Interface stabilizing binder for silicon negative electrode and method for preparing the same

Abstract

This invention relates to the field of adhesive technology, specifically to an interface-stabilizing adhesive for silicon anodes and its preparation method. The adhesive comprises curcumin-modified silicon-containing waterborne polyurethane-acrylate, a terpolymer, and a multifunctional monomer, wherein the mass ratio of the curcumin-modified silicon-containing waterborne polyurethane-acrylate, the terpolymer, and the multifunctional monomer is 3-5:1-2:1-1.2. The curcumin-modified silicon-containing waterborne polyurethane-acrylate is synthesized using acrylate and γ-methacryloyloxypropyltrimethoxysilane as modifiers and curcumin as a chain extender via an interpenetrating polymer network method. Through chemical bonding such as grafting and crosslinking, and supramolecular interactions such as hydrogen bonding and coordination, an intelligent network integrating elastic buffering, rigid support, interface passivation, self-healing, and ion conduction is constructed. After cycling, the electrode thickness expansion rate is controlled to <40%, with no macroscopic cracks and high electrode peel strength retention.

Description

Technical Field

[0001] This invention relates to the field of adhesive technology, and more specifically, to an interface-stabilizing adhesive for silicon anodes and a method for preparing the same. Background Technology

[0002] Currently, various electrode materials have been studied to improve the energy density of lithium-ion batteries.4-6 Among these materials, silicon stands out due to its environmental friendliness, abundant natural reserves, and high energy density of 4200 mAh·g2. -1 Its high theoretical specific capacity makes it a promising anode material for next-generation lithium-ion batteries, compared to currently used graphite (372 mAh·g). -1 The cycle life of silicon anodes is more than 10 times higher. However, the cycle life of silicon anodes is limited by the huge volume changes during charge and discharge cycles, leading to repeated formation of SEI layers, electrode cracking, and continuous capacity decay.

[0003] Using high-performance binders is considered one of the most effective means to solve a series of problems caused by the volume expansion of silicon electrodes. Common binders, such as polyvinylidene fluoride (PVDF), carboxymethyl cellulose (CMC), sodium alginate (SA), and guar gum (GG), cannot effectively suppress the volume expansion of silicon-based electrodes during charging and discharging at high current rates due to their poor mechanical strength and inability to withstand high temperatures.

[0004] In existing technologies, silicon surfaces readily generate reactive oxygen species (ROS) during electrochemical processes, and the highly reactive silicon surface catalyzes the oxidative decomposition of electrolyte solvents (such as carbonates). This leads to a deterioration of the SEI composition and excessive instability due to excessive organic components. Summary of the Invention

[0005] This invention provides an interface-stabilizing binder for silicon anodes and its preparation method. Through chemical bonding such as grafting and crosslinking and supramolecular interactions such as hydrogen bonding and coordination, an intelligent network integrating elastic buffering, rigid support, interface passivation, self-repair, and ion conduction is constructed. After cycling, the electrode thickness expansion rate is controlled to < 40%, with no macroscopic cracks and high electrode peel strength retention.

[0006] In a first aspect, the present invention provides an interface-stabilizing binder for silicon anodes, comprising curcumin-modified silicon-containing waterborne polyurethane-acrylate, a terpolymer, a multifunctional monomer, and polyethylene glycol, wherein the mass ratio of the curcumin-modified silicon-containing waterborne polyurethane-acrylate, the terpolymer, and the multifunctional monomer is 3~5:1~2:1~1.2; and the amount of polyethylene glycol added is 5%~15%.

[0007] Preferably, the interface-stabilizing adhesive uses a silicone-containing waterborne polyurethane-acrylate as the matrix skeleton, curcumin as the functionalized modification, a ternary copolymer structure and multifunctional monomers as network reinforcement, and polyethylene glycol as the interface stabilizer.

[0008] Preferably, the curcumin-modified silicon-containing waterborne polyurethane-acrylate is synthesized using an interpenetrating polymer network method with acrylate and γ-methacryloyloxypropyltrimethoxysilane as modifiers and curcumin as chain extender.

[0009] Preferably, the mass ratio of the acrylate to γ-methacryloyloxypropyltrimethoxysilane is 2-3:1-2; and the amount of curcumin added is 2-8%.

[0010] Preferably, the terpolymer is a styrene-maleic anhydride-N-phenylmaleimide terpolymer.

[0011] Preferably, the mass ratio of styrene, maleic anhydride and N-phenylmaleimide is (35-50):(30-40):(8-20).

[0012] Preferably, the multifunctional monomer is selected from at least one of allyl glycidyl ether, ethylene glycol dimethacrylate, γ-methacryloyloxypropyltrimethoxysilane, glycidyl acrylate, and methacryloxychitosan.

[0013] Secondly, the present invention provides a method for preparing an interface-stabilizing binder for silicon anodes, comprising the following steps: (1) Preparation of curcumin-modified silicon-containing waterborne polyurethane-acrylate solution: graft curcumin-vinyl monomer onto the skeleton of silicon-containing polyurethane prepolymer, cool to 35~40℃, add triethylamine to neutralize, add deionized water for high-speed shear emulsification to form polyurethane emulsion, add acrylate monomer mixture, heat to 65~80℃, and carry out free radical emulsion polymerization for 4~8h to obtain curcumin-modified silicon-containing waterborne polyurethane-acrylate solution; (2) Preparation of terpolymer aqueous dispersion: Add acetone solvent to styrene, maleic anhydride and N-phenylmaleimide, add benzoyl peroxide initiator, reflux polymerization at 80~90℃ for 6~8h to obtain terpolymer solution, then add water and neutralizing agent ammonia water, adjust pH to 7~8, evaporate organic solvent to obtain terpolymer aqueous dispersion; (3) The terpolymer aqueous dispersion was slowly added dropwise to the curcumin-modified silicon-containing aqueous polyurethane-acrylate solution, the multifunctional monomer solution was added, and the polyethylene glycol aqueous solution was added. The mixture was stirred evenly to fully disperse the components and obtain the mixture. (4) Heat the mixed emulsion to 50~80℃, keep it at the temperature for 2~4h, cool it to room temperature, filter it, and obtain the interface stabilizing binder for silicon anode.

[0014] Preferably, the solid content of the curcumin-modified silicon-containing aqueous polyurethane-acrylate solution is 20%~40%.

[0015] Preferably, the solid content of the interface stabilizing binder used for the silicon anode is 5% to 12%.

[0016] Thirdly, the present invention provides an application of an interface-stabilizing binder used in a silicon anode.

[0017] In summary, the present invention has the following beneficial effects: 1. In this invention, curcumin-modified silicon-containing waterborne polyurethane-acrylate uses acrylate and γ-methacryloxypropyltrimethoxysilane as modifiers and curcumin as a chain extender, synthesized using an interpenetrating polymer network method. Curcumin molecules are introduced into the polymer backbone or side chains through chemical bonds. Unlike physically added antioxidants that are easily lost, chemical grafting ensures its long-term stable function throughout the entire battery life. Secondly, silicon-containing monomers are introduced, utilizing the extremely low rotational potential energy and large bond angle of the Si-O bond to endow the polymer with extremely high flexibility and resilience. During repeated expansion and contraction, the binder layer does not crack or pulverize, always tightly wrapping the silicon particles and maintaining the connectivity of the conductive network. This provides the silicon anode with an interfacial environment that can withstand large deformations, actively scavenge harmful free radicals, and firmly lock in the active material, further enabling long lifespan and high safety for the silicon anode.

[0018] 2. The terpolymer in this invention is a styrene-maleic anhydride-N-phenylmaleimide terpolymer. The N-phenylmaleimide monomer contains a rigid five-membered imide ring and a benzene ring, which greatly restricts the movement of polymer chain segments. Even at temperatures of 60°C or higher, the binder network remains robust, preventing electrode creep and porosity changes at high temperatures and ensuring the structural integrity of the battery under extreme conditions. The maleic anhydride unit readily hydrolyzes and opens its ring in an aqueous environment, generating a high density of carboxyl groups (-COOH). These carboxyl groups can form extremely strong hydrogen bonds with the hydroxyl groups (Si-OH) on the surface of silicon particles, and even form covalent ester bonds during the drying and curing process. The π-electron cloud of the benzene ring can also generate π-π stacking interactions with conductive agents (such as carbon nanotubes and graphene), further enhancing the bonding with the conductive network, significantly improving the peel strength of the electrode, and preventing the active material from detaching during cycling. When silicon expands, the flexible matrix absorbs strain, while the rigid terpolymer network provides a reaction force, limiting the expansion amplitude and preventing excessive particle aggregation. Utilizing the heat-resistant rigidity of maleimide and the strong polar anchoring of maleic anhydride, a robust framework with high temperature resistance, creep resistance, and strong bonding is constructed for the highly expandable silicon anode. This framework perfectly complements the flexible curcumin-modified silicon-containing waterborne polyurethane-acrylate, achieving long cycle life, high safety, and high rate performance for the silicon anode.

[0019] 3. The interface stabilizing binder for silicon anodes prepared in this invention constructs an intelligent network integrating elastic buffering, rigid support, interface passivation, self-repair, and ion conduction through chemical bonding such as grafting and cross-linking and supramolecular interactions such as hydrogen bonding and coordination; after cycling, the electrode thickness expansion rate is controlled at < 40%, and there are no macroscopic cracks, and the electrode peel strength retention rate is high.

[0020] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the scope of protection of the present invention. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the embodiments. It should be noted that: unless otherwise specified, the conditions in the following embodiments are carried out according to conventional conditions or the conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following embodiments can be obtained from commercially available sources.

[0022] Example Example 1 A method for preparing an interface-stabilizing binder for silicon anodes includes the following steps: (1) Preparation of curcumin-modified silicon-containing waterborne polyurethane-acrylate solution: curcumin-vinyl monomer was grafted onto the skeleton of silicon-containing polyurethane prepolymer, cooled to 35°C, triethylamine was added for neutralization, deionized water was added for high-speed shear emulsification to form a polyurethane emulsion, acrylate monomer mixture was added, the temperature was raised to 65°C, and free radical emulsion polymerization was carried out for 4 hours to obtain curcumin-modified silicon-containing waterborne polyurethane-acrylate solution; (2) Preparation of terpolymer aqueous dispersion: acetone solvent was added to styrene, maleic anhydride and N-phenylmaleimide, and benzoyl peroxide initiator was added. The mixture was refluxed at 80°C for 6 h to obtain terpolymer solution. Water and neutralizing agent ammonia were added to adjust the pH to 7. The organic solvent was evaporated to obtain terpolymer aqueous dispersion. (3) The terpolymer aqueous dispersion was slowly added dropwise to the curcumin-modified silicon-containing aqueous polyurethane-acrylate solution, the multifunctional monomer solution was added, and the polyethylene glycol aqueous solution was added. The mixture was stirred evenly to fully disperse the components and obtain the mixture. (4) The mixed emulsion was heated to 50°C, kept at the temperature for 2 hours, cooled to room temperature, filtered, and the interface stabilizer binder for silicon anode was obtained.

[0023] The mass ratio of curcumin-modified silicone-containing waterborne polyurethane-acrylate, terpolymer, and multifunctional monomer is 3:1:1; the mass ratio of acrylate to γ-methacryloyloxypropyltrimethoxysilane is 2:1; and the amount of curcumin added is 8%. The solid content of the curcumin-modified silicone-containing waterborne polyurethane-acrylate solution is 20%.

[0024] The amount of polyethylene glycol added is 5%.

[0025] The mass ratio of styrene, maleic anhydride, and N-phenylmaleimide is 35:30:8; the multifunctional monomer is selected from allyl glycidyl ether.

[0026] The solid content of the interface stabilizing binder used for silicon anodes is 5%.

[0027] Example 2 A method for preparing an interface-stabilizing binder for silicon anodes includes the following steps: (1) Preparation of curcumin-modified silicon-containing waterborne polyurethane-acrylate solution: curcumin-vinyl monomer was grafted onto the skeleton of silicon-containing polyurethane prepolymer, cooled to 40°C, triethylamine was added for neutralization, deionized water was added for high-speed shear emulsification to form a polyurethane emulsion, acrylate monomer mixture was added, the temperature was raised to 75°C, and free radical emulsion polymerization was carried out for 5 h to obtain curcumin-modified silicon-containing waterborne polyurethane-acrylate solution; (2) Preparation of terpolymer aqueous dispersion: acetone solvent was added to styrene, maleic anhydride and N-phenylmaleimide, and benzoyl peroxide initiator was added. The mixture was refluxed at 80°C for 6 h to obtain terpolymer solution. Water and neutralizing agent ammonia were added to adjust the pH to 7. The organic solvent was evaporated to obtain terpolymer aqueous dispersion. (3) The terpolymer aqueous dispersion was slowly added dropwise to the curcumin-modified silicon-containing aqueous polyurethane-acrylate solution, the multifunctional monomer solution was added, and the polyethylene glycol aqueous solution was added. The mixture was stirred evenly to fully disperse the components and obtain the mixture. (4) The mixed emulsion was heated to 55°C, kept at the temperature for 2 hours, cooled to room temperature, filtered, and the interface stabilizer binder for silicon anode was obtained.

[0028] The mass ratio of curcumin-modified silicone-containing waterborne polyurethane-acrylate, terpolymer, and multifunctional monomer is 4:1:1; the mass ratio of acrylate to γ-methacryloyloxypropyltrimethoxysilane is 3:1; and the amount of curcumin added is 4%. The solid content of the curcumin-modified silicone-containing waterborne polyurethane-acrylate solution is 24%.

[0029] The amount of polyethylene glycol added is 8%.

[0030] The mass ratio of styrene, maleic anhydride, and N-phenylmaleimide is 40:30:8; the multifunctional monomer is selected from allyl glycidyl ether.

[0031] The solid content of the interface stabilizing binder used for silicon anodes is 7%.

[0032] Example 3 A method for preparing an interface-stabilizing binder for silicon anodes includes the following steps: (1) Preparation of curcumin-modified silicon-containing waterborne polyurethane-acrylate solution: curcumin-vinyl monomer was grafted onto the skeleton of silicon-containing polyurethane prepolymer, cooled to 40°C, triethylamine was added for neutralization, deionized water was added for high-speed shear emulsification to form a polyurethane emulsion, acrylate monomer mixture was added, the temperature was raised to 80°C, and free radical emulsion polymerization was carried out for 8 hours to obtain curcumin-modified silicon-containing waterborne polyurethane-acrylate solution; (2) Preparation of terpolymer aqueous dispersion: acetone solvent was added to styrene, maleic anhydride and N-phenylmaleimide, and benzoyl peroxide initiator was added. The mixture was refluxed at 90°C for 8 hours to obtain terpolymer solution. Water and neutralizing agent ammonia were added to adjust the pH to 8. The organic solvent was evaporated to obtain terpolymer aqueous dispersion. (3) The terpolymer aqueous dispersion was slowly added dropwise to the curcumin-modified silicon-containing aqueous polyurethane-acrylate solution, the multifunctional monomer solution was added, and the polyethylene glycol aqueous solution was added. The mixture was stirred evenly to fully disperse the components and obtain the mixture. (4) The mixed emulsion was heated to 80°C, kept at the temperature for 2 hours, cooled to room temperature, filtered, and the interface stabilizer binder for silicon anode was obtained.

[0033] The mass ratio of curcumin-modified silicone-containing waterborne polyurethane-acrylate, terpolymer, and multifunctional monomer is 3:2:1.1; the mass ratio of acrylate and γ-methacryloyloxypropyltrimethoxysilane is 2~3:1~2; and the amount of curcumin added is 3%. The solid content of the curcumin-modified silicone-containing waterborne polyurethane-acrylate solution is 30%.

[0034] The amount of polyethylene glycol added is 9%.

[0035] The mass ratio of styrene, maleic anhydride, and N-phenylmaleimide is 42:33:10; the multifunctional monomer is selected from allyl glycidyl ether.

[0036] The solid content of the interface stabilizing binder used for silicon anodes is 6%.

[0037] Example 4 A method for preparing an interface-stabilizing binder for silicon anodes includes the following steps: (1) Preparation of curcumin-modified silicon-containing waterborne polyurethane-acrylate solution: curcumin-vinyl monomer was grafted onto the skeleton of silicon-containing polyurethane prepolymer, cooled to 40°C, triethylamine was added for neutralization, deionized water was added for high-speed shear emulsification to form a polyurethane emulsion, acrylate monomer mixture was added, the temperature was raised to 80°C, and free radical emulsion polymerization was carried out for 8 hours to obtain curcumin-modified silicon-containing waterborne polyurethane-acrylate solution; (2) Preparation of terpolymer aqueous dispersion: acetone solvent was added to styrene, maleic anhydride and N-phenylmaleimide, and benzoyl peroxide initiator was added. The mixture was refluxed at 90°C for 8 hours to obtain terpolymer solution. Water and neutralizing agent ammonia were added to adjust the pH to 8. The organic solvent was evaporated to obtain terpolymer aqueous dispersion. (3) The terpolymer aqueous dispersion was slowly added dropwise to the curcumin-modified silicon-containing aqueous polyurethane-acrylate solution, the multifunctional monomer solution was added, and the polyethylene glycol aqueous solution was added. The mixture was stirred evenly to fully disperse the components and obtain the mixture. (4) The mixed emulsion was heated to 80°C, kept at the temperature for 4 hours, cooled to room temperature, filtered, and the interface stabilizer binder for silicon anode was obtained.

[0038] The mass ratio of curcumin-modified silicone-containing waterborne polyurethane-acrylate, terpolymer, and multifunctional monomer is 5:1:1.2; the mass ratio of acrylate to γ-methacryloyloxypropyltrimethoxysilane is 2:1; and the amount of curcumin added is 7%. The solid content of the curcumin-modified silicone-containing waterborne polyurethane-acrylate solution is 38%.

[0039] The amount of polyethylene glycol added is 12%.

[0040] The mass ratio of styrene, maleic anhydride, and N-phenylmaleimide is 46:37:15; the multifunctional monomer is selected from allyl glycidyl ether.

[0041] The solid content of the interface stabilizing binder used for silicon anodes is 11%.

[0042] Example 5 A method for preparing an interface-stabilizing binder for silicon anodes includes the following steps: (1) Preparation of curcumin-modified silicon-containing waterborne polyurethane-acrylate solution: curcumin-vinyl monomer was grafted onto the skeleton of silicon-containing polyurethane prepolymer, cooled to 40°C, triethylamine was added for neutralization, deionized water was added for high-speed shear emulsification to form a polyurethane emulsion, acrylate monomer mixture was added, the temperature was raised to 80°C, and free radical emulsion polymerization was carried out for 8 hours to obtain curcumin-modified silicon-containing waterborne polyurethane-acrylate solution; (2) Preparation of terpolymer aqueous dispersion: acetone solvent was added to styrene, maleic anhydride and N-phenylmaleimide, and benzoyl peroxide initiator was added. The mixture was refluxed at 90°C for 8 hours to obtain terpolymer solution. Water and neutralizing agent ammonia were added to adjust the pH to 8. The organic solvent was evaporated to obtain terpolymer aqueous dispersion. (3) The terpolymer aqueous dispersion was slowly added dropwise to the curcumin-modified silicon-containing aqueous polyurethane-acrylate solution, the multifunctional monomer solution was added, and the polyethylene glycol aqueous solution was added. The mixture was stirred evenly to fully disperse the components and obtain the mixture. (4) The mixed emulsion was heated to 80°C, kept at the temperature for 4 hours, cooled to room temperature, filtered, and the interface stabilizer binder for silicon anode was obtained.

[0043] The mass ratio of curcumin-modified silicone-containing waterborne polyurethane-acrylate, terpolymer, and multifunctional monomer is 5:2:1.2; the mass ratio of acrylate and γ-methacryloyloxypropyltrimethoxysilane is 3:2; and the amount of curcumin added is 8%. The solid content of the curcumin-modified silicone-containing waterborne polyurethane-acrylate solution is 40%.

[0044] The amount of polyethylene glycol added is 15%.

[0045] The mass ratio of styrene, maleic anhydride, and N-phenylmaleimide is 50:40:20; the multifunctional monomer is selected from allyl glycidyl ether.

[0046] The solid content of the interface stabilizing binder used for silicon anodes is 12%.

[0047] Comparative Example 1 The difference from Example 1 is that curcumin-modified silicone-containing aqueous polyurethane-acrylate solution was not added.

[0048] Comparative Example 2 The difference from Example 1 is that the curcumin-modified silicone-containing waterborne polyurethane-acrylate solution is replaced with a silicone-containing waterborne polyurethane-acrylate solution.

[0049] Comparative Example 3 The difference from Example 1 is that no terpolymer was added.

[0050] Comparative Example 4 The difference from Example 1 is that polyethylene glycol was not added.

[0051] Performance testing: 80 mg of silicon active material (nano silicon powder) and 20 mg of conductive agent (acetylene black) were placed in a mortar and ground thoroughly for 20 min. Then, 150 mg of the interface stabilizing binder prepared in Examples 1-5 and Comparative Examples 1-4 were added, and the mixture was ground thoroughly until it was mixed evenly to obtain a paste with suitable viscosity. The electrode paste was evenly coated on copper foil using an infrared drying plate coating machine. After air drying at room temperature for 24 h, it was vacuum dried at 60 °C for 10 h. After drying, the electrode sheet was rolled by a roller press and cut into pieces by a slicer to obtain a circular electrode sheet with a radius of 8 mm. The sheet was then dried under vacuum at 110 °C for 12 h to obtain the silicon negative electrode sheet.

[0052] The silicon anode sheet and lithium sheet prepared above were used as the anode and cathode of the lithium-ion battery, respectively. Celgard 2400 single-layer polypropylene membrane was used as the separator, and a mixed solution of 1 mol / L LiPF6 ethylene carbonate (EC) and diethyl carbonate (EMC) (v / v=1:1) was used as the electrolyte solution. The lithium-ion battery was assembled into a CR2032 button cell in an argon-filled glove box.

[0053] Peel strength: The electrode sheet was subjected to a 180° peel test using an electronic universal testing machine (DL-D type) to test the adhesion strength of the electrode sheet; Electrolyte swelling resistance: The swelling rate was tested after immersion in EC / DMC and LiPF6 for 7 days.

[0054] Electrochemical performance: The above lithium-ion battery was subjected to constant current charge-discharge test at room temperature. Specifically, the coin cell was charged and discharged within a voltage range of (3-0.01)V at a constant current of 0.5C. The initial coulombic efficiency and capacity retention after 1000 cycles were tested.

[0055] Table 1 Performance Test Results

[0056] The above description is merely an exemplary embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An interface-stabilizing binder for silicon anodes, characterized in that, The product comprises curcumin-modified silicone-containing waterborne polyurethane-acrylate, a terpolymer, a multifunctional monomer, and polyethylene glycol, wherein the mass ratio of the curcumin-modified silicone-containing waterborne polyurethane-acrylate, the terpolymer, and the multifunctional monomer is 3~5:1~2:1~1.2; and the amount of polyethylene glycol added is 5%~15%.

2. The interface-stabilizing binder for silicon anodes according to claim 1, characterized in that, The interface-stabilizing adhesive uses silicone-containing waterborne polyurethane-acrylate as the matrix framework, curcumin as the functionalized modification, a ternary copolymer structure and multifunctional monomers as network reinforcement, and polyethylene glycol as the interface stabilizer.

3. The interface-stabilizing binder for silicon anodes according to claim 2, characterized in that, The curcumin-modified silicon-containing waterborne polyurethane-acrylate is synthesized using acrylate and γ-methacryloyloxypropyltrimethoxysilane as modifiers and curcumin as chain extender via an interpenetrating polymer network method.

4. The interface-stabilizing binder for silicon anodes according to claim 3, characterized in that, The mass ratio of the acrylate to γ-methacryloyloxypropyltrimethoxysilane is 2~3:1~2; the amount of curcumin added is 2~8%.

5. The interface-stabilizing binder for silicon anodes according to claim 1, characterized in that, The terpolymer is a styrene-maleic anhydride-N-phenylmaleimide terpolymer.

6. The interface-stabilizing binder for silicon anodes according to claim 5, characterized in that, The mass ratio of styrene, maleic anhydride, and N-phenylmaleimide is (35) 50):(30 40):(8 20).

7. The interface-stabilizing binder for silicon anodes according to claim 1, characterized in that, The multifunctional monomer is selected from at least one of allyl glycidyl ether, ethylene glycol dimethacrylate, γ-methacryloyloxypropyltrimethoxysilane, glycidyl acrylate, and methacrylated chitosan.

8. The method for preparing the interface-stabilizing binder for silicon anodes according to any one of claims 1 to 7, characterized in that, Includes the following steps: (1) Preparation of curcumin-modified silicon-containing waterborne polyurethane-acrylate solution: graft curcumin-vinyl monomer onto the skeleton of silicon-containing polyurethane prepolymer, cool to 35~40℃, add triethylamine to neutralize, add deionized water for high-speed shear emulsification to form polyurethane emulsion, add acrylate monomer mixture, heat to 65~80℃, and carry out free radical emulsion polymerization for 4~8h to obtain curcumin-modified silicon-containing waterborne polyurethane-acrylate solution; (2) Preparation of terpolymer aqueous dispersion: Add acetone solvent to styrene, maleic anhydride and N-phenylmaleimide, add benzoyl peroxide initiator, reflux polymerization at 80~90℃ for 6~8h to obtain terpolymer solution, then add water and neutralizing agent ammonia water, adjust pH to 7~8, evaporate organic solvent to obtain terpolymer aqueous dispersion; (3) The terpolymer aqueous dispersion was slowly added dropwise to the curcumin-modified silicon-containing aqueous polyurethane-acrylate solution, the multifunctional monomer solution was added, and the polyethylene glycol aqueous solution was added. The mixture was stirred evenly to fully disperse the components and obtain the mixture. (4) Heat the mixed emulsion to 50~80℃, keep it at the temperature for 2~4h, cool it to room temperature, filter it, and obtain the interface stabilizing binder for silicon anode.

9. The method for preparing the interface-stabilizing binder for silicon anodes according to claim 8, characterized in that, The solid content of the curcumin-modified silicon-containing aqueous polyurethane-acrylate solution is 20%~40%; the solid content of the interface stabilizing binder used for silicon anode is 5%~12%.

10. The application of the interface-stabilizing binder for silicon anodes according to any one of claims 1 to 7, or the interface-stabilizing binder for silicon anodes prepared by the preparation method of the interface-stabilizing binder for silicon anodes according to any one of claims 8 to 9, characterized in that, The interface-stabilizing binder is used in silicon anodes.

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