzoic acid, and 5-10 parts sodium carbonate are mixed, sealed, and stirred at room temperature for 12 hours. The unreacted materials are then removed to obtain a vegetable oil-based acrylate epoxy monomer.

[0023] In step S2, a polymer composite emulsion and coating slurry are prepared. A mixture of 8-20 parts vegetable oil-based acrylate epoxy monomer, 1-8 parts styrene monomer, 1-3 parts methyl methacrylate, 2-5 parts vinylidene fluoride monomer, and 3-5 parts acrylonitrile monomer is added dropwise to 40-400 parts cellulose nanofibril suspension and stirred uniformly to obtain an oil-water mixture. Next, the mixture is treated for 10-15 minutes in an ultrasonicator with a power of 600-800 watts to obtain a Pickering emulsion. 60-80 parts of the Pickering emulsion are added dropwise to a mixed solvent of ethanol and water, and 0.2-0.4 parts of a water-soluble initiator are added. Preferably, the water-soluble initiator may include one or more of ammonium persulfate, potassium persulfate, and peroxide. The mixture is then placed in a thermostatic chamber and polymerized at 60-80°C for 2-4 hours. After the reaction is complete, the temperature is lowered to room temperature and the mixture is filtered through a 100-300 mesh nylon filter to obtain a polymer composite emulsion. Preferably, the oil-water mixture has an oil-water ratio of 1:4-8. Finally, 10-30 parts of the polymer composite emulsion and 70-90 parts of barium titanate are blended to obtain a coating slurry.

[0024] In another embodiment of the present invention, the proportions of the blended ingredients may be 0.1 to 2 parts cellulose nanofibrils, 3 to 7 parts vegetable oil polymer, 1 to 3 parts polystyrene, 3 to 6 parts polymethyl methacrylate, 1 to 5 parts polyvinylidene fluoride, 1 to 3 parts polyacrylonitrile, 1 to 4 parts polyacrylamide, and 70 to 89.9 parts barium titanate, with the total blended ingredients being 100 parts. In another embodiment of the present invention, the solids content of the cellulose nanofibrils is 0.1 wt% to 1 wt%.

[0025] In step S3, a battery separator is manufactured by uniformly applying 1 to 3 parts of the coating slurry onto the base film 1 by roll coating, and baking it in a ventilated oven at 60 to 90°C for 0.5 to 3 minutes to obtain a battery separator that has both heat resistance and adhesiveness.

[0026] The following examples are illustrative of methods for manufacturing battery separators in accordance with the present disclosure.

[0027] Example 1 The method for producing the vegetable oil-based acrylate epoxy monomer specifically includes the following steps:

[0028] (1) Prepare 50 parts by mass of palm oil and purge it with nitrogen gas at 100°C for 30 minutes. After heating the palm oil to 65°C, add 8 parts by mass of amino alcohol and 1 part by mass of sodium methoxide solution (5 mol / L). The mixture is sealed and reacted at 65°C for 8 hours. The mixture is then poured into 50 parts by mass of dichloromethane (DCM) and dissolved. Next, the mixture is washed with saturated sodium chloride and further dried over anhydrous magnesium sulfate to obtain a vegetable oil-based precursor.

[0029] (2) Mix 50 parts of a vegetable oil-based precursor, 15 parts of anhydride, and 0.4 parts of 4-dimethylaminopyridine, seal, and heat to 65°C. After reacting for 8 hours, pour into 50 parts of dichloromethane to dissolve, wash with saturated sodium bicarbonate and saturated sodium chloride, respectively, then dry with anhydrous magnesium sulfate, and pass through a basic alumina column to obtain a vegetable oil-based acrylate monomer.

[0030] (3) 50 parts of vegetable oil-based acrylate monomer, 10 parts of sodium carbonate, and 6 parts of hydrogen peroxide are each added dropwise to 50 parts of dichloromethane and dissolved. After stirring at room temperature for 8 hours, the mixture is washed with saturated sodium thiosulfate, saturated sodium bicarbonate, and saturated sodium chloride solutions, respectively, dried over anhydrous magnesium sulfate, and then passed through a basic alumina column to obtain a vegetable oil-based acrylate epoxy monomer.

[0031] Example 2 The manufacturing method of the battery separator specifically includes the following steps: (1) 5 parts by mass of the vegetable oil-based acrylate epoxy monomer produced in Example 1, 2 parts by mass of styrene monomer, 4 parts by mass of methyl methacrylate, 3 parts by mass of vinylidene fluoride, 2 parts by mass of acrylonitrile, and 4 parts by mass of acrylamide monomer were mixed and added dropwise to 80 parts by mass of a 0.2 wt% cellulose nanofibril suspension. After thorough mixing until homogenous, the mixture was treated in an ultrasonicator at 600 watts for 10 minutes to obtain Pickering Emulsion 1. The stability, particle size, and viscosity parameters of Pickering Emulsion 1 are shown in Table 1.

[0032] (2) 50 parts of Pickering emulsion 1 is placed in a thermostatic chamber at 65°C, and nitrogen gas is introduced to remove oxygen for 30 minutes. 0.2 parts of potassium persulfate, a water-soluble initiator, is added and reacted for 3 hours. The mixture is then heated to 80°C and reacted for 30 minutes. The mixture is then cooled to room temperature and filtered through a 100-mesh nylon filter net to obtain a polymer composite emulsion.

[0033] (3) 10 parts of the polymer composite emulsion and 90 parts of a barium titanate solution (solid content 20 wt%) were blended and mechanically stirred for 2 hours to obtain a coating slurry, which was then uniformly coated onto a polypropylene base film using a roll coater and baked in an oven at 60°C for 1 minute to obtain a battery separator.

[0034] Comparative Example 1 The manufacturing method of the battery separator specifically includes the following steps: (1) 5 parts by mass of the vegetable oil-based acrylate epoxy monomer produced in Example 1, 2 parts by mass of styrene monomer, 4 parts by mass of methyl methacrylate, 3 parts by mass of vinylidene fluoride, 2 parts by mass of acrylonitrile, and 4 parts by mass of acrylamide monomer were mixed and added dropwise to 80 parts by mass of a 0.5 wt% cellulose nanofibril suspension. After thorough mixing until homogenous, the mixture was treated in an ultrasonicator at 600 watts for 10 minutes to obtain Pickering Emulsion 2. The stability, particle size, and viscosity parameters of Pickering Emulsion 2 are shown in Table 1.

[0035] (2) 50 parts of Pickering emulsion 2 is placed in a thermostatic chamber at 65°C, and nitrogen gas is introduced to remove oxygen for 30 minutes. 0.2 parts of potassium persulfate, a water-soluble initiator, is added and reacted for 3 hours. The temperature is then raised to 80°C and reacted for 30 minutes. The temperature is then lowered to room temperature, and the mixture is filtered through a 100-mesh nylon filter net to obtain a polymer composite emulsion.

[0036] (3) 10 parts of the polymer composite emulsion and 90 parts of a barium titanate solution (solid content 20 wt%) were blended and mechanically stirred for 2 hours to obtain a coating slurry, which was then uniformly coated onto a polypropylene base film using a roll coater and baked in an oven at 60°C for 1 minute to obtain a battery separator.

[0037] Comparative Example 2 The manufacturing method of the battery separator specifically includes the following steps: (1) 5 parts by mass of the vegetable oil-based acrylate epoxy monomer produced in Example 1, 2 parts by mass of styrene monomer, 4 parts by mass of methyl methacrylate, 3 parts by mass of vinylidene fluoride, 2 parts by mass of acrylonitrile, and 4 parts by mass of acrylamide monomer were mixed and added dropwise to 160 parts by mass of a 0.2 wt% cellulose nanofibril suspension. After thorough mixing until homogenous, the mixture was treated in an ultrasonicator at 600 watts for 10 minutes to obtain Pickering Emulsion 3. The stability, particle size, and viscosity parameters of Pickering Emulsion 3 are shown in Table 1.

[0038] (2) 50 parts of Pickering emulsion 3 is placed in a thermostatic chamber at 65°C, nitrogen gas is introduced to remove oxygen for 30 minutes, 0.2 parts of potassium persulfate, a water-soluble initiator, is added, and the mixture is reacted for 3 hours. The mixture is then heated to 80°C and reacted for 30 minutes, cooled to room temperature, and filtered through a 100-mesh nylon filter net to obtain a polymer composite emulsion.

[0039] (3) 10 parts of the polymer composite emulsion and 90 parts of a barium titanate solution (solid content 20 wt%) were blended and mechanically stirred for 2 hours to obtain a coating slurry, which was then uniformly coated onto a polypropylene base film using a roll coater and baked in an oven at 60°C for 1 minute to obtain a battery separator.

[0040] Comparative Example 3 The manufacturing method of the battery separator specifically includes the following steps: (1) 5 parts by mass of the vegetable oil-based acrylate epoxy monomer produced in Example 1, 2 parts by mass of styrene monomer, 4 parts by mass of methyl methacrylate, 3 parts by mass of vinylidene fluoride, 2 parts by mass of acrylonitrile, and 4 parts by mass of acrylamide monomer were mixed and added dropwise to 80 parts by mass of a 0.2 wt% cellulose nanofibril suspension. After thorough mixing until homogenous, the mixture was treated in an ultrasonic disrupter with a power of 600 watts for 10 minutes to obtain Pickering emulsion 1.

[0041] (2) 50 parts of Pickering emulsion 1 is placed in a thermostatic chamber at 65°C, and nitrogen gas is introduced to remove oxygen for 30 minutes. 0.2 parts of potassium persulfate, a water-soluble initiator, is added and reacted for 3 hours. The temperature is then raised to 80°C and reacted for 30 minutes. The temperature is then lowered to room temperature, and the mixture is filtered through a 100-mesh nylon filter net to obtain a polymer composite emulsion.

[0042] (3) 10 parts of the polymer composite emulsion is uniformly coated on a polypropylene base film using a roll coater, and baked in an oven at 60°C for 1 minute to obtain a battery separator.

[0043] Table 1 JPEG2025534533000002.jpg60170

[0044] The characteristic parameters of the battery separators manufactured by the methods of Example 2, Comparative Example 1, Comparative Example 2, and Comparative Example 3 are shown in Table 2. As can be seen from Table 2, the battery separator manufactured by the method of Example 2 had the smallest thermal shrinkage rate and the highest adhesive strength of the positive electrode.

[0045] Table 2 JPEG2025534533000003.jpg95170

[0046] In this disclosure, vegetable oil-based acrylate monomers are synthesized using vegetable oil as a raw material, and methacrylate monomers, vinylidene fluoride monomers, acrylonitrile monomers, acrylamide monomers, and styrene monomers are added in predetermined proportions. Cellulose nanofibrils are dispersed and polymerized using a stabilizer, a mixture of ethanol and water as a dispersant, and azobisisobutyronitrile as an initiator. This manufacturing method is more environmentally friendly than conventional manufacturing methods. The resulting multilayered polymer microparticles are then blended with barium titanate, and the blended slurry is directly coated onto a substrate and then baked in an oven. During the baking process, due to the density difference between the barium titanate and the polymer microparticles, the denser barium titanate sinks, while the polymer microparticles float. This results in a battery separator with excellent heat resistance and high adhesion. Furthermore, the manufacturing process requires only one coating, significantly reducing energy consumption and costs compared to the currently commonly used two-coating method. Furthermore, the battery separator proposed by the present invention is suitable for hot pressing processes used by various battery manufacturers, and has adhesive strength with the electrode plates over a hot pressing temperature range of 25 to 150°C.

[0047] The above description is merely a few specific embodiments of the present invention and does not limit the present invention, and any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and principle of the present invention should be included in the protection scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but should be determined based on the scope of the claims.

Claims

1. at least one base membrane; at least one inorganic layer located on the base film; a plurality of polymeric fine particles located on the inorganic layer and having a density lower than that of the inorganic layer.

2. 10. The battery separator of claim 1, wherein said inorganic layer comprises one or more of barium titanate, alumina, silica, and titanium dioxide.

3. 3. The battery separator of claim 2, wherein the polymeric particles include one or more of a polyacrylonitrile layer, a polystyrene layer, a polyvinylidene fluoride layer, a polymethyl methacrylate layer, and a polyacrylamide layer.

4. 4. The battery separator of claim 3, wherein the polymeric microparticles have a vegetable oil layer on the outside.

5. 5. The battery separator of claim 4, wherein the vegetable oil layer comprises one or more of sunflower seed oil, tallow seed oil, olive oil, rubber seed oil, castor oil, tung oil, and palm oil.

6. The battery separator of claim 4, wherein the polymer microparticles further contain a plurality of cellulose nanofibrils, the plurality of cellulose nanofibrils being located outside the vegetable oil layer, and a portion of the plurality of cellulose nanofibrils being connected to the inorganic layer.

7. 7. The battery separator of claim 6, wherein the cellulose nanofibrils comprise one or more of absorbent cotton, paper pulp, wood pulp, and hemp.

8. mixing vegetable oil, N-methylethanolamine, and a catalyst, and heating in a sealed state to obtain a vegetable oil-based precursor; mixing the vegetable oil-based precursor with an anhydride, sealing and heating to obtain a vegetable oil-based acrylate monomer; Mixing the vegetable oil-based acrylate monomer, peroxybenzoic acid, and sodium carbonate, and stirring at room temperature in a sealed container to obtain a vegetable oil-based acrylate epoxy monomer; The vegetable oil-based acrylate epoxy monomer, styrene monomer, methyl methacrylate monomer, vinylidene fluoride monomer, and acrylonitrile monomer are mixed uniformly, and then added dropwise to the cellulose nanofibril suspension, followed by mixing and stirring to obtain an oil-water mixture, and then the oil-water mixture is treated with an ultrasonic disintegrator to obtain a Pickering emulsion; the Pickering emulsion is dropped into a mixed solvent of ethanol and water, a water-soluble initiator is added, and after the reaction is completed, the temperature is lowered to room temperature, and then the mixture is filtered through a filter net to obtain a polymer composite emulsion; mixing the polymer composite emulsion with an inorganic substance to obtain a coating slurry; and b. applying the coating slurry onto a base film and baking the coating slurry to obtain a battery separator.

9. 9. The method for manufacturing a battery separator according to claim 8, wherein the cellulose nanofibril suspension comprises one or more of absorbent cotton, paper pulp, wood pulp, and hemp.

10. 9. The method of claim 8, wherein the inorganic material comprises one or more of barium titanate, alumina, silica, and titanium dioxide.

11. 10. The method for manufacturing a battery separator according to claim 8, wherein the heating temperature after mixing the vegetable oil, the N-methylethanolamine, and the catalyst is 50-80°C, and the reaction time is 8 hours; the heating temperature after mixing the vegetable oil-based precursor and the anhydride is 60-80°C, and the reaction time is 8-12 hours; and the stirring time for mixing the vegetable oil-based acrylate monomer, the peroxybenzoic acid, and the sodium carbonate is 12 hours.

12. 12. The method for manufacturing a battery separator according to claim 11, wherein the ultrasonic disruption device has a processing power of 600-800 watts and a processing time of 10-15 minutes, and the Pickering emulsion is dropped into the mixed solvent, and then the water-soluble initiator is added, followed by polymerization at 60-80°C for 2-4 hours.

13. 9. The method for manufacturing a battery separator according to claim 8, wherein the oil-water mixture has an oil-water ratio of 1:4-1:

8.

14. 10. The method of claim 8, wherein the water-soluble initiator comprises one or more of ammonium persulfate, potassium persulfate, and peroxide.

15. 13. The method for manufacturing a battery separator according to claim 12, wherein the coating slurry is applied to the base film and then baked at 60 to 90° C. for 0.5 to 3 minutes.

Images