Bio-based aromatic polyamide lithium battery diaphragm and preparation method thereof

Abstract

The invention discloses a bio-based aromatic polyamide lithium battery diaphragm and a preparation method thereof, and belongs to the technical field of battery diaphragm materials. A preparation method of a bio-based aromatic polyamide lithium battery diaphragm comprises the following steps: S1, in an inert atmosphere, uniformly mixing furan ring-containing diamine, furan ring-containing acyl chloride and DMF (Dimethyl Formamide), adjusting pH (Potential of Hydrogen), heating and stirring to obtain a mixed solution; mixing the mixed solution with PEI and PAA, heating and stirring to obtain a bio-based polymer coating solution; s2, coating a base material with the bio-based polymer coating liquid, transferring the base material into a pure water tank after heat treatment in a vacuum environment, and stripping to obtain a thin film; s3, soaking the thin film in a ZrOCl2. 8H2O solution, and cleaning the thin film; then putting into a 2-aminoterephthalic acid solution to react, and cleaning; and performing vacuum drying to obtain the bio-based aromatic polyamide lithium battery diaphragm with good heat resistance and flame retardance and relatively high mechanical strength.

Description

Technical Field

[0001] The invention belongs to the technical field of battery separator materials, and specifically relates to a bio-based aromatic polyamide lithium battery separator and a preparation method thereof. Background Art

[0002] As the demand for green energy grows, lithium batteries are widely used in electric vehicles, aerospace and electronic equipment due to their high energy density and environmental protection characteristics. The diaphragm is the core component of lithium batteries, which is used to separate the positive and negative electrodes and ensure the efficient transmission of lithium ions. Its performance directly affects the battery capacity, cycle life and safety. Traditional polyolefin diaphragms have a low melting point and are prone to melt and shrink at high temperatures, resulting in short circuits or even combustion and explosion. They also have poor wettability to electrolytes and low lithium ion mobility. Aromatic polyamides (such as aramid) have excellent mechanical strength, thermal stability and flame retardancy. Bio-based aromatic polyamides prepared by furan not only retain these advantages, but the -O- structure on the furan ring can also enhance electrolyte wettability and improve battery performance. Therefore, the development of bio-based aromatic polyamide diaphragms helps to improve battery safety and electrochemical performance, which meets the needs of green and sustainable development.

[0003] At present, the common method for preparing aramid lithium-ion battery separators is the composite method, that is, coating the aramid solution on the surface of the polyolefin separator, and then removing the solvent to obtain the aramid / polyolefin composite membrane. However, this method has problems such as large thickness and uneven pore size distribution, and the processing process has strict requirements on the molecular weight of aramid. CN112531285A and CN112694610A propose to coat the lithium-ion separator with a modified para-aramid, and introduce other monomers into the traditional para-aramid to improve the comprehensive physical properties of the composite coating film, but the process is complicated, and the prepared separator is thick, low in porosity, and poor in heat resistance, which leads to a decrease in battery performance. CN113140867A and CN113136121 disclose a bio-based aramid polymer containing furan structure and its application in lithium ion separator. The polymer is first synthesized and then separated, and finally a variety of additives are added to the coating liquid to improve the physical properties of the coating film. The preparation method is cumbersome and involves many raw materials. At the same time, the coating film does not have a three-dimensional network structure in three-dimensional space, and the electrolyte mobility is low. Therefore, it is necessary to study and develop a bio-based aromatic polyamide lithium battery separator to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a bio-based aromatic polyamide lithium battery separator and a preparation method thereof, so as to improve the heat resistance and mechanical strength of the lithium battery separator.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A method for preparing a bio-based aromatic polyamide lithium battery separator comprises the following steps:

[0007] S1. Under an inert atmosphere, a furan ring-containing diamine, a furan ring-containing acyl chloride and DMF are uniformly mixed, the pH is adjusted, and the mixture is heated and stirred to obtain a mixed solution; the mixed solution is mixed with PEI (polyethyleneimine) and PAA (polyacrylic acid), and the mixture is heated and stirred to obtain a bio-based polymer coating solution;

[0008] S2, coating the bio-based polymer coating liquid on the substrate, transferring it to a pure water pool after heat treatment under a vacuum environment, and peeling it off to obtain a film;

[0009] S3, immersing the film in a ZrOCl2·8H2O solution and washing it; then placing it in a 2-aminoterephthalic acid solution for reaction and washing it; and vacuum drying it to obtain a bio-based aromatic polyamide lithium battery separator.

[0010] The polarity of PEI and PAA is utilized to form cross-links with diamines containing furan rings and acyl chlorides containing furan rings, and the strong adsorption of Zr ions by PEI / PAA is used to adsorb Zr ions, and Zr ions and 2-aminoterephthalic acid form a Zr-MOF structure.

[0011] Furthermore, the usage ratio of the furan ring-containing diamine, the furan ring-containing acyl chloride, DMF, PEI and PAA is (5-10) g: (10-15) g: (120-150) mL: (0.5-1.5) g: (0.8-2) g.

[0012] Furthermore, the pH is adjusted to 6-7.

[0013] Furthermore, the heating and stirring is stirring at 60-80° C. for 4-6 hours.

[0014] Furthermore, the furan ring-containing diamine is one or a combination of furanyl diamine, poly furan dicarboxylic acid trimethyl hexamethylene diamine, poly 2,5-furan dicarboxylic acid hexamethylene diamine and poly 2,5-furan dicarboxylic acid decanediamine.

[0015] Furthermore, the furan ring-containing acyl chloride is one or a combination of 2,5-furandicarboxylic acid chloride and 3,4-furandicarboxylic acid chloride.

[0016] Furthermore, the vacuum drying temperature is 60-80°C.

[0017] Furthermore, the soaking is performed at room temperature for 1-3 hours; and the reaction is performed at 70-80° C. for 5-15 minutes.

[0018] Furthermore, the cleaning is performed by alternating washing with ethanol and water three times.

[0019] Furthermore, the ZrOCl2·8H2O solution is prepared by the following steps: 1.5-2 g ZrOCl2·8H2O is mixed with 100-120 mL DMF.

[0020] Furthermore, the 2-aminoterephthalic acid solution is prepared by the following steps: 200-250 mg 2-aminoterephthalic acid, 3-6 mL glacial acetic acid, 3-6 mL plasma activated water and 100-120 mL DMF are uniformly mixed.

[0021] A bio-based aromatic polyamide lithium battery separator is prepared by the above-mentioned method for preparing a bio-based aromatic polyamide lithium battery separator.

[0022] Beneficial effects of the present invention:

[0023] (1) The present invention provides a bio-based aromatic polyamide lithium battery separator and a preparation method thereof. The prepared bio-based aromatic polyamide lithium battery separator is added with a PEI / PAA complex. The carboxyl group of PAA and the amino group of PEI provide active sites for lithium ion transmission. The hydrophilicity of the complex enhances the wettability of the electrolyte and optimizes the ion transmission path, thereby reducing the internal resistance of the battery and improving the rate performance of the battery. The polar groups of the PEI / PAA complex evenly distribute lithium ions to avoid excessive local concentration, inhibit dendrite growth, and improve the battery cycle performance.

[0024] (2) The Zr-MOF structure used in the present invention has a high specific surface area and a uniform pore structure, which provides an efficient lithium ion transmission channel, thereby improving battery performance; in addition, the rigid structure of MOF is conducive to improving the mechanical strength and heat resistance of the battery separator. On the other hand, the PEI / PAA composite forms a cross-linked network through hydrogen bonds and electrostatic effects to inhibit the deformation of the high-temperature separator, and Zr-MOF maintains structural integrity at high temperatures, synergistically enhancing the heat resistance and mechanical strength of the separator. At the same time, it has strong adsorption for Zr ions, which further enhances the overall stability of the separator, thereby improving the electrochemical performance of the battery. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example 1

[0027] This embodiment provides a bio-based aromatic polyamide lithium battery separator, which is prepared by the following steps:

[0028] S1. Under an inert atmosphere, 8 g of furanyl diamine, 12 g of 2,5-furan dicarbonyl chloride and 150 mL of DMF were mixed evenly, the pH was adjusted to 6.5, and the mixture was stirred at 60° C. for 6 h to obtain a mixed solution; the mixed solution was mixed with 1 g of PEI and 1.5 g of PAA, and the mixture was stirred at 60° C. for 6 h to obtain a bio-based polymer coating solution;

[0029] S2, coating the bio-based polymer coating liquid on the substrate, transferring it to a pure water pool after heat treatment at 80°C in a vacuum environment, and peeling it off to obtain a film;

[0030] S3. Mix 1.5 g ZrOCl2·8H2O with 100 mL DMF to obtain a ZrOCl2·8H2O solution, soak the film in the ZrOCl2·8H2O solution, soak it at room temperature for 2 hours, and wash it three times with ethanol and water alternately; mix 200 mg 2-aminoterephthalic acid, 4 mL glacial acetic acid, 4 mL plasma-activated water and 120 mL DMF to obtain a 2-aminoterephthalic acid solution, then place it in the 2-aminoterephthalic acid solution, react at 80°C for 10 minutes, and wash it three times with ethanol and water alternately; vacuum dry it at 80°C to obtain a bio-based aromatic polyamide lithium battery separator.

[0031] Example 2

[0032] Compared with Example 1, the difference between this example and Example 1 is that "8g furanyl diamine, 12g 2,5-furan dicarboxylic acid chloride" is changed to "5g furanyl diamine, 15g 2,5-furan dicarboxylic acid chloride", and the specific implementation steps of S1 are:

[0033] S1. Under an inert atmosphere, 5 g of furanyl diamine, 15 g of 2,5-furandicarbonyl chloride and 150 mL of DMF were mixed evenly, the pH was adjusted to 6.5, and the mixture was stirred at 60° C. for 6 h to obtain a mixed solution; the mixed solution was mixed with 1 g of PEI and 1.5 g of PAA, and the mixture was stirred at 60° C. for 6 h to obtain a bio-based polymer coating solution;

[0034] The remaining raw materials and preparation process remain the same as in Example 1.

[0035] Example 3

[0036] Compared with Example 1, the difference between this example and Example 1 is that "8 g furanyl diamine, 12 g 2,5-furan dicarboxylic acid chloride" is changed to "10 g furanyl diamine, 10 g 2,5-furan dicarboxylic acid chloride", and the specific implementation steps of S1 are:

[0037] S1. Under an inert atmosphere, 10 g of furanyl diamine, 10 g of 2,5-furandicarbonyl chloride and 150 mL of DMF were mixed evenly, the pH was adjusted to 6.5, and the mixture was stirred at 60° C. for 6 h to obtain a mixed solution; the mixed solution was mixed with 1 g of PEI and 1.5 g of PAA, and the mixture was stirred at 60° C. for 6 h to obtain a bio-based polymer coating solution;

[0038] The remaining raw materials and preparation process remain the same as in Example 1.

[0039] Example 4

[0040] Compared with Example 1, this example is different in that "1 g PEI, 1.5 g PAA" is changed to "1.5 g PEI, 0.8 g PAA", and the specific implementation steps of S1 are:

[0041] S1. Under an inert atmosphere, 8 g of furanyl diamine, 12 g of 2,5-furan dicarbonyl chloride and 150 mL of DMF were mixed evenly, the pH was adjusted to 6.5, and the mixture was stirred at 60° C. for 6 h to obtain a mixed solution; the mixed solution was mixed with 1.5 g of PEI and 0.8 g of PAA, and the mixture was stirred at 60° C. for 6 h to obtain a bio-based polymer coating solution;

[0042] The remaining raw materials and preparation process remain the same as in Example 1.

[0043] Example 5

[0044] Compared with Example 1, this example is different in that "1 g PEI, 1.5 g PAA" is changed to "0.5 g PEI, 2 g PAA", and the specific implementation steps of S1 are:

[0045] S1. Under an inert atmosphere, 8 g of furanyl diamine, 12 g of 2,5-furan dicarbonyl chloride and 150 mL of DMF were mixed evenly, the pH was adjusted to 6.5, and the mixture was stirred at 60° C. for 6 h to obtain a mixed solution; the mixed solution was mixed with 0.5 g of PEI and 2 g of PAA, and the mixture was stirred at 60° C. for 6 h to obtain a bio-based polymer coating solution;

[0046] The remaining raw materials and preparation process remain the same as in Example 1.

[0047] Example 6

[0048] Compared with Example 1, the difference between this example and Example 1 is that "8g furanyl diamine, 12g 2,5-furan dicarboxylic acid chloride" is changed to "8g poly 2,5-furan dicarboxylic acid hexamethylene diamine, 12g 3,4-furan dicarboxylic acid chloride", and the specific implementation steps of S1 are:

[0049] S1. Under an inert atmosphere, 8 g of poly (2,5-furandicarboxylic acid hexamethylenediamine), 12 g of 3,4-furandicarboxylic acid chloride and 150 mL of DMF were mixed evenly, the pH was adjusted to 6.5, and the mixture was stirred and reacted at 60° C. for 6 h to obtain a mixed solution; the mixed solution was mixed with 1 g of PEI and 1.5 g of PAA, and the mixture was stirred and reacted at 60° C. for 6 h to obtain a bio-based polymer coating solution;

[0050] The remaining raw materials and preparation process remain the same as in Example 1.

[0051] Example 7

[0052] Compared with Example 1, the difference between this embodiment and Example 1 is that "200 mg 2-aminoterephthalic acid, 4 mL glacial acetic acid, 4 mL plasma-activated water" is changed to "250 mg 2-aminoterephthalic acid, 3 mL glacial acetic acid, 3 mL plasma-activated water", and the specific implementation steps of S3 are:

[0053] S3. Mix 1.5 g ZrOCl2·8H2O with 100 mL DMF to obtain a ZrOCl2·8H2O solution, soak the film in the ZrOCl2·8H2O solution, soak it at room temperature for 2 hours, and wash it three times with ethanol and water alternately; mix 200 mg 2-aminoterephthalic acid, 4 mL glacial acetic acid, 4 mL plasma-activated water and 120 mL DMF to obtain a 2-aminoterephthalic acid solution, then place it in the 2-aminoterephthalic acid solution, react at 80°C for 10 minutes, and wash it three times with ethanol and water alternately; vacuum dry it at 80°C to obtain a bio-based aromatic polyamide lithium battery separator.

[0054] The remaining raw materials and preparation process remain the same as in Example 1.

[0055] Comparative Example 1

[0056] Compared with Example 1, this comparative example is different in that no PAA is added. The specific implementation steps of S1 are:

[0057] S1. Under an inert atmosphere, 8 g of furanyl diamine, 12 g of 2,5-furandicarbonyl chloride and 150 mL of DMF were mixed evenly, the pH was adjusted to 6.5, and the mixture was stirred at 60° C. for 6 h to obtain a mixed solution; the mixed solution was mixed with 1 g of PEI, and the mixture was stirred at 60° C. for 6 h to obtain a bio-based polymer coating solution;

[0058] The remaining raw materials and preparation process remain the same as in Example 1.

[0059] Comparative Example 2

[0060] Compared with Example 1, this comparative example is different in that PEI is not added, and the specific implementation steps of S1 are:

[0061] S1. Under an inert atmosphere, 8 g of furanyl diamine, 12 g of 2,5-furandicarbonyl chloride and 150 mL of DMF were mixed evenly, the pH was adjusted to 6.5, and the mixture was stirred at 60° C. for 6 h to obtain a mixed solution; the mixed solution was mixed with 1.5 g of PAA, and the mixture was stirred at 60° C. for 6 h to obtain a bio-based polymer coating solution;

[0062] The remaining raw materials and preparation process remain the same as in Example 1.

[0063] Comparative Example 3

[0064] Compared with Example 1, the difference between this comparative example is that PAA and PEI are not added at the same time. The specific implementation steps of S1 are:

[0065] S1. Under an inert atmosphere, 8 g of furanyl diamine, 12 g of 2,5-furan dicarbonyl chloride and 150 mL of DMF were mixed evenly, the pH was adjusted to 6.5, and the mixture was stirred at 60° C. for 6 h to obtain a bio-based polymer coating liquid;

[0066] The remaining raw materials and preparation process remain the same as in Example 1.

[0067] Comparative Example 4

[0068] Compared with Example 1, this comparative example differs in that step S3 is not performed, and the specific implementation steps are as follows:

[0069] S1. Under an inert atmosphere, 8 g of furanyl diamine, 12 g of 2,5-furan dicarbonyl chloride and 150 mL of DMF were mixed evenly, the pH was adjusted to 6.5, and the mixture was stirred at 60° C. for 6 h to obtain a mixed solution; the mixed solution was mixed with 1 g of PEI and 1.5 g of PAA, and the mixture was stirred at 60° C. for 6 h to obtain a bio-based polymer coating solution;

[0070] S2. The bio-based polymer coating liquid is coated on the substrate, and after heat treatment at 80°C in a vacuum environment, it is transferred to a pure water pool, peeled off, and vacuum dried at 80°C to obtain a bio-based aromatic polyamide lithium battery separator.

[0071] The remaining raw materials and preparation process remain the same as in Example 1.

[0072] Comparative Example 5

[0073] Compared with Example 1, this comparative example differs in that "2-aminoterephthalic acid" is replaced by "terephthalic acid", and the specific implementation steps of S3 are:

[0074] S3. Mix 1.5 g ZrOCl2·8H2O with 100 mL DMF to obtain a ZrOCl2·8H2O solution, soak the film in the ZrOCl2·8H2O solution, soak it at room temperature for 2 hours, and wash it three times with ethanol and water alternately; mix 200 mg terephthalic acid, 4 mL glacial acetic acid, 4 mL plasma-activated water and 120 mL DMF to obtain a terephthalic acid solution, then place it in the terephthalic acid solution, react at 80°C for 10 minutes, and wash it three times with ethanol and water alternately; vacuum dry it at 80°C to obtain a bio-based aromatic polyamide lithium battery separator.

[0075] The remaining raw materials and preparation process remain the same as in Example 1.

[0076] Performance Testing

[0077] Thermal shrinkage rate: The flame-retardant bio-based lithium battery separators obtained in various embodiments and comparative examples of the present application were tested for thermal shrinkage rate according to GB / T 36363-2018;

[0078] Tensile strength: The flame-retardant bio-based lithium battery separators obtained in various embodiments and comparative examples of the present application were tested for tensile strength according to GB / T 36363-2018;

[0079] Battery capacity retention rate: The diaphragms in the examples and comparative examples are applied to lithium iron phosphate batteries of the same specifications. The battery is placed in a 45°C constant temperature box, and a constant current charge is performed at a rate of 1C until the termination voltage is reached, and then the constant voltage charge is switched to. Charging is stopped when the charging current drops to 0.05C, and the battery is left standing for 30 minutes and then discharged at a rate of 0.5C. After leaving standing for 30 minutes, the battery is continued to be charged according to the above method, and then left standing for another 30 minutes and then discharged at a rate of 0.5C. The battery is cycled continuously for 500 times according to the above charge and discharge method, and the battery discharge capacity / initial capacity*100% is tested to calculate the battery capacity retention rate;

[0080] LOI: The flame retardant properties of the flame retardant bio-based lithium battery separators obtained in various embodiments and comparative examples of the present application were tested according to GB / T 2406-2022.

[0081] The results are shown in Table 1:

[0082] Table 1

[0083]

[0084] It can be seen from Table 1 that the only difference between Examples 2-7 and Example 1 is the change in the raw material ratio within a reasonable range and the reasonable replacement of the raw materials. The prepared bio-based aromatic polyamide lithium battery separator has good heat resistance and flame retardancy, strong mechanical strength and excellent porosity.

[0085] Comparative Example 1-2 Compared with Example 1, after the separator is applied to the battery without adding PAA or PEI, the electrochemical performance of the battery decreases, and the mechanical properties and heat resistance also decrease accordingly. This is because the carboxyl group of PAA and the amino group of PEI provide active sites for lithium ion transmission, which can not only improve the electrochemical performance of the battery, but also PAA can be cross-linked with PEI and then combined with furan ring-containing diamines and furan ring-containing acyl chlorides to enhance the mechanical properties of the separator; Comparative Example 3 combines Comparative Examples 1-2 and Example 1 to further prove that the PEI / PAA composite enhances the performance of the separator; Comparative Example 4 Compared with Example 1, the reduction in the performance of the diaphragm indicates that the rigid structure of MOF is beneficial to improving the mechanical strength and heat resistance of the battery diaphragm; Comparative Example 4 combined with Comparative Example 3 compared with Example 1 shows the synergistic effect of the PEI / PAA composite and Zr-MOF. On the one hand, the PEI / PAA composite forms a cross-linked network through hydrogen bonds and electrostatic effects to inhibit the deformation of the high-temperature diaphragm. On the other hand, Zr-MOF maintains structural integrity at high temperatures, synergistically enhancing the heat resistance and mechanical strength of the diaphragm, and at the same time has strong adsorption for Zr ions, further enhancing the overall stability of the diaphragm.

[0086] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0087] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a bio-based aromatic polyamide lithium battery separator, characterized in that: The following steps are involved: S1. Under an inert atmosphere, a furan ring-containing diamine, a furan ring-containing acyl chloride and DMF are uniformly mixed, the pH is adjusted, and the mixture is heated and stirred to obtain a mixed solution; the mixed solution is mixed with PEI and PAA, and the mixture is heated and stirred to obtain a bio-based polymer coating solution; S2, coating the bio-based polymer coating liquid on the substrate, transferring it to a pure water pool after heat treatment in a vacuum environment, and peeling it off to obtain a film; S3, immersing the film in a ZrOCl2·8H2O solution and washing it; then placing it in a 2-aminoterephthalic acid solution for reaction and washing it; and vacuum drying it to obtain a bio-based aromatic polyamide lithium battery separator.

2. The method for preparing a bio-based aromatic polyamide lithium battery separator according to claim 1, characterized in that: The usage ratio of the furan ring-containing diamine, the furan ring-containing acyl chloride, DMF, PEI and PAA is (5-10) g: (10-15) g: (120-150) mL: (0.5-1.5) g: (0.8-2) g.

3. The method for preparing a bio-based aromatic polyamide lithium battery separator according to claim 1, characterized in that: The pH is adjusted to 6-7; the heating and stirring is performed at 60-80° C. for 4-6 hours.

4. The method for preparing a bio-based aromatic polyamide lithium battery separator according to claim 1, characterized in that: The furan ring-containing diamine is one or a combination of furanyl diamine, poly furan dicarboxylic acid trimethyl hexamethylene diamine, poly 2,5-furan dicarboxylic acid hexamethylene diamine and poly 2,5-furan dicarboxylic acid decanediamine.

5. The method for preparing a bio-based aromatic polyamide lithium battery separator according to claim 1, characterized in that: The furan ring-containing acyl chloride is one or a combination of 2,5-furandicarboxylic acid chloride and 3,4-furandicarboxylic acid chloride.

6. The method for preparing a bio-based aromatic polyamide lithium battery separator according to claim 1, characterized in that: The vacuum drying temperature is 60-80° C.; the soaking is performed at room temperature for 1-3 hours; and the reaction is performed at 70-80° C. for 5-15 minutes.

7. The method for preparing a bio-based aromatic polyamide lithium battery separator according to claim 1, characterized in that: The cleaning is performed by alternately washing with ethanol and water three times.

8. The method for preparing a bio-based aromatic polyamide lithium battery separator according to claim 1, characterized in that: The ZrOCl2·8H2O solution is prepared by the following steps: 1.5-2 g ZrOCl2·8H2O is mixed with 100-120 mL DMF.

9. The method for preparing a bio-based aromatic polyamide lithium battery separator according to claim 1, characterized in that: The 2-aminoterephthalic acid solution is prepared by the following steps: 200-250 mg of 2-aminoterephthalic acid, 3-6 mL of glacial acetic acid, 3-6 mL of plasma activated water and 100-120 mL of DMF are uniformly mixed.

10. A bio-based aromatic polyamide lithium battery separator, characterized in that: The compound is prepared by the preparation method according to any one of claims 1 to 9.

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