Ultraviolet light-curable silicon-carbon negative electrode material and preparation method and application thereof

Abstract

The application discloses an ultraviolet light curing type silicon-carbon negative electrode material and a preparation method and application thereof, and belongs to the technical field of battery materials, wherein the ultraviolet light curing type silicon-carbon negative electrode material comprises a polymer monomer, a photoinitiator, a crosslinking agent, silicon-carbon powder, a porous material and a solvent; and the polymer monomer is butyl acrylate. By selecting butyl acryate with elasticity as the polymer monomer, the irregularly shaped silicon-carbon particles can be encapsulated in the electrode structure, the volume expansion of the silicon element caused by heating in the electrode preparation process can be effectively buffered, the structural stability of the overall material is improved, the inter-particle contact and the transmission of mechanical stress are prevented, the pressure caused by the volume expansion is buffered, and the structural integrity and uniformity are maintained. Compared with a silicon-carbon negative electrode prepared by using a traditional binder, a lithium ion battery prepared by using the ultraviolet light curing type silicon-carbon negative electrode material has a higher first circle coulomb efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery materials, and particularly relates to an ultraviolet light curing type silicon-carbon negative electrode material and a preparation method and application thereof. BACKGROUND

[0002] The negative electrode material of a lithium ion battery mainly includes carbon materials and non-carbon materials, and the commercialized lithium ion battery mainly uses graphite as the negative electrode material, and the theoretical specific capacity of the graphite is 372 mAh / g. In the non-carbon materials, the silicon-based negative electrode material is concerned due to the high theoretical specific capacity (4200 mAh / g), and with the progress of science and technology, the silicon-carbon negative electrode material is gradually developed.

[0003] However, in the actual application process, it is found that although the silicon-carbon negative electrode material has obvious advantages in specific capacity, it has poor compatibility with conventional binders, resulting in poor adhesion of the coated silicon-carbon negative electrode material to the current collector, and the coating is easy to fall off and crack. In the prior art, although the synergistic effect of some curing agents, binders and dispersants such as sodium alginate, polyacrylic acid (PAA), sodium carboxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR) can cross-link the entire negative electrode material together, this method can strengthen the electrolyte infiltration of the negative electrode sheet (the negative electrode carbon material often has poor electrolyte infiltration), but it also affects the migration speed of lithium ions in the main solvent of the electrolyte, increases the battery impedance, and although the temperature can promote the cross-linking speed of PAA, CMC and SBR with silicon-carbon particles, the cross-linking is often not completed during formation, and it needs to be cycled several times, which will cause water to continue to be generated during the later cross-linking process, and then a side reaction with the electrolyte, affecting the battery cycle. And PAA, PAA-Li and other materials have high rigidity, which can effectively inhibit the volume expansion of silicon in the silicon-carbon negative electrode material to a certain extent, but self-polymerization reaction is easy to occur during homogenization or drying. This self-polymerization reaction will generate polymers with higher molecular weight, making the electrode sheet exhibit high brittleness in macroscopic view. This brittleness makes the electrode sheet prone to cracking or falling off during the processing or battery manufacturing process due to external force. These phenomena not only affect the production efficiency of the battery, but more importantly, they will reduce the capacity and cycle life of the battery.

[0004] In addition, the existing electrode sheet preparation process has many steps and complex condition control, which is easy to cause inconsistency of material performance, thereby affecting the stability and overall electrochemical performance of the battery, and may increase the production cost and difficulty, limiting its industrial application. Therefore, the preparation process of the existing silicon-carbon negative electrode material still needs to be improved. SUMMARY

[0005] The present application aims to provide an ultraviolet light-cured silicon-carbon negative electrode material to solve the problems in the background art.

[0006] To achieve the above object, the embodiments of the present application provide the following technical solutions.

[0007] An ultraviolet light-cured silicon-carbon negative electrode material comprises the following components in parts by weight: 3-7 parts of a polymer monomer, 0.16-0.37 parts of a photoinitiator, 0.52-1.21 parts of a crosslinking agent, 30-70 parts of silicon-carbon powder, 0.1-5 parts of a porous material, and 30-70 parts of a solvent; the polymer monomer is butyl acrylate; and the porous material is a porous hydrogen-bonded organic framework material.

[0008] Preferably, the photoinitiator is diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide.

[0009] Preferably, the crosslinking agent is polyethylene glycol diacrylate.

[0010] Preferably, the solvent is N,N-dimethylformamide.

[0011] Preferably, the preparation method of the porous material comprises the following steps.

[0012] 3,4,9,10-perylenetetracarboxylic dianhydride and dicyandiamide are mixed and added to N,N-dimethylformamide and ethylene glycol to obtain a reaction solution;

[0013] The reaction solution is subjected to a heating reaction, the obtained product is filtered, and washing and drying treatment is performed to obtain the porous material.

[0014] Preferably, the mass ratio of 3,4,9,10-perylenetetracarboxylic dianhydride to dicyandiamide is 1:(1.5-2.5).

[0015] Preferably, the temperature of the heating reaction is 180-220℃.

[0016] Another object of the present application is to provide a preparation method of the ultraviolet light-cured silicon-carbon negative electrode material, which comprises the following steps.

[0017] The polymer monomer is mixed with the solvent;

[0018] The photoinitiator is added dropwise while stirring;

[0019] The silicon-carbon powder is added while stirring;

[0020] The porous material is added while stirring;

[0021] The crosslinking agent is added dropwise while stirring to obtain the ultraviolet light-cured silicon-carbon negative electrode material.

[0022] Another object of the present application is to provide an application of the above-mentioned ultraviolet-curable silicon-carbon negative electrode material in the preparation of a lithium ion battery.

[0023] Preferably, the lithium ion battery comprises a positive electrode and a negative electrode, and the preparation method of the negative electrode comprises the following steps:

[0024] The ultraviolet-curable silicon-carbon negative electrode material is subjected to vacuum defoaming treatment and then coated on a current collector;

[0025] The current collector coated with the ultraviolet-curable silicon-carbon negative electrode material is subjected to ultraviolet curing and gradient drying to obtain a negative electrode.

[0026] The ultraviolet-curable silicon-carbon negative electrode material provided by the present application can encapsulate irregularly-shaped silicon-carbon particles in an electrode structure by selecting butyl acrylate with elasticity as a polymer monomer, effectively buffering the volume expansion of silicon elements due to heating during electrode preparation, thereby improving the structural stability of the overall material, preventing the transmission of inter-particle contact and mechanical stress, facilitating the buffering of pressure caused by volume expansion, and maintaining the integrity and uniformity of the structure. Compared with a silicon-carbon negative electrode prepared using a traditional binder, a lithium ion battery made of the ultraviolet-curable silicon-carbon negative electrode material provided by the present application has a higher first-cycle coulomb efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A flowchart of the preparation method of the ultraviolet-curable silicon-carbon negative electrode material and negative electrode provided by the present application embodiment.

[0028] Figure 2 A scanning electron microscope photo of the ultraviolet-curable silicon-carbon negative electrode prepared for Example 1.

[0029] Figure 3 A first charge-discharge curve graph of the lithium ion battery made of the ultraviolet-curable silicon-carbon negative electrode of Example 2 and the binder-type silicon-carbon negative electrode of Comparative Example 1. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] As shown in Figure 1 In one embodiment of the present application, an ultraviolet-curable silicon-carbon negative electrode material and a preparation method of a negative electrode are provided, which comprise the following steps:

[0032] S1, 3-7 parts of polymer monomer is mixed with 30-70 parts of solvent by weight;

[0033] S2, 0.16-0.37 parts of photoinitiator is added dropwise while stirring;

[0034] S3, 30-70 parts of silicon-carbon powder is added while stirring;

[0035] S4, 0.1-5 parts of porous material is added while stirring;

[0036] S5, 0.52-1.21 parts of crosslinking agent is added dropwise while stirring to obtain an ultraviolet light-cured silicon-carbon negative electrode material;

[0037] S6, the ultraviolet light-cured silicon-carbon negative electrode material is subjected to vacuum defoaming treatment, and then coated on a current collector;

[0038] S7, the current collector coated with the ultraviolet light-cured silicon-carbon negative electrode material is subjected to ultraviolet light curing;

[0039] S8, after ultraviolet light curing, gradient drying is performed, and a negative electrode for lithium ion batteries is obtained.

[0040] The polymer monomer is selected from butyl acrylate; butyl acrylate belongs to the artificial rubber elastomer, is cheap, and has excellent elasticity and thermal stability;

[0041] The photoinitiator is selected from diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide, but is not limited to this; diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide is a commonly used ultraviolet light curing agent, and is more convenient for controlling the polymerization reaction;

[0042] The crosslinking agent is selected from polyethylene glycol diacrylate with a molecular weight of 575, but is not limited to this; polyethylene glycol diacrylate is used for better crosslinking of the polymer monomer;

[0043] The solvent is selected from N,N-dimethylformamide, but is not limited to this, and other solvents that can uniformly disperse the above-mentioned raw materials can also be used; wherein, N,N-dimethylformamide is commonly used as a solvent for lithium ion batteries, which helps to improve the migration rate of lithium ions;

[0044] The silicon-carbon powder can be selected from the product of C ONE-SC 1800 sold by Carbon New Energy Group Co., Ltd., but is not limited to this, and other commercially available silicon-carbon sources can also be used;

[0045] The porous material is selected from a porous hydrogen-bonded organic framework material. Specifically, the preparation method of the porous material comprises the following steps: 3,4,9,10-perylenetetracarboxylic dianhydride and dicyanediamine are mixed and added into N,N-dimethylformamide and ethylene glycol to obtain a reaction solution; the reaction solution is heated to 180-220 DEG C for reaction, the obtained product is filtered, and washing and drying treatment are performed to obtain the porous material. The mass ratio of 3,4,9,10-perylenetetracarboxylic dianhydride and dicyanediamine is 1:(1.5-2.5).

[0046] The current collector is selected from a copper foil, but is not limited thereto.

[0047] It should be noted that the irradiation wavelength used for ultraviolet light curing can be selected as the wavelength effectively absorbed by the photoinitiator, for example, 350-400 nm in the UV-A region. The time for ultraviolet light curing varies from a few minutes to a few hours, depending on the thickness of the polymerization layer and the polymerization rate. The drying temperature varies from 60 DEG C to 100 DEG C, depending on the volatility of the solvent and the thermal stability of the polymer; the drying time varies from a few hours to a few dozen hours, depending on the thickness of the polymerization layer and the solvent content.

[0048] In the embodiment of the present application, the prepared ultraviolet light curing type silicon-carbon negative electrode material has excellent tensile and compressive elasticity, can penetrate and occupy the internal voids of the porous electrode, and encapsulates the irregularly shaped silicon-carbon particles in the electrode structure. In addition, through ultraviolet light curing, the material can coat the silicon-carbon particles and adhere closely to the surface of the current collector. As the electrode reaction proceeds, due to the excellent elasticity of the material, the stress generated by the expansion of the silicon particles can be dissipated, and the integrity of the electrode structure is maintained, thereby realizing more stable cycling of the lithium ion battery and being conducive to the large-scale development of the lithium ion battery. The above-mentioned scheme can solve the problems of poor adhesion of the silicon-carbon negative electrode material to the current collector and easy peeling and cracking of the coating in the prior art; and solve the problems of more process steps and complex condition control in the prior art.

[0049] The following examples are some specific implementation cases of the present application in actual application, but are not limited thereto.

[0050] Embodiment 1: The embodiment provides a preparation method of an ultraviolet light curing type silicon-carbon negative electrode, which comprises the following steps:

[0051] S1, 0.05g of butyl acrylate and 0.5g of N,N-dimethylformamide are weighed into a 5mL glass vial with a stir bar, mixed uniformly to obtain a polymer monomer solution;

[0052] S2, 0.0026g of diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide is added to the above polymer monomer solution while stirring, stirred for 10min to make the solid completely dissolved, the solution remains clear and transparent, to obtain a mixed solution;

[0053] S3, 500 mg of silicon-carbon powder was weighed out and ground in a quartz mortar for 30 min, and then added to the mixed solution while stirring with a medicine spoon, and stirring was continued for 1 h; wherein the silicon-carbon powder was a product of the type C ONE-SC 1800 commercially available from the Carbon-one New Energy Group Co., Ltd.;

[0054] S4, 10 mg of porous hydrogen-bonded organic framework material was weighed out and ground in a quartz mortar for 20 min, and then added to the mixed solution while stirring with a medicine spoon, and stirring was continued for 1 h; wherein the porous hydrogen-bonded organic framework material was prepared by the following steps: 2 g of 3,4,9,10-perylenetetracarboxylic dianhydride and 4.05 g of dicyanediamine were mixed and added to a mixed solvent of 20 mL of N,N-dimethylformamide and 20 mL of ethylene glycol to obtain a reaction solution; the reaction solution was magnetically stirred at room temperature for 4 h, and then transferred to a reactor, sealed and heated in a muffle furnace at 200°C for 60 h; after the reactor was cooled, the product was filtered using a glass suction filter, and sequentially washed with ethanol, dichloromethane, N,N-dimethylformamide, deionized water and acetone, and then placed in a vacuum drying oven at 80°C for 8 h to obtain the porous hydrogen-bonded organic framework material;

[0055] S5, 0.0086 g of polyethylene glycol diacrylate was continuously added while stirring, and stirring was continued for 4 h to obtain a slurry;

[0056] S6, the slurry was placed in a vacuum oven, vacuum degassing was performed for 1 min without heating, the glass vial was then tightly capped, placed on a stirring table and stirred for 60 s, and then dropped onto the surface of the copper foil using a dropper and coated using a spatula.

[0057] S7, the coated copper foil was placed under a 365 nm wavelength ultraviolet lamp for 45 min to obtain a pole piece.

[0058] S8, finally, the pole piece was dried in an oven at 60°C for 2 h, and then the temperature was increased to 80°C for 2 h to obtain an ultraviolet light-cured silicon-carbon negative electrode.

[0059] Example 2: The example provides a preparation method of an ultraviolet light-cured silicon-carbon negative electrode, which comprises the following steps:

[0060] S1, 0.03 g of butyl acrylate and 0.3 g of N,N-dimethylformamide were weighed out into a 5 mL glass vial with a stirrer, mixed uniformly to obtain a polymer monomer solution;

[0061] S2, 0.0016g of diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide was added to the above polymer monomer solution while stirring, stirred for 10min, the solid was completely dissolved, the solution remained clear and transparent, a mixed solution was obtained;

[0062] S3, 300mg of silicon-carbon powder was weighed and ground in a quartz mortar for 30min, then added to the above mixed solution with a medicine spoon while stirring, and stirred for 1h; wherein the silicon-carbon powder is a product of C ONE-SC 1800 sold by Carbon One New Energy Group Co., Ltd.;

[0063] S4, 1mg of porous hydrogen-bonded organic framework material was weighed and ground in a quartz mortar for 20min, then added to the above mixed solution with a medicine spoon while stirring, and stirred for 1h; wherein the preparation method of the porous hydrogen-bonded organic framework material comprises the following steps: 2g of 3,4,9,10-perylenetetracarboxylic dianhydride and 3g of dicyanediamine are mixed and added to a mixed solvent of 20mL of N,N-dimethylformamide and 20mL of ethylene glycol to obtain a reaction solution; the reaction solution is magnetically stirred at room temperature for 4h, then transferred to a reactor, sealed and heated at 180℃ in a muffle furnace for 60h; after the reactor is cooled, the product is filtered using a glass suction filter, and then washed with ethanol, dichloromethane, N,N-dimethylformamide, deionized water and acetone in sequence, and then dried in a vacuum drying oven at 80℃ for 8h to obtain the porous hydrogen-bonded organic framework material;

[0064] S5, 0.0052g of polyethylene glycol diacrylate was continuously added while stirring, and stirred for 4h to obtain a slurry;

[0065] S6, the above slurry was placed in a vacuum oven, vacuum degassing was carried out for 1min without heating, then the glass vial was tightly capped, placed on a stirring table and stirred for 60s, and then dropped on the surface of the copper foil using a dropper and coated using a spatula.

[0066] S7, the coated copper foil was placed under a 365nm wavelength ultraviolet lamp for 40min to obtain a pole piece.

[0067] S8, finally, the pole piece was dried in a 60℃ oven for 2h, and then the temperature was increased to 80℃ for 2h to obtain an ultraviolet light-cured silicon-carbon negative electrode.

[0068] Example 3: The example provides a preparation method of an ultraviolet light-cured silicon-carbon negative electrode, which comprises the following steps:

[0069] S1, 0.07g of butyl acrylate and 1g of N,N-dimethylformamide were weighed into a 5mL glass vial with a stirrer, mixed uniformly to obtain a polymer monomer solution;

[0070] S2, 0.0037 g of diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide was added to the above polymer monomer solution while stirring, and stirred for 10 min to completely dissolve the solid, and the solution remained clear and transparent, to obtain a mixed solution;

[0071] S3, 700 mg of silicon-carbon powder was weighed and ground in a quartz mortar for 30 min, and then added to the above mixed solution while stirring with a medicine spoon, and the stirring was continued for 1 h; wherein the silicon-carbon powder was a product of C ONE-SC 1800 sold by Carbon One New Energy Group Co., Ltd.;

[0072] S4, 50 mg of porous hydrogen-bonded organic framework material was weighed and ground in a quartz mortar for 20 min, and then added to the above mixed solution while stirring with a medicine spoon, and the stirring was continued for 1 h; wherein the preparation method of the porous hydrogen-bonded organic framework material included the following steps: 2 g of 3,4,9,10-perylenetetracarboxylic dianhydride and 5 g of dicyanediamine were mixed and added to a mixed solvent of 20 mL of N,N-dimethylformamide and 20 mL of ethylene glycol to obtain a reaction solution; the reaction solution was magnetically stirred at room temperature for 4 h, then transferred to a reactor, sealed and heated in a muffle furnace at 220°C for 60 h; after the reactor was cooled, the product was filtered using a glass suction filter, and then washed with ethanol, dichloromethane, N,N-dimethylformamide, deionized water and acetone in sequence, and then dried in a vacuum drying oven at 80°C for 8 h to obtain the porous hydrogen-bonded organic framework material;

[0073] S5, 0.0121 g of polyethylene glycol diacrylate was continuously added while stirring, and the stirring was continued for 4 h to obtain a slurry;

[0074] S6, the above slurry was placed in a vacuum oven, vacuum degassing was performed for 1 min without heating, then the glass vial was tightly capped, placed on a stirring table and stirred for 60 s, and then dropped on the surface of a copper foil using a dropper and coated using a spatula.

[0075] S7, the coated copper foil was placed under a 365 nm wavelength ultraviolet lamp for irradiation for 50 min to obtain a pole piece.

[0076] S8, finally, the pole piece was dried in an oven at 60°C for 2 h, and then the temperature was increased to 80°C for 2 h to obtain an ultraviolet light-cured silicon-carbon negative electrode.

[0077] Comparative Example 1: The comparative example 1 provides a preparation method of a binder-type silicon-carbon negative electrode, which includes the following steps:

[0078] (1) Take 900 mg of silicon-carbon powder (C ONE-SC 1800, C ONE Energy Group Co., Ltd.), 50 mg of conductive carbon black (Super p), 37.5 mg of sodium carboxymethyl cellulose (CMC) and 1.25 mL of deionized water into a ball mill tank, and ball mill at a speed of 400 rpm for 2 h;

[0079] (2) Add 138.9 mg of styrene-butadiene rubber (SBR) to the above ball mill tank, and ball mill at a speed of 200 rpm for 2 h.

[0080] (3) Add 1.25 mL of deionized water to the above ball mill tank, and ball mill at a speed of 300 rpm for 1 h.

[0081] (4) Take out the ball mill tank, dry it in a vacuum drying oven for 1 min to remove bubbles, then put the slurry into a glass bottle with a magnet and stir for 1 min to prevent sedimentation and uneven distribution of the slurry. Coat the slurry on the surface of a copper foil to obtain an electrode sheet.

[0082] (5) Finally, dry the electrode sheet in a 60°C oven for 12 h to obtain a binder-type silicon-carbon negative electrode.

[0083] Performance test and characterization: I. Take a scanning electron microscope of the ultraviolet light-cured silicon-carbon negative electrode obtained in Example 1, and use a JEOL JSM-6700F scanning electron microscope to obtain a 5000x surface scanning electron microscope image as shown in Figure 2 . As can be seen from Figure 2 , the silicon-carbon negative electrode is covered by the porous hydrogen-bonded organic framework material through the wrapping of butyl acrylate, which plays a buffering role in volume expansion and can prevent the electrolyte from entering and generating excessive side reactions.

[0084] II. Battery cycle performance test: Assemble lithium ion batteries to compare the first charge performance of the ultraviolet light-cured silicon-carbon negative electrode of Comparative Example 2 and the binder-type silicon-carbon negative electrode of Comparative Example 1 at 25°C, and the results are shown in Figure 3 . It is found that the ultraviolet light-cured silicon-carbon negative electrode prepared in the present application has a higher first efficiency because the elastic butyl acrylate can encapsulate irregularly shaped silicon-carbon particles within the electrode structure, effectively buffering the volume expansion of silicon elements during battery cycling. Compared with the silicon-carbon negative electrode prepared using a traditional binder, the lithium ion battery using the ultraviolet light-cured silicon-carbon negative electrode has a higher first cycle coulombic efficiency, reaching 88.45%.

[0085] Meanwhile, compared with existing polymerization reactions, the use of photoinitiators and photopolymerization steps in the embodiments of the present invention may reduce chemical waste emissions during the preparation process and improve the environmental friendliness of the process; and the preparation process is more energy-efficient and greener. By using specific photosensitizer responses and molecular templates to limit the polymerization reaction, the thickness and performance of the electrodes can be precisely controlled, and the material properties can be customized.

[0086] In summary, the preparation process of the UV-curable silicon-carbon anode provided in this invention consists of three stages: the first stage is slurry defoaming, the second stage is UV polymerization, and the third stage is gradient drying to remove solvents and moisture. In the first stage, a vacuum oven is used to create a vacuum without heating. In this vacuum environment, air introduced into the slurry due to prolonged stirring can be expelled, resulting in a uniform and smooth coating. The absence of heating prevents excessively high temperatures from causing partial cross-linking of the polymer monomers, which could lead to uneven coating and cracks. In the second stage, UV irradiation allows the photoinitiator in the slurry to rapidly catalyze cross-linking of the polymer monomers, enabling the polymer to fully encapsulate irregularly shaped silicon-carbon particles within the electrode structure. If the irradiation time is too short, the polymer cannot fully cross-link, leading to the volatilization of uncross-linked polymer during subsequent drying and resulting in coating cracks. If the irradiation time is too long, the intense UV light can cause polymer aging, affecting the polymer's elasticity and the degree of coating on the electrode, thus impacting subsequent battery performance. The third stage involves gradient temperature drying to remove solvents and moisture from the coating. Initial low-temperature drying allows the coating to form a crack-free surface with high mechanical strength, suppressing the stress caused by subsequent high-temperature drying. However, if the drying temperature is too low or the drying time is too short, the surface-forming dry film will not protect the coating; if the temperature is too high, the drying rate will be too fast, leading to cracks on the coating surface. The subsequent high-temperature drying after the low-temperature drying allows for further evaporation of solvents and moisture from the coating. If the subsequent drying temperature is too low or the drying time is too short, the removal of solvents and moisture will be insufficient, affecting the adhesion between the coating and the current collector; if the drying temperature is too high, it will also cause polymer denaturation, affecting its mechanical properties and the coating of silicon-carbon particles.

[0087] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification.

Claims

1. A UV-curable silicon-carbon anode material, characterized in that, It comprises the following components by weight: 3-7 parts polymer monomer, 0.16-0.37 parts photoinitiator, 0.52-1.21 parts crosslinking agent, 30-70 parts silicon carbide powder, 0.1-5 parts porous material, and 30-70 parts solvent; wherein the polymer monomer is butyl acrylate; and the porous material is a porous hydrogen-bonded organic framework material.

2. The UV-curable silicon-carbon anode material according to claim 1, characterized in that, The photoinitiator is diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide; the crosslinking agent is polyethylene glycol diacrylate.

3. The UV-curable silicon-carbon anode material according to claim 1, characterized in that, The solvent is N,N-dimethylformamide.

4. The UV-curable silicon-carbon anode material according to claim 1, characterized in that, The method for preparing the porous material includes the following steps: 3,4,9,10-perylenetetracarboxylic dianhydride and dicyandiamide were mixed and added to N,N-dimethylformamide and ethylene glycol to obtain a reaction solution; The reaction solution is heated and reacted, the resulting product is filtered, and then washed and dried to obtain the porous material.

5. The UV-curable silicon-carbon anode material according to claim 4, characterized in that, The mass ratio of 3,4,9,10-perylenetetracarboxylic dianhydride to dicyandiamide is 1:(1.5-2.5).

6. The UV-curable silicon-carbon anode material according to claim 1, characterized in that, The temperature for the heating reaction of the porous material is 180-220℃.

7. A method for preparing a UV-curable silicon-carbon anode material as described in any one of claims 1-6, characterized in that, Includes the following steps: The polymer monomers are mixed with the solvent; Add the photoinitiator dropwise while stirring; Add silicon carbide powder while stirring; Add the porous material while stirring; A crosslinking agent was added dropwise while stirring to obtain a UV-curable silicon-carbon anode material.

8. The application of a UV-curable silicon-carbon anode material as described in any one of claims 1-6 in the preparation of lithium-ion batteries.

9. The application according to claim 8, characterized in that, The lithium-ion battery includes a positive electrode and a negative electrode, and the method for preparing the negative electrode includes the following steps: The UV-curable silicon-carbon anode material is vacuum defoamed and then coated onto the current collector. The current collector coated with the UV-curable silicon-carbon anode material is UV-cured and then subjected to gradient drying to obtain the anode.

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