Preparation method of using prelithiated Ti-MWW molecular sieve as anode material for lithium-ion battery

Abstract

The present invention relates to a preparation method of using pre-lithiated Ti-MWW molecular sieve as the anode material of a lithium-ion battery, belonging to the field of lithium-ion batteries. The preparation method includes the following steps: (1) Pretreatment: Wash, filter, dry, and then calcine the Ti-MWW molecular sieve to obtain solid S1; (2) Pre-lithiation: Mix solid S1 with a lithium chloride solution and conduct a heating reflux reaction. After completion, filter, wash, filter again, and dry to obtain solid S2; (3) Preparation of the anode material: Mix solid S2 with carbon black and polyvinylidene fluoride and grind to obtain solid S3. Disperse solid S3 into N-dimethylpyrrolidone to obtain the anode slurry. Coat the anode slurry onto a copper foil, and then obtain the product after drying and rolling. The present invention uses pre-lithiated molecular sieve as the anode material of a lithium-ion battery, which has excellent discharge specific capacity; this lithium-ion battery anode material uses waste Ti-MWW molecular sieve as the raw material, which helps to realize the recycling and reuse of solid waste and reduce costs.

Description

Technical Field

[0001] The present invention relates to a preparation method of using pre-lithiated Ti-MWW molecular sieve as the anode material of a lithium-ion battery, belonging to the field of lithium-ion batteries. Technical Background

[0002] With the increasing consumption of fossil energy, the resulting greenhouse effect and environmental pollution are becoming more and more serious. People are increasingly aware of the importance of developing and utilizing sustainable energy. Among various new energy sources, lithium-ion batteries have been pursued by modern people due to their excellent properties such as high voltage, high specific capacity, long cycle life, and no pollution to the environment. Currently, they have successfully replaced other types of secondary batteries in 3C products, becoming the dominant product in power supply devices, and gradually becoming a green energy battery representing the future development direction. They are also considered to be the leader in the future energy storage and power supply industries.

[0003] A lithium-ion battery mainly consists of a positive electrode, a negative electrode, an electrolyte, a separator, and external connection and packaging components. The working principle of a lithium-ion battery: During the charging process, lithium ions are removed from the lattice of the positive electrode material and transported through the electrolyte to the lattice of the negative electrode material, making the negative electrode in a lithium-rich state and the positive electrode in a lithium-poor state. Electrons are compensated to the negative electrode by the external circuit to ensure the charge balance of the negative electrode, and the discharging process is just the opposite. During the process of lithium ion insertion and extraction, the chemical structure of the electrode material remains basically unchanged, thus ensuring the reversibility of the charge and discharge process.

[0004] The application of traditional commercial graphite anode materials in lithium-ion batteries has achieved great success, and after continuous improvement, it is close to its theoretical capacity of 372 mAh / g, but still cannot meet the safety requirements of modern electronic / electrical equipment. At the same time, because its lithium insertion potential is close to that of metallic lithium and it is highly sensitive to the electrolyte, there are also certain safety hazards.

[0005] In recent years, due to the depletion of fossil fuels and environmental pollution, the development of low-cost and high-performance batteries has become the focus of research. As silicon, the second most abundant element in the earth's crust, the theoretical specific capacity of its oxide, silicon dioxide, is as high as 1965 mAh / g. At the same time, silicon dioxide-based materials have a relatively low lithium insertion / extraction potential, can effectively avoid the generation of lithium dendrites, and this material is non-combustible, reducing safety hazards to a certain extent. Therefore, silicon dioxide-based materials are considered to be the most promising anode materials for the next generation of lithium-ion batteries. Summary of the Invention

[0006] The purpose of the present invention is to provide a preparation method of using pre-lithiated Ti-MWW molecular sieve as the anode material of a lithium-ion battery. This lithium-ion battery anode material has the advantages of low cost and high safety.

[0007] The technical solution of the preparation method of using pre-lithiated Ti-MWW molecular sieve as the anode material of a lithium-ion battery of the present invention is as follows:

[0008] A preparation method of using pre-lithiated Ti-MWW molecular sieve as the anode material of a lithium-ion battery, comprising the following steps:

[0009] (1) Pretreatment: Wash, filter, dry and then calcine the Ti-MWW molecular sieve to obtain solid S1.

[0010] (2) Pre-lithiation: Mix solid S1 with a lithium chloride solution and heat for reflux reaction. After the reaction ends, filter, wash, filter again and dry to obtain solid S2.

[0011] (3) Preparation of the anode material: Mix solid S2 with carbon black and polyvinylidene fluoride and grind to obtain solid S3. Then disperse solid S3 into N-dimethylpyrrolidone to obtain the anode slurry. Coat the anode slurry on a copper foil, and obtain the product after drying and rolling.

[0012] In this application, first, the Ti-MWW molecular sieve scrapped after the ammoximation reaction is washed, filtered, dried and then calcined. The solid obtained by calcination is mixed evenly with the lithium chloride solution and heated for reflux for pre-lithiation treatment. Then filter, wash and dry. Finally, it is mixed with carbon black and polyvinylidene fluoride and ground, and dispersed into N-dimethylpyrrolidone to prepare the anode slurry. Coat the anode slurry on a copper foil, and obtain the anode material after drying and rolling.

[0013] Preferably, in step (1), the Ti-MWW molecular sieve is a MWW type titanium silicate molecular sieve, and the silicon-titanium molar ratio of the MWW type titanium silicate molecular sieve is 10-50, and the optimal silicon-titanium molar ratio of the MWW type titanium silicate molecular sieve is 20-40; the average particle size of the Ti-MWW molecular sieve is 0.05-50 μm, and the optimal average particle size of the Ti-MWW molecular sieve is 0.1-10 μm. This application uses the scrapped Ti-MWW molecular sieve as the raw material of the anode material, which helps to realize the recycling and reuse of solid waste and reduce the cost of the anode material.

[0014] Further preferably, in step (1), the calcination temperature is 400-700 °C, and the optimal calcination temperature is 450-550 °C; the calcination time is 2-12 h, and the optimal calcination time is 5-8 h.

[0015] Preferably, in step (2), the mass ratio of the lithium chloride solution to solid S1 is 5-50, and the optimal mass ratio is 10-30.

[0016] Further preferably, in step (2), the reflux reaction is carried out under ultraviolet light irradiation, the wavelength range of the ultraviolet light is 100-400 nm, the optimal wavelength range is 200-300 nm, the reflux reaction temperature is 30-90 °C, the optimal reflux temperature is 50-80 °C, and the reflux reaction time is 2-12 h, and the optimal reflux reaction time is 5-10 h.

[0017] Even further preferably, in step (2), the reagent used for washing is a lithium chloride solution or pure water.

[0018] Preferably, the lithium chloride solution is an aqueous lithium chloride solution, and the concentration of the lithium chloride solution is 1×10 -3 ~2 mol / L, and the optimal concentration is 0.5~2 mol / L.

[0019] Preferably, in step (2), the molar ratio of lithium ions to titanium atoms in the solid S2 is 0.1-10, and the optimal molar ratio is 2-8.

[0020] Preferably, in step (3), the grinding time is 0.5-5 h, the optimal grinding time is 1-3 h, the particle size of the solid S3 is 50-300 mesh, and the optimal particle size is 100-200 mesh.

[0021] Beneficial effects:

[0022] Using the prelithiated Ti-MWW molecular sieve of the present invention as the anode material of a lithium-ion battery has excellent discharge specific capacity and high safety; in addition, the anode of the lithium-ion battery of the present invention is prepared from waste Ti-MWW molecular sieve, which helps to realize the recycling and reuse of solid waste and has the advantage of low cost. Description of the drawings

[0023] Figure 1 It is the SEM image of the prelithiated waste Ti-MWW molecular sieve (solid S2) in Example 1 of the present invention;

[0024] Figure 2 It is the N2 adsorption-desorption curve of the prelithiated waste Ti-MWW molecular sieve (solid S2) in Example 1 of the present invention;

[0025] Figure 3 It is the SEM image of the prelithiated fresh Ti-MWW molecular sieve (solid S2) in Comparative Example 2 of the present invention;

[0026] Figure 4 It is the N2 adsorption-desorption curve of the prelithiated fresh Ti-MWW molecular sieve (solid S2) in Comparative Example 2 of the present invention;

[0027] Figure 5Cycling performance data graph of a button cell prepared with pre-lithiated scrapped Ti-MWW molecular sieve as the negative electrode material in Example 1 of the present invention. Detailed implementation mode

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments.

[0029] A preparation method of using pre-lithiated Ti-MWW molecular sieve as the negative electrode material of a lithium-ion battery, comprising the following steps:

[0030] (1) Pretreatment: Wash, filter, dry and then calcine the Ti-MWW molecular sieve to obtain solid S1; the Ti-MWW molecular sieve is a MWW type titanium silicate molecular sieve, and the silicon-titanium molar ratio and average particle size of the MWW type titanium silicate molecular sieve are 10-50 and 0.05-50 μm respectively; the calcination temperature and time are 400-700 °C and 2-12 h respectively;

[0031] (2) Pre-lithiation: Mix a lithium chloride solution with a mass ratio of 5-50 with solid S1, and then heat and reflux for 2-12 h under ultraviolet light irradiation with a wavelength of 100-400 nm at 30-90 °C. After the reaction, filter, wash, filter again and dry to obtain solid S2 with a lithium ion to titanium atom molar ratio of 0.1-10; the reagent used for washing is a lithium chloride solution or pure water; the lithium chloride solution is an aqueous lithium chloride solution, and the concentration of the lithium chloride solution is 1×10 -3 ~2 mol / L;

[0032] (3) Preparation of the negative electrode material: Mix solid S2, carbon black and polyvinylidene fluoride with a mass ratio of 85:10:5 and grind for 0.5-5 h to obtain solid S3 with a particle size of 50-300 mesh, and then disperse solid S3 into N-dimethylpyrrolidone to obtain a negative electrode slurry. Coat the negative electrode slurry on a copper foil, and obtain it after drying and rolling.

[0033] The technical solution of the present invention will be further described below in conjunction with the detailed implementation mode.

[0034] Example 1

[0035] A preparation method of using pre-lithiated Ti-MWW molecular sieve as the negative electrode material of a lithium-ion battery, comprising the following steps:

[0036] (1) Pretreatment: Wash, filter, dry and then calcine 2 g of the scrapped Ti-MWW molecular sieve with a silicon-titanium molar ratio (SiO2 / TiO2) of 20 and an average particle size of 2 μm after the ammoximation reaction at 550 °C for 6 h to obtain solid S1;

[0037] (2) Prelithiation: Mix 1 g of solid S1 with 20 g of a lithium chloride solution with a concentration of 2 mol / L, heat the mixture to 80 °C under ultraviolet light with a wavelength of 270 nm, and reflux for 8 h. After the reaction, filter, wash with an aqueous lithium chloride solution with a concentration of 1 mol / L, filter again, and dry to obtain solid S2 with a molar ratio of lithium ions to titanium atoms of 6.3. Among them, the scanning electron micrograph of the prelithiated waste Ti-MWW molecular sieve (solid S2) is as shown in Figure 1 shown;

[0038] (3) Preparation of the negative electrode material: Mix 0.85 g of solid S2, 0.1 g of carbon black, and 0.05 g of polyvinylidene fluoride, and grind them with a ball mill for 3 h to obtain solid S3 with a particle size of 200 mesh. Then disperse solid S3 into N-dimethylpyrrolidone to prepare a negative electrode slurry, and coat the negative electrode slurry on a copper foil, followed by drying and rolling to obtain the product.

[0039] In this example, the N2 adsorption-desorption curve of the prelithiated waste Ti-MWW molecular sieve (solid S2) is as shown in Figure 2 shown, and its total specific surface area and total pore volume are shown in Table 1 below:

[0040] Table 1 Total specific surface area and total pore volume of the prelithiated waste Ti-MWW molecular sieve in Example 1

[0041] Sample <![CDATA[Total specific surface area (m 2 / g)]]> <![CDATA[Total pore volume (cm 3 / g)]]> Scrapped Ti-MWW after calcination 346 0.23

[0042] Example 2

[0043] A preparation method of using prelithiated Ti-MWW molecular sieve as the negative electrode material of a lithium-ion battery, comprising the following steps:

[0044] (1) Pretreatment: Wash, filter, and dry 2 g of the waste Ti-MWW molecular sieve with a silicon-titanium molar ratio (SiO2 / TiO2) of 30 and an average particle size of 3 μm after the ammoximation reaction, and then calcine it at 550 °C for 5 h to obtain solid S1;

[0045] (2) Prelithiation: Mix 1 g of solid S1 with 20 g of a lithium chloride solution with a concentration of 0.5 mol / L, heat the mixture to 60 °C under ultraviolet light with a wavelength of 300 nm, and reflux for 6 h. After the reaction, filter, wash with pure water, filter again, and dry to obtain solid S2 with a molar ratio of lithium ions to titanium atoms of 4.3;

[0046] (3) Preparation of the negative electrode material: Mix 0.85 g of solid S2, 0.1 g of carbon black, and 0.05 g of polyvinylidene fluoride, and grind them with a ball mill for 1.5 h to obtain solid S3 with a particle size of 100 mesh. Then disperse solid S3 into N-dimethylpyrrolidone to prepare the negative electrode slurry, coat the negative electrode slurry onto a copper foil, and obtain the product after drying and rolling.

[0047] Example 3

[0048] A preparation method of using pre-lithiated Ti-MWW molecular sieve as the negative electrode material of a lithium-ion battery, comprising the following steps:

[0049] (1) Pretreatment: Wash, filter, and dry 2 g of Ti-MWW molecular sieve with a silicon-titanium molar ratio (SiO2 / TiO2) of 35 and an average particle size of 5 μm after the ammoximation reaction, and then calcine it at 600 °C for 8 h to obtain solid S1.

[0050] (2) Pre-lithiation: Mix 1 g of solid S1 with 15 g of a lithium chloride solution with a concentration of 0.5 mol / L, heat it to 40 °C under ultraviolet light with a wavelength of 250 nm, and reflux for 4 h. After the reaction, filter, wash with pure water, filter again, and dry to obtain solid S2 with a lithium ion to titanium atom molar ratio of 3.2.

[0051] (3) Preparation of the negative electrode material: Mix 0.85 g of solid S2, 0.1 g of carbon black, and 0.05 g of polyvinylidene fluoride, and grind them with a ball mill for 2 h to obtain solid S3 with a particle size of 150 mesh. Then disperse solid S3 into N-dimethylpyrrolidone to prepare the negative electrode slurry, coat the negative electrode slurry onto a copper foil, and obtain the product after drying and rolling.

[0052] Example 4

[0053] A preparation method of using pre-lithiated Ti-MWW molecular sieve as the negative electrode material of a lithium-ion battery, comprising the following steps:

[0054] (1) Pretreatment: Wash, filter, and dry 2 g of Ti-MWW molecular sieve with a silicon-titanium molar ratio (SiO2 / TiO2) of 25 and an average particle size of 1 μm after the ammoximation reaction, and then calcine it at 500 °C for 8 h to obtain solid S1.

[0055] (2) Pre-lithiation: Mix 1 g of solid S1 with 30 g of a lithium chloride solution with a concentration of 1 mol / L, heat it to 80 °C under ultraviolet light with a wavelength of 300 nm, and reflux for 10 h. After the reaction, filter, wash with a lithium chloride aqueous solution with a concentration of 0.5 mol / L, filter again, and dry to obtain solid S2 with a lithium ion to titanium atom molar ratio of 5.9.

[0056] (3) Preparation of the negative electrode material: Mix 0.85 g of solid S2, 0.1 g of carbon black, and 0.05 g of polyvinylidene fluoride, and grind them with a ball mill for 3 h to obtain solid S3 with a particle size of 200 mesh. Then disperse solid S3 into N-dimethylpyrrolidone to prepare the negative electrode slurry. Coat the negative electrode slurry onto a copper foil, and after drying and rolling, the negative electrode material is obtained.

[0057] Comparative Example 1

[0058] A preparation method of using pre-lithiated Ti-MWW molecular sieve as the negative electrode material of a lithium-ion battery, comprising the following steps:

[0059] (1) Pretreatment: Wash, filter, and dry 2 g of Ti-MWW molecular sieve with a silicon-titanium molar ratio (SiO2 / TiO2) of 20 and an average particle size of 2 μm after ammoximation reaction, and then calcine it at 550 °C for 6 h to obtain solid S1.

[0060] (2) Pre-lithiation: Mix 1 g of solid S1 with 20 g of a lithium chloride solution with a concentration of 2 mol / L, heat it to 80 °C, and reflux for 8 h. After the reaction, filter, wash with a lithium chloride aqueous solution with a concentration of 1 mol / L, filter again, and dry to obtain solid S2 with a molar ratio of lithium ions to titanium atoms of 2.5.

[0061] (3) Preparation of the negative electrode material: Mix 0.85 g of solid S2, 0.1 g of carbon black, and 0.05 g of polyvinylidene fluoride, and grind them with a ball mill for 3 h to obtain solid S3 with a particle size of 200 mesh. Then disperse solid S3 into N-dimethylpyrrolidone to prepare the negative electrode slurry. Coat the negative electrode slurry onto a copper foil, and after drying and rolling, the negative electrode material is obtained.

[0062] Comparative Example 2

[0063] A preparation method of using pre-lithiated Ti-MWW molecular sieve as the negative electrode material of a lithium-ion battery, comprising the following steps:

[0064] (1) Pretreatment: Wash, filter, and dry 2 g of fresh Ti-MWW molecular sieve with a silicon-titanium molar ratio (SiO2 / TiO2) of 20 and an average particle size of 2 μm, and then calcine it at 550 °C for 6 h to obtain solid S1.

[0065] (2) Pre-lithiation: Mix 1 g of solid S1 with 20 g of a lithium chloride solution with a concentration of 2 mol / L, heat it to 80 °C under ultraviolet light with a wavelength of 270 nm, and reflux for 8 h. After the reaction, filter, wash with a lithium chloride aqueous solution with a concentration of 1 mol / L, filter again, and dry to obtain solid S2 with a molar ratio of lithium ions to titanium atoms of 4.1. Among them, the scanning electron microscope image of the fresh pre-lithiated Ti-MWW molecular sieve (solid S2) is as Figure 3 shown;

[0066] (3) Prepare the negative electrode material. Mix 0.85 g of solid S2, 0.1 g of carbon black, and 0.05 g of polyvinylidene fluoride, and grind them with a ball mill for 3 h to obtain solid S3 with a particle size of 200 mesh. Then disperse solid S3 into N - dimethylpyrrolidone to prepare the negative electrode slurry, and coat the negative electrode slurry onto a copper foil, followed by drying and rolling to obtain the product.

[0067] In this comparative example, the N2 adsorption - desorption curve of the prelithiated fresh Ti - MWW molecular sieve (solid S2) is as Figure 4 shown.

[0068] Comparative Example 3

[0069] A preparation method of using prelithiated Ti - MWW molecular sieve as the negative electrode material of a lithium - ion battery, comprising the following steps:

[0070] (1) Pretreatment: Wash, filter, and dry 2 g of Ti - MWW molecular sieve with a silicon - titanium molar ratio (SiO2 / TiO2) of 20 and an average particle size of 2 μm, which is scrapped after the ammoximation reaction, to obtain solid S1;

[0071] (2) Prelithiation: Mix 1 g of solid S1 with 20 g of a lithium chloride solution with a concentration of 2 mol / L, heat it to 80 °C under ultraviolet light with a wavelength of 270 nm, and reflux for 8 h. After the reaction, filter, wash with an aqueous lithium chloride solution with a concentration of 1 mol / L, filter again, and dry to obtain solid S2 with a molar ratio of lithium ions to titanium atoms of 1.8;

[0072] (3) Prepare the negative electrode material. Mix 0.85 g of solid S2, 0.1 g of carbon black, and 0.05 g of polyvinylidene fluoride, and grind them with a ball mill for 3 h to obtain solid S3 with a particle size of 200 mesh. Then disperse solid S3 into N - dimethylpyrrolidone to prepare the negative electrode slurry, and coat the negative electrode slurry onto a copper foil, followed by drying and rolling to obtain the product.

[0073] The total specific surface area and total pore volume of the prelithiated scrapped Ti - MWW molecular sieve in this comparative example are shown in Table 2 below:

[0074] Table 2 Total specific surface area and total pore volume of the prelithiated scrapped Ti - MWW molecular sieve in Comparative Example 3

[0075] Sample <![CDATA[Total specific surface area (m 2 / g)]]> <![CDATA[Total pore volume (cm 3 / g)]]> Scrapped Ti-MWW after calcination 158 0.11

[0076] Comparative Example 4

[0077] A preparation method of using prelithiated Ti - MWW molecular sieve as the negative electrode material of a lithium - ion battery, comprising the following steps:

[0078] (1) Pretreatment: The Ti-MWW molecular sieve with a silicon-titanium molar ratio (SiO2 / TiO2) of 20 and an average particle size of 2 μm, which was scrapped after the ammoximation reaction of 2 g, was washed, filtered, dried, and then calcined at 550 °C for 6 h to obtain solid S1.

[0079] (2) Preparation of the negative electrode material: 0.85 g of solid S1, 0.1 g of carbon black, and 0.05 g of polyvinylidene fluoride were mixed and ground in a ball mill for 3 h to obtain solid S2 with a particle size of 200 mesh. Then, solid S2 was dispersed in N-dimethylpyrrolidone to obtain a negative electrode slurry, and the negative electrode slurry was coated on a copper foil and obtained after drying and rolling.

[0080] The materials of Examples 1-4 and Comparative Examples 1-4 above were used as the negative electrode of a lithium-ion battery, lithium iron phosphate was used as the positive electrode, a solution of 1 mol / L LiPF6 in EC / DMC / EMC (volume ratio 1:1:1) was used as the electrolyte, and a polypropylene film was used to separate the positive electrode from the negative electrode to assemble a CR2025 type button battery. The initial discharge specific capacity and cycle stability performance were tested. The cycle performance data of the battery prepared in Example 1 are as Figure 5 shown, the current density was 0.5 C, and the experimental results are shown in Table 3.

[0081] Table 3 Statistical table of cycle performance

[0082]

[0083]

[0084] In summary: (1) It can be seen from Example 1 and Comparative Example 1 that ultraviolet light treatment can effectively enhance the prelithiation ability of the molecular sieve, increase the number of lithium ions in the molecular sieve, and thus effectively improve its specific capacity.

[0085] (2) It can be seen from Example 1 and Comparative Example 2 that the fresh Ti-MWW molecular sieve is not conducive to the insertion and extraction of lithium ions due to its own microporous structure (see the Figure 4 N2 adsorption-desorption curve), so its specific capacity is relatively low. The scrapped Ti-MWW molecular sieve not only has micropores, but also has more intercrystalline pore structures due to the decrease in crystallinity during the reaction process (see the Figure 2 N2 adsorption-desorption curve), which is conducive to the insertion and extraction of lithium ions, thus helping to improve its specific capacity.

[0086] (3) As can be seen from Example 1 and Comparative Example 3, the specific surface area and pore volume of the uncalcined waste Ti-MWW molecular sieve are small (see Table 2), which is not conducive to the insertion and extraction of lithium ions, so its specific capacity is low. After calcination, the specific surface area and pore volume of the waste Ti-MWW molecular sieve are greatly increased (see Table 1), reducing the lithium ion diffusion path, facilitating the insertion and extraction of lithium ions, improving the electron transport ability, and thus contributing to the increase of its specific capacity.

[0087] (4) As can be seen from Example 1 and Comparative Example 4, the first discharge specific capacity of the battery anode material without prelithiation treatment is small and its cycle stability is poor, indicating that prelithiation treatment can improve the specific capacity of the electrode material and enhance its cycle stability.

[0088] The present invention uses prelithiated molecular sieve as the anode material of lithium-ion battery, which has excellent discharge specific capacity; in addition, the anode of the lithium-ion battery of the present invention uses waste Ti-MWW molecular sieve as raw material, which helps to realize the recycling and reuse of solid waste and has the advantage of low cost.

Claims

1. A preparation method of using pre-lithiated Ti-MWW molecular sieve as the anode material of a lithium-ion battery, characterized in that, It includes the following steps: (1) Pretreatment: Wash, filter, dry and then calcine the Ti-MWW molecular sieve to obtain solid S1; the Ti-MWW molecular sieve is the Ti-MWW molecular sieve scrapped after the ammoximation reaction; the calcination temperature is 400-700 °C, and the calcination time is 2-12 h; (2) Prelithiation: Mix solid S1 with a lithium chloride solution and heat for reflux reaction. After the reaction, filter, wash, filter again and dry to obtain solid S2; the reflux reaction is carried out under ultraviolet light irradiation, and the ultraviolet light wavelength range is 100-400 nm; (3) Prepare the anode material: Mix solid S2 with carbon black and polyvinylidene fluoride and grind to obtain solid S3. Then disperse solid S3 into N-dimethylpyrrolidone to obtain the anode slurry. Coating the anode slurry on the copper foil and drying and rolling it to obtain the product.

2. The preparation method of using prelithiated Ti-MWW molecular sieve as the anode material of a lithium-ion battery according to claim 1, characterized in that, In step (1), the Ti-MWW molecular sieve is the MWW type titanium silicate molecular sieve, and the silicon-titanium molar ratio of the MWW type titanium silicate molecular sieve is 10-50; the average particle size of the Ti-MWW molecular sieve is 0.05-50 μm.

3. The preparation method of using pre-lithiated Ti-MWW molecular sieve as the anode material of a lithium-ion battery according to claim 1, characterized in that, In step (2), the mass ratio of the lithium chloride solution to solid S1 is 5-50.

4. The preparation method of using prelithiated Ti-MWW molecular sieve as the anode material of a lithium-ion battery according to claim 1, characterized in that In step (2), the reflux reaction temperature is 30-90 °C, and the reaction time is 2-12 h.

5. The preparation method of using the prelithiated Ti-MWW molecular sieve as the anode material of a lithium-ion battery according to claim 1, characterized in that, In step (2), the reagent used for washing is the lithium chloride solution or pure water.

6. The preparation method of using prelithiated Ti-MWW molecular sieve as the anode material of a lithium-ion battery as described in claim 1 or 5, characterized in that, The lithium chloride solution is an aqueous solution of lithium chloride, and the concentration of the lithium chloride solution is 1×10 -3 to 2 mol / L.

7. The preparation method of using pre-lithiated Ti-MWW molecular sieve as the anode material of a lithium-ion battery according to claim 1, characterized in that, In step (2), the molar ratio of lithium ions to titanium atoms in solid S2 is 0.1-10.

8. The preparation method of using the prelithiated Ti-MWW molecular sieve as the anode material of a lithium-ion battery according to claim 1, characterized in that, In step (3), the grinding time is 0.5-5 h, and the particle size of solid S3 is 50-300 mesh.

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