A high adhesion polymer coating separator and method of making the same

Abstract

The present application relates to the technical field of lithium ion battery separator, in particular to a high adhesion polymer coating separator and a preparation method thereof. The high adhesion polymer coating separator is coated with high adhesion polymer slurry on the surface of the base film, wherein the high adhesion polymer slurry comprises high adhesion polymer dispersion, aqueous polymer glue, suspension stabilizer, auxiliary agent and slurry solvent; the high adhesion polymer dispersion comprises emulsifier, solvent and high adhesion polymer particles with core-shell structure, wherein the particles have the core-shell structure with soft core (soft monomer in the core layer) and hard shell (hard monomer in the shell layer), so that the polymer particles are easy to disperse, have the characteristics of uniform and consistent dispersion in the solvent and good stability, and the high adhesion polymer coating separator is suitable for the preparation of batteries by using wet pressing and / or dry pressing battery process; after the battery is prepared, the heat pressing formation condition is mild, the adhesion is excellent, and the good battery hardness and long cycle life of the soft package battery can be ensured.

Description

Technical Field

[0001] This invention relates to the field of separator technology for lithium-ion batteries, specifically to a high-adhesion polymer-coated separator and its preparation method. Background Technology

[0002] Currently, soft-pack batteries used in the 3C and power battery markets generally employ functionally coated separators to achieve ultra-thin battery thickness, improve battery hardness, and extend cycle life. These separators are coated with PVDF on one or both sides. During the hot-pressing process, the PVDF coating swells in the electrolyte, generating adhesion that bonds the positive and negative electrode materials, forming a tight sandwich structure of positive electrode / separator / negative electrode, thus improving battery performance. PVDF-coated separators are made using aqueous PVDF slurry. However, the mainstream aqueous PVDF-coated separators currently on the market generally suffer from the following problems: firstly, the PVDF material is unevenly coated on the separator surface; secondly, the coating adhesion is poor after drying; and thirdly, when cells made from separators containing the PVDF coating are hot-pressed, the batteries become soft, and disassembly reveals poor adhesion between the PVDF coating and the electrode sheets, resulting in low yield and poor battery performance in soft-pack batteries. Fourth, the PVDF material used for diaphragm coating is not domestically produced and is in a situation of oligopoly by foreign companies. The high price and insufficient production capacity result in high diaphragm coating costs, which is not conducive to the large-scale application of the product in the market. There is an urgent need to find an alternative material.

[0003] Most existing aqueous PVDF slurries are made by dispersing hydrophobic PVDF powder in water using a strong mechanical stirring process after adding aqueous additives. Some products can also add functional powders and fillers to form a mixed slurry. Such products often have the following problems: First, the types and amounts of additives are relatively large, and these additives can cause dissolution and migration problems in the battery electrolyte, resulting in a short battery cycle life; Second, due to the hydrophobic properties of PVDF, amphiphilic additives are needed to emulsify and disperse PVDF in water, and the suspension and dispersion performance of PVDF in the freshly prepared slurry is relatively poor. Okay, but there are problems such as short product shelf life and sedimentation of slurry during transportation; during production and use, mechanical external forces such as stirring and high-speed coating can easily cause the stability of slurry to be damaged, resulting in a series of problems such as demulsification, agglomeration and coarsening, and particle sedimentation; thirdly, the PVDF slurry produced by the above process has good PVDF particle integrity and no damaged crystal structure. Therefore, it is difficult to destroy the crystal structure of PVDF during hot pressing (conditions: electrolyte wetting, certain temperature and pressure), so it exhibits problems such as poor swelling and poor adhesion, which seriously affects the battery application effect.

[0004] The use of water-based PVDF slurry to prepare PVDF coated membranes has been on the market for at least 8 years, but the problems of uneven PVDF membrane coating, poor adhesion, and short battery cycle life have not been truly solved. The root cause is the hydrophobicity of PVDF and its incompatibility with water, which leads to many problems in the application of water-based PVDF. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, one objective of this invention is to provide a high-adhesion polymer-coated separator. The separator is coated with a high-adhesion polymer slurry containing a high-adhesion polymer dispersion. This dispersion contains polymer particles with a core-shell structure. These polymer particles, as a substitute for PVDF, exhibit similar hot-pressing adhesion properties to PVDF. Furthermore, these polymer particles are easily dispersed, exhibiting uniform dispersion in water and excellent stability. After coating the separator with this slurry, the coating amount is small, resulting in low basis weight and high peel strength. Batteries made using this separator exhibit mild hot-pressing formation conditions and excellent adhesion, ensuring good battery hardness and long cycle life for pouch batteries. A second objective of this invention is to provide a method for preparing a high-adhesion polymer-coated separator.

[0006] One of the objectives of this invention is achieved through the following technical solution:

[0007] A high-adhesion polymer-coated diaphragm includes a base film, at least one surface of which is coated with a high-adhesion polymer slurry to form a coating layer having a high-adhesion polymer, wherein the high-adhesion polymer slurry includes a high-adhesion polymer dispersion, an aqueous polymeric adhesive, a suspension stabilizer, an additive, and a slurry solvent;

[0008] The high-adhesion polymer dispersion is used in an amount of 3-30 wt% of the solvent weight, and the aqueous polymer adhesive is used in an amount of 0.5-10 wt% of the solvent weight. The suspension stabilizer is used in an amount of 0.5-5 wt% of the high-adhesion polymer dispersion. The additives are used in an amount of 0.1-2 wt% of the high-adhesion polymer dispersion.

[0009] The high-adhesion polymer dispersion includes an emulsifier, a solvent, and high-adhesion polymer particles with a core-shell structure. The core-shell structure is formed by a polymer formed with a first monomer and a first initiator as the core layer and a polymer formed with a second monomer and a second initiator as the shell layer; wherein, the glass transition temperature of the first monomer is -70℃ < T. g <0℃, the glass transition temperature of the second monomer is 0℃ <T g <200℃.

[0010] The first monomer reacts with the first initiator to form core-layer particles, and the second monomer reacts with the second initiator around the core-layer particles to form larger particles, forming a shell layer, and finally forming polymer particles with high adhesion. The emulsifier is used to pre-emulsify the first monomer and the second monomer to form the first monomer emulsion and the second monomer emulsion, respectively. The solvent is used to dilute the first monomer emulsion and the second monomer emulsion.

[0011] It should be further explained that the first monomer is a soft monomer, and the second monomer is a hard monomer. The soft monomer imparts excellent flexibility, ductility, and adhesion to the material; the hard monomer imparts excellent heat resistance, solvent resistance, and hardness. The combination of an inner soft layer (soft core monomer) and an outer hard layer (hard shell monomer) creates a unique core-shell structure. The shell layer can locally swell in the electrolyte environment to bond the separator to the positive and negative electrodes; the core layer can bond the separator to the positive and negative electrodes even after the shell layer ruptures due to a hot-pressing (temperature + pressure) process. The mass ratio of the first monomer to the second monomer is 1:1.1 to 1.8, and the particle size formed by the core layer formed by the first monomer and the shell layer formed by the second monomer is 200 to 600 nm.

[0012] If the glass transition temperature of the soft monomer is too high, the core layer of soft monomers will lack sufficient adhesion after the shell breaks during the hot-pressing process, failing to bond the separator and the positive and negative electrodes. If the glass transition temperature of the soft monomer is too low, the soft monomers will have poor solvent resistance after the shell breaks during the hot-pressing process, being dissolved by the electrolyte, leading to separator pore blockage and affecting battery performance, making this a less desirable option. If the glass transition temperature of the hard monomer is too high, the shell will be too brittle, easily breaking during production, transportation, and use, resulting in poor product quality. If the glass transition temperature of the hard monomer is too low, the shell will lack sufficient hardness and have poor solvent resistance, easily being dissolved by the electrolyte, leading to separator pore blockage and affecting battery performance, also making this a less desirable option.

[0013] Furthermore, the first monomer is one or more of the following: ethyl acrylate, n-butyl acrylate, isobutyl acrylate, isooctyl acrylate, 2-hydroxyethyl acrylate, hexyl methacrylate, or butadiene.

[0014] Furthermore, the second monomer is one or more of styrene, methyl methacrylate, methyl acrylate, vinyl acetate, acrylonitrile, methacrylic acid, acrylic acid, or acrylamide.

[0015] Further, the emulsifier is one or more of AEO-7, AEO-9, OP-10, SDS, polyethylene glycol 200-400, Tween-80, or polyvinyl alcohol 1799; the first initiator is one or more of potassium persulfate, ammonium persulfate, sodium persulfate, benzoyl peroxide, or cumene hydroperoxide composite ferrous ion polymer; the solvent is one or more of water, ethanol, or isopropanol. The amount of emulsifier used with the first monomer is 1-10 wt% of the mass of the first monomer. The amount of the first initiator is 1-5 wt% of the mass of the first monomer.

[0016] Furthermore, the emulsifier is one or more of AEO-7, AEO-9, OP-10, SDS, polyethylene glycol 200-400, Tween-80, or polyvinyl alcohol 1799; the second initiator is one or more of potassium persulfate, ammonium persulfate, sodium persulfate, benzoyl peroxide, or cumene hydroperoxide composite ferrous ion polymer; the solvent is one or more of water, ethanol, or isopropanol. The amount of emulsifier used in the second monomer is 1-10 wt% of the mass of the second monomer. The amount of the second initiator is 0.5-2 wt% of the mass of the second monomer.

[0017] Furthermore, the water-based polymeric adhesive contains polar functional groups, which are one or more of hydroxyl, carboxyl, ester, amide, and nitrile groups; the water-based polymeric adhesive is one or a combination of two or more of polyacrylic acid, polyacrylic acid-isooctyl acrylate copolymer, polyacrylic acid-acrylonitrile copolymer, carboxylated modified polyacrylamide, or carboxylated modified polystyrene-butadiene copolymer.

[0018] The suspension stabilizer is one or a combination of two or more of polyvinyl alcohol, sodium carboxymethyl cellulose, polyvinylpyrrolidone, gelatin, alginate, or PEG-150. The suspension stabilizer can form intermolecular forces with the high-adhesion polymer dispersion, increase the viscosity of the slurry, prevent polymer particle sedimentation, and ensure the stable and uniform properties of the slurry.

[0019] Furthermore, the additive is one or more of the following: fatty alcohol polyoxyethylene ether AEO-7, fatty alcohol polyoxyethylene ether AEO-9, polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether, polyoxyethylene polyoxypropylene block copolymer, modified polyorganosiloxane, or acetylenol ethoxy compound. The additive primarily improves the wetting and leveling properties of the high-adhesion polymer slurry on the base film surface, and preferably is a nonionic surfactant with good stability.

[0020] Furthermore, the slurry solvent is one or a combination of two or more of water, ethanol, isopropanol, or dimethyl carbonate.

[0021] Furthermore, the preparation method of the high-adhesion polymer dispersion includes the following steps:

[0022] 1) The first monomer is pre-emulsified with an emulsifier and a solvent is added to form a first monomer emulsion with a concentration of 20-70%; the second monomer is pre-emulsified with an emulsifier and a solvent is added to form a second monomer emulsion with a concentration of 20-70%; the first monomer emulsion is added dropwise to a first initiator solution with a concentration of 0.5-5%, and reacted at 60-90°C for 0.5-3 hours to obtain a core layer emulsion;

[0023] 2) Add the second initiator solution with a concentration of 0.5-5% to the core layer emulsion obtained in step 1), and then add the second monomer emulsion obtained in step 1) dropwise. React at 60-90°C for 1-3 hours. After cooling to 20-40°C, a high-adhesion polymer dispersion in emulsion form is obtained.

[0024] The second objective of this invention is achieved by the following technical solution:

[0025] A method for preparing a high-adhesion polymer-coated separator includes the following steps: adding an aqueous polymeric adhesive, a suspending stabilizer, and additives to a high-adhesion polymer dispersion, stirring thoroughly to obtain a high-adhesion polymer slurry; coating the high-adhesion polymer slurry onto one or both sides of a base membrane, then drying, winding, and packaging to obtain the high-adhesion polymer-coated separator. The coating method can be dip coating, roll coating, or extrusion coating. The base membrane is a PE-based lithium-ion battery separator produced by a wet process, with a thickness of 5-16 μm and a porosity of 35-50%.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] (1) The high-adhesion polymer slurry used in the high-adhesion polymer coating separator of the present invention includes a high-adhesion polymer dispersion, an aqueous polymer adhesive, a suspension stabilizer, an additive, and a solvent; wherein, the high-adhesion polymer dispersion contains high-adhesion polymer particles with a core-shell structure, which is formed by a combination of an inner soft (soft core monomer) and an outer hard (hard shell monomer). The shell can locally swell in the electrolyte environment to bond the separator to the positive and negative electrodes. The unique core-shell structure makes the high-adhesion polymer particles easy to disperse, uniformly dispersed in the solvent, and have good stability. Therefore, the high-adhesion polymer coating separator made from the high-adhesion polymer slurry containing high-adhesion polymer particles is suitable for preparing batteries using wet pressing (electrolyte + temperature + pressure) and / or dry pressing (temperature + pressure) battery processes. It has the advantages of good compatibility, wide applicability, and excellent battery performance. After being made into a battery, it has the advantages of mild hot pressing formation conditions and excellent adhesion. Using the high-adhesion polymer coating separator of the present invention can also ensure good battery hardness and long cycle life of the soft pack battery.

[0028] (2) The high-adhesion polymer particles in the high-adhesion polymer dispersion have a suitable particle size and are not easy to clog the membrane micropores; moderate electrolyte swelling degree and excellent long-term electrolyte stability; the high-adhesion polymer particle material can replace the polymer material of PVDF. The coating amount of the slurry made with the dispersion containing high-adhesion polymer particles is 0.2-0.5 g / m² and the film thickness is within 1 μm. Compared with the coating amount of the traditional PVDF coating of 0.85-1.5 g / m² and the film thickness of 1.5-5 μm, the coating thickness and basis weight are significantly reduced, but the peel strength is higher, that is, the electrode adhesion can be better.

[0029] (3) The preparation method of the high-adhesion polymer coating membrane is simple and applicable to large-scale continuous production. Detailed Implementation

[0030] The present invention will now be further described in conjunction with specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0031] Example 1

[0032] The high-adhesion polymer slurry consists of: a high-adhesion polymer dispersion and an aqueous polymer adhesive, using 15g of polyacrylic acid-acrylonitrile copolymer. A 2g polyvinylpyrrolidone suspension stabilizer is used. A 1g fatty alcohol polyoxyethylene ether (AEO-7) is used as the additive (wetting agent).

[0033] Formulation of high-adhesion polymer dispersions:

[0034] First monomer emulsion: The first monomer (40g n-butyl acrylate and 60g isooctyl acrylate) was added to the emulsifier (2g SDS) and then to the solvent (50g ethanol) to form a first monomer emulsion with a concentration of 65.8%. The first initiator solution was a 1.3% solution formed by dissolving the first initiator (2g potassium persulfate) in the solvent (150g water).

[0035] The second monomer emulsion was prepared by adding the second monomer (80g styrene and 40g methyl methacrylate) to an emulsifier (2g Tween-80) followed by a solvent (70g ethanol) to form a second monomer emulsion with a concentration of 62.5%. The second initiator solution was prepared by dissolving the second initiator (1g potassium persulfate) in a solvent (180g water) to form a solution with a concentration of 0.55%.

[0036] The preparation method of the high-adhesion polymer dispersion includes the following steps:

[0037] 1) The pre-emulsified first monomer emulsion was added dropwise to the first initiator solution in a semi-continuous state, and the reaction was carried out at 60°C for 3 hours to obtain a white core layer emulsion.

[0038] 2) Add the second initiator solution to the core layer emulsion obtained in step 1), then add the pre-emulsified second monomer emulsion dropwise, react at 90°C for 1 hour, and then cool down to 40°C to obtain emulsion-like high-adhesion polymer particles.

[0039] The preparation method of the high-adhesion polymer coating slurry includes the following steps: adding water-based polymer glue, suspension stabilizer and additives to a high-adhesion polymer dispersion, stirring thoroughly to obtain a high-adhesion polymer slurry.

[0040] Example 2

[0041] The high-adhesion polymer slurry consists of: a high-adhesion polymer dispersion; 22g of polyacrylic acid (by weight); 10g of polyvinyl alcohol as a suspension stabilizer; and 4g of fatty alcohol polyoxyethylene ether AEO-9 as a wetting agent.

[0042] The formulation of the high-adhesion polymer dispersion is as follows:

[0043] First monomer emulsion: The first monomer (80g ethyl acrylate) is added to the emulsifier (1g OP-10) and then to the solvent (60g water) to form a first monomer emulsion with a concentration of 56.7%. The first initiator solution is a 6.3% solution formed by dissolving the first initiator (4g sodium sulfate) in the solvent (60g water).

[0044] Second monomer emulsion: The second monomer (140g methyl methacrylate) was added to the emulsifier (1.4g polyethylene glycol 400), followed by the addition of solvent (210g water) to form a second monomer emulsion with a concentration of 39.8%. The second initiator solution was a 1.18% solution formed by dissolving the second initiator (2.5g sodium persulfate) in solvent (210g water).

[0045] The preparation method of the high-adhesion polymer dispersion includes the following steps:

[0046] 1) The pre-emulsified first monomer emulsion was added dropwise to the first initiator solution in a semi-continuous state, and the reaction was carried out at 90°C for 1 hour to obtain a white core layer emulsion;

[0047] 2) Add the second initiator solution to the core layer emulsion obtained in step 1), then add the pre-emulsified second monomer emulsion dropwise, react at 90°C for 1 hour, and then cool down to 40°C to obtain an emulsion-like high-adhesion polymer dispersion.

[0048] The preparation method of the high-adhesion polymer coating slurry includes the following steps: adding water-based polymer glue, suspension stabilizer and additives to a high-adhesion polymer dispersion, stirring thoroughly to obtain a high-adhesion polymer slurry.

[0049] Example 3

[0050] The high-adhesion polymer slurry consists of: a high-adhesion polymer dispersion and a polymer adhesive containing 10.5g of polycarboxylated modified polyacrylamide. The suspension stabilizer is 4.2g of sodium carboxymethyl cellulose. The auxiliary agent (wetting agent) is 1g of modified polysiloxane.

[0051] The formulation of the high-adhesion polymer dispersion is as follows:

[0052] First monomer emulsion: The first monomer (100g isooctyl acrylate) is added to the emulsifier (5g AEO-9) and then to the solvent (200g water) to form a first monomer emulsion with a concentration of 32.8%. The first initiator solution is a 2.4% solution formed by dissolving the first initiator (5g ammonium sulfate) in the solvent (200g water).

[0053] Second monomer emulsion: The second monomer (110g methyl acrylate) is added to the emulsifier (5g polyethylene glycol 200), followed by the addition of solvent (220g water) to form a second monomer emulsion with a concentration of 32.8%. The second initiator solution is a 0.9% solution formed by dissolving the second initiator (2g ammonium sulfate) in solvent (220g water).

[0054] The slurry preparation method in Example 3 is the same as that in Example 1.

[0055] The difference between Comparative Example 1 and Example 1 is that no water-based polymer adhesive is added, while the remaining components and preparation methods are the same as in Example 1.

[0056] Comparative Example 2

[0057] The difference between Comparative Example 2 and Example 1 is that no suspension stabilizer was added, while the remaining components and preparation methods are the same as in Example 1.

[0058] Comparative Example 3

[0059] The difference between Comparative Example 3 and Example 1 is that no additive (wetting agent) is added, while the remaining components and preparation methods are the same as in Example 1.

[0060] Comparative Example 4

[0061] The difference between Comparative Example 4 and Example 2 is that ethyl acrylate is used as the second monomer and methyl methacrylate is used as the first monomer, while the remaining components and preparation methods are the same as in Example 2.

[0062] Performance testing

[0063] The slurries from Examples 1-3 and Comparative Examples 1-4 were coated onto one side of the corresponding base membranes and dried to form separators. All base membranes were PE-based lithium-ion battery separators produced by a wet process, with a thickness of 13 μm and a porosity of 45%. The above six sets of lithium battery separators were then used to fabricate lithium-ion batteries.

[0064] The thickness, air permeability, peel strength, and tensile strength of the high-adhesion polymer-coated separators of Examples 1-3 and Comparative Examples 1-4 were measured. After each group of separators was fabricated into a battery, the battery resistance and cycle parameters were measured. Specifically, the peel strength and tensile strength were measured under wet pressure (electrolyte: EC / EMC = 3 / 7 (v / v), 1M LiPF6, VC 2%; temperature 60°C, pressure 1.0 MPa) and dry pressure (temperature 70°C + pressure 1.5 MPa). The data are shown in Table 1.

[0065] Table 1. Test results of the high-adhesion polymer-coated separators of Examples 1-3 and Comparative Examples 1-4.

[0066]

[0067] As shown in Table 1, the wet pressure peel strength and dry pressure peel strength of the separators made from the slurries of Examples 1-3 are higher than those of Comparative Examples 1-4, indicating that the separators of Examples 1-3 can simultaneously meet the requirements of both wet pressure (electrolyte + temperature + pressure) and dry pressure (temperature + pressure) battery processes, demonstrating good compatibility. After using the separators of Examples 1-3 to manufacture batteries, the capacity retention rate (%) after a conventional 500-cycle test is higher than that of Comparative Examples 1-4, indicating that the separators of Examples 1-3 can ensure good battery hardness and long cycle life for pouch batteries.

[0068] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A high adhesion polymer coating separator characterized in that, The product includes a base film, at least one surface of which is coated with a high-adhesion polymer slurry to form a coating layer having a high-adhesion polymer, wherein the high-adhesion polymer slurry includes a high-adhesion polymer dispersion, an aqueous polymeric adhesive, a suspension stabilizer, an additive, and a slurry solvent; The high-adhesion polymer dispersion includes an emulsifier, a solvent, and high-adhesion polymer particles with a core-shell structure. The core-shell structure is formed by a polymer formed by a first monomer and a first initiator as the core layer and a polymer formed by a second monomer and a second initiator as the shell layer. The polymer formed by the first monomer and the first initiator has a glass transition temperature of -70℃ < Tg < 0℃, and the polymer formed by the second monomer and the second initiator has a glass transition temperature of 0℃ < Tg < 200℃. The first monomer of the core-shell structure reacts with the first initiator to form core layer particles, and the second monomer reacts with the second initiator around the core layer particles to form larger particles, forming a shell layer, and finally forming high-adhesion polymer particles. The emulsifier is used to pre-emulsify the first monomer and the second monomer to form the first monomer emulsion and the second monomer emulsion, respectively. The solvent is used to dilute the first monomer emulsion and the second monomer emulsion. The first monomer is one or more of ethyl acrylate, isooctyl acrylate, 2-hydroxyethyl acrylate, hexyl methacrylate or butadiene; The second monomer is one or more of methyl acrylate, vinyl acetate, or acrylamide; The mass ratio of the first monomer to the second monomer is 1:1.1 to 1.8, and the particle size formed by the combination of the core layer formed by the first monomer and the shell layer formed by the second monomer is 200 to 600 nm. The water-based polymer adhesive contains polar functional groups, which are one or more of hydroxyl, carboxyl, ester, amide, and nitrile groups; the water-based polymer adhesive is one or a combination of two or more of polyacrylic acid, polyacrylic acid-isooctyl acrylate copolymer, polyacrylic acid-acrylonitrile copolymer, carboxylated modified polyacrylamide, or carboxylated modified polystyrene-butadiene copolymer; the suspension stabilizer is one or a combination of two or more of polyvinyl alcohol, sodium carboxymethyl cellulose, polyvinylpyrrolidone, gelatin, alginate, or PEG-150. The additive is one or more of the following: fatty alcohol polyoxyethylene ether AEO-7, fatty alcohol polyoxyethylene ether AEO-9, polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether, polyoxyethylene polyoxypropylene block copolymer, modified polyorganosiloxane, or acetylenol ethoxy compound.

2. The high adhesion polymeric coating separator of claim 1, wherein, The emulsifier is one or more of AEO-7, AEO-9, OP-10, SDS, polyethylene glycol 200-400, Tween-80, or polyvinyl alcohol 1799; the first initiator is one or more of potassium persulfate, ammonium persulfate, sodium persulfate, benzoyl peroxide, or cumene hydroperoxide composite ferrous ion polymer; and the solvent is one or more of water, ethanol, or isopropanol.

3. The high adhesion polymeric coating separator of claim 1, wherein The emulsifier is one or more of AEO-7, AEO-9, OP-10, SDS, polyethylene glycol 200-400, Tween-80, or polyvinyl alcohol 1799; the second initiator is one or more of potassium persulfate, ammonium persulfate, sodium persulfate, benzoyl peroxide, or cumene hydroperoxide composite ferrous ion polymer; and the solvent is one or more of water, ethanol, or isopropanol.

4. The high adhesion polymeric coating separator of claim 1, wherein The slurry solvent is one or a combination of two or more of water, ethanol, isopropanol or dimethyl carbonate.

5. The high adhesion polymeric coating separator of claim 1, wherein The preparation method of the high-adhesion polymer dispersion includes the following steps: 1) The first monomer is pre-emulsified with an emulsifier and then a solvent is added to form a first monomer emulsion with a mass concentration of 20-70%; The second monomer is pre-emulsified with an emulsifier and then a solvent is added to form a second monomer emulsion with a mass concentration of 20-70%. The first monomer emulsion is then added dropwise to a first initiator solution with a mass concentration of 0.5-5% and reacted at 60-90°C for 0.5-3 hours to obtain a core layer emulsion. 2) Add a second initiator solution with a mass concentration of 0.5-5% to the core layer emulsion obtained in step 1), and then add the second monomer emulsion obtained in step 1) dropwise. React at 60-90℃ for 1-3 hours. After cooling to 20-40℃, a high-adhesion polymer dispersion in emulsion form is obtained.

6. The process for the production of high adhesion polymeric coating separator according to any one of claims 1 to 5, characterized in that, Includes the following steps: Aqueous polymeric adhesive, suspension stabilizer, and additives are added to a high-adhesion polymer dispersion and stirred thoroughly to obtain the high-adhesion polymer slurry. The high-adhesion polymer slurry is coated on one or both sides of the base film, and then dried, wound, and packaged to obtain a high-adhesion polymer coated diaphragm.

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