Preparation method of sodium ion battery cell

Abstract

The invention relates to a preparation method of a sodium-ion battery cell. The lithium ion battery comprises a positive plate, a negative plate, a diaphragm and electrolyte, adding ferric sulfate, manganese sulfate, ammonium dihydrogen phosphate, sodium acetate and citric acid into deionized water, stirring and dissolving, dropwise adding the graphene oxide suspension, and stirring to obtain a mixed solution; heating and stirring the mixed solution, drying, and cooling to obtain gel; grinding the gel, heating and pre-sintering, and pressing into a wafer; continuously calcining at high temperature, cooling and grinding to obtain an active substance; stirring and mixing an active material, graphene, polyvinylidene fluoride, a dispersing agent and a dispersing aid, coating the surface of an aluminum foil with the mixture, and drying to obtain a positive plate; the sodium ion battery cell prepared by the invention shows excellent rate capability and cycling stability.

Description

Technical Field

[0001] The present invention relates to the technical field of sodium ion battery cells, and in particular to a method for preparing a sodium ion battery cell. Background Art

[0002] With the rapid development of the economy, the global demand for various resources is also increasing. There is an urgent need to solve problems such as insufficient energy supply and shortage of fossil fuels. The development of new energy has become one of the most important ways to solve the above problems. Energy conversion and storage systems are the core and key of new energy. In the past decade, new energy battery energy storage technology, especially lithium-ion batteries, has been rapidly improved. Lithium-ion batteries have the advantages of high energy density, excellent cycle performance, high operating voltage and high safety. They have been widely used in portable electronic devices, electric vehicles and other fields. This has also led to an increasing demand for lithium resources in the industry, pushing up the research and development and production costs of lithium-ion batteries. Therefore, seeking alternative lithium resources has become an urgent need for the development of the battery industry. Sodium-ion batteries have a similar working principle to lithium-ion batteries. They have high energy density, stable cycle performance and high safety, making them a potential alternative to lithium-ion batteries.

[0003] Chinese Patent CN115939404A: Provides a sodium-ion battery positive electrode slurry, a preparation method thereof, a sodium-ion battery positive electrode, a sodium-ion battery, and power equipment, relating to the field of sodium-ion batteries. The sodium-ion battery positive electrode slurry comprises a positive electrode active material, a conductive agent, a binder, a solvent, and an additive; the binder is SEBS rubber, the solvent comprises solvent oil, and the additive comprises a material containing a silicon-oxygen bond. The preparation method of the sodium-ion battery positive electrode slurry comprises: mixing the positive electrode active material, the conductive agent, the binder, the solvent, and the additive. The raw materials of the sodium-ion battery positive electrode include the sodium-ion battery positive electrode slurry.

[0004] Chinese patent CN115504522B: Provides a sodium-ion battery cathode material precursor and preparation method thereof, a sodium-ion battery cathode material, a sodium-ion battery, and electrical equipment, relating to the battery field. The sodium-ion battery cathode material precursor has a general chemical formula of NixMnyFe1-xy(OH)2, where 0.15≤x≤0.35 and 0.2≤y≤0.5; the sodium-ion battery cathode material precursor has a sulfur content of ≤4000 ppm and a Na / S mass ratio of ≤1.5.

[0005] Chinese Patent CN116588994B: It relates to the technical field of cathode materials for sodium-ion batteries. Specifically, it relates to a cathode precursor for sodium-ion batteries, a cathode material for sodium-ion batteries, its preparation method, and a sodium-ion battery. The cathode precursor for sodium-ion batteries has a core-shell structure. The core of the core-shell structure is a nickel-iron-manganese ternary precursor, and the shell of the core-shell structure is a copper oxide layer. The chemical formula of the nickel-iron-manganese ternary precursor is NixFeyMnz(OH)2, where 0 < x < 1, 0 < y < 1, 0 < z < 1, and x + y + z = 1. The nickel-iron-manganese ternary precursor includes at least one of the following characteristics: D10 = 1.8 - 3.5 μm; D50 = 3.0 - 5.5 μm; D90 = 5.0 - 7.0 μm; the tap density is 1.3 - 1.6 g / cm3; the specific surface area = 10 - 20 m2 / g.

[0006] For the sodium-ion battery cells prepared by the above patents and the prior art, the rate performance and cycle stability are poor, and the electrochemical performance needs to be further improved. Summary of the Invention

[0007] To solve the above problems, the present invention provides a preparation method for a sodium-ion battery cell, which includes: a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte. The preparation method of the positive electrode sheet is as follows:

[0008] S1: Add 5 - 10 parts of ferric sulfate, 0.1 - 0.5 parts of manganese sulfate, 1 - 5 parts of ammonium dihydrogen phosphate, 1 - 5 parts of sodium acetate, and 5 - 10 parts of citric acid to 10 - 20 parts of deionized water. After stirring and dissolving, drop 0.1 - 0.5 parts of graphene oxide suspension, and stir at room temperature for 8 - 12 h to obtain a mixed solution.

[0009] S2: After heating the mixed solution to 100 - 120 °C, stir for 90 - 120 min, dry, and then cool to room temperature to obtain a gel.

[0010] S3: After grinding the gel, heat and pre-calcine it under a nitrogen atmosphere, press it into a disc with a diameter of 15 mm, continue to calcine it at a high temperature under a nitrogen atmosphere, cool to room temperature, and then grind it to obtain an active material.

[0011] S4: Stir and mix 70 - 90 parts of active material, 2 - 7 parts of graphene, 1 - 5 parts of polyvinylidene fluoride, 1 - 5 parts of dispersant, and 0.06 - 0.1 parts of co-dispersant evenly, and then coat it on the surface of aluminum foil and dry it to obtain a positive electrode sheet.

[0012] The drying temperature in S2 is 140 - 160 °C, and the time is 8 - 12 h.

[0013] The pre-calcination temperature in S3 is 280 - 300 °C, and the time is 150 - 180 min.

[0014] The high-temperature calcination temperature of S3 is 450-500° C., and the time is 8-12 hours.

[0015] The dispersant is one of dimethyl sulfoxide, N,N-dimethylformamide, acetone, 1,3-dimethyl-2-imidazolidinone, N-methylpyrrolidone and 1-methyl-2-pyrrolidone.

[0016] The negative electrode plate is metallic sodium.

[0017] The diaphragm is made of polypropylene.

[0018] The electrolyte is prepared by dissolving sodium perchlorate in ethylene carbonate and diethyl carbonate in a volume ratio of 1:1, and adding fluoroethylene carbonate to form a mixed solution, wherein the concentration of NaClO4 in the electrolyte is 1 mol / L and the mass concentration of fluoroethylene carbonate is 5%.

[0019] The preparation method of the dispersant is as follows:

[0020] A1: Add 5-20 parts of 2-amino-1,3,5-triazine and 17-34 parts of 2-methacrylic acid zinc salt to 200-240 parts of N,N-dimethylformamide solvent, then add 0.5-2 parts of N,N'-dicyclohexylcarbodiimide as a catalyst, and react at 35-45°C for 2-4 hours to produce a condensation product of 2-amino-1,3,5-triazine and acrylic acid zinc salt;

[0021] A2: After the reaction is completed, the filtrate is filtered and the N,N-dimethylformamide solvent is removed by vacuum distillation. The filtrate is vacuum dried at 35-45°C for 5-7 hours to obtain a light yellow solid 2-amino-1,3,5-triazine-acrylic acid zinc salt condensate dispersant.

[0022] Reaction mechanism

[0023] Condensation Reaction Mechanism: In the condensation reaction, the amino group of 2-amino-1,3,5-triazine is highly nucleophilic, while the carbon atom of the carboxylic acid group of 2-methacrylic acid zinc salt is positively charged. After DCC activates the carboxylic acid, the amino nitrogen atom attacks the carbon atom of the carboxylic acid, forming a tetrahedral intermediate. This then rearranges and dehydrates, forming a condensation product via an amide bond.

[0024] Mechanism of interaction with cathode materials: The dispersant's triazine ring nitrogen atoms and zinc ions coordinate with the metal ions on the cathode material's surface, tightly adsorbing onto the surface of the active material particles. This reduces interparticle forces, inhibits agglomeration, and strengthens the binding force between the active material and the current collector. Furthermore, the zinc carboxylate structure improves electronic coupling with the conductive agent, reducing interfacial resistance.

[0025] Technical Effects

[0026] The present invention provides a method for preparing a sodium ion battery cell. Compared with the prior art, the present invention has the following significant effects:

[0027] 1. Significantly improve dispersion stability: 2-amino-1,3,5-triazine-acrylic acid zinc salt condensate dispersant, through its unique molecular structure and mechanism of action, effectively improves the dispersibility of sodium ion battery cathode materials, enhances the binding force between active materials and current collectors, and significantly improves the battery's cycle stability and rate performance.

[0028] 2. Improved Cycling Stability and Charge-Discharge Performance: The dual coordination enhances the bonding between the active material and the current collector, inhibiting volume changes during charge and discharge, and reducing active material shedding. Cycling tests show that batteries using this dispersant retain 98.5% of their specific capacity after 100 cycles at a 1C rate. DETAILED DESCRIPTION

[0029] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention object, the following is a detailed description in conjunction with examples and comparative examples:

[0030] Electrochemical Performance Testing: Constant current charge and discharge tests were conducted using a Xinwei battery testing system with a voltage range of 1.7-4.3V and a temperature of 25°C. Cyclic voltammetry (CV, voltage window 1.7-4.3V) and electrochemical impedance spectroscopy (EIS) were performed using an electrochemical workstation. The first-cycle discharge capacity was measured at a 0.05C rate, and the capacity retention was measured after 100 cycles at a 1C rate.

[0031] Example 1

[0032] A method for preparing a sodium ion battery cell, comprising: a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte; the method for preparing the positive electrode sheet is:

[0033] S1: Add 5 g of ferric sulfate, 0.1 g of manganese sulfate, 1 g of ammonium dihydrogen phosphate, 1 g of sodium acetate, and 5 g of citric acid to 10 g of deionized water, stir to dissolve, then dropwise add 0.1 g of graphene oxide suspension, and stir at room temperature for 8 h to obtain a mixed solution;

[0034] S2: The mixed solution was heated to 100°C, stirred for 90 minutes, dried, and cooled to room temperature to obtain a gel;

[0035] S3: After grinding the gel, pre-calcining it under a nitrogen atmosphere, pressing it into a disc with a diameter of 15 mm, calcining it at a high temperature under a nitrogen atmosphere, cooling it to room temperature, and grinding it to obtain the active material;

[0036] S4: 70 g of active material, 2 g of graphene, 1 g of polyvinylidene fluoride, 1 g of dispersant, and 0.06 g of dispersant were stirred and mixed evenly, and then coated on the surface of aluminum foil and dried to obtain a positive electrode sheet.

[0037] The drying temperature of S2 is 140° C. and the drying time is 8 hours.

[0038] The pre-firing temperature of S3 is 280° C. and the pre-firing time is 150 min.

[0039] The high-temperature calcination temperature of S3 is 450° C. and the time is 8 hours.

[0040] The dispersant is dimethyl sulfoxide.

[0041] The negative electrode plate is metallic sodium.

[0042] The diaphragm is made of polypropylene.

[0043] The electrolyte is prepared by dissolving sodium perchlorate in ethylene carbonate and diethyl carbonate in a volume ratio of 1:1, and adding fluoroethylene carbonate to form a mixed solution, wherein the concentration of NaClO4 in the electrolyte is 1 mol / L and the mass concentration of fluoroethylene carbonate is 5%.

[0044] The preparation method of the dispersant is as follows:

[0045] A1: 5 g of 2-amino-1,3,5-triazine and 17 g of 2-methacrylic acid zinc salt were added to 200 g of N,N-dimethylformamide solvent, followed by the addition of 0.5 g of N,N'-dicyclohexylcarbodiimide as a catalyst. The mixture was reacted at 35°C for 2 h to produce a 2-amino-1,3,5-triazine-acrylic acid zinc salt condensate.

[0046] A2: After the reaction is completed, the filtrate is filtered and the N,N-dimethylformamide solvent is removed by vacuum distillation. The filtrate is vacuum dried at 35°C for 5 hours to obtain a light yellow solid 2-amino-1,3,5-triazine-acrylic acid zinc salt condensate dispersant.

[0047] Example 2

[0048] A method for preparing a sodium ion battery cell, comprising: a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte; the method for preparing the positive electrode sheet is:

[0049] S1: Add 6 g of ferric sulfate, 0.2 g of manganese sulfate, 2 g of ammonium dihydrogen phosphate, 2 g of sodium acetate, and 6 g of citric acid to 14 g of deionized water, stir to dissolve, then dropwise add 0.2 g of graphene oxide suspension, and stir at room temperature for 9 h to obtain a mixed solution;

[0050] S2: The mixture was heated to 105°C, stirred for 100 min, dried, and cooled to room temperature to obtain a gel;

[0051] S3: After grinding the gel, pre-calcining it under a nitrogen atmosphere, pressing it into a disc with a diameter of 15 mm, calcining it at a high temperature under a nitrogen atmosphere, cooling it to room temperature, and grinding it to obtain the active material;

[0052] S4: 75 g of active material, 3 g of graphene, 2 g of polyvinylidene fluoride, 2 g of dispersant, and 0.07 g of dispersant were stirred and mixed evenly, and then coated on the surface of aluminum foil and dried to obtain a positive electrode sheet.

[0053] The drying temperature of S2 is 145° C. and the drying time is 9 hours.

[0054] The pre-firing temperature of S3 is 285° C. and the pre-firing time is 160 min.

[0055] The high-temperature calcination temperature of S3 is 460° C. and the time is 9 hours.

[0056] The dispersant is N,N-dimethylformamide.

[0057] The negative electrode plate is metallic sodium.

[0058] The diaphragm is made of polypropylene.

[0059] The electrolyte is prepared by dissolving sodium perchlorate in ethylene carbonate and diethyl carbonate in a volume ratio of 1:1, and adding fluoroethylene carbonate to form a mixed solution, wherein the concentration of NaClO4 in the electrolyte is 1 mol / L and the mass concentration of fluoroethylene carbonate is 5%.

[0060] The preparation method of the dispersant is as follows:

[0061] A1: Add 10 g of 2-amino-1,3,5-triazine and 21 g of 2-methacrylic acid zinc salt to 210 g of N,N-dimethylformamide solvent, then add 1 g of N,N'-dicyclohexylcarbodiimide as a catalyst. The mixture is reacted at 40°C for 3 h to produce a 2-amino-1,3,5-triazine-acrylic acid zinc salt condensate.

[0062] A2: After the reaction is completed, the filtrate is filtered and the N,N-dimethylformamide solvent is removed by vacuum distillation. The filtrate is vacuum dried at 40°C for 6 hours to obtain a light yellow solid 2-amino-1,3,5-triazine-acrylic acid zinc salt condensate dispersant.

[0063] Example 3

[0064] A method for preparing a sodium ion battery cell, comprising: a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte; the method for preparing the positive electrode sheet is:

[0065] S1: Add 8 g of ferric sulfate, 0.4 g of manganese sulfate, 4 g of ammonium dihydrogen phosphate, 4 g of sodium acetate, and 8 g of citric acid to 18 g of deionized water, stir to dissolve, then dropwise add 0.4 g of graphene oxide suspension, and stir at room temperature for 11 h to obtain a mixed solution;

[0066] S2: The mixture was heated to 115°C, stirred for 110 min, dried, and cooled to room temperature to obtain a gel;

[0067] S3: After grinding the gel, pre-calcining it under a nitrogen atmosphere, pressing it into a disc with a diameter of 15 mm, calcining it at a high temperature under a nitrogen atmosphere, cooling it to room temperature, and grinding it to obtain the active material;

[0068] S4: 85 g of active material, 6 g of graphene, 4 g of polyvinylidene fluoride, 4 g of dispersant, and 0.09 g of dispersant were stirred and mixed evenly, and then coated on the surface of aluminum foil and dried to obtain a positive electrode sheet.

[0069] The drying temperature of S2 is 155° C. and the drying time is 11 h.

[0070] The pre-firing temperature of S3 is 295° C. and the pre-firing time is 170 min.

[0071] The high-temperature calcination temperature of S3 is 490° C. and the time is 11 hours.

[0072] The dispersant is acetone.

[0073] The negative electrode plate is metallic sodium.

[0074] The diaphragm is made of polypropylene.

[0075] The electrolyte is prepared by dissolving sodium perchlorate in ethylene carbonate and diethyl carbonate in a volume ratio of 1:1, and adding fluoroethylene carbonate to form a mixed solution, wherein the concentration of NaClO4 in the electrolyte is 1 mol / L and the mass concentration of fluoroethylene carbonate is 5%.

[0076] The preparation method of the dispersant is as follows:

[0077] A1: Add 15 g of 2-amino-1,3,5-triazine and 28 g of 2-methacrylic acid zinc salt to 230 g of N,N-dimethylformamide solvent, then add 1.5 g of N,N'-dicyclohexylcarbodiimide as a catalyst. The mixture is reacted at 40°C for 3 h to produce a 2-amino-1,3,5-triazine-acrylic acid zinc salt condensate.

[0078] A2: After the reaction is completed, the filtrate is filtered and the N,N-dimethylformamide solvent is removed by vacuum distillation. The filtrate is vacuum dried at 40°C for 6 hours to obtain a light yellow solid 2-amino-1,3,5-triazine-acrylic acid zinc salt condensate dispersant.

[0079] Example 4

[0080] A method for preparing a sodium ion battery cell, comprising: a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte; the method for preparing the positive electrode sheet is:

[0081] S1: Add 10 g of ferric sulfate, 0.5 g of manganese sulfate, 5 g of ammonium dihydrogen phosphate, 5 g of sodium acetate, and 10 g of citric acid to 20 g of deionized water, stir to dissolve, then dropwise add 0.5 g of graphene oxide suspension, and stir at room temperature for 12 h to obtain a mixed solution;

[0082] S2: After heating the mixture to 120°C, stirring for 120 minutes, drying, and cooling to room temperature to obtain a gel;

[0083] S3: After grinding the gel, pre-calcining it under a nitrogen atmosphere, pressing it into a disc with a diameter of 15 mm, calcining it at a high temperature under a nitrogen atmosphere, cooling it to room temperature, and grinding it to obtain the active material;

[0084] S4: 90 g of active material, 7 g of graphene, 5 g of polyvinylidene fluoride, 5 g of dispersant, and 0.1 g of dispersant were stirred and mixed evenly, and then coated on the surface of aluminum foil and dried to obtain a positive electrode sheet.

[0085] The drying temperature of S2 is 160° C. and the drying time is 12 h.

[0086] The pre-firing temperature of S3 is 300° C. and the pre-firing time is 180 min.

[0087] The high-temperature calcination temperature of S3 is 500° C. and the time is 12 hours.

[0088] The dispersant is 1,3-dimethyl-2-imidazolidinone.

[0089] The negative electrode plate is metallic sodium.

[0090] The diaphragm is made of polypropylene.

[0091] The electrolyte is prepared by dissolving sodium perchlorate in ethylene carbonate and diethyl carbonate in a volume ratio of 1:1, and adding fluoroethylene carbonate to form a mixed solution, wherein the concentration of NaClO4 in the electrolyte is 1 mol / L and the mass concentration of fluoroethylene carbonate is 5%.

[0092] The preparation method of the dispersant is as follows:

[0093] A1: Add 20 g of 2-amino-1,3,5-triazine and 34 g of 2-methacrylic acid zinc salt to 240 g of N,N-dimethylformamide solvent, then add 2 g of N,N'-dicyclohexylcarbodiimide as a catalyst. The mixture is reacted at 45°C for 4 h to produce a 2-amino-1,3,5-triazine-acrylic acid zinc salt condensate.

[0094] A2: After the reaction is completed, the filtrate is filtered and the N,N-dimethylformamide solvent is removed by vacuum distillation. The filtrate is vacuum dried at 45°C for 7 hours to obtain a light yellow solid 2-amino-1,3,5-triazine-acrylic acid zinc salt condensate dispersant.

[0095] Comparative Example 1

[0096] No dispersant was added, and the other procedures were the same as in Example 1.

[0097] Comparative Example 2

[0098] The other steps were the same as in Example 1 except that 2-amino-1,3,5-triazine was not added.

[0099] Comparative Example 3

[0100] The other steps were the same as in Example 1 except that zinc 2-methacrylate was not added.

[0101] First cycle discharge specific capacity / mA·h / g Specific capacity retention rate / % Example 1 138.8 96.8 Example 2 139.5 97.3 Example 3 141.6 97.8 Example 4 143.1 98.5 Comparative Example 1 98.3 77.3 Comparative Example 2 118.9 89.6 Comparative Example 3 122.7 91.0

[0102] Through the data analysis of the above examples and comparative examples, the sodium ion battery cell prepared by the present invention exhibits excellent rate performance and cycle stability.

[0103] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a sodium ion battery cell, comprising: Positive electrode sheet, negative electrode sheet, diaphragm, electrolyte; The preparation method of the positive electrode sheet is as follows: S1: Add 5-10 parts of ferric sulfate, 0.1-0.5 parts of manganese sulfate, 1-5 parts of ammonium dihydrogen phosphate, 1-5 parts of sodium acetate, and 5-10 parts of citric acid to 10-20 parts of deionized water, stir to dissolve, then dropwise add 0.1-0.5 parts of graphene oxide suspension, and stir at room temperature for 8-12 hours to obtain a mixed solution; S2: heating the mixture to 100-120°C, stirring for 90-120 minutes, drying, and cooling to room temperature to obtain a gel; S3: After grinding the gel, pre-calcining it under a nitrogen atmosphere, pressing it into a disc with a diameter of 15 mm, calcining it at a high temperature under a nitrogen atmosphere, cooling it to room temperature, and grinding it to obtain the active material; S4: 70-90 parts of active material, 2-7 parts of graphene, 1-5 parts of polyvinylidene fluoride, 1-5 parts of dispersant, and 0.06-0.1 parts of dispersant are stirred and mixed evenly, and then coated on the surface of aluminum foil and dried to obtain a positive electrode sheet.

2. The method for preparing a sodium ion battery cell according to claim 1, wherein: The drying temperature of S2 is 140-160° C. and the drying time is 8-12 hours.

3. The method for preparing a sodium ion battery cell according to claim 1, wherein: The pre-calcination temperature of S3 is 280-300° C. and the pre-calcination time is 150-180 minutes.

4. The method for preparing a sodium ion battery cell according to claim 1, wherein: The high-temperature calcination temperature of S3 is 450-500° C., and the time is 8-12 hours.

5. The method for preparing a sodium ion battery cell according to claim 1, wherein: The dispersant is one of dimethyl sulfoxide, N,N-dimethylformamide, acetone, 1,3-dimethyl-2-imidazolidinone, N-methylpyrrolidone and 1-methyl-2-pyrrolidone.

6. The method for preparing a sodium ion battery cell according to claim 1, wherein: The negative electrode plate is metallic sodium.

7. The method for preparing a sodium ion battery cell according to claim 1, wherein: The diaphragm is made of polypropylene.

8. The method for preparing a sodium ion battery cell according to claim 1, wherein: The electrolyte is prepared by dissolving sodium perchlorate in ethylene carbonate and diethyl carbonate in a volume ratio of 1:1, and adding fluoroethylene carbonate to form a mixed solution, wherein the concentration of NaClO4 in the electrolyte is 1 mol / L and the mass concentration of fluoroethylene carbonate is 5%.

9. The method for preparing a sodium ion battery cell according to claim 1, wherein: The preparation method of the dispersant is as follows: A1: Add 5-20 parts of 2-amino-1,3,5-triazine and 17-34 parts of 2-methacrylic acid zinc salt to 200-240 parts of N,N-dimethylformamide solvent, then add 0.5-2 parts of N,N'-dicyclohexylcarbodiimide as a catalyst, and react at 35-45°C for 2-4 hours to produce a condensation product of 2-amino-1,3,5-triazine and acrylic acid zinc salt; A2: After the reaction is completed, the filtrate is filtered and the N,N-dimethylformamide solvent is removed by vacuum distillation. The filtrate is vacuum dried at 35-45°C for 5-7 hours to obtain a light yellow solid 2-amino-1,3,5-triazine-acrylic acid zinc salt condensate dispersant.