Electrospinning polyether sulphone diaphragm and preparation method and application thereof

Abstract

The invention discloses an electrospinning polyether sulphone diaphragm as well as a preparation method and application thereof. The electrospinning polyether sulphone diaphragm is obtained by electrostatic spinning of a spinning solution containing a polyether sulphone polymer. The electrospun polyether sulphone diaphragm prepared by the invention has better wettability, high liquid absorption rate, high ionic conductivity, high electrochemical window and good long cycle stability. The electrospinning polyether sulphone diaphragm prepared by the invention has very wide development and utilization prospects in the field of high-performance batteries.

Description

Technical Field

[0001] This application relates to an electrospun polyarylethersulfone diaphragm, its preparation method, and its application, belonging to the field of materials technology. Background Technology

[0002] Currently, commercially available lithium-ion battery separators are mainly made of polyolefins, including polyethylene and polystyrene. However, these separators suffer from problems such as low porosity, poor electrolyte wettability leading to low ionic conductivity, and a narrow electrochemical window, which limit the battery's cycle stability and high-rate charge-discharge performance. As market demands for power battery performance continue to increase, higher requirements are being placed on the ionic conductivity of separators. Developing separator materials with high porosity and high conductivity through molecular structure design and physical modification is an important research topic.

[0003] Polyarylene ether sulfone is a type of special engineering material with high heat resistance, flame retardancy, impact resistance, creep resistance, radiation resistance, and excellent dimensional stability. It has a wide range of applications in high-tech fields such as aerospace, military technology, and energy, and has become a research hotspot in the field of polymer materials.

[0004] Currently, the poor solubility of high molecular weight polyarylether sulfones limits large-scale processing. Summary of the Invention

[0005] To address the problems existing in the above-mentioned prior art, the technical problems that need to be solved are to prepare a polyarylene ether sulfone resin with good solubility and high temperature resistance, and to prepare a membrane with high porosity and high ionic conductivity by electrospinning.

[0006] The purpose of this invention is to provide a type of high-conductivity electrospun polyarylether sulfone membrane and its preparation method. The polyarylether sulfone resin provided by this invention has good solubility in solvents and high molecular weight. The electrospun polyarylether sulfone membrane provided by this invention has high porosity, high wettability, high ionic conductivity, and a wide electrochemical window.

[0007] According to one aspect of this application, an electrospun polyarylethersulfone separator is provided, which is obtained by electrospinning with a spinning solution containing a polyarylethersulfone polymer.

[0008] The polyarylene ether sulfone polymer has the structure shown in Formula I:

[0009]

[0010] In Formula I, 10 ≤ n ≤ 500, where n is an integer, and 0 ≤ m ≤ 5, where m is an integer;

[0011] Wherein, R is a bisphenol compound, and the bisphenol compound is selected from one of the structures shown in Formula I-1, Formula I-2, Formula I-3, Formula I-4, Formula I-5, Formula I-6, Formula I-7, and Formula I-8;

[0012]

[0013] Optionally, the liquid absorption rate of the electrospun polyarylethersulfone diaphragm is 150% to 400%.

[0014] Optionally, the porosity of the electrospun polyarylethersulfone membrane is 70% to 90%.

[0015] Optionally, the electrospun polyarylethersulfone membrane has an ionic conductivity of 1.4–2.4 mS / cm. -1 .

[0016] According to another aspect of this application, a method for preparing the electrospun polyarylene ether sulfone membrane described above is provided, the method comprising the following steps:

[0017] (1) A mixture containing polyarylether sulfone polymer and solvent is mixed to obtain a spinning solution;

[0018] (2) The spinning solution is sprayed into a film by electrospinning and dried to obtain the electrospun polyarylether sulfone membrane.

[0019] Optionally, in step (2), the electrospinning conditions are: the voltage difference between the positive and negative electrodes is 5kV to 20kV.

[0020] Optionally, in step (2), the electrospinning conditions of the electrospinning method are: the positive and negative electrode voltage difference of the spinning is independently selected from any value of 5kV, 8kV, 10kV, 12kV, 15kV, 20kV or any range between the above two.

[0021] Optionally, the speed of the translation motor for spinning is 5 mm / s to 40 mm / s.

[0022] Optionally, the speed of the translation motor for spinning is independently selected from any value of 5 mm / s, 10 mm / s, 15 mm / s, 20 mm / s, 25 mm / s, 30 mm / s, 35 mm / s, 40 mm / s, or a range between any two of the above.

[0023] Optionally, the distance between the receiver of the spinning process and the receiver is 20cm to 40cm.

[0024] Optionally, the distance to the receiver of the spinneret is independently selected from any value of 20cm, 25cm, 30cm, 35cm, 40cm or a range between any two of the above.

[0025] Optionally, the spinning advance rate is 0.05 mL / h to 0.2 mL / h.

[0026] Optionally, the spinning advance rate is independently selected from any value among 0.05 mL / h, 0.1 mL / h, 0.15 mL / h, 0.2 mL / h, or a range between any two of the above.

[0027] Optionally, the spinneret rotation speed is 100 rpm to 400 rpm.

[0028] Optionally, the spinneret rotation speed is independently selected from any value among 100 rpm, 200 rpm, 300 rpm, and 400 rpm, or a range between any two of the above.

[0029] Optionally, the spinning time is 300 min to 600 min.

[0030] Optionally, the spinning time is independently selected from any value of 300 min, 350 min, 400 min, 450 min, 500 min, 550 min, 600 min, or a range between any two of the above.

[0031] Optionally, in step (1), the mass ratio of the polyarylether sulfone polymer to the solvent is 1:1 to 1:6.

[0032] Optionally, the solvent is selected from at least one of N,N-dimethylformamide, N,N-dimethylacetamide, tetrahydrofuran, N-methylpyrrolidone, dimethyl sulfoxide, and triethyl phosphate.

[0033] Optionally, in step (1), the preparation method of the polyarylether sulfone polymer includes:

[0034] A mixture containing bisphenol compounds, dihalogenated diphenyl sulfone derivatives, a catalyst, a dehydrating agent, and solvent I is reacted to obtain the polyarylether sulfone polymer.

[0035] Optionally, the bisphenol compound is selected from at least one of phenolphthalein, 3,3-bis(4-hydroxyphenyl)-2-phenylprop-1-one, phenolphthalein, 9,9'-bis(4-hydroxyphenyl)fluorene, 3,3'-diisopropylphenolphthalein, 3,3'-dimethylphenolphthalein, 2′,5′,2″,5″-tetramethylphenolphthalein, and thymolphthalein.

[0036] Optionally, the molar ratio of the bisphenol compound to the dihalodiphenyl sulfone derivative is 0.83 to 1.0:1.

[0037] Optionally, the dihalodiphenyl sulfone derivative has the structure shown in Formula II:

[0038]

[0039] In Formula II, X is selected from any one of F, Cl, Br, and I;

[0040] 0 ≤ m ≤ 5, where m is an integer.

[0041] Optionally, the molar ratio of the bisphenol compound to the catalyst is 0.2 to 0.4:1.

[0042] Optionally, the molar volume ratio of the bisphenol compound, the dehydrating agent, and solvent I is: 0.01-0.02 mol: 15-40 mL: 10-40 mL.

[0043] Optionally, the catalyst is selected from at least one of potassium carbonate, sodium carbonate, sodium bicarbonate, and calcium carbonate.

[0044] Optionally, the dehydrating agent is selected from at least one of toluene, xylene, chlorobenzene, and 1,2-dichlorobenzene.

[0045] Optionally, the solvent I is selected from at least one of N-methylpyrrolidone, N-cyclohexylpyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, sulfolane, dimethylimidazolium, and diphenyl sulfone.

[0046] Optionally, the reaction temperature is 100–230°C, and the reaction time is 2–24 h.

[0047] Optionally, the reaction temperature is 150–200°C, and the reaction time is 3–10 h.

[0048] According to another aspect of this application, an application of the electrospun polyarylethersulfone separator described above in the field of high-performance batteries is provided.

[0049] As an optional implementation, this application is achieved through the following technical solution:

[0050] The preparation method of the dihalogenated diphenyl sulfone derivative includes the following steps:

[0051] (1) A mixture containing p-fluorobenzaldehyde, trimethylcyanosilane, morpholine and solvent II is reacted with reaction I to obtain intermediate 1;

[0052] (2) A mixture containing intermediate 1, dihalodiphenyl sulfone, catalyst I and solvent III is reacted with reaction II to obtain intermediate 2;

[0053] (3) A mixture containing intermediate 2, catalyst II and solvent IV is reacted with reaction III to obtain the dihalogenated diphenyl sulfone derivative;

[0054]

[0055] The intermediate 1 has the structure shown in Formula III;

[0056] The intermediate 2 has the structure shown in Formula IV;

[0057] In Formula IV, X is selected from any one of F, Cl, Br, and I.

[0058] Optionally, the preparation method of the dihalogenated diphenyl sulfone derivative includes the following steps:

[0059] (1) The Strecker reaction of p-fluorobenzaldehyde, trimethylcyanosilane and morpholine yields intermediate 1;

[0060] (2) A mixture containing intermediate 1, dihalodiphenyl sulfone, catalyst and solvent is subjected to a nucleophilic reaction to obtain intermediate 2;

[0061] (3) An oxidation reaction is carried out on a mixture containing intermediate 2 and a catalyst to obtain a dihalogen compound as shown in Formula II, wherein m = 1;

[0062] (4) By repeating the above steps, dihalogen compounds in which m is an integer greater than or equal to 2 can be obtained.

[0063] Optionally, in step (1), the molar ratio of p-fluorobenzaldehyde, trimethylcyanosilane, and morpholine is 1:1:1 to 1:3:3.

[0064] Optionally, solvent II is selected from at least one of ethanol, methanol, isopropanol, and trifluoroethanol.

[0065] Optionally, solvent II is selected from ethanol.

[0066] Optionally, the molar volume ratio of p-fluorobenzaldehyde to solvent II is 0.05–0.1 mol: 30–90 mL.

[0067] Optionally, the temperature of reaction I is 50–90°C, and the reaction time is 8–24 h.

[0068] Optionally, the temperature of reaction I is selected from any value of 50°C, 60°C, 70°C, 80°C, 90°C, or a range between any two of the above.

[0069] Optionally, the reaction time of the reaction I is selected from any value of 8h, 12h, 16h, 20h, 24h or a range between any two of the above.

[0070] Optionally, the temperature of reaction I is 60–80°C, and the reaction time is 12–20 h.

[0071] Optionally, in step (2), the molar ratio of intermediate 1 to dihalodiphenyl sulfone is 2:1 to 4:1.

[0072] Optionally, the molar ratio of intermediate 1 to catalyst I is 1:1 to 1:4.

[0073] Optionally, the molar volume ratio of intermediate 1 to solvent III is 0.01–0.02 mol: 30–80 mL.

[0074] Optionally, the dihalodiphenyl sulfone is selected from at least one of difluorodiphenyl sulfone, dichlorodiphenyl sulfone, dibromodiphenyl sulfone, and diiododiphenyl sulfone.

[0075] Optionally, the catalyst I is selected from at least one of sodium hydride, tert-butyllithium, n-butyllithium, and potassium tert-butoxide.

[0076] Optionally, the catalyst I is sodium hydride.

[0077] Optionally, solvent III is selected from at least one of N,N-dimethylformamide, N,N-dimethylacetamide, tetrahydrofuran, and dimethyl sulfoxide.

[0078] Optionally, solvent III is tetrahydrofuran.

[0079] Optionally, the temperature of reaction II is 10–100°C, and the reaction time is 8–96 h.

[0080] Optionally, the temperature of reaction II is selected from any value of 10°C, 50°C, 60°C, 70°C, 80°C, 90°C, 100°C, or a range between any two of the above.

[0081] Optionally, the reaction time II is selected from any value of 8h, 12h, 16h, 20h, 24h, 36h, 56h, 72h, 80h, 96h or a range between any two of the above.

[0082] Optionally, the temperature of reaction II is 20–80°C, and the reaction time is 12–72 h.

[0083] Optionally, in step (3), the catalyst II is selected from at least one of acetic acid, sulfuric acid, and phosphoric acid.

[0084] Optionally, the molar ratio of intermediate 2 to catalyst II is 0.005 to 0.01.

[0085] Optionally, the molar volume ratio of intermediate 2 to solvent IV is 0.01–0.02 mol: 6–20 mL.

[0086] Optionally, solvent IV is an aqueous solution of acetic acid, with a mass fraction of acetic acid of 40 wt% to 80 wt%.

[0087] Optionally, solvent IV is an aqueous solution of acetic acid, with a mass fraction of 60 wt% to 70 wt%.

[0088] Optionally, the temperature of reaction III is 80–140°C, and the reaction time is 5–60 min.

[0089] Optionally, the temperature of reaction III is selected from any value among 80°C, 90°C, 100°C, and 110°C, or a range between any two of the above.

[0090] Optionally, the reaction time of reaction III is selected from any value of 5 min, 15 min, 30 min, 45 min, 60 min, or a range between any two of the above.

[0091] Optionally, the temperature of reaction III is 90–110°C, and the reaction time is 15–30 min.

[0092] In this application, the preparation method of polyarylether sulfone membrane includes: (1) mixing, filtering and degassing polyarylether sulfone polymer and solvent to obtain a mixture; (2) using an electrospinning machine to spray the mixture into a film and drying it to obtain the electrospun polyarylether sulfone membrane material with high ionic conductivity.

[0093] The beneficial effects that this application can produce include:

[0094] 1) The raw materials provided in this application are commercial products. The preparation method of polyarylene ether sulfone polymer is simple, has a high yield, and the synthesis method is universal. Phenolphthalein, bisphenol fluorene, phenolphthalein, and 3,3-bis(4-hydroxyphenyl)-2-phenylprop-1-one in this application have conjugated and twisted structural characteristics. The skeleton has a certain rigidity, while having sterically hindered side groups, which makes the polyarylene ether sulfone main chain structure highly rigid; it has high temperature resistance, and the side groups can improve the solubility and electrophilicity of polyarylene ether sulfone resin. It can be dissolved in chloroform, dichloromethane and other haloalkanes and N-methylpyrrolidone, dimethyl sulfoxide and other aprotic solvents at room temperature. After heating, it can be dissolved in N,N-dimethylformamide, N,N-dimethylacetamide and other aprotic polar solvents, which improves processability.

[0095] 2) The electrospun polyarylether sulfone diaphragm provided in this application is prepared by electrospinning, which is simple, has controllable conditions, and is easy to prepare on a large scale.

[0096] 3) The electrospun polyarylethersulfone diaphragm provided in this application has a porosity of 80%, a liquid absorption rate of 400%, an electrochemical window of 4.5V, and a maximum ionic conductivity of 2.32 mS / cm. -1 It can be applied to the field of high-performance batteries. Attached Figure Description

[0097] Figure 1 This is the hydrogen NMR spectrum of intermediate 1 in Example 1 of this application.

[0098] Figure 2 This is the 1H NMR spectrum of intermediate 2 in Example 1 of this application.

[0099] Figure 3 This is the 1H NMR spectrum of the dihalogen compound I in Example 1 of this application.

[0100] Figure 4 This is the mass spectrum of dihalogen compound I in Example 1 of this application.

[0101] Figure 5 The image shows the 1H NMR spectrum of the electrospun polyarylene ether sulfone membrane I-1 in Example 1 of this application.

[0102] Figure 6 This is an electron microscope image of the electrospun polyarylether sulfone diaphragm I-1 in Example 1 of this application. The scale bar is 5 μm.

[0103] Figure 7 This is a contact angle diagram of the electrospun polyarylether sulfone diaphragm I-1 in Example 1 of this application.

[0104] Figure 8 The image shows the 1H NMR spectrum of the electrospun polyarylene ether sulfone membrane II-1 in Example 4 of this application.

[0105] Figure 9 This is an electron microscope image of the electrospun polyarylether sulfone diaphragm II-1 in Example 4 of this application. The scale bar is 5 μm.

[0106] Figure 10 This is a contact angle diagram of the electrospun polyarylether sulfone diaphragm II-1 in Example 4 of this application.

[0107] Figure 11 The image shows the 1H NMR spectrum of the electrospun polyarylene ether sulfone membrane IV-1 in Example 11 of this application.

[0108] Figure 12 This is an electron microscope image of the electrospun polyarylethersulfone separator IV-1 in Example 11 of this application. The scale bar is 6 μm.

[0109] Figure 13 This is a contact angle diagram of the electrospun polyarylether sulfone diaphragm IV-1 in Example 11 of this application.

[0110] Figure 14 This is a contact angle diagram for comparison with this application.

[0111] Figure 15 This is a graph showing the discharge capacity and coulombic efficiency of the battery after 100 cycles at 0.5C in Example 1 of this application.

[0112] Figure 16 This is a graph showing the discharge capacity and coulombic efficiency of the battery after 100 cycles at 0.5C in Example 4 of this application.

[0113] Figure 17 This is a graph showing the discharge capacity and coulombic efficiency of the battery after 100 cycles at 0.5C in Example 11 of this application.

[0114] Figure 18 The diagram shows the discharge capacity and coulombic efficiency of the battery at 0.5C after 100 cycles in the comparative example of this application. Detailed Implementation

[0115] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0116] Unless otherwise specified, all raw materials used in the embodiments of this application were purchased through commercial channels.

[0117] In the embodiments of this application, the prepared intermediates, dihalogen compounds, polyarylether sulfone resins, and diaphragms were characterized using the following instruments:

[0118] The intermediates and dihalogen compounds obtained were analyzed using a Bruker AVANCE III HD 400MHz nuclear magnetic resonance spectrometer. 1 The 1H NMR spectrum was obtained by dissolving 10 mg of sample in deuterated chloroform solvent and performing 16 1H NMR scans.

[0119] The scanning electron microscope (SEM) characterization was performed using a SEM6900 instrument from CAS Instruments.

[0120] Example 1: Preparation of electrospun polyarylene ether sulfone membrane I-1

[0121] The synthesis route is shown in the following formula:

[0122]

[0123] p-Fluorobenzaldehyde (12.41 g, 0.1 mol, 1.0 equiv.), trimethylcyanosilane (9.92 g, 0.1 mol, 1.0 equiv.), and morpholine (8.71 g, 0.1 mol, 1.0 equiv.) were added to a 250 mL three-necked flask, and anhydrous ethanol (60 mL) was added. The mixture was heated to 60 °C and refluxed with stirring for 12 hours. The reaction was then stopped, cooled to room temperature, evaporated to dryness, and purified by column chromatography using petroleum ether / ethyl acetate-10 / 1 as the mobile phase, yielding a white solid intermediate 1 (9.1 g, yield 84.2%). Figure 1 The image shows the 1H NMR spectrum of intermediate 1. 1H NMR (400MHz, CDCl3) δ7.58-7.45(m,2H),7.15-7.03(m,2H),4.78(s,1H),3.80-3.62(m,4H),2.56(t,J=4.8Hz,4H).

[0124] Intermediate 1 (4.84 g, 22 mmol, 2.2 equiv.) and dichlorodiphenyl sulfone (2.87 g, 10 mmol, 1.0 equiv.) were added to a 100 mL three-necked flask. Under nitrogen protection, anhydrous tetrahydrofuran (30 mL) was added, and the mixture was stirred until dissolved. Then, sodium hydride (60%, 0.96 g, 24 mmol, 2.4 equiv.) was added, and the mixture was heated to 65 °C and refluxed with stirring for 72 hours. After cooling to room temperature, the reaction was quenched with water (10 mL), and the solution was evaporated to dryness. The solution was then purified by column chromatography using petroleum ether / ethyl acetate-2 / 1 as the mobile phase to give a pale yellow solid intermediate 2 (6.0 g, 92% yield). Figure 2 The image shows the 1H NMR spectrum of intermediate 2. 1 H NMR (400MHz, CDCl3) δ7.88 (d, J = 8.4Hz, 4H), 7.80 (d, J = 8.4Hz, 4H), 7.62-7.56 (m, 4H), 7.06-6.99 (m, 4H), 3.75 (t, J = 4.4Hz, 8H), 2.59-2.41 (m, 8H).

[0125] Intermediate 2 (6.0 g, 9.16 mmol) and an aqueous solution of acetic acid (70 wt%, 75 mL) were added to a 250 mL three-necked flask. The mixture was heated to 105 °C and refluxed with stirring for 20 minutes. After cooling to room temperature, the mixture was poured into ice water and washed three times with 30 mL of water each time. After drying, the mixture was recrystallized from toluene to give a white solid dihalogen compound I (4.2 g, 99% yield). Figure 3 The image shows the 1H NMR spectrum of dihalogen compound I. Figure 4 This is the mass spectrum of dihalogen compound I. 1 H NMR (400MHz, CDCl3) δ8.10 (d, J = 8.4Hz, 4H), 7.88 (d, J = 8.4Hz, 4H), 7.85-7.79 (m, 4H), 7.18 (t, J = 8.8Hz, 4H). HR-ESI-MS calcd.forC 26 H 17 F2O4S[M+H] + :463.0816; found:463.0814.

[0126] In a 100 mL three-necked round-bottom flask, dihalogen compound I (4.62 g, 0.01 mol), phenolphthalein (3.18 g, 0.01 mol), potassium carbonate (1.590 g), sulfolane (12.5 g), and toluene (15 mL) were added sequentially. The mixture was heated to 150 °C and kept at that temperature for 2 hours. The mixture was then subjected to azeotropic dehydration. The toluene was removed by raising the temperature, and the mixture was further heated to 190 °C and reacted for 4.5 hours. The mixture was then heated to 205 °C and reacted for 2 hours. The mixture was cooled, and N,N-dimethylacetamide (10 mL) was added for dilution. The mixture was then precipitated in a mixed solution of ethanol and water. After filtration, the precipitate was extracted with deionized water in a Soxhlet extractor for 15 hours to remove inorganic salts and reaction solvent. The precipitate was dried to obtain a white solid, namely polyarylene ether sulfone I-1, where n was 103.

[0127] A white solid was dissolved in N,N-dimethylformamide solvent with a solid content of 20%. After filtration and vacuum degassing for 3 hours, a spinning solution was obtained. The voltage difference between the positive and negative electrodes during spinning was 20 kV; the speed of the translation motor was 40 mm / s; the distance between the receivers was 40 cm; the feed rate was 0.2 mL / h; the receiver rotation speed was 400 rpm; and the spinning time was 600 min. After drying, an electrospun polyarylene ether sulfone membrane I-1 was obtained.

[0128] Figure 5 The image shows the 1H NMR spectrum of electrospun polyarylethersulfone membrane I-1. Figure 6 Electron micrograph of electrospun polyarylether sulfone separator I-1. Figure 7 This is a contact angle diagram for electrospun polyarylethersulfone separator I-1. From... Figure 5 The peak positions correspond to the structure, confirming the polymer structure. Figure 6 The medium fiber is of uniform thickness and distribution. Figure 7 The contact angle of the Zhongdianspin polyarylether sulfone diaphragm I-1 is 26.41°, which is small and has good wettability.

[0129] Example 2 Preparation of electrospun polyarylene ether sulfone membrane I-2

[0130] In a 100 mL three-necked round-bottom flask, the dihalogen compound I (4.62 g, 0.01 mol), phenolphthalein (3.18 g, 0.01 mol), potassium carbonate (1.590 g), N-methylpyrrolidone (12.5 g), and xylene (15 mL) prepared in Example 1 were added sequentially. The mixture was heated to 150 °C and kept at that temperature for 2 hours. The mixture was then subjected to azeotropic dehydration. The xylene was removed by raising the temperature, and the mixture was further heated to 190 °C and reacted for 4.5 hours. The mixture was then heated to 205 °C and reacted for 2 hours. The mixture was cooled, and N,N-dimethylacetamide (10 mL) was added for dilution. The mixture was then precipitated in a mixed solution of ethanol and water. After filtration, the precipitate was extracted with deionized water in a Soxhlet extractor for 15 hours to remove inorganic salts and reaction solvent. The precipitate was dried to obtain a white solid, namely polyarylene ether sulfone I-2.

[0131] A white solid was dissolved in N,N-dimethylformamide solvent with a solid content of 20%. After filtration and vacuum degassing for 3 hours, a spinning solution was obtained. The voltage difference between the positive and negative electrodes during spinning was 5 kV; the speed of the translation motor was 5 mm / s; the distance between the receivers was 20 cm; the feed rate was 0.05 mL / h; the receiver rotation speed was 100 rpm; and the spinning time was 300 min. After drying, an electrospun polyarylene ether sulfone membrane I-2 was obtained.

[0132] Example 3 Preparation of electrospun polyarylene ether sulfone membrane I-3

[0133] In a 100 mL three-necked round-bottom flask, the dihalogen compound I (4.62 g, 0.01 mol), phenolphthalein (3.18 g, 0.01 mol), potassium carbonate (1.590 g), N-cyclohexylpyrrolidone (12.5 g), and 1,2-dichlorobenzene (15 mL) prepared in Example 1 were added sequentially. The mixture was heated to 150 °C and kept at that temperature for 2 hours. The mixture was then subjected to azeotropic dehydration. The 1,2-dichlorobenzene was removed by raising the temperature. The mixture was then heated to 190 °C and reacted for 4.5 hours. The mixture was then heated to 205 °C and reacted for 2 hours. The mixture was cooled and diluted with N,N-dimethylacetamide (10 mL). The precipitate was then precipitated in a mixed solution of ethanol and water. After filtration, the precipitate was extracted with deionized water in a Soxhlet extractor for 15 hours to remove inorganic salts and reaction solvent. The precipitate was dried to obtain a white solid, namely polyarylene ether sulfone I-3.

[0134] A white solid was dissolved in N-methylpyrrolidone solvent with a solid content of 20%. After filtration and vacuum degassing for 3 hours, a spinning solution was obtained. The voltage difference between the positive and negative electrodes during spinning was 10 kV; the speed of the translation motor was 12 mm / s; the distance between the receivers was 30 cm; the feed rate was 0.1 mL / h; the receiver rotation speed was 300 rpm; and the spinning time was 500 min. After drying, an electrospun polyarylene ether sulfone diaphragm I-3 was obtained.

[0135] Example 4: Preparation of electrospun polyarylethersulfone separator II-1

[0136] The structural formula is shown below:

[0137]

[0138] The structural formula of dihalogen compound II is as follows:

[0139]

[0140] In a 100 mL three-necked round-bottom flask, dihalogen compound II (6.70 g, 0.01 mol), phenolphthalein (3.18 g, 0.01 mol), potassium carbonate (1.590 g), N-methylpyrrolidone (12.5 g), and toluene (15 mL) were added sequentially. The mixture was heated to 150 °C and kept at that temperature for 2 hours. The mixture was then subjected to azeotropic dehydration. The toluene was removed by raising the temperature, and the mixture was further heated to 190 °C and reacted for 4.5 hours. The mixture was then heated to 205 °C and reacted for 2 hours. The mixture was cooled, and N,N-dimethylacetamide (10 mL) was added for dilution. The mixture was then precipitated in a mixture of ethanol and water. After filtration, the precipitate was extracted with deionized water in a Soxhlet extractor for 15 hours to remove inorganic salts and reaction solvent. The precipitate was dried to obtain a white solid, namely polyarylene ether sulfone II-1, where n was 72.

[0141] A white solid was dissolved in N,N-dimethylformamide solvent with a solid content of 20%. After filtration and vacuum degassing for 3 hours, a spinning solution was obtained. The voltage difference between the positive and negative electrodes during spinning was 20 kV; the speed of the translation motor was 40 mm / s; the distance between the receivers was 40 cm; the feed rate was 0.2 mL / h; the receiver rotation speed was 400 rpm; and the spinning time was 600 min. After drying, an electrospun polyarylene ether sulfone membrane II-1 was obtained.

[0142] Figure 8 The image shows the 1H NMR spectrum of electrospun polyarylether sulfone membrane II-1. Figure 9 Electron micrograph of electrospun polyarylether sulfone separator II-1. Figure 10 The contact angle diagram is for electrospun polyarylether sulfone separator II-1. Figure 8 The peak positions correspond to the structure, confirming the polymer structure. Figure 9 It can be seen that the fibers are of fineness and evenly distributed. Figure 10 As can be seen, the contact angle of the electrospun polyarylether sulfone diaphragm II-1 is 28.16°, indicating good wettability.

[0143] Example 5: Preparation of electrospun polyarylene ether sulfone separator II-2

[0144] In a 100 mL three-necked round-bottom flask, dihalogen compound II (6.70 g, 0.01 mol), phenolphthalein (3.18 g, 0.01 mol), potassium carbonate (1.590 g), sulfolane (12.5 g), and xylene (15 mL) were added sequentially. The mixture was heated to 150 °C and kept at that temperature for 2 hours. The mixture was then subjected to azeotropic dehydration. The xylene was removed by raising the temperature, and the mixture was further heated to 190 °C and reacted for 4.5 hours. The mixture was then heated to 205 °C and reacted for 2 hours. The mixture was cooled, and N,N-dimethylacetamide (10 mL) was added for dilution. The mixture was then precipitated in a mixed solution of ethanol and water. After filtration, the precipitate was extracted with deionized water in a Soxhlet extractor for 15 hours to remove inorganic salts and reaction solvent. The precipitate was dried to obtain a white solid, namely polyarylene ether sulfone II-2.

[0145] A white solid was dissolved in N-methylpyrrolidone solvent with a solid content of 18%. After filtration and vacuum degassing for 3 hours, a spinning solution was obtained. The voltage difference between the positive and negative electrodes during spinning was 5 kV; the speed of the translation motor was 5 mm / s; the distance between the receivers was 20 cm; the feed rate was 0.05 mL / h; the receiver rotation speed was 100 rpm; and the spinning time was 300 min. After drying, an electrospun polyarylene ether sulfone diaphragm II-2 was obtained.

[0146] Example 6 Preparation of electrospun polyarylethersulfone separator II-3

[0147] In a 100 mL three-necked round-bottom flask, dihalogen compound II (6.70 g, 0.01 mol), phenolphthalein (3.18 g, 0.01 mol), potassium carbonate (1.590 g), N-cyclohexylpyrrolidone (12.5 g), and toluene (15 mL) were added sequentially. The mixture was heated to 150 °C and kept at that temperature for 2 hours. The mixture was then subjected to azeotropic dehydration. The toluene was removed by raising the temperature, and the mixture was further heated to 190 °C and reacted for 4.5 hours. The mixture was then heated to 205 °C and reacted for 2 hours. The mixture was cooled, and N,N-dimethylacetamide (10 mL) was added for dilution. The mixture was then precipitated in a mixed solution of ethanol and water. After filtration, the precipitate was extracted with deionized water in a Soxhlet extractor for 15 hours to remove inorganic salts and reaction solvent. The precipitate was dried to obtain a white solid, namely polyarylene ether sulfone II-3.

[0148] A white solid was dissolved in N-methylpyrrolidone solvent with a solid content of 22%. After filtration and vacuum degassing for 3 hours, a spinning solution was obtained. The voltage difference between the positive and negative electrodes during spinning was 10 kV; the speed of the translation motor was 12 mm / s; the distance between the receivers was 30 cm; the feed rate was 0.1 mL / h; the receiver rotation speed was 300 rpm; and the spinning time was 500 min. After drying, an electrospun polyarylene ether sulfone diaphragm II-3 was obtained.

[0149] Example 7 Preparation of electrospun polyarylethersulfone separator III-1

[0150] The structural formula is shown below:

[0151]

[0152] In a 100 mL three-necked round-bottom flask, add the following compounds sequentially: dihalogen compound I (4.62 g, 0.01 mol), 3,3-bis(4-hydroxyphenyl)-2-phenylprop-1-one (3.14 g, 0.008 mol), phenolphthalein (0.64 g, 0.002 mol), potassium carbonate (1.590 g), sulfolane (12.5 g), and toluene (15 mL). Heat to 150 °C, maintain this temperature for 2 hours, azeotropically remove water, and then raise the temperature... After removing toluene, the mixture was heated to 190°C and reacted for 4.5 hours, then heated to 205°C and reacted for 2 hours. The mixture was cooled, diluted with 10 mL of N,N-dimethylacetamide, and precipitated in a mixture of ethanol and water. The precipitate was filtered and extracted with deionized water in a Soxhlet extractor for 15 hours to remove inorganic salts and reaction solvent. The precipitate was dried to obtain a white solid, namely polyarylene ether sulfone III-1, in which x is 68 and y is 17.

[0153] A white solid was dissolved in N,N-dimethylformamide solvent with a solid content of 15%. After filtration and vacuum degassing for 3 hours, a spinning solution was obtained. The voltage difference between the positive and negative electrodes during spinning was 20 kV; the speed of the translation motor was 40 mm / s; the distance between the receivers was 40 cm; the feed rate was 0.2 mL / h; the receiver rotation speed was 400 rpm; and the spinning time was 600 min. After drying, an electrospun polyarylene ether sulfone membrane III-1 was obtained.

[0154] Example 8 Preparation of electrospun polyarylethersulfone separator III-2

[0155] In a 100 mL three-necked round-bottom flask, the following compounds were added sequentially: dihalogen compound I (4.62 g, 0.01 mol), 3,3-bis(4-hydroxyphenyl)-2-phenylprop-1-one (0.79 g, 0.002 mol), phenolphthalein (2.54 g, 0.008 mol), potassium carbonate (1.590 g), sulfolane (12.5 g), and toluene (15 mL). The mixture was heated to 150 °C and kept at that temperature for 2 hours. The mixture was then subjected to azeotropic dehydration. The toluene was removed by raising the temperature, and the mixture was further heated to 190 °C and reacted for 4.5 hours. The mixture was then heated to 205 °C and reacted for 2 hours. The mixture was cooled, and N,N-dimethylacetamide (10 mL) was added for dilution. The mixture was then precipitated in a mixture of ethanol and water. The precipitate was filtered and extracted with deionized water in a Soxhlet extractor for 15 hours to remove inorganic salts and reaction solvent. The precipitate was dried to obtain a white solid, namely polyarylene ether sulfone III-2.

[0156] A white solid was dissolved in N-methylpyrrolidone solvent with a solid content of 25%. After filtration and vacuum degassing for 3 hours, a spinning solution was obtained. The voltage difference between the positive and negative electrodes during spinning was 5 kV; the speed of the translation motor was 5 mm / s; the distance between the receivers was 20 cm; the feed rate was 0.05 mL / h; the receiver rotation speed was 100 rpm; and the spinning time was 300 min. After drying, an electrospun polyarylene ether sulfone diaphragm III-2 was obtained.

[0157] Example 9 Preparation of electrospun polyarylethersulfone separator III-3

[0158] In a 100 mL three-necked round-bottom flask, the following compounds were added sequentially: dihalogen compound I (4.62 g, 0.01 mol), 3,3-bis(4-hydroxyphenyl)-2-phenylprop-1-one (3.14 g, 0.008 mol), phenolphthalein (0.64 g, 0.002 mol), potassium carbonate (1.590 g), N-methylpyrrolidone (12.5 g), and xylene (15 mL). The mixture was heated to 150 °C and kept at that temperature for 2 hours. The mixture was then subjected to azeotropic dehydration. The xylene was removed by raising the temperature, and the mixture was further heated to 190 °C and reacted for 4.5 hours. The mixture was then heated to 205 °C and reacted for 2 hours. The mixture was cooled, and N,N-dimethylacetamide (10 mL) was added for dilution. The mixture was then precipitated in a mixture of ethanol and water. After filtration, the precipitate was extracted with deionized water in a Soxhlet extractor for 15 hours to remove inorganic salts and reaction solvent. The precipitate was dried to obtain a white solid, namely polyarylene ether sulfone III-3.

[0159] A white solid was dissolved in N-methylpyrrolidone solvent with a solid content of 30%. After filtration and vacuum degassing for 3 hours, a spinning solution was obtained. The voltage difference between the positive and negative electrodes during spinning was 10 kV; the speed of the translation motor was 12 mm / s; the distance between the receivers was 30 cm; the feed rate was 0.1 mL / h; the receiver rotation speed was 300 rpm; and the spinning time was 500 min. After drying, an electrospun polyarylene ether sulfone diaphragm III-3 was obtained.

[0160] Example 10 Preparation of electrospun polyarylethersulfone separator III-4

[0161] In a 100 mL three-necked round-bottom flask, the following compounds were added sequentially: dihalogen compound I (4.62 g, 0.01 mol), 3,3-bis(4-hydroxyphenyl)-2-phenylprop-1-one (3.14 g, 0.008 mol), phenolphthalein (0.64 g, 0.002 mol), potassium carbonate (1.590 g), dimethyl sulfoxide (12.5 g), and xylene (15 mL). The mixture was heated to 150 °C and kept at that temperature for 2 hours. The mixture was then subjected to azeotropic dehydration. The xylene was removed by raising the temperature, and the mixture was further heated to 190 °C and reacted for 4.5 hours. The mixture was then heated to 205 °C and reacted for 2 hours. The mixture was cooled, and N,N-dimethylacetamide (10 mL) was added for dilution. The mixture was precipitated in a mixture of ethanol and water. After filtration, the precipitate was extracted with deionized water in a Soxhlet extractor for 15 hours to remove inorganic salts and reaction solvent. The precipitate was dried to obtain a white solid, namely polyarylene ether sulfone III-4.

[0162] A white solid was dissolved in N,N-dimethylformamide solvent, with a solid content of 22%. After filtration and vacuum degassing for 3 hours, a spinning solution was obtained. The voltage difference between the positive and negative electrodes was 5 kV; the translation motor speed was 5 mm / s; the receiver distance was 20 cm; the feed rate was 0.05 mL / h; the receiver rotation speed was 100 rpm; and the spinning time was 300 min. After drying, an electrospun polyarylene ether sulfone membrane III-4 was obtained.

[0163] Example 11 Preparation of electrospun polyarylene ether sulfone separator IV-1

[0164] The structural formula is shown below:

[0165]

[0166] In a 100 mL three-necked round-bottom flask, difluorodiphenyl sulfone (2.54 g, 0.01 mol), phenolphthalein (3.18 g, 0.01 mol), potassium carbonate (1.590 g), N-methylpyrrolidone (12.5 g), and toluene (15 mL) were added sequentially. The mixture was heated to 150 °C and kept at that temperature for 2 hours. The mixture was then subjected to azeotropic dehydration. The toluene was removed by raising the temperature, and the mixture was further heated to 190 °C and reacted for 4.5 hours. The mixture was then heated to 205 °C and reacted for 2 hours. The mixture was cooled, and N,N-dimethylacetamide (10 mL) was added for dilution. The mixture was then precipitated in a mixture of ethanol and water. After filtration, the precipitate was extracted with deionized water in a Soxhlet extractor for 15 hours to remove inorganic salts and reaction solvent. The precipitate was dried to obtain a white solid, namely polyarylene ether sulfone IV-1, where n was 156.

[0167] A white solid was dissolved in N,N-dimethylformamide solvent with a solid content of 20%. After filtration and vacuum degassing for 3 hours, a spinning solution was obtained. The voltage difference between the positive and negative electrodes during spinning was 20 kV; the speed of the translation motor was 40 mm / s; the distance between the receivers was 40 cm; the feed rate was 0.2 mL / h; the receiver rotation speed was 400 rpm; and the spinning time was 600 min. After drying, an electrospun polyarylene ether sulfone membrane IV-1 was obtained.

[0168] Figure 11 The image shows the 1H NMR spectrum of electrospun polyarylethersulfone separator IV-1. Figure 12 This is an electron microscope image of electrospun polyarylether sulfone separator IV-1. Figure 13 This is a contact angle diagram for electrospun polyarylethersulfone separator IV-1. From... Figure 11 The peak positions correspond to the structure, confirming the polymer structure. Figure 12 It can be seen that the fibers are of fineness and evenly distributed. Figure 13 As can be seen, the contact angle of the electrospun polyarylether sulfone diaphragm IV-1 is 30.44°, indicating good wettability.

[0169] Example 12 Preparation of electrospun polyarylene ether sulfone separator IV-2

[0170] In a 100 mL three-necked round-bottom flask, difluorodiphenyl sulfone (2.54 g, 0.01 mol), 3,3-bis(4-hydroxyphenyl)-2-phenylprop-1-one (0.79 g, 0.002 mol), phenolphthalein (2.54 g, 0.008 mol), potassium carbonate (1.590 g), sulfolane (12.5 g), and toluene (15 mL) were added sequentially. The mixture was heated to 150 °C and kept at that temperature for 2 hours. The mixture was then subjected to azeotropic dehydration. The toluene was removed by raising the temperature, and the mixture was further heated to 190 °C and reacted for 4.5 hours. The mixture was then heated to 205 °C and reacted for 2 hours. The mixture was cooled, and N,N-dimethylacetamide (10 mL) was added for dilution. The mixture was precipitated in a mixture of ethanol and water. The precipitate was filtered and extracted with deionized water in a Soxhlet extractor for 15 hours to remove inorganic salts and reaction solvent. The precipitate was dried to obtain a white solid, namely polyarylene ether sulfone IV-2.

[0171] A white solid was dissolved in N-methylpyrrolidone solvent with a solid content of 25%. After filtration and vacuum degassing for 3 hours, a spinning solution was obtained. The voltage difference between the positive and negative electrodes during spinning was 5 kV; the speed of the translation motor was 5 mm / s; the distance between the receivers was 20 cm; the feed rate was 0.05 mL / h; the receiver rotation speed was 100 rpm; and the spinning time was 300 min. After drying, an electrospun polyarylene ether sulfone diaphragm IV-2 was obtained.

[0172] Example 13 Preparation of electrospun polyarylene ether sulfone separator IV-3

[0173] In a 100 mL three-necked round-bottom flask, difluorodiphenyl sulfone (2.54 g, 0.01 mol), 3,3-bis(4-hydroxyphenyl)-2-phenylprop-1-one (3.14 g, 0.008 mol), phenolphthalein (0.64 g, 0.002 mol), potassium carbonate (1.590 g), N-methylpyrrolidone (12.5 g), and xylene (15 mL) were added sequentially. The mixture was heated to 150 °C and kept at that temperature for 2 hours. Azeotropic dehydration was performed, and the xylene was removed by raising the temperature. The mixture was then heated to 190 °C and reacted for 4.5 hours. The mixture was then heated to 205 °C and reacted for 2 hours. The mixture was cooled, and N,N-dimethylacetamide (10 mL) was added for dilution. The mixture was precipitated in a mixture of ethanol and water. After filtration, the precipitate was extracted with deionized water in a Soxhlet extractor for 15 hours to remove inorganic salts and reaction solvent. The precipitate was dried to obtain a white solid, namely polyarylene ether sulfone IV-3.

[0174] A white solid was dissolved in N-methylpyrrolidone solvent with a solid content of 30%. After filtration and vacuum degassing for 3 hours, a spinning solution was obtained. The voltage difference between the positive and negative electrodes during spinning was 10 kV; the speed of the translation motor was 12 mm / s; the distance between the receivers was 30 cm; the feed rate was 0.1 mL / h; the receiver rotation speed was 300 rpm; and the spinning time was 500 min. After drying, an electrospun polyarylene ether sulfone membrane IV-3 was obtained.

[0175] Test Example 1

[0176] Ionic conductivity was measured on an electrochemical workstation after the separator was cut into 19mm diameter samples and assembled into a CR2032 battery in the following order: positive electrode shell, stainless steel sheet, separator (the separator needs to be wetted with electrolyte), stainless steel sheet, and negative electrode shell. The ionic conductivity result can be calculated using the following formula:

[0177]

[0178] In the formula, d represents the effective thickness of the diaphragm (μm), and S represents the effective contact area between the diaphragm and the stainless steel sheet (cm²). 2 R represents the bulk resistance of the diaphragm (Ω).

[0179] The electrochemical stability window is determined by testing the linear sweep voltammetry (LSV) image of a simulated stainless steel sheet / separator / lithium sheet battery using an electrochemical workstation, selecting the LSV test mode, and setting the test voltage range to 2.5–6V (vs. Li / Li). + The scanning frequency is set to 5mV / s.

[0180] The liquid absorption rate is determined by vacuum drying the membrane at 100℃ for 24 hours and weighing it to obtain the dry weight M1. Then, the membrane is immersed in an electrolyte solution (1 mol / L LiPF6 dissolved in EC / EMC / DMC (1 / 1 / 1, w / w / w)) for 12 hours. After removal, the residual electrolyte on the membrane surface is removed and the membrane is weighed to obtain the wet weight M2. The liquid absorption rate can be calculated using the following formula:

[0181]

[0182] In the formula, EU is the liquid absorption rate of the diaphragm (%), M1 is the dry weight of the diaphragm (g), and M2 is the wet weight of the diaphragm (g).

[0183] Porosity is determined by first preparing a diaphragm into a 19mm diameter disc and weighing the dry membrane (Wdry). Then, the dry membrane is immersed in a n-butanol solution for 12 hours. The residual solution on the surface is removed using filter paper, and the mass of the wet membrane (Wwet) is measured. Porosity (P) can be calculated using the following formula:

[0184]

[0185] In the formula, P is the porosity of the membrane (%), Wdry is the dry weight of the membrane (g), Wwet is the wet weight of the membrane (g), and ρ is the density of n-butanol (g / cm³). -3 V is the volume of the dry film (cm³). 3 ).

[0186] The contact angle was measured using a Cruz DSA100 (Germany). The diaphragm was first cut into strips of 1cm x 5cm and flattened against a glass slide. Electrolyte was then dropped onto the diaphragm surface using a syringe, and the contact angle was measured after 30 seconds. Five samples were taken for each type of diaphragm, and the final result was the average of the contact angles of the five samples.

[0187] Battery cycle performance was tested using the Land battery testing system, with CR2032 batteries used in the test. Before testing, the batteries were charged and discharged once at a low rate of 0.1C. Then, they were cycled 100 times at a current of 0.5C. The battery charge / discharge voltage range was set to 0.01V–3V.

[0188] The comparative example used a PP 2400 diaphragm from KELU to directly test its performance. The specific experimental results are shown in Table 1.

[0189] Table 1. Performance of electrospun polyarylethersulfone separators

[0190]

[0191] As can be seen from Table 1, the electrospun polyarylene ether sulfone membrane prepared in this application has high ionic conductivity, high porosity, and high liquid absorption rate, a wider electrochemical window, and high voltage resistance; its contact angle is smaller than that of existing commercially available membranes (see Table 1). Figure 14 (Contact angle is 51.24°), the separator has excellent wettability; the assembled battery has a higher capacity retention rate than commercial PP separators after 100 cycles at 0.5C, and has excellent cycle stability.

[0192] like Figure 15-18 As shown, the electrospun polyarylethersulfone separators from Examples 1, 4, 11, and the comparative example were used as separators for battery capacity rate testing. Figure 15 As can be seen from the data, the electrospun separator I-1 exhibits high coulombic efficiency, with almost no capacity decay in the capacity retention curve after 100 cycles, indicating high capacity retention. Figure 16 The Zhongdianshuang II-1 separator exhibits high coulombic efficiency in its cells, with almost no capacity decay in its capacity retention curve after 100 cycles, demonstrating high capacity retention. Figure 17 The Zhongdianfang IV-1 separator exhibits high battery coulombic efficiency, with almost no capacity decay in its capacity retention curve after 100 cycles, demonstrating high battery capacity retention. Figure 18 The medium-component PP separator has high coulombic efficiency, but its capacity retention rate decreases significantly after 100 cycles, resulting in low battery capacity retention.

[0193] The above description is merely a few embodiments of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. An electrospun polyarylethersulfone separator, characterized in that, The electrospun polyarylethersulfone diaphragm is obtained by electrospinning with a spinning solution containing polyarylethersulfone polymer; The polyarylene ether sulfone polymer has the structure shown in Formula I: In Formula I, 10 ≤ n ≤ 500, where n is an integer, and 0 ≤ m ≤ 5, where m is an integer; Wherein, R is a bisphenol compound, and the bisphenol compound is selected from one of the structures shown in Formula I-1, Formula I-2, Formula I-3, Formula I-4, Formula I-5, Formula I-6, Formula I-7, and Formula I-8; 2. The electrospun polyarylethersulfone separator according to claim 1, characterized in that, The liquid absorption rate of the electrospun polyarylethersulfone diaphragm is 150% to 400%. Preferably, the porosity of the electrospun polyarylethersulfone membrane is 70% to 90%; Preferably, the electrospun polyarylethersulfone membrane has an ionic conductivity of 1.4–2.4 mS / cm. -1 .

3. The method for preparing the electrospun polyarylethersulfone separator according to claim 1, characterized in that, The preparation method includes the following steps: (1) A mixture containing polyarylether sulfone polymer and solvent is mixed to obtain a spinning solution; (2) The spinning solution is sprayed into a film by electrospinning and dried to obtain the electrospun polyarylether sulfone membrane.

4. The preparation method according to claim 3, characterized in that, In step (2), the electrospinning conditions are: the voltage difference between the positive and negative electrodes is 5kV to 20kV. Preferably, the speed of the translation motor for spinning is 5 mm / s to 40 mm / s; Preferably, the distance between the receiver of the spinning process and the receiver is 20cm to 40cm; Preferably, the spinning advance rate is 0.05 mL / h to 0.2 mL / h; Preferably, the spinneret rotation speed is 100 rpm to 400 rpm; Preferably, the spinning time is 300 min to 600 min.

5. The preparation method according to claim 3, characterized in that, In step (1), the mass ratio of the polyarylether sulfone polymer to the solvent is 1:1 to 1:6; Preferably, the solvent is selected from at least one of N,N-dimethylformamide, N,N-dimethylacetamide, tetrahydrofuran, N-methylpyrrolidone, dimethyl sulfoxide, and triethyl phosphate.

6. The preparation method according to claim 3, characterized in that, In step (1), the preparation method of the polyarylether sulfone polymer includes: A mixture containing bisphenol compounds, dihalogenated diphenyl sulfone derivatives, a catalyst, a dehydrating agent, and solvent I is reacted to obtain the polyarylether sulfone polymer.

7. The preparation method according to claim 6, characterized in that, The bisphenol compounds are selected from at least one of phenolphthalein, 3,3-bis(4-hydroxyphenyl)-2-phenylprop-1-one, phenolphthalein, 9,9'-bis(4-hydroxyphenyl)fluorene, 3,3'-diisopropylphenolphthalein, 3,3'-dimethylphenolphthalein, 2′,5′,2″,5″-tetramethylphenolphthalein, and thymolphthalein. Preferably, the molar ratio of the bisphenol compound to the dihalodiphenyl sulfone derivative is 0.83 to 1.0:1; Preferably, the dihalodiphenyl sulfone derivative has the structure shown in Formula II: In Formula II, X is selected from any one of F, Cl, Br, and I; 0 ≤ m ≤ 5, where m is an integer.

8. The preparation method according to claim 6, characterized in that, The molar ratio of the bisphenol compound to the catalyst is 0.2–0.4:1; Preferably, the molar volume ratio of the bisphenol compound, the dehydrating agent, and solvent I is: 0.01–0.02 mol: 15–40 mL: 10–40 mL; Preferably, the catalyst is selected from at least one of potassium carbonate, sodium carbonate, sodium bicarbonate, and calcium carbonate; Preferably, the dehydrating agent is selected from at least one of toluene, xylene, chlorobenzene, and 1,2-dichlorobenzene; Preferably, solvent I is selected from at least one of N-methylpyrrolidone, N-cyclohexylpyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, sulfolane, dimethylimidazolide, and diphenyl sulfone.

9. The preparation method according to claim 6, characterized in that, The reaction temperature is 100–230°C, and the reaction time is 2–24 h; Preferably, the reaction temperature is 150–200°C and the reaction time is 3–10 h.

10. The application of the electrospun polyarylethersulfone separator according to any one of claims 1 to 2 in the field of high-performance batteries.

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