A peptizing agent for a new energy battery and a preparation method thereof

Abstract

The present invention relates to the technical field of battery debinding agents, and particularly relates to a debinding agent for new energy batteries and a preparation method thereof. The present invention prepares a debinding agent for new energy batteries with a relatively fast debinding rate by compounding a bio-based composite, polyacrylic acid, a cellulose mixture, a surfactant, a solvent and an antioxidant. Among them, the carboxyl groups in the polyacrylic acid molecules interact with the charges on the surface of the colloidal particles, which can weaken the interaction between the colloidal particles and promote the aggregation of the colloidal particles; the bio-based composite and the cellulose mixture molecules contain active groups such as carboxyl groups and hydroxyl groups, which can break the chemical bonds in the adhesive, reduce the adhesiveness of the adhesive, and form intermolecular hydrogen bonds and van der Waals forces, enhance the interaction force, and improve the structural stability of the debinding agent; the raw materials used in the present invention are easily available, and have good compatibility and biodegradability, with environmental benefits. Compared with the prior art, it has a broad application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of battery debinding agents, and particularly to a debinding agent for new energy batteries and a preparation method thereof. Background Art

[0002] New energy generally refers to renewable energy developed and utilized on the basis of new technologies, including solar energy, biomass energy, wind energy, geothermal energy, wave energy, ocean current energy, tidal energy, and the thermal cycle between the ocean surface and deep layers; in addition, there are also new energy such as hydrogen energy, biogas, alcohol, and methanol, which refer to energy forms that can replace traditional energy, such as solar energy, wind energy, water energy, and geothermal energy. In the field of new energy materials, especially in the manufacturing processes of photovoltaics, batteries, and advanced composite materials, the debinding agent, as a key auxiliary material, plays an indispensable role.

[0003] During the battery manufacturing process, an electrode sheet is coated with a layer of colloid to adhere active substances, electrode materials, current collectors, and other battery components. For example, polyvinylidene fluoride (PVDF) is the most commonly used oil-based binder in lithium-ion batteries, with good antioxidant and reduction ability and thermal stability; silicone rubber adhesives are used in the bonding of cover plates and battery sheets on spacecraft solar cells; perfluorinated copolymers (FEP), polyvinyl alcohol (PVA), and polytetrafluoroethylene (PTFE) adhesives are commonly used in the negative electrode forming process of nickel-metal hydride batteries. The choice of adhesive has a direct impact on the performance, safety, and durability of the battery. However, in the subsequent assembly process, this layer of colloid needs to be removed to facilitate the assembly of the electrode sheet and the contact of active substances. This requires the use of a debinding agent.

[0004] Traditional debinding agents are mainly composed of organic solvents, such as alcohols, ketones, ethers, etc. However, the existing debinding agents for new energy batteries have some deficiencies. First, these organic solvents have strong volatility and may cause harm to the environment and operators during use. Second, these organic solvents have low flash points, are flammable and explosive, increasing the safety risks during the production process. Third, some organic solvents are highly corrosive to equipment and may cause damage to production equipment. Finally, the debinding effect of these organic solvents is not ideal and may affect the performance of the battery.

[0005] In the prior art, some existing debinding agents for new energy batteries, such as the patent technology document CN118562566A, disclose a debinding agent for new energy batteries, which comprises the following raw materials in parts by mass: esterified polyvinyl alcohol, 5 - 10 parts; hydroxyethyl methyl cellulose, 3 - 7 parts; plant modifier, 5 - 10 parts; propylene glycol, 8 - 12 parts; xylene, the balance. The plant modifier comprises esterified cellulose, esterified lignin, esterified vegetable oil and esterified plant wax. By adding the plant modifier, the invention reduces the production cost and also has certain environmental protection benefits, but the debinding rate of the debinding agent in this invention needs to be improved.

[0006] Therefore, according to the relevant technologies described above, it is urgent to develop a debinding agent for new energy batteries with a relatively fast debinding rate and its preparation method. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a debinding agent for new energy batteries and its preparation method to solve the problem of the slow debinding rate of the debinding agent for new energy batteries in the prior art.

[0008] Based on the above purpose, the present invention provides a debinding agent for new energy batteries and its preparation method. A debinding agent for new energy batteries is prepared from the following raw materials in parts by mass:

[0009] Bio - based composite 1 - 3 parts, cellulose mixture 0.5 - 2 parts, polyacrylic acid 0.3 - 1.0 part, surfactant A 5 - 8 parts, surfactant B 7 - 12 parts, antioxidant 1 - 2 parts, solvent 78 - 86 parts;

[0010] The bio - based composite is obtained by mixing polylactic acid, starch, lignin, modified chitin and deionized water in a mass ratio of 2 - 3:3 - 6:2 - 3:5 - 8:2 - 5. The bio - based composite contains active groups, which can break the chemical bonds between adhesive molecules and improve the debinding rate of the debinding agent;

[0011] The cellulose mixture is obtained by mixing ethyl cellulose, hydroxymethyl cellulose and hydroxyethyl cellulose in a mass ratio of 4 - 8:2 - 6:2 - 6;

[0012] The surfactant A is any one of N - octyl pyrrolidone, diester phosphate, lauryl alcohol ether phosphate;

[0013] The surfactant B is any one of non - ionic alcohol ethoxylate, polyethyleneimine alkoxy compound, sodium perfluorononenyloxybenzenesulfonate.

[0014] Preferably, the preparation method of the modified chitin comprises the following steps:

[0015] Step A1. Hydrochloric acid is added to N,N-dimethylformamide. Chitin is added to a flask containing the hydrochloric acid-acidified N,N-dimethylformamide solution, and the mixture is stirred evenly. Then phthalic anhydride is added, and the mixture is heated and stirred to obtain mixture A.

[0016] Step A2. Sodium hydroxide is added to mixture A to neutralize the excess hydrochloric acid in mixture A, and the mixture is stirred evenly. Then phenol anhydride is added, and the mixture is heated and stirred to obtain mixture B.

[0017] Step A3. Sodium bicarbonate is added to mixture B, and the resulting gel is filtered, washed twice with deionized water, ground, and freeze-dried at -10°C for 4 - 4.5 h to obtain modified chitin.

[0018] Preferably, in step A1, the mass ratio of N,N-dimethylformamide, hydrochloric acid, chitin, and phthalic anhydride is 5 - 7:5 - 7:4 - 8:12 - 15.

[0019] The temperature during the heating and stirring is 55 - 60°C, and the stirring time is 2 - 2.5 h.

[0020] Preferably, in step A2, the mass ratio of mixture A, sodium hydroxide, and phenol anhydride is 4 - 7:2 - 3:16 - 20.

[0021] The temperature during the heating and stirring is 55 - 60°C, and the stirring time is 2.5 - 3 h.

[0022] In step A3, the mass ratio of mixture B to sodium bicarbonate is 5 - 8:7 - 10.

[0023] Preferably, the preparation method of the bio-based composite includes the following steps:

[0024] Polylactic acid, starch, lignin, modified chitin, and deionized water are ultrasonically treated for 10 - 15 min and stirred evenly to obtain the bio-based composite.

[0025] Preferably, the molecular weight of the polyacrylic acid is 30000 - 50000 g / mol. The carboxyl groups in the polyacrylic acid molecules interact with the charges on the surface of the colloidal particles, which can weaken the interaction force between the colloidal particles, promote the aggregation of the colloidal particles, and reduce the adhesiveness of the adhesive.

[0026] Preferably, the solvent is obtained by mixing N,N-dimethylformamide, dimethyl sulfoxide, xylene, and ethanol in a mass ratio of 5 - 8:5 - 8:20 - 30:10 - 12.

[0027] Preferably, the antioxidant is obtained by mixing dibutylhydroxytoluene and propyl gallate in a mass ratio of 3 - 7:10 - 15.

[0028] Preferably, the method for preparing the cellulose mixture comprises the following steps:

[0029] Mix ethyl cellulose, hydroxymethyl cellulose and hydroxyethyl cellulose evenly to obtain a cellulose mixture.

[0030] A method for preparing a peptizing agent for a new energy battery comprises the following steps:

[0031] Step S1. Add a bio-based composite to a reaction kettle containing a solvent, heat to 50 - 60 °C, stir for 40 - 60 min under a stirring rate of 30 - 60 r / min until evenly mixed, then add the cellulose mixture to the solution and stir until completely dissolved to obtain a mixture C;

[0032] Step S2. Add polyacrylic acid to the mixture C, continue stirring for 20 - 40 min, then add surfactant A, surfactant B and an antioxidant, stir for 55 - 75 min, and cool to room temperature to obtain the peptizing agent for a new energy battery.

[0033] Advantages of the present invention:

[0034] The present invention provides a peptizing agent for a new energy battery and a method for preparing the same. By compounding a bio-based composite, polyacrylic acid, a cellulose mixture, a surfactant and an antioxidant, the present invention prepares a peptizing agent for a new energy battery with a relatively fast peptizing rate.

[0035] Among them, the carboxyl groups in the polyacrylic acid molecules interact with the charges on the surface of the colloidal particles, which can weaken the interaction force between the colloidal particles, promote the aggregation of the colloidal particles, reduce the viscosity of the adhesive, and polyacrylic acid can be used as a dispersant to promote the uniformity of the antioxidant in the peptizing agent and increase the contact rate between the antioxidant and free radicals, thereby effectively improving the overall antioxidant capacity of the peptizing agent. The stability between the molecules of the peptizing agent is better, and the peptizing effect can be better exerted.

[0036] Both surfactant A and surfactant B can reduce the surface tension of the peptizing agent. Therefore, the peptizing agent has good wetting ability and permeability, and the interaction force between the peptizing agent and the adhesive molecules is also enhanced, and the peptizing rate is improved; Xylene and ethanol in the solvent are organic solvents with good volatility and solubility. Using the principle of similar solubility in the peptizing agent, the solubility of substances such as polyacrylic acid is improved, and it also has good compatibility with them and is easy to remove.

[0037] The bio-based composite and cellulose mixture molecules contain active groups such as carboxyl groups and hydroxyl groups. On the one hand, they may chemically react with the adhesive molecules, causing the chemical bonds in the adhesive to break. It may form intermolecular hydrogen bonds and van der Waals forces, enhancing the mutual force and improving the structural stability of the debonding agent. On the other hand, while the bio-based composite and cellulose mixture are inexpensive in raw materials and have good compatibility, they also have good biodegradability, which also plays a significant role in environmental protection. Therefore, the debonding agent for new energy batteries prepared in the present invention has relatively good overall compatibility, good stability, and a relatively fast debonding rate. Compared with the prior art, it has broad application prospects. Detailed implementation manners

[0038] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the following further details the present invention in conjunction with specific embodiments.

[0039] The sources and properties of some raw materials used in the present invention are as follows:

[0040] Chitin was purchased from Jiangsu Bernath New Materials Co., Ltd.; hydrochloric acid was purchased from Xilong Scientific Co., Ltd.; N,N-dimethylformamide was purchased from Wuhan Kemike Biopharmaceutical Technology Co., Ltd.; phthalic anhydride was purchased from Shijiazhuang Bailong Chemical Industry Co., Ltd.; sodium hydroxide was purchased from Dunhuang Mingduo Chemical Industry Co., Ltd.; phenol anhydride was purchased from Panjin Qilu Chemical Industry Co., Ltd.; sodium bicarbonate was purchased from Wuhan Jixin Yibang Biotechnology Co., Ltd.; polyacrylic acid was purchased from Shanghai Yiji Biochemical Reagent Co., Ltd.; corn starch was purchased from China Starch Holdings Co., Ltd.; lignin was purchased from Hubei Xinkang Pharmaceutical Chemical Co., Ltd.; carboxymethyl cellulose was purchased from Nantong Runfeng Petrochemical Co., Ltd.; dimethyl sulfoxide was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.; sodium dodecylbenzenesulfonate was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.; dibutylhydroxytoluene was purchased from Yuanzheng Bioengineering Co., Ltd.; propyl gallate was purchased from Hebei Kelongduo Biotechnology Co., Ltd.; N-octylpyrrolidone was purchased from Hubei Maikaisi Fine Chemical Technology Co., Ltd.

[0041] Example 1: A preparation method of a debonding agent for new energy batteries, comprising the following steps:

[0042] S1. Add 5 g of hydrochloric acid to 5 g of N,N-dimethylformamide, add 4 g of chitin to a flask containing the hydrochloric acid-acidified N,N-dimethylformamide solution, mix evenly, and then add 12 g of phthalic anhydride. Heat and stir at 55 °C for 2.5 h to obtain mixture A;

[0043] S2. Add 2 g of sodium hydroxide to 4 g of mixture A, stir evenly, and then add 16 g of phenol anhydride. Heat and stir at 55 °C for 3 h to obtain mixture B;

[0044] S3. Add 7 g of sodium bicarbonate to 5 g of mixture B, filter to obtain a gel, wash it twice with deionized water, grind it, and freeze-dry it at -10 °C for 4 h to obtain modified chitin;

[0045] S4. Ultrasonically treat 2 g of polylactic acid, 3 g of starch, 2 g of lignin, 5 g of modified chitin, and 2 g of deionized water for 10 min, and mix them evenly to obtain a bio-based composite;

[0046] S5. Mix 4 g of ethyl cellulose, 2 g of carboxymethyl cellulose, and 2 g of hydroxyethyl cellulose evenly to obtain a cellulose mixture;

[0047] S6. Add 1 g of the bio-based composite to a reaction kettle containing 78 g of solvent, heat it to 50 °C, stir it for 60 min at a stirring rate of 60 r / min, mix it evenly, then add 0.5 g of the cellulose mixture to the solution, and stir until it is completely dissolved to obtain mixture C;

[0048] S7. Add 0.3 g of polyacrylic acid to mixture C, continue stirring for 20 min, then add 5 g of N-octylpyrrolidone, 7 g of fatty alcohol polyoxyethylene ether-9, and 1 g of antioxidant, stir for 55 min, and cool to room temperature to obtain a peptizing agent for new energy batteries.

[0049] Example 2: A preparation method of a peptizing agent for new energy batteries, comprising the following steps:

[0050] S1. Add 6 g of hydrochloric acid to 5 g of N,N-dimethylformamide, add 5 g of chitin to a flask containing the hydrochloric acid-acidified N,N-dimethylformamide solution, mix it evenly, then add 12 g of phthalic anhydride, and heat and stir at 57 °C for 2.5 h to obtain mixture A;

[0051] S2. Add 2 g of sodium hydroxide to 5 g of mixture A, stir it evenly, then add 18 g of phenol anhydride, and heat and stir at 56 °C for 3 h to obtain mixture B;

[0052] S3. Add 8 g of sodium bicarbonate to 5 g of mixture B, filter to obtain a gel, wash it twice with deionized water, grind it, and freeze-dry it at -10 °C for 4 h to obtain modified chitin;

[0053] S4. Ultrasonically treat 3 g of polylactic acid, 3 g of starch, 3 g of lignin, 8 g of modified chitin, and 5 g of deionized water for 10 min, and mix them evenly to obtain a bio-based composite;

[0054] S5. Mix 4 g of ethyl cellulose, 6 g of carboxymethyl cellulose, and 6 g of hydroxyethyl cellulose evenly to obtain a cellulose mixture;

[0055] S6. Add 1 g of the bio-based composite to a reaction kettle containing 80 g of solvent, heat to 50 °C, stir for 45 min at a stirring rate of 35 r / min until evenly mixed, then add 2 g of the cellulose mixture to the solution and stir until completely dissolved to obtain mixture C;

[0056] S7. Add 1.0 g of polyacrylic acid to mixture C, continue stirring for 25 min, then add 8 g of N-octylpyrrolidone, 12 g of fatty alcohol polyoxyethylene ether-9 and 2 g of antioxidant, stir for 60 min, and cool to room temperature to obtain the peptizing agent for new energy batteries.

[0057] Example 3: A preparation method of a peptizing agent for new energy batteries, comprising the following steps:

[0058] S1. Add 7 g of hydrochloric acid to 5 g of N,N-dimethylformamide, add 6 g of chitin to a flask containing the hydrochloric acid-acidified N,N-dimethylformamide solution, mix evenly, then add 13 g of phthalic anhydride, heat and stir at 58 °C for 2.5 h to obtain mixture A;

[0059] S2. Add 2 g of sodium hydroxide to 6 g of mixture A, stir evenly, then add 18 g of phenol anhydride, heat and stir at 57 °C for 3 h to obtain mixture B;

[0060] S3. Add 10 g of sodium bicarbonate to 5 g of mixture B, filter to obtain a gel, wash it twice with deionized water, grind it and place it in a freeze dryer at -10 °C for 4 h to obtain modified chitin;

[0061] S4. Ultrasonically treat 2 g of polylactic acid, 6 g of starch, 2 g of lignin, 7 g of modified chitin and 4 g of deionized water for 10 - 15 min and mix evenly to obtain the bio-based composite;

[0062] S5. Mix 8 g of ethyl cellulose, 2 g of hydroxymethyl cellulose and 6 g of hydroxyethyl cellulose evenly to obtain the cellulose mixture;

[0063] S6. Add 3 g of the bio-based composite to a reaction kettle containing 82 g of solvent, heat to 55 °C, stir for 50 min at a stirring rate of 40 r / min until evenly mixed, then add 0.5 g of the cellulose mixture to the solution and stir until completely dissolved to obtain mixture C;

[0064] S7. Add 0.3 g of polyacrylic acid to mixture C, continue stirring for 30 min, then add 5 g of N-octylpyrrolidone, 7 g of fatty alcohol polyoxyethylene ether-9 and 1 g of antioxidant, stir for 60 min, and cool to room temperature to obtain the peptizing agent for new energy batteries.

[0065] Example 4: A preparation method of a peptizing agent for a new energy battery, comprising the following steps:

[0066] S1. Add 5 g of hydrochloric acid to 6 g of N,N-dimethylformamide. Add 6 g of chitin to a flask containing the hydrochloric acid acidified N,N-dimethylformamide solution, mix evenly, then add 14 g of phthalic anhydride, and heat and stir at 58 °C for 2.5 h to obtain mixture A;

[0067] S2. Add 2.5 g of sodium hydroxide to 4 g of mixture A, stir evenly, then add 18 g of phenol anhydride, and heat and stir at 58 °C for 3 h to obtain mixture B;

[0068] S3. Add 7 g of sodium bicarbonate to 7 g of mixture B, filter to obtain a gel, wash it twice with deionized water, grind it, and place it in a freeze dryer at -10 °C for 4.5 h to obtain modified chitin;

[0069] S4. Ultrasonically treat 3 g of polylactic acid, 5 g of starch, 2.5 g of lignin, 5 g of modified chitin and 3 g of deionized water for 12 min, and mix evenly to obtain a bio-based composite;

[0070] S5. Mix 8 g of ethyl cellulose, 6 g of hydroxymethyl cellulose and 2 g of hydroxyethyl cellulose evenly to obtain a cellulose mixture;

[0071] S6. Add 2 g of the bio-based composite to a reaction kettle containing 84 g of a solvent, heat to 60 °C, stir at a stirring rate of 45 r / min for 50 min, mix evenly, then add 1 g of the cellulose mixture to the solution, and stir until completely dissolved to obtain mixture C;

[0072] S7. Add 0.8 g of polyacrylic acid to mixture C, continue to stir for 35 min, then add 6 g of N-octylpyrrolidone, 9 g of fatty alcohol polyoxyethylene ether-9 and 1.5 g of antioxidant, stir for 65 min, and cool to room temperature to obtain the peptizing agent for the new energy battery.

[0073] Example 5: A preparation method of a peptizing agent for a new energy battery, comprising the following steps:

[0074] S1. Add 6 g of hydrochloric acid to 6 g of N,N-dimethylformamide. Add 7 g of chitin to a flask containing the hydrochloric acid acidified N,N-dimethylformamide solution, mix evenly, then add 15 g of phthalic anhydride, and heat and stir at 60 °C for 2 h to obtain mixture A;

[0075] S2. Add 2.5 g of sodium hydroxide to 7 g of mixture A, stir evenly, then add 20 g of phenol anhydride, and heat and stir at 59 °C for 2.5 h to obtain mixture B;

[0076] S3. Add 10 g of sodium bicarbonate to 7 g of mixture B, filter to obtain a gel, wash it twice with deionized water, grind it, and place it in a freeze dryer at -10 °C for 4.5 h to obtain modified chitin;

[0077] S4. Ultrasonically treat 2.5 g of polylactic acid, 5 g of starch, 2.5 g of lignin, 7 g of modified chitin, and 3 g of deionized water for 15 min, and mix them evenly to obtain a bio-based composite;

[0078] S5. Mix 6 g of ethyl cellulose, 4 g of hydroxymethyl cellulose, and 4 g of hydroxyethyl cellulose evenly to obtain a cellulose mixture;

[0079] S6. Add 2 g of the bio-based composite to a reaction kettle containing 84 g of solvent, heat it to 60 °C, stir it at a stirring rate of 60 r / min for 40 min, mix it evenly, then add 2 g of the cellulose mixture to the solution, and stir until it is completely dissolved to obtain mixture C;

[0080] S7. Add 0.5 g of polyacrylic acid to mixture C, continue stirring for 40 min, then add 7 g of N-octylpyrrolidone, 10 g of fatty alcohol polyoxyethylene ether-9, and 2 g of antioxidant, stir for 75 min, and cool to room temperature to obtain a peptizing agent for new energy batteries.

[0081] Example 6: A preparation method of a peptizing agent for new energy batteries, comprising the following steps:

[0082] S1. Add 7 g of hydrochloric acid to 7 g of N,N-dimethylformamide, add 8 g of chitin to a flask containing the hydrochloric acid-acidified N,N-dimethylformamide solution, mix it evenly, then add 15 g of phthalic anhydride, and heat and stir at 60 °C for 2 h to obtain mixture A;

[0083] S2. Add 3 g of sodium hydroxide to 4 g of mixture A, stir it evenly, then add 16 g of phenol anhydride, and heat and stir at 60 °C for 2.5 h to obtain mixture B;

[0084] S3. Add 7 g of sodium bicarbonate to 8 g of mixture B, filter to obtain a gel, wash it twice with deionized water, grind it, and place it in a freeze dryer at -10 °C for 4.5 h to obtain modified chitin;

[0085] S4. Ultrasonically treat 3 g of polylactic acid, 6 g of starch, 2 g of lignin, 8 g of modified chitin, and 3 g of deionized water for 15 min, and mix them evenly to obtain a bio-based composite;

[0086] S5. Mix 6 g of ethyl cellulose, 4 g of hydroxymethyl cellulose, and 4 g of hydroxyethyl cellulose evenly to obtain a cellulose mixture;

[0087] S6. Add 3 g of the bio-based composite to a reaction kettle containing 86 g of solvent, heat to 60 °C, stir for 40 min at a stirring rate of 60 r / min until evenly mixed, then add 2 g of the cellulose mixture to the solution and stir until completely dissolved to obtain mixture C;

[0088] S7. Add 0.3 g of polyacrylic acid to mixture C, continue stirring for 40 min, then add 8 g of N-octylpyrrolidone, 7 g of fatty alcohol polyoxyethylene ether-9 and 1 g of antioxidant, stir for 70 min, and cool to room temperature to obtain the peptizing agent for new energy batteries.

[0089] Example 7: A preparation method of a peptizing agent for new energy batteries, comprising the following steps:

[0090] S1. Add 5 g of hydrochloric acid to 7 g of N,N-dimethylformamide, add 8 g of chitin to a flask containing the hydrochloric acid-acidified N,N-dimethylformamide solution, mix evenly, then add 12 g of phthalic anhydride, and heat and stir at 60 °C for 2.5 h to obtain mixture A;

[0091] S2. Add 3 g of sodium hydroxide to 7 g of mixture A, stir evenly, then add 20 g of phenol anhydride, and heat and stir at 60 °C for 2.5 h to obtain mixture B;

[0092] S3. Add 10 g of sodium bicarbonate to 8 g of mixture B, filter to obtain a gel, wash it twice with deionized water, grind it, and place it in a freeze dryer at -10 °C for 4.5 h to obtain modified chitin;

[0093] S4. Ultrasonically treat 3 g of polylactic acid, 5 g of starch, 3 g of lignin, 6 g of modified chitin and 5 g of deionized water for 15 min, and mix evenly to obtain a bio-based composite;

[0094] S5. Mix 4 g of ethyl cellulose, 4 g of carboxymethyl cellulose and 4 g of hydroxyethyl cellulose evenly to obtain a cellulose mixture;

[0095] S6. Add 2.5 g of the bio-based composite to a reaction kettle containing 86 g of solvent, heat to 60 °C, stir for 45 min at a stirring rate of 55 r / min until evenly mixed, then add 1 g of the cellulose mixture to the solution and stir until completely dissolved to obtain mixture C;

[0096] S7. Add 0.7 g of polyacrylic acid to mixture C, continue stirring for 40 min, then add 8 g of N-octylpyrrolidone, 9 g of fatty alcohol polyoxyethylene ether-9 and 2 g of antioxidant, stir for 75 min, and cool to room temperature to obtain the peptizing agent for new energy batteries.

[0097] Comparative Example 1:

[0098] In this comparative example, compared with Example 1, polyacrylic acid was not added during the preparation of the peptizing agent for new energy batteries, and the remaining steps and parameters were the same. This comparative example will not be repeated here, and finally, a peptizing agent for new energy batteries was obtained.

[0099] Comparative Example 2:

[0100] In this comparative example, compared with Example 1, the bio-based composite was not added during the preparation of the peptizing agent for new energy batteries, and the remaining steps and parameters were the same. This comparative example will not be repeated here, and finally, a peptizing agent for new energy batteries was obtained.

[0101] Comparative Example 3:

[0102] In this comparative example, compared with Example 1, the cellulose mixture was not added during the preparation of the peptizing agent for new energy batteries, and the remaining steps and parameters were the same. This comparative example will not be repeated here, and finally, a peptizing agent for new energy batteries was obtained.

[0103] Comparative Example 4:

[0104] In this comparative example, compared with Example 1, only "N-octylpyrrolidone" was replaced with "an equal amount of fatty alcohol polyoxyethylene ether-9", and the remaining steps and parameters were the same. This comparative example will not be repeated here, and finally, a peptizing agent for new energy batteries was obtained.

[0105] Comparative Example 5:

[0106] In this comparative example, compared with Example 1, only "fatty alcohol polyoxyethylene ether-9" was replaced with "an equal amount of N-octylpyrrolidone", and the remaining steps and parameters were the same. This comparative example will not be repeated here, and finally, a peptizing agent for new energy batteries was obtained.

[0107] Performance test:

[0108] Environmental protection performance test:

[0109] Take 100 g of the peptizing agents for new energy batteries prepared in Examples 1-7 and Comparative Examples 1-5 respectively, and conduct organic matter content tests. According to the test results, calculate the organic matter emissions of each peptizing agent;

[0110] Conductivity test: Take 100 g of the peptizing agents for new energy batteries prepared in Examples 1-7 and Comparative Examples 1-5 respectively, and test them using a DC resistance tester;

[0111] Non-flammability test:

[0112] Take 100 g of the peptizing agents for new energy batteries prepared in Examples 1-7 and Comparative Examples 1-5 respectively, conduct a combustion test, and observe whether each peptizing agent burns;

[0113] Debonding speed test: 100 g of the debonding agent for new energy batteries prepared in Examples 1 - 7 and Comparative Examples 1 - 5 were respectively taken and applied on the standard adhesive, and then the debonding speed test was carried out in a constant temperature and humidity environment, and the debonding situation of the debonding agent was recorded respectively;

[0114] Table 1 Summary of experimental data in Examples 1 - 7 and Comparative Examples 1 - 5

[0115] Project Organic matter emission (mg / L) Resistance value (Ω) Combustion Debinding time Example 1 47.9 1179 No 35.6 Example 2 42.5 1250 No 36.9 Example 3 46.3 1224 No 32.5 Example 4 46.8 1165 No 32.9 Example 5 48.2 1147 No 37.8 Example 6 43.1 1085 No 34.6 Example 7 45.9 1348 No 35.5 Comparative Example 1 61.3 932 Yes 48.6 Comparative Example 2 64.7 903 Yes 50.3 Comparative Example 3 59.3 921 Yes 54.7 Comparative Example 4 64.6 854 Yes 49.6 Comparative Example 5 63.9 972 Yes 52.4

[0116] Data analysis:

[0117] As can be seen from Table 1, the debonding agent for new energy batteries prepared by the present invention has a faster debonding rate. This may be because the carboxyl groups in the polyacrylic acid molecules interact with the charges on the surface of the colloidal particles, which can weaken the intermolecular forces between the colloidal particles, promote the aggregation of the colloidal particles, and reduce the viscosity of the adhesive; the bio - based composite and cellulose mixture molecules contain active groups such as carboxyl and hydroxyl groups. On the one hand, they may react chemically with the adhesive molecules, causing the chemical bonds in the adhesive to break, and may form intermolecular hydrogen bonds and van der Waals forces, enhancing the intermolecular forces and improving the structural stability of the debonding agent. On the other hand, they may also form chemical bonds with the battery materials, improving the discharge performance of the battery. At the same time, the bio - based composite and cellulose mixture also improve the flame retardancy of the debonding agent; fatty alcohol polyoxyethylene ether - 9 and N - octylpyrrolidone are two surfactants, both of which can reduce the surface tension of the debonding agent. As a result, the debonding agent has good wetting ability and permeability, and the intermolecular force between the debonding agent and the adhesive molecules is also enhanced, improving the debonding rate; xylene and ethanol in the solvent are organic solvents with good volatility and solubility. Using the principle of similar - phase solubility in the debonding agent, the solubility of substances such as polyacrylic acid is improved, and they also have good compatibility with it and are easy to remove;

[0118] In Comparative Example 1, since polyacrylic acid was not added during the preparation of the peptizing agent for new energy batteries, it can be seen from Table 1 that its peptizing rate is slower. This may be because the carboxyl groups in the polyacrylic acid molecules interact with the charges on the surface of the colloidal particles, which can weaken the interaction force between the colloidal particles. At the same time, the spatial structure of the polyacrylic acid molecular chain enables it to form a network structure between the colloidal particles, promoting the aggregation of the colloidal particles and reducing the viscosity of the adhesive. Moreover, polyacrylic acid can act as a dispersant, promoting the uniformity of the antioxidant in the peptizing agent and increasing the contact rate between the antioxidant and free radicals, thereby effectively enhancing the overall antioxidant capacity of the peptizing agent. The stability between the peptizing agent molecules is better, and it can play a better peptizing role. Therefore, the peptizing rate shown in Comparative Example 1 is slower than that in Example 1. In Comparative Example 2, since the bio-based composite was not added during the preparation of the peptizing agent for new energy batteries, it can be seen from Table 1 that its peptizing rate is slower. This may be because the modified chitin undergoes two acetylation reactions and has amphiphilicity, thus enabling good compatibility between the bio-based composite molecules. Moreover, starch, lignin, and polylactic acid are biological macromolecules containing many active groups, which can break the chemical bonds in the adhesive molecules, reducing the bonding performance. These active groups can form hydrogen bonds and van der Waals forces with the cellulose mixture and polyacrylic acid, enhancing the interaction force between substances and improving the structural stability of the peptizing agent to prevent rupture or leakage during the peptizing process. These active groups may also form chemical bonds with the battery materials, enhancing the discharge performance of the battery. Therefore, the peptizing rate shown in Comparative Example 2 is slower than that in Example 1. In Comparative Example 3, since the cellulose mixture was not added during the preparation of the peptizing agent for new energy batteries, it can be seen from Table 1 that its peptizing rate is slower. This may be because the cellulose mixture contains ethyl cellulose, carboxymethyl cellulose, and hydroxyethyl cellulose, and the groups contained therein can also react chemically with the adhesive molecules, breaking the chemical bonds in the adhesive molecules and reducing the bonding performance. It forms hydrogen bonds and van der Waals forces with the bio-based composite, enhancing the interaction force between substances and improving the structural stability of the peptizing agent. Therefore, the peptizing rate shown in Comparative Example 3 is slower than that in Example 1. In Comparative Example 4, since "N-octylpyrrolidone" was replaced with "an equal amount of fatty alcohol polyoxyethylene ether-9", it can be seen from Table 1 that its peptizing rate is slower. This may be because the surfactant N-octylpyrrolidone is a solvent-based surfactant, which not only has the ability to swell the peptizing agent but also has the ability of rapid wetting possessed by surfactants, causing the adhesive to swell rapidly and accelerating the peptizing rate of the peptizing agent. Therefore, the peptizing rate shown in Comparative Example 4 is slower than that in Example 1.In Comparative Example 5, since "fatty alcohol polyoxyethylene ether-9" was replaced with "an equal amount of N-octylpyrrolidone", it can be seen from Table 1 that its debinding rate is slower. This may be because the surfactant B, fatty alcohol polyoxyethylene ether-9, has both a certain cleaning effect and an excellent wetting speed. While increasing the wetting speed and debinding rate of the solution, it can also strip and suspend a certain amount of silicon powder on the surface of the silicon wafer during degumming. Therefore, the debinding rate shown in Comparative Example 5 is slower than that in Example 1.;

[0119] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present invention is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, and they are not provided in detail for the sake of brevity.

[0120] The present invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A peptizing agent for a new energy battery, characterized in that Made from the following raw materials in parts by mass: 1 - 3 parts of bio - based composite, 0.5 - 2 parts of cellulose mixture, 0.3 - 1.0 part of polyacrylic acid, 5 - 8 parts of surfactant A, 7 - 12 parts of surfactant B, 1 - 2 parts of antioxidant, 78 - 86 parts of solvent; The bio - based composite is obtained by mixing polylactic acid, starch, lignin, modified chitin and deionized water in a mass ratio of 2 - 3:3 - 6:2 - 3:5 - 8:2 - 5; The cellulose mixture is obtained by mixing ethyl cellulose, carboxymethyl cellulose and hydroxyethyl cellulose in a mass ratio of 4 - 8:2 - 6:2 - 6; The surfactant A is any one of N - octylpyrrolidone, diester phosphate, lauryl alcohol ether phosphate; The surfactant B is any one of non - ionic alcohol ethoxylate, polyethyleneimine alkoxylate compound, sodium perfluorononeneoxybenzenesulfonate; The preparation method of the modified chitin includes the following steps: Step A1. Add hydrochloric acid to N,N - dimethylformamide, add chitin to a flask containing hydrochloric acid - acidified N,N - dimethylformamide solution, mix evenly, then add phthalic anhydride, heat and stir to obtain mixture A; Step A2. Add sodium hydroxide to mixture A, stir evenly, then add phenol anhydride, heat and stir to obtain mixture B; Step A3. Add sodium bicarbonate to mixture B, filter to obtain a gel, wash it twice with deionized water, grind it and freeze - dry it at - 10°C for 4 - 4.5 h to obtain modified chitin.

2. The peptizing agent for new energy batteries according to claim 1, wherein, In step A1, the mass ratio of N,N - dimethylformamide, hydrochloric acid, chitin and phthalic anhydride is 5 - 7:5 - 7:4 - 8:12 - 15; The temperature during heating and stirring is 55 - 60°C, and the stirring time is 2 - 2.5 h.

3. The peptizing agent for new energy batteries according to claim 1, wherein In step A2, the mass ratio of mixture A, sodium hydroxide and phenol anhydride is 4 - 7:2 - 3:16 - 20; The temperature during heating and stirring is 55 - 60°C, and the stirring time is 2.5 - 3 h; In step A3, the mass ratio of mixture B and sodium bicarbonate is 5 - 8:7 - 10.

4. The peptizing agent for new energy batteries according to claim 1, wherein The preparation method of the bio - based composite includes the following steps: Ultrasonically treat polylactic acid, starch, lignin, modified chitin and deionized water for 10 - 15 min, and mix evenly to obtain a bio - based composite.

5. The peptizing agent for new energy batteries according to claim 1, wherein, The molecular weight of the polyacrylic acid is 30000 - 50000 g / mol.

6. The peptizing agent for new energy batteries according to claim 1, wherein The solvent is obtained by mixing N,N - dimethylformamide, dimethyl sulfoxide, xylene and ethanol in a mass ratio of 5 - 8:5 - 8:20 - 30:10 - 12.

7. The peptizing agent for new energy batteries according to claim 1, wherein, The antioxidant is obtained by mixing dibutylhydroxytoluene and propyl gallate in a mass ratio of 3 - 7:10 - 15.

8. The peptizing agent for new energy batteries according to claim 1, wherein The preparation method of the cellulose mixture includes the following steps: Mix ethyl cellulose, carboxymethyl cellulose and hydroxyethyl cellulose evenly to obtain a cellulose mixture.

9. A preparation method of a peptizing agent for a new energy battery according to any one of claims 1-8, characterized in that, Including the following steps: Step S1. Add the bio-based composite into the reaction kettle containing the solvent, heat it to 50 - 60 °C, stir for 40 - 60 min under the condition that the stirring rate is 30 - 60 r / min, mix evenly, then add the cellulose mixture into the solution, and stir until it is completely dissolved to obtain mixture C; Step S2. Add polyacrylic acid into mixture C, continue to stir for 20 - 40 min, then add surfactant A, surfactant B and antioxidant, stir for 55 - 75 min, and cool to room temperature to obtain the peptizing agent for new energy batteries.