High-temperature-resistant benzimidazolone polyamide imide battery binder as well as preparation method and application thereof

Abstract

The invention discloses a high-temperature-resistant benzimidazolone polyamide imide battery binder as well as a preparation method and application thereof, and belongs to the technical field of battery materials. The high-temperature-resistant benzimidazolone polyamideimide battery binder with uniformly distributed amide segments and imide segments is prepared through a method for activating aromatic diamine on one side of trimethylchlorosilane and changing the activity of amino groups on the two sides, the comprehensive performance of the high-temperature-resistant benzimidazolone polyamideimide battery binder is excellent, the defects that a traditional binder is poor in heat resistance and insufficient in chemical stability are overcome, and the service life of the high-temperature-resistant benzimidazolone polyamideimide battery binder is prolonged. The introduction of high-polarity groups can improve the wettability and ion transmission capability of the electrolyte, improve the solubility of the electrolyte so as to facilitate electrode forming, and can also form strong chemical bonds or physical adsorption with positive and negative inorganic active materials during application, thereby reducing the structural damage in the cycle process and improving the electrochemical performance of the battery. The lithium ion battery electrode can keep a stable structure in a high-temperature environment, the thermal runaway risk caused by high temperature is remarkably reduced, and the application requirements of the lithium ion battery in a fast charging or high-temperature energy storage scene are well met.

Description

Technical Field

[0001] The present application relates to a high-temperature resistant benzimidazolone polyamide-imide battery binder and a preparation method and application thereof, belonging to the technical field of battery materials. Background Art

[0002] Lithium-ion batteries, introduced in the late 1980s, are widely used in portable electronic products such as mobile phones, laptops, and digital cameras, and market demand is growing at an astonishing rate. Simultaneously, countries are vying to develop the electric vehicle industry, and research and development of power batteries is in full swing. Due to their excellent overall performance, lithium-ion batteries have become one of the preferred high-energy power batteries in the electric vehicle industry. Furthermore, lithium-ion batteries also have broad application prospects in a wide range of fields, including space technology and the defense industry.

[0003] With the widespread application of lithium-ion batteries in electric vehicles, energy storage systems, and high-power electronic devices, the demand for their high-temperature stability and cycle life is becoming increasingly urgent. Battery binders, as key components of electrode materials, directly impact the structural integrity, conductive network stability, and long-term electrochemical performance of the electrode. However, traditional binders (such as polyvinylidene fluoride (PVDF) and carboxymethyl cellulose (CMC)) exhibit significant drawbacks at high temperatures or under extreme operating conditions. For example, PVDF's glass transition temperature (Tg) is typically below 150°C, making it susceptible to softening or degradation at high temperatures (>80°C), leading to the shedding of active electrode materials, increased impedance, and even the risk of thermal runaway. Furthermore, due to their poor chemical stability, conventional binders easily swell or decompose in high-voltage electrolytes (e.g., ester solvents corrode PVDF), disrupting the electrode microstructure and accelerating capacity decay. Furthermore, during the charge and discharge process, the volume expansion rate of active materials (such as silicon-based anodes) can reach as high as 300%. Due to their limited mechanical properties and insufficient flexibility, traditional binders struggle to maintain electrode integrity, significantly shortening cycle life.

[0004] Many factors contribute to increased heat and temperature within high-capacity and high-power batteries, making it particularly important to improve the battery's high-temperature resistance. Polyamide-imide (PAI), a high-performance engineering plastic, has demonstrated unique potential in recent years as a lithium battery binder. Compared to traditional binders and other novel materials, PAI's Tg typically exceeds 280°C, significantly higher than that of PVDF (approximately -40°C to 150°C). This allows it to maintain structural stability in high-temperature environments (such as fast charging or high-temperature energy storage), avoiding softening, deformation, or degradation. Furthermore, PAI's thermal decomposition temperature can reach over 400°C, significantly reducing the risk of thermal runaway caused by high temperatures and improving battery safety. Regarding chemical stability, the imide ring structure within the PAI molecular chain imparts strong chemical resistance, making it less susceptible to swelling or decomposition in high-voltage electrolytes (such as carbonate solvents containing LiPF6), reducing interfacial side reactions. In high-voltage cathodes (such as high-nickel ternary materials and lithium-rich manganese-based materials), PAI resists oxidative decomposition, extending the electrode's cycle life. Because PAI itself can also function as a high-performance engineering plastic with high mechanical strength and interfacial bonding, it can be used as a binder to impart high strength and toughness to electrodes, effectively resisting volume expansion (>300%) of electrode materials and preventing the exfoliation of active particles. By introducing polar groups, PAI can form strong chemical bonds or physical adsorption with active materials (such as silicon, graphite, and high-nickel cathodes), reducing structural damage during cycling. Summary of the Invention

[0005] In order to solve the problems of insufficient electrolyte wetting ability and ion transmission ability in the existing technology of polyamide-imide battery adhesives, and the problem that the existing adhesives are prone to structural damage due to electrochemical reactions during the cycle, the present application proposes a technical solution for a high-temperature resistant benzimidazolone polyamide-imide battery adhesive. By unilaterally activating aromatic diamine with trimethylchlorosilane and changing the activity of amino groups on both sides, a high-temperature resistant benzimidazolone polyamide-imide battery adhesive with uniformly distributed amide segments and imide segments is prepared.

[0006] This application adopts the following technical solutions:

[0007] According to the first aspect of the present application, a high-temperature resistant benzimidazolone polyamide-imide battery binder is provided, wherein the high-temperature resistant benzimidazolone polyamide-imide battery binder has a structure shown in Formula I;

[0008]

[0009] Formula I;

[0010] wherein R1 is CF3 or H, and R2 is one of CF3, OH, OCH3 or H;

[0011] Ar1 is the residue of a monomer of an aromatic dianhydride;

[0012] Ar2 is the residue of a monomer of an aromatic diacyl chloride;

[0013] Ar3 is the residue of an aromatic diamine monomer;

[0014] n+m+x is 50 to 150;

[0015] (n+m):x is 1:0 to 1:1.

[0016] X may be 0, that is, the high-temperature resistant benzimidazolone polyamide-imide battery binder does not contain a structural unit having Ar3.

[0017] The high-temperature resistant benzimidazolone polyamide-imide battery binder is a fibrous polyamide-imide material.

[0018] Optionally, Ar1 is selected from at least one residue of an aromatic dianhydride monomer having the structural formula shown in Formula II;

[0019]

[0020] Ar1 is preferably One of them.

[0021] Optionally, Ar1 is selected from the residue of a monomer of at least one aromatic dianhydride selected from the group consisting of pyromellitic anhydride, 3,3',4,4'-biphenyltetracarboxylic dianhydride, 4,4'-biphenyl ether dianhydride, 3,3',4,4'-benzophenone tetracarboxylic dianhydride, 3,3',4,4'-diphenyl ether tetracarboxylic dianhydride, 3,3',4,4'-diphenyl sulfone tetracarboxylic dianhydride and 4,4-(hexafluoroisopropylene) diphthalic anhydride in organic dibasic acid anhydrides.

[0022] Optionally, Ar2 is selected from at least one residue of an aromatic diacyl chloride monomer having the structural formula shown in Formula III;

[0023]

[0024] Ar2 is preferably One of them.

[0025] Optionally, Ar2 is a residue of a monomer of at least one aromatic diacyl chloride selected from isophthaloyl chloride, terephthaloyl chloride, 2,6-naphthalene dicarboxylic acid chloride, and 4,4'-biphenyl diacetyl chloride.

[0026] Optionally, Ar3 is selected from at least one residue of an aromatic diamine monomer having the structural formula shown in Formula IV;

[0027]

[0028] Optionally, Ar3 is selected from 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl, 2-trifluoromethyl-4,4'-diaminodiphenyl ether, 5-trifluoromethyl-4,4'-diaminodiphenyl ether, 2,2'-bis(trifluoromethyl)-

[0029] - A residue of a monomer of at least one aromatic diamine selected from the group consisting of 4,4'-diaminophenyl ether, 3,3'-bis(trifluoromethyl)-4,4'-diaminodiphenylmethane, 4,4'-(hexafluoroisopropylidene)diphenylamine, and 3,3'-dimethyl-4,4'-(hexafluoroisopropylidene)diphenylamine.

[0030] According to the second aspect of the present application, a method for preparing the above-mentioned high-temperature resistant benzimidazolone polyamide-imide battery binder is provided, comprising the following steps:

[0031] S1. In an inert atmosphere at 0-5°C, trimethylsilyl chloride, 4-dimethylaminopyridine, and pyridine are added dropwise to a mixture containing an organic diamine and N,N-dimethylacetamide, and the mixture is reacted at 20-30°C to obtain a unilaterally silylated aromatic diamine solution.

[0032] Wherein, the organic diamine includes benzimidazolone diamine and an aromatic diamine having Ar3, and the molar ratio of the aromatic diamine having Ar3 to the benzimidazolone diamine is 0:1 to 1:1;

[0033] S2, reacting a mixture containing the unilaterally silylated aromatic diamine solution described in step S1 and the aromatic diacyl chloride having Ar2 at 0-5° C. for reaction II, and then heating to 20-30° C. for reaction III to obtain an amino-terminated polyamide oligomer;

[0034] S3, adding dimethylacetamide to a mixture containing the amino-terminated polyamide oligomer described in step S2 and the aromatic dianhydride having Ar1 at 0-5° C. to adjust the solid content of the mixture, then carrying out reaction IV at 0-5° C., and then heating to 20-30° C. to carry out reaction V to obtain a polyamide amic acid solution;

[0035] S4. Add acetic anhydride and pyridine dropwise to the polyamide amic acid solution in step S3, carry out reaction VI at room temperature, then raise the temperature to 80° C. to carry out reaction VII, precipitate the obtained product in methanol, filter, and dry to obtain the high-temperature resistant benzimidazolone polyamide-imide battery binder.

[0036] Optionally, in step S1, the benzimidazolone diamine is selected from at least one of 1,3-bis(4-aminophenyl)-2-benzimidazolone and 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone.

[0037] Optionally, in step S1, the solid content of the mixture is 15-25 wt%.

[0038] Optionally, in step S1, the conditions of reaction I include: reaction time is 15 to 20 minutes.

[0039] Optionally, in step S1, the molar ratio of the organic diamine to trimethylchlorosilane, 4-dimethylaminopyridine, and pyridine is 10:10:1:9.

[0040] Optionally, in step S2, the conditions of reaction II include: reaction time is 0.5 to 1.5 hours.

[0041] Optionally, in step S2, the conditions of reaction III include: a reaction time of 2.5 to 3.5 hours.

[0042] Optionally, the molar ratio of the aromatic diacyl chloride having Ar2 in step S2 to the organic diamine in step S1 is 0.4-0.6:0.8-1.2.

[0043] Optionally, the molar ratio of aromatic dicarboxylic acid chloride, aromatic dianhydride and organic diamine is 0.4-0.6:0.4-0.6:0.8-1.2.

[0044] Optionally, the molar ratio of the organic diamine:the total amount of the aromatic diacyl chloride and the aromatic dianhydride is 1:1.

[0045] Optionally, in step S3, the conditions of reaction IV include: reaction time is 1 h.

[0046] Optionally, in step S3, the conditions of reaction V include: a reaction time of 11 to 13 hours.

[0047] Optionally, in step S3, the solid content of the mixture is 7.5-12.5 wt%.

[0048] Optionally, the molar ratio of the aromatic dianhydride having Ar1 in step S3 to the organic diamine in step S1 is 0.4-0.6:0.8-1.2.

[0049] Optionally, the molar ratio of the total molar amount of the aromatic dianhydride having Ar1 in step S3 and the aromatic diacyl chloride having Ar2 in step S2 to the organic diamine in step S1 is 1 to 1.02:1.

[0050] Optionally, the molar ratio of acetic anhydride and pyridine in step S4 to the organic diamine in step S1 is 30:30:10.

[0051] Optionally, in step S4, the conditions of reaction VI include: a reaction time of 0.5 to 1 h.

[0052] Optionally, in step S4, the conditions for reaction VII include: a reaction time of 2 to 3 hours.

[0053] Optionally, in step S4, the drying conditions include: drying at 120-150° C. for 2-4 hours and then drying at 200-240° C. for 2-4 hours.

[0054] According to the third aspect of the present application, there is provided an application of the above-mentioned high-temperature resistant benzimidazolone polyamide-imide battery binder or the high-temperature resistant benzimidazolone polyamide-imide battery binder obtained according to the above-mentioned preparation method in the preparation of the diaphragm coating layer and positive and negative electrode sheets of lithium-ion batteries.

[0055] The high temperature resistant benzimidazolone polyamide-imide battery binder material has at least one of the following properties:

[0056] Glass transition temperature is greater than or equal to 380°C;

[0057] Initial decomposition temperature (T d5％ ) is greater than or equal to 300℃;

[0058] The residual carbon rate is greater than or equal to 50%.

[0059] Optionally, the high-temperature resistant benzimidazolone polyamide-imide battery binder is used as a lithium iron phosphate positive electrode binder for a lithium-ion battery, and the capacity is greater than or equal to 140 mAh at a current of 1 C, and the battery capacity is greater than or equal to 125 mAh after 200 cycles.

[0060] The beneficial effects of this application include:

[0061] (1) The present application provides a method for preparing a high-temperature resistant benzimidazolone polyamide-imide battery binder. By unilaterally activating an aromatic diamine with trimethylchlorosilane and altering the activity of amino groups on both sides, a high-temperature resistant benzimidazolone polyamide-imide battery binder with uniformly distributed amide and imide segments is prepared. Polyamide-imide itself is an engineering plastic with excellent overall performance, high mechanical strength, outstanding heat resistance, and a thermal decomposition temperature above 450°C. This effectively addresses the shortcomings of traditional binders, such as poor heat resistance and insufficient chemical stability.

[0062] (2) The high-temperature resistant benzimidazolone polyamide-imide battery binder prepared in this application improves the electrolyte wettability and ion transmission ability by introducing high polar groups; its solubility can be increased, thereby facilitating electrode formation; and it can form strong chemical bonds or physical adsorption with the positive and negative inorganic active materials, reducing structural damage during the cycle process. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 This is the H NMR spectrum of the high temperature resistant benzimidazolone polyamide-imide battery binder of Example 12;

[0064] Figure 2 This is the nuclear magnetic resonance fluorine spectrum of the high temperature resistant benzimidazolone polyamide-imide battery binder of Example 12;

[0065] Figure 3 is an infrared spectrum of the high temperature resistant benzimidazolone polyamide-imide battery binder of Example 12;

[0066] Figure 4 This is a dynamic thermal analysis result diagram of the high-temperature resistant benzimidazolone polyamide-imide battery binder of Example 12.

[0067] Figure 5 This is a thermogravimetric analysis (TG) result diagram of the high-temperature resistant benzimidazolone polyamide-imide battery binder of Example 12.

[0068] Figure 6 This is a battery cycle voltage-current curve of the high-temperature resistant benzimidazolone polyamide-imide battery binder of Example 12.

[0069] Figure 7 This is a battery cycle number-cycle specific capacity / efficiency curve of the high-temperature resistant benzimidazolone polyamide-imide battery binder of Example 12. DETAILED DESCRIPTION

[0070] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0071] Unless otherwise specified, the raw materials in the examples of this application were purchased through commercial channels.

[0072] Unless otherwise specified, conventional methods were used for testing, and instrument settings were those recommended by the manufacturer.

[0073] The test conditions and methods used in the examples of this application are:

[0074] Nuclear Magnetic Resonance Spectroscopy (NMR): 1 H NMR was measured on a Bruker AVANCE III 400 MHz NMR instrument, with tetramethylsilane (TMS) as the internal standard and DMSO-d6 as the solvent; 19 F NMR was measured on a Bruker AVANCE III 400 MHz NMR instrument, with tetramethylsilane (TMS) as the internal standard and DMSO-d6 as the solvent.

[0075] Fourier transform infrared (FT-IR) analysis: FT-IR spectra were obtained using a VERTEX70 at 4000 cm -1 to 400cm -1 tested within the wavelength range.

[0076] Dynamic Mechanical Analysis (DMA): Measurements were performed using a Q850 / Q800 DMA instrument manufactured by TA Instruments (USA). Test conditions were: sample size: 20 mm × 13 mm × 0.85 mm; test mode: tensile; atmosphere: nitrogen; temperature range: room temperature to 500 °C; frequency: 1 Hz; heating rate: 5 K / min.

[0077] Thermogravimetric analysis (TG): Measurements were performed using a NETZSCH TG209F1 thermogravimetric analyzer. Test conditions were: N2 atmosphere, a heating rate of 10°C / min, and a scanning range of 50-800°C. TG analysis revealed a T5% of 532.2°C and a T10% of 570.4°C.

[0078] Battery cycle test: 1 part of high-temperature resistant benzimidazolone polyamide-imide battery binder, 1 part of Ketjen black conductive agent, and 8 parts of lithium iron phosphate are mixed by ball milling with N-methylpyrrolidone as a dispersing solvent to prepare the slurry required for the positive electrode sheet. The prepared slurry is scraped onto battery-grade aluminum foil, vacuum-dried at 80°C for 12 hours, and then heated to 120°C for vacuum drying for 12 hours to obtain a lithium iron phosphate lithium-ion battery positive electrode sheet. The prepared positive electrode sheet is assembled with a lithium metal negative electrode, a PE battery separator, and a carbonate-based electrolyte (the electrolyte components are dimethyl carbonate: diethyl carbonate: ethyl methyl carbonate = 1:1:1, and the lithium salt is lithium hexafluorophosphate) to form a button cell for cycle testing. The test was performed using the LANHE test platform CT2001A of Wuhan Landian Electronics Co., Ltd. The test conditions are: 1C rate charge and discharge, and the test temperature is 25°C.

[0079] According to one embodiment, the preparation method of the high temperature resistant benzimidazolone polyamide-imide battery binder comprises the following steps:

[0080] a) Under nitrogen protection, an ice-water bath, and mechanical stirring, a total of 10 molar parts of an aromatic diamine having an Ar2 structure and benzimidazolone diamine (the ratio of the former to the latter is 0:1 to 1:1) are uniformly dissolved in N,N-dimethylacetamide (DMAc) (solid content is 15 to 25 wt%), and then 10 molar parts of trimethylchlorosilane (TMSCl), 1 molar part of 4-dimethylaminopyridine (DMAP), and 9 molar parts of pyridine are dropwise added at -5 to 25° C. and stirred for 15 minutes to obtain a unilaterally silylated aromatic diamine solution;

[0081]

[0082] b) stirring the unilaterally silylated aromatic diamine solution and 5 moles of aromatic diacyl chloride having an Ar3 structure at 0-5° C. for 0.5-1.5 hours, then heating to 20-30° C. and continuing stirring for 2.5-3.5 hours to obtain an amino-terminated polyamide oligomer;

[0083]

[0084] c) Subsequently, 5 mol parts of an aromatic dianhydride having an Ar1 structure were added in three batches at 0-5° C., and after complete dissolution, DMAc was added to adjust the solid content of the solution to 7.5-12.5 wt %. The resulting solution was stirred at 0-5° C. and 20-30° C. for 1 hour and 11-13 hours, respectively, to obtain a polyamide amic acid solution;

[0085]

[0086] d) adding 30 mol parts of acetic anhydride and 30 mol parts of pyridine mixture dropwise to the polyamide amic acid solution, stirring at room temperature for 0.5 to 1 hour, then heating to 80° C., stirring for 2 to 3 hours, cooling and precipitating in methanol to obtain a fibrous polyamide-imide material;

[0087]

[0088] e) The fibrous polyamide-imide is dried in the following manner: first drying at 120-150° C. for 2-4 hours and then drying at 200-240° C. for 2-4 hours.

[0089] According to one embodiment, the molar ratio of the aromatic dichloride, aromatic dianhydride and organic diamine is 0.4-0.6:0.4-0.6:0.8-1.2, preferably 0.5:0.5:1.02; the organic diamine includes benzimidazolone diamine and aromatic diamine, and the molar ratio of the two is 1:0-1:1; the mass of the aromatic dianhydride and aromatic diamine is preferably 15-25wt% of the total mass of the reactants.

[0090] According to one embodiment, the reactants are aromatic diamine, benzimidazolone diamine, aromatic dianhydride, aromatic diacyl chloride and N,N-dimethylacetamide.

[0091] According to one embodiment, the aromatic dianhydride is one or a mixture of at least two of pyromellitic anhydride, 3,3',4,4'-biphenyltetracarboxylic dianhydride, 4,4'-biphenyl ether dianhydride, 3,3',4,4'-benzophenone tetracarboxylic dianhydride, 3,3',4,4'-diphenyl ether tetracarboxylic dianhydride, 3,3',4,4'-diphenyl sulfone tetracarboxylic dianhydride and 4,4-(hexafluoroisopropylene) diphthalic anhydride, preferably 4,4'-biphenyl ether dianhydride, 3,3',4,4'-biphenyltetracarboxylic dianhydride or 4,4-(hexafluoroisopropylene) diphthalic anhydride.

[0092] According to one embodiment, the aromatic diamine is one or a mixture of at least two of 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl, 2-trifluoromethyl-4,4'-diaminodiphenyl ether, 5-trifluoromethyl-4,4'-diaminodiphenyl ether, 2,2'-bis(trifluoromethyl)-4,4'-diaminophenyl ether, 3,3'-bis(trifluoromethyl)-4,4'-diaminodiphenylmethane, 4,4'-(hexafluoroisopropylidene)diphenylamine and 3,3'-dimethyl 4,4'-(hexafluoroisopropylidene)diphenylamine, preferably 1,3-bis(4-aminophenyl)-2-benzimidazolone or 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone.

[0093] According to one embodiment, the benzimidazolone diamine is 1,3-bis(4-aminophenyl)-2-benzimidazolone or 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone.

[0094] According to one embodiment, the aromatic diacyl chloride is one or a mixture of at least two of isophthaloyl dichloride, terephthaloyl dichloride, 2,6-naphthalene dicarboxylic acid chloride, and 4,4'-biphenyl diacetyl chloride, preferably isophthaloyl dichloride or terephthaloyl dichloride.

[0095] Example 1

[0096] Under nitrogen protection, an ice-water bath, and mechanical stirring, 15.72 g of 1,3-bis(4-aminophenyl)-2-benzimidazolone was uniformly dissolved in N,N-dimethylacetamide. Then, 6.36 ml of trimethylsilyl chloride, 0.61 g of 4-dimethylaminopyridine, and 3.62 ml of pyridine were added dropwise at -5°C and stirred for 15 minutes to obtain a solution of unilaterally silylated 1,3-bis(4-aminophenyl)-2-benzimidazolone. This unilaterally silylated 1,3-bis(4-aminophenyl)-2-benzimidazolone solution was stirred with 4.97 g of terephthaloyl chloride at 0°C and 25°C for 1 hour and 3 hours, respectively. Subsequently, 7.91 g of 4,4'-biphenyl ether dianhydride was added in three portions at 0°C. After complete dissolution, N,N-dimethylacetamide was added to adjust the solids concentration of the solution to 10 wt%. The resulting solution was stirred at 0°C and 25°C for 1 and 11 hours, respectively, to obtain a polyamic acid imide solution. A mixture of 14.09 ml of acetic anhydride and 12.07 ml of pyridine was added dropwise to the polyamic acid imide solution and stirred for 30 minutes. The mixture was then heated to 80°C and stirred for 2 hours. After cooling, the mixture was precipitated in methanol and dried to obtain 25.81 g of a high-temperature resistant benzimidazolone polyamide-imide battery binder.

[0097] The structure of the high temperature resistant benzimidazolone polyamide-imide battery binder is as follows:

[0098]

[0099] Among them: n+m is 8, Ar1 is

[0100] Ar2 is

[0101] Example 2

[0102] Under nitrogen protection, an ice-water bath, and mechanical stirring, 31.44 g of 1,3-bis(4-aminophenyl)-2-benzimidazolone was uniformly dissolved in N,N-dimethylacetamide. Then, 12.72 ml of trimethylsilyl chloride, 1.22 g of 4-dimethylaminopyridine, and 7.24 ml of pyridine were added dropwise at -5°C and stirred for 15 minutes to obtain a solution of unilaterally silylated 1,3-bis(4-aminophenyl)-2-benzimidazolone. This solution of unilaterally silylated 1,3-bis(4-aminophenyl)-2-benzimidazolone was stirred with 9.95 g of terephthaloyl chloride at 0°C and 25°C for 1 hour and 3 hours, respectively. Subsequently, 15.01 g of 3,3',4,4'-biphenyltetracarboxylic dianhydride was added in three portions at 0°C. After complete dissolution, N,N-dimethylacetamide was added to adjust the solids concentration of the solution to 10 wt%. The resulting solution was stirred at 0 and 25°C for 1 and 11 hours, respectively, to obtain a polyamic acid imide solution. A mixture of 28.18 ml of acetic anhydride and 24.14 ml of pyridine was added dropwise to the polyamic acid imide solution, stirred for 30 minutes, then heated to 80°C and stirred for 2 hours. After cooling, the mixture was precipitated in methanol and dried to obtain 50.89 g of a high-temperature resistant benzimidazolone polyamide-imide battery binder.

[0103] The structure of the high temperature resistant benzimidazolone polyamide-imide battery binder is as follows:

[0104]

[0105] Among them: n+m is 8, Ar1 is

[0106] Ar2 is

[0107] Example 3

[0108] Under nitrogen protection, an ice-water bath, and mechanical stirring, 9.43 g of 1,3-bis(4-aminophenyl)-2-benzimidazolone was uniformly dissolved in N,N-dimethylacetamide. 3.82 ml of trimethylsilyl chloride, 0.37 g of 4-dimethylaminopyridine, and 2.17 ml of pyridine were then added dropwise at -5°C and stirred for 15 minutes to obtain a solution of unilaterally silylated 1,3-bis(4-aminophenyl)-2-benzimidazolone. This unilaterally silylated 1,3-bis(4-aminophenyl)-2-benzimidazolone solution was then stirred with 2.98 g of terephthaloyl chloride at 0°C and 25°C for 1 hour and 3 hours, respectively. Subsequently, 6.8 g of 4,4-(hexafluoroisopropylene)diphthalic anhydride was added in three portions at 0°C. After complete dissolution, N,N-dimethylacetamide was added to adjust the solids concentration of the solution to 10 wt%. The resulting solution was stirred at 0 and 25°C for 1 and 11 hours, respectively, to obtain a polyamic acid imide solution. A mixture of 8.45 ml of acetic anhydride and 7.24 ml of pyridine was added dropwise to the polyamic acid imide solution, stirred for 30 minutes, then heated to 80°C and stirred for 2 hours. After cooling, the mixture was precipitated in methanol and dried to obtain 17.34 g of a high-temperature resistant benzimidazolone polyamide-imide battery binder.

[0109] The structure of the high temperature resistant benzimidazolone polyamide-imide battery binder is as follows:

[0110]

[0111] Among them: n+m is 10, Ar1 is

[0112] Ar2 is

[0113] Example 4

[0114] Under nitrogen protection, an ice-water bath, and mechanical stirring, 3.82 g of 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone was uniformly dissolved in N,N-dimethylacetamide. Then, 1.27 ml of trimethylsilyl chloride, 0.12 g of 4-dimethylaminopyridine, and 0.72 ml of pyridine were added dropwise at -5°C and stirred for 15 minutes to obtain a solution of unilaterally silylated 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone. This solution of unilaterally silylated 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone was stirred with 0.99 g of terephthaloyl chloride at 0°C and 25°C for 1 hour and 3 hours, respectively. Subsequently, 1.58 g of 4,4'-biphenyl ether dianhydride was added in three portions at 0°C. After complete dissolution, N,N-dimethylacetamide was added to adjust the solids concentration of the solution to 10 wt%. The resulting solution was stirred at 0 and 25°C for 1 and 11 hours, respectively, to obtain a polyamic acid imide solution. A mixture of 2.82 ml of acetic anhydride and 2.41 ml of pyridine was added dropwise to the polyamic acid imide solution, stirred for 30 minutes, then heated to 80°C and stirred for 2 hours. After cooling, the mixture was precipitated in methanol and dried to obtain 5.78 g of a high-temperature resistant benzimidazolone polyamide-imide battery binder.

[0115] The structure of the high temperature resistant benzimidazolone polyamide-imide battery binder is as follows:

[0116]

[0117] Among them: n+m is 10, Ar1 is

[0118] Ar2 is

[0119] Example 5

[0120] Under nitrogen protection, an ice-water bath, and mechanical stirring, 7.65 g of 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone was uniformly dissolved in N,N-dimethylacetamide. Then, 2.54 ml of trimethylsilyl chloride, 0.24 g of 4-dimethylaminopyridine, and 1.45 ml of pyridine were added dropwise at -5°C and stirred for 15 minutes to obtain a solution of unilaterally silylated 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone. This solution of unilaterally silylated 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone was stirred with 1.99 g of terephthaloyl chloride at 0°C and 25°C for 1 hour and 3 hours, respectively. Subsequently, 3 g of 3,3',4,4'-biphenyltetracarboxylic dianhydride was added in three batches at 0°C. After complete dissolution, N,N-dimethylacetamide was added to adjust the solids concentration of the solution to 10 wt%. The resulting solution was stirred at 0 and 25°C for 1 and 11 hours, respectively, to obtain a polyamic acid imide solution. A mixture of 5.64 ml of acetic anhydride and 4.83 ml of pyridine was added dropwise to the polyamic acid imide solution, stirred for 30 minutes, then heated to 80°C and stirred for 2 hours. After cooling, the mixture was precipitated in methanol and dried to obtain 11.41 g of a high-temperature resistant benzimidazolone polyamide-imide battery binder.

[0121] The structure of the high temperature resistant benzimidazolone polyamide-imide battery binder is as follows:

[0122]

[0123] Among them: n+m is 12, Ar1 is

[0124] Ar2 is

[0125] Example 6

[0126] Under nitrogen protection, an ice-water bath, and mechanical stirring, 19.12 g of 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone was uniformly dissolved in N,N-dimethylacetamide. 6.36 ml of trimethylsilyl chloride, 0.61 g of 4-dimethylaminopyridine, and 3.62 ml of pyridine were then added dropwise at -5°C and stirred for 15 minutes to obtain a unilaterally silylated 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone solution. This unilaterally silylated 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone solution was then stirred with 4.97 g of terephthaloyl chloride at 0 and 25°C for 1 and 3 hours, respectively. Subsequently, 11.33 g of 4,4-(hexafluoroisopropylene) diphthalic anhydride was added in three batches at 0°C. After complete dissolution, N,N-dimethylacetamide was added to adjust the solid content concentration of the solution to 10 wt%. The resulting solution was stirred at 0 and 25°C for 1 and 11 hours, respectively, to obtain a polyamic acid imide solution. A mixture of 14.09 ml of acetic anhydride and 12.07 ml of pyridine was added dropwise to the above polyamic acid imide solution, stirred for 30 minutes, then heated to 80°C and stirred for 2 hours. After cooling, the mixture was precipitated in methanol and dried to obtain 31.97 g of a high-temperature resistant benzimidazolone polyamide-imide battery binder.

[0127] The structure of the high temperature resistant benzimidazolone polyamide-imide battery binder is as follows:

[0128]

[0129] Among them: n+m is 8, Ar1 is

[0130] Ar2 is

[0131] Example 7

[0132] Under nitrogen protection, an ice-water bath, and mechanical stirring, 12.58 g of 1,3-bis(4-aminophenyl)-2-benzimidazolone was uniformly dissolved in N,N-dimethylacetamide. 5.09 ml of trimethylsilyl chloride, 0.49 g of 4-dimethylaminopyridine, and 2.9 ml of pyridine were then added dropwise at -5°C and stirred for 15 minutes to obtain a solution of unilaterally silylated 1,3-bis(4-aminophenyl)-2-benzimidazolone. This unilaterally silylated 1,3-bis(4-aminophenyl)-2-benzimidazolone solution was then stirred with 3.98 g of isophthaloyl chloride at 0°C and 25°C for 1 hour and 3 hours, respectively. Subsequently, 6.33 g of 4,4'-biphenyl ether dianhydride was added in three portions at 0°C. After complete dissolution, N,N-dimethylacetamide was added to adjust the solids concentration of the solution to 10 wt%. The resulting solution was stirred at 0 and 25°C for 1 and 11 hours, respectively, to obtain a polyamic acid imide solution. A mixture of 11.27 ml of acetic anhydride and 9.66 ml of pyridine was added dropwise to the polyamic acid imide solution, stirred for 30 minutes, then heated to 80°C and stirred for 2 hours. After cooling, the mixture was precipitated in methanol and dried to obtain 20.65 g of a high-temperature resistant benzimidazolone polyamide-imide battery binder.

[0133] The structure of the high temperature resistant benzimidazolone polyamide-imide battery binder is as follows:

[0134]

[0135] Among them: n+m is 12, Ar1 is

[0136] Ar2 is

[0137] Example 8

[0138] Under nitrogen protection, an ice-water bath, and mechanical stirring, 3.14 g of 1,3-bis(4-aminophenyl)-2-benzimidazolone was uniformly dissolved in N,N-dimethylacetamide. Then, 1.27 ml of trimethylsilyl chloride, 0.12 g of 4-dimethylaminopyridine, and 0.72 ml of pyridine were added dropwise at -5°C and stirred for 15 minutes to obtain a solution of unilaterally silylated 1,3-bis(4-aminophenyl)-2-benzimidazolone. This unilaterally silylated 1,3-bis(4-aminophenyl)-2-benzimidazolone solution was stirred with 0.99 g of isophthaloyl chloride at 0°C and 25°C for 1 hour and 3 hours, respectively. Subsequently, 1.5 g of 3,3',4,4'-biphenyltetracarboxylic dianhydride was added in three portions at 0°C. After complete dissolution, N,N-dimethylacetamide was added to adjust the solids concentration of the solution to 10 wt%. The resulting solution was stirred at 0 and 25°C for 1 and 11 hours, respectively, to obtain a polyamic acid imide solution. A mixture of 2.82 ml of acetic anhydride and 2.41 ml of pyridine was added dropwise to the polyamic acid imide solution, stirred for 30 minutes, then heated to 80°C and stirred for 2 hours. After cooling, the mixture was precipitated in methanol and dried to obtain 5.09 g of a high-temperature resistant benzimidazolone polyamide-imide battery binder.

[0139] The structure of the high temperature resistant benzimidazolone polyamide-imide battery binder is as follows:

[0140]

[0141] Among them: n+m is 8, Ar1 is

[0142] Ar2 is

[0143] Example 9

[0144] Under nitrogen protection, an ice-water bath, and mechanical stirring, 6.29 g of 1,3-bis(4-aminophenyl)-2-benzimidazolone was uniformly dissolved in N,N-dimethylacetamide. Then, 2.54 ml of trimethylsilyl chloride, 0.24 g of 4-dimethylaminopyridine, and 1.45 ml of pyridine were added dropwise at -5°C and stirred for 15 minutes to obtain a solution of unilaterally silylated 1,3-bis(4-aminophenyl)-2-benzimidazolone. This unilaterally silylated 1,3-bis(4-aminophenyl)-2-benzimidazolone solution was stirred with 1.99 g of isophthaloyl chloride at 0°C and 25°C for 1 hour and 3 hours, respectively. Subsequently, 4.53 g of 4,4-(hexafluoroisopropylene)diphthalic anhydride was added in three portions at 0°C. After complete dissolution, N,N-dimethylacetamide was added to adjust the solids concentration of the solution to 10 wt%. The resulting solution was stirred at 0 and 25°C for 1 and 11 hours, respectively, to obtain a polyamic acid imide solution. A mixture of 5.64 ml of acetic anhydride and 4.83 ml of pyridine was added dropwise to the polyamic acid imide solution, stirred for 30 minutes, then heated to 80°C and stirred for 2 hours. After cooling, the mixture was precipitated in methanol and dried to obtain 11.56 g of a high-temperature resistant benzimidazolone polyamide-imide battery binder.

[0145] The structure of the high temperature resistant benzimidazolone polyamide-imide battery binder is as follows:

[0146]

[0147] Among them: n+m is 14, Ar1 is

[0148] Ar2 is

[0149] Example 10

[0150] Under nitrogen protection, an ice-water bath, and mechanical stirring, 7.65 g of 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone was uniformly dissolved in N,N-dimethylacetamide. Then, 2.54 ml of trimethylsilyl chloride, 0.24 g of 4-dimethylaminopyridine, and 1.45 ml of pyridine were added dropwise at -5°C and stirred for 15 minutes to obtain a solution of unilaterally silylated 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone. This solution of unilaterally silylated 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone was stirred with 1.99 g of isophthaloyl chloride at 0°C and 25°C for 1 hour and 3 hours, respectively. Subsequently, 3.16 g of 4,4'-biphenyl ether dianhydride was added in three portions at 0°C. After complete dissolution, N,N-dimethylacetamide was added to adjust the solids concentration of the solution to 10 wt%. The resulting solution was stirred at 0 and 25°C for 1 and 11 hours, respectively, to obtain a polyamic acid imide solution. A mixture of 5.64 ml of acetic anhydride and 4.83 ml of pyridine was added dropwise to the polyamic acid imide solution, stirred for 30 minutes, then heated to 80°C and stirred for 2 hours. After cooling, the mixture was precipitated in methanol and dried to obtain 11.55 g of a high-temperature resistant benzimidazolone polyamide-imide battery binder.

[0151] The structure of the high temperature resistant benzimidazolone polyamide-imide battery binder is as follows:

[0152]

[0153] Among them: n+m is 12, Ar1 is

[0154] Ar2 is

[0155] Example 11

[0156] Under nitrogen protection, an ice-water bath, and mechanical stirring, 3.82 g of 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone was uniformly dissolved in N,N-dimethylacetamide. 1.27 ml of trimethylsilyl chloride, 0.12 g of 4-dimethylaminopyridine, and 0.72 ml of pyridine were then added dropwise at -5°C and stirred for 15 minutes to obtain a unilaterally silylated 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone solution. This unilaterally silylated 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone solution was then stirred with 0.99 g of isophthaloyl chloride at 0 and 25°C for 1 and 3 hours, respectively. Subsequently, 1.5 g of 3,3',4,4'-biphenyltetracarboxylic dianhydride was added in three batches at 0°C. After complete dissolution, N,N-dimethylacetamide was added to adjust the solid content of the solution to 10 wt%. The resulting solution was stirred at 0°C and 25°C for 1 and 11 hours, respectively, to obtain a polyamic acid imide solution. A mixture of 2.82 ml of acetic anhydride and 2.41 ml of pyridine was added dropwise to the above polyamic acid imide solution and stirred for 30 minutes. The mixture was then heated to 80°C and stirred for 2 hours. After cooling, the mixture was precipitated in methanol and dried to obtain 5.7 g of a high-temperature resistant benzimidazolone polyamide-imide battery binder.

[0157] The structure of the high temperature resistant benzimidazolone polyamide-imide battery binder is as follows:

[0158]

[0159] Among them: n+m is 8, Ar1 is

[0160] Ar2 is

[0161] Example 12

[0162] Under nitrogen protection, an ice-water bath, and mechanical stirring, 19.12 g of 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone was uniformly dissolved in N,N-dimethylacetamide. Then, 6.36 ml of trimethylsilyl chloride, 0.61 g of 4-dimethylaminopyridine, and 3.62 ml of pyridine were added dropwise at -5°C and stirred for 15 minutes to obtain a unilaterally silylated 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone solution. The unilaterally silylated 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone solution was stirred with 4.97 g of isophthaloyl chloride at 0 and 25°C for 1 and 3 hours, respectively. Subsequently, 11.33 g of 4,4-(hexafluoroisopropylene) diphthalic anhydride was added in three batches at 0°C. After complete dissolution, N,N-dimethylacetamide was added to adjust the solid content concentration of the solution to 10 wt%. The resulting solution was stirred at 0 and 25°C for 1 and 11 hours, respectively, to obtain a polyamic acid imide solution. A mixture of 14.09 ml of acetic anhydride and 12.07 ml of pyridine was added dropwise to the above polyamic acid imide solution, stirred for 30 minutes, then heated to 80°C and stirred for 2 hours. After cooling, the mixture was precipitated in methanol and dried to obtain 31.97 g of a high-temperature resistant benzimidazolone polyamide-imide battery binder.

[0163] The structure of the high temperature resistant benzimidazolone polyamide-imide battery binder is as follows:

[0164]

[0165] Among them: n+m is 32, Ar1 is

[0166] Ar2 is

[0167] Example 13

[0168] Under nitrogen protection, an ice-water bath, and mechanical stirring, 9.56 g of 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone and 8.01 g of 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl were uniformly dissolved in N,N-dimethylacetamide. 6.36 ml of trimethylsilyl chloride, 0.61 g of 4-dimethylaminopyridine, and 3.62 ml of pyridine were then added dropwise at -5°C and stirred for 15 minutes to obtain a unilaterally silylated 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone solution. This unilaterally silylated 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone solution was then stirred with 4.97 g of isophthaloyl chloride at 0°C and 25°C for 1 hour and 3 hours, respectively. Subsequently, 11.33 g of 4,4-(hexafluoroisopropylene) diphthalic anhydride was added in three batches at 0°C. After complete dissolution, N,N-dimethylacetamide was added to adjust the solid content concentration of the solution to 10 wt%. The resulting solution was stirred at 0 and 25°C for 1 and 11 hours, respectively, to obtain a polyamic acid imide solution. A mixture of 14.09 ml of acetic anhydride and 12.07 ml of pyridine was added dropwise to the above polyamic acid imide solution, stirred for 30 minutes, then heated to 80°C and stirred for 2 hours. After cooling, the mixture was precipitated in methanol and dried to obtain 30.42 g of a high-temperature resistant benzimidazolone polyamide-imide battery binder.

[0169] The structure of the high temperature resistant benzimidazolone polyamide-imide battery binder is as follows:

[0170]

[0171] Among them: n+m is 8, Ar1 is

[0172] Ar2 is

[0173] Ar3 is

[0174] Example 14

[0175] Under nitrogen protection, an ice-water bath, and mechanical stirring, 3.15 g of 1,3-bis(4-aminophenyl)-2-benzimidazolone and 3.21 g of 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl were uniformly dissolved in N,N-dimethylacetamide. 2.54 ml of trimethylsilyl chloride, 0.24 g of 4-dimethylaminopyridine, and 1.45 ml of pyridine were then added dropwise at -5°C and stirred for 15 minutes to obtain a unilaterally silylated 1,3-bis(4-aminophenyl)-2-benzimidazolone solution. This unilaterally silylated 1,3-bis(4-aminophenyl)-2-benzimidazolone solution was then stirred with 1.99 g of isophthaloyl chloride at 0°C and 25°C for 1 hour and 3 hours, respectively. Subsequently, 4.53 g of 4,4-(hexafluoroisopropylene) diphthalic anhydride was added in three batches at 0°C. After complete dissolution, N,N-dimethylacetamide was added to adjust the solid content concentration of the solution to 10 wt%. The resulting solution was stirred at 0 and 25°C for 1 and 11 hours, respectively, to obtain a polyamic acid imide solution. A mixture of 5.64 ml of acetic anhydride and 4.83 ml of pyridine was added dropwise to the above polyamic acid imide solution, stirred for 30 minutes, then heated to 80°C and stirred for 2 hours. After cooling, the mixture was precipitated in methanol and dried to obtain 11.62 g of a high-temperature resistant benzimidazolone polyamide-imide battery binder.

[0176] The structure of the high temperature resistant benzimidazolone polyamide-imide battery binder is as follows:

[0177]

[0178] Among them: n+m is 8, Ar1 is

[0179] Ar2 is

[0180] Ar3 is

[0181] Test Case

[0182] The high temperature resistant benzimidazolone polyamide-imide battery binder prepared in Example 12 was tested as a typical example, and the results are as follows:

[0183] H NMR spectrum Figure 1 As shown, amide hydrogen at 10.8 ppm and anhydride hydrogen at 8.3 ppm indicate the correct synthesis of the polymer;

[0184] NMR fluorine spectrum Figure 2 As shown, the peak area ratio is 1:1, indicating that the ratio of aromatic diacid chloride: aromatic dianhydride is 1:1, indicating the correct synthesis of polyamide-imide;

[0185] Infrared spectrum such as Figure 3 As shown, 1718cm -1The corresponding C=O symmetrical stretching vibration in the imide ring is 1364 cm -1 Corresponding to the CN stretching vibration in the imide ring, indicating the correct formation of imide; 1669cm -1 Corresponding to C=O stretching vibration, 1252 cm -1 This corresponds to the superposition of CN stretching vibration and NH bending vibration, indicating the correct formation of the amide bond;

[0186] Dynamic thermal analysis results are shown in the figure Figure 4 As shown, 237.59 °C and 380.45 °C correspond to different glass transition temperatures of the amide segment and the imide segment;

[0187] Thermogravimetric analysis (TG) results are shown in the figure Figure 5 As shown, it exhibits high high temperature stability;

[0188] The battery cycle voltage-current curve is as follows Figure 6 As shown, it exhibits stable battery cycling performance;

[0189] The battery cycle number-cycle specific capacity / efficiency curve is as follows Figure 7 As shown, it exhibits good battery cycle efficiency and capacity retention.

[0190] After testing, the test results of Examples 1-11 and 13-14 are similar to that of Example 12.

[0191] The above descriptions are merely a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application discloses the preferred embodiments as above, they are not intended to limit the present application. Any technical personnel familiar with the present profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A high temperature resistant benzimidazolone polyamide-imide battery binder, characterized in that: The high temperature resistant benzimidazolone polyamide-imide battery binder has a structure shown in Formula I; wherein R1 is CF3 or H, and R2 is one of CF3, OH, OCH3 or H; Ar1 is the residue of a monomer of an aromatic dianhydride; Ar2 is the residue of a monomer of an aromatic diacyl chloride; Ar3 is the residue of an aromatic diamine monomer; n+m+x is 50 to 150; (n+m):x is 1:0 to 1:

1.

2. The high temperature resistant benzimidazolone polyamide-imide battery binder according to claim 1, characterized in that: Ar1 is selected from at least one residue of an aromatic dianhydride monomer having the structural formula shown in Formula II; Preferably, Ar1 is selected from the residue of a monomer of at least one aromatic dianhydride selected from the group consisting of pyromellitic anhydride, 3,3',4,4'-biphenyltetracarboxylic dianhydride, 4,4'-biphenyl ether dianhydride, 3,3',4,4'-benzophenone tetracarboxylic dianhydride, 3,3',4,4'-diphenyl ether tetracarboxylic dianhydride, 3,3',4,4'-diphenyl sulfone tetracarboxylic dianhydride and 4,4-(hexafluoroisopropylene) diphthalic anhydride among organic dibasic acid anhydrides.

3. The high temperature resistant benzimidazolone polyamide-imide battery binder according to claim 1, characterized in that: Ar2 is selected from at least one residue of an aromatic diacyl chloride monomer having the structural formula shown in Formula III; Preferably, Ar2 is a residue of a monomer of at least one aromatic diacyl chloride selected from isophthaloyl chloride, terephthaloyl chloride, 2,6-naphthalene dicarboxylic acid chloride, and 4,4'-biphenyl diacetyl chloride.

4. The high temperature resistant benzimidazolone polyamide-imide battery binder according to claim 1, characterized in that: Ar3 is selected from at least one residue of an aromatic diamine monomer having the structural formula shown in Formula IV; Preferably, Ar3 is a residue of a monomer of at least one aromatic diamine selected from 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl, 2-trifluoromethyl-4,4'-diaminodiphenyl ether, 5-trifluoromethyl-4,4'-diaminodiphenyl ether, 2,2'-bis(trifluoromethyl)-4,4'-diaminophenyl ether, 3,3'-bis(trifluoromethyl)-4,4'-diaminodiphenylmethane, 4,4'-(hexafluoroisopropylidene)diphenylamine and 3,3'-dimethyl-4,4'-(hexafluoroisopropylidene)diphenylamine.

5. The method for preparing the high temperature resistant benzimidazolone polyamide-imide battery binder according to any one of claims 1 to 4, characterized in that: The steps include: S1. In an inert atmosphere at 0-5°C, trimethylsilyl chloride, 4-dimethylaminopyridine, and pyridine are added dropwise to a mixture containing an organic diamine and N,N-dimethylacetamide, and reaction I is carried out at 20-30°C to obtain a unilaterally silylated aromatic diamine solution; Wherein, the organic diamine includes benzimidazolone diamine and an aromatic diamine having Ar3, and the molar ratio of the aromatic diamine having Ar3 to the benzimidazolone diamine is 0:1 to 1:1; S2, reacting a mixture containing the unilaterally silylated aromatic diamine solution described in step S1 and the aromatic diacyl chloride having Ar2 at 0-5° C. for reaction II, and then heating to 20-30° C. for reaction III to obtain an amino-terminated polyamide oligomer; S3, adding dimethylacetamide to the mixture containing the amino-terminated polyamide oligomer described in step S2 and the aromatic dianhydride having Ar1 at 0° C. to adjust the solid content of the mixture, then carrying out reaction IV at 0-5° C., and then heating to 20-30° C. to carry out reaction V to obtain a polyamide amic acid solution; S4. Add acetic anhydride and pyridine dropwise to the polyamide amic acid solution in step S3, carry out reaction VI at room temperature, then raise the temperature to 80° C. to carry out reaction VII, precipitate the obtained product in methanol, filter, and dry to obtain the high-temperature resistant benzimidazolone polyamide-imide battery binder.

6. The preparation method according to claim 5, characterized in that In step S1, the benzimidazolone diamine is selected from at least one of 1,3-bis(4-aminophenyl)-2-benzimidazolone and 1,3-bis(4-aminophenyl)-5-trifluoromethyl-2-benzimidazolone; Preferably, in step S1, the solid content of the mixture is 15-25 wt%; Preferably, in step S1, the conditions of reaction I include: reaction time of 15 to 20 min; Preferably, in step S1, the molar ratio of the organic diamine to trimethylchlorosilane, 4-dimethylaminopyridine, and pyridine is 10:10:1:

9.

7. The preparation method according to claim 5, characterized in that In step S2, the conditions of reaction II include: reaction time of 0.5 to 1.5 h; Preferably, in step S2, the conditions of reaction III include: reaction time of 2.5 to 3.5 h; preferably, the molar ratio of the aromatic dichloride having Ar2 in step S2 to the organic diamine in step S1 is 0.4 to 0.6:0.8 to 1.

2.

8. The preparation method according to claim 5, characterized in that In step S3, the conditions of reaction IV include: reaction time of 1 h; Preferably, in step S3, the conditions of reaction V include: a reaction time of 11 to 13 h; Preferably, in step S3, the solid content of the mixture is 7.5 to 12.5 wt%; Preferably, the molar ratio of the aromatic dianhydride having Ar1 in step S3 to the organic diamine in step S1 is 0.4-0.6:0.8-1.2; Preferably, the molar ratio of the total molar amount of the aromatic dianhydride having Ar1 in step S3 and the aromatic diacyl chloride having Ar2 in step S2 to the organic diamine in step S1 is 1 to 1.02:

1.

9. The preparation method according to claim 5, characterized in that The molar ratio of acetic anhydride, pyridine in step S4 to the organic diamine in step S1 is 30:30:10; Preferably, in step S4, the conditions of reaction VI include: a reaction time of 0.5 to 1 h; Preferably, in step S4, the conditions for reaction VII include: a reaction time of 2 to 3 h; Preferably, in step S4, the drying conditions include: drying at 120-150° C. for 2-4 hours and then drying at 200-240° C. for 2-4 hours.

10. Use of the high-temperature resistant benzimidazolone polyamide-imide battery binder according to any one of claims 1 to 4 or the high-temperature resistant benzimidazolone polyamide-imide battery binder obtained by the preparation method according to any one of claims 5 to 9 in preparing a separator coating layer and positive and negative electrode sheets of a lithium-ion battery, characterized in that: The high temperature resistant benzimidazolone polyamide-imide battery binder material has at least one of the following properties: Glass transition temperature is greater than or equal to 380°C; Initial decomposition temperature (T d5％ ) is greater than or equal to 300℃; The residual carbon rate is greater than or equal to 50%; Preferably, the high-temperature resistant benzimidazolone polyamide-imide battery binder is used as a lithium iron phosphate positive electrode binder for a lithium-ion battery, and has a capacity greater than or equal to 140 mAh at a current of 1 C, and a battery capacity greater than or equal to 125 mAh after 200 cycles.

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