Lithium battery negative electrode material MoS2 as well as preparation method and application thereof

Abstract

The invention provides a lithium battery negative electrode material MoS2 and a preparation method and application thereof.The preparation method comprises the following steps that S1, sodium molybdate dihydrate is taken and added into a glucose solution, thiourea is added after dissolution, dissolution continues, and a solution before reaction is obtained; the mass volume ratio of the sodium molybdate dehydrate to the thiourea to the glucose solution is 1g: (2-3g): (40-50mL); s2, transferring the solution before reaction into a polytetrafluoroethylene hydrothermal kettle, sealing, carrying out hydrothermal reaction at 180-200 DEG C for 12-36 hours to obtain a black precipitate, and carrying out ultrasonic treatment, cleaning and drying on the black precipitate to obtain a black product; and S3, in an inert gas atmosphere, carrying out annealing treatment on the black product, and cooling to obtain the MoS2 material. The MoS2 nanoflower prepared by the preparation method disclosed by the invention, as a negative electrode material of a battery, shows excellent cycling stability, rate capability and excellent morphological characteristics in the aspect of a battery material, shows excellent electrochemical performance, and provides reliable support for application of the MoS2 nanoflower in the field of batteries.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery technology, and in particular to a lithium battery anode material MoS2, its preparation method, and its applications. Background Technology

[0002] In the current context, traditional energy sources face challenges including resource scarcity, declining quality, and environmental pollution. Therefore, researching and developing new green energy sources has become a central part of my country's energy strategy. Chemical power sources, as a core component of the new energy industry revolution, effectively address the instability issues of new energy sources. The rapid development of electric vehicles and grid energy storage has spurred the rapid development of clean and efficient electrochemical energy storage materials technology.

[0003] Due to its unique layered structure, MoS2 possesses variable atomic coordination and electronic structure characteristics, exhibiting strong interactions between electrons and the normal mode quanta (phonons) of lattice vibrations. Furthermore, the weak van der Waals forces between the layers facilitate the insertion and extraction of light metal ions (such as lithium, sodium, and magnesium ions), and MoS2 itself displays excellent double-layer charge storage capacity. Simultaneously, the oxidation state of molybdenum atoms can vary between +2 and +6. These properties determine that molybdenum disulfide has a high theoretical lithium-ion storage capacity, making it a high-performance chemical power source electrode material, thus attracting widespread research attention. Compared to bulk materials, nanoscale MoS2 has broader application potential due to its larger specific surface area, higher adsorption capacity, stronger reactivity, and unique quantum effects. Recently, various MoS2 nanoelectrode materials have emerged. However, there is still room for improvement in the preparation methods of MoS2 nanoelectrode materials. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide a lithium-ion battery anode material MoS2, its preparation method, and its applications. The reagents used in this invention are inexpensive and readily available, and a simple hydrothermal synthesis method can effectively prepare a uniformly distributed MoS2 powder product. The MoS2 preparation method provided by this invention is simple to operate, low in cost, and yields considerable output, providing a beneficial research direction for the future large-scale production of MoS2 powder products.

[0005] The technical solution of this invention is implemented as follows:

[0006] The MoS2 anode material studied in this invention is formed by stacking nanosheets to create a uniform and dispersed nanoflower structure. The diameter of each nanoflower is approximately between 0.5 and 1 μm. The MoS2 anode material prepared by this invention contains abundant microporous structure and has a good ability to absorb electrolyte, enabling lithium-ion batteries using MoS2 as the anode material to have good cycle stability.

[0007] A method for preparing MoS2, a lithium-ion battery anode material, includes the following steps:

[0008] S1: Sodium molybdate dihydrate is added to a glucose solution, dissolved, and then thiourea is added. Dissolution continues to obtain the solution before the reaction. The mass-volume ratio of sodium molybdate dihydrate, thiourea, and glucose solution is 1g:2-3g:40-50mL. In this invention, sodium molybdate dihydrate is first added to a glucose solution, and then thiourea is added. Through the action of glucose, molybdenum disulfide nanoflowers are formed. Without the addition of glucose, nanofiber-like morphology is formed, the surface area is reduced, and the electrochemical performance is poor. In this invention, by adding a certain amount of glucose solution, the diameter of each nanoflower is approximately between 0.5 and 1μm. Excessive amount will lead to uneven nanoflower size.

[0009] S2: Transfer the solution before reaction to a polytetrafluoroethylene hydrothermal reactor, seal it, and hydrothermally react at 180-200℃ for 12-36 hours to obtain a black precipitate. Sonicate, clean and dry the black precipitate to obtain a black product.

[0010] S3: The black product was annealed and cooled in an inert gas atmosphere to obtain MoS2 material.

[0011] A further embodiment is characterized in that the concentration of the glucose solution is 0.02–0.04 M.

[0012] A further proposed approach is to use a hydrothermal reaction at a temperature of 180–200°C for 12–24 hours in step S2.

[0013] A further option is that, in step S2, the drying temperature is 60–80°C and the drying time is 12–24 hours.

[0014] A further option is that, in step S3, the annealing temperature is 700–900°C and the time is 1–4 hours.

[0015] On the one hand, the present invention provides MoS2 material prepared by the above-described preparation method.

[0016] On the other hand, the present invention provides the application of the above-mentioned MoS2 material in the preparation of lithium batteries.

[0017] A further approach is the application of the MoS2 material in the preparation of lithium battery anode materials.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] This invention uses sodium molybdate dihydrate and thiourea as raw materials to prepare MoS2 material via a hydrothermal method. The preparation method is simple, easy to operate, and uses few raw materials. By synthesizing a nanoflower structure, the pore size is maintained at 0.5-1 μm. As a negative electrode material for lithium-ion batteries, it can prevent problems such as electrode shattering and damage during lithium-ion adsorption and desorption, and effectively improve the capacity and cycle life of the battery.

[0020] The MoS2 nanoflowers prepared in this invention exhibit excellent cycle stability, rate performance, and superior morphology as a negative electrode material for batteries. Samples synthesized via a hydrothermal method demonstrate stable specific capacity under varying current densities, especially maintaining a certain capacity level even at high current densities. When the current returns to its initial level, the capacity essentially recovers to its original state, showcasing its excellent electrochemical performance and providing reliable support for its application in the battery field.

[0021] The hydrothermal method employed in this invention demonstrates significant advantages in the preparation of MoS2 nanoflowers. It is not only simple, efficient, and low-cost in operation, but also holds significant promise for large-scale production. Based on experimental data and conclusions, this invention successfully reveals the application potential and value of MoS2 nanoflowers prepared via the hydrothermal method in the field of lithium-ion battery anode materials. These research results provide important references and inspiration for the further development of future battery technology, and offer new perspectives and research directions for in-depth study of the morphology and properties of MoS2 nanoflowers. Attached Figure Description

[0022] Figure 1 This is the XRD pattern of the MoS2 material in Example 1 of the present invention.

[0023] Figure 2 The figures show the nitrogen isothermal adsorption-desorption curves and pore size distribution of the MoS2 material in Example 1 of this invention.

[0024] Figure 3 The images show scanning electron microscope (SEM) images and electron energy spectrum diagrams of the MoS2 material in Example 1 of this invention.

[0025] Figure 4 This is a transmission electron microscope (TEM) image of the MoS2 material in Example 1 of the present invention.

[0026] Figure 5 This is the AC impedance spectrum of the MoS2 material in Example 1 of the present invention.

[0027] Figure 6 This is the cyclic voltammetry (CV) diagram of the MoS2 material in Example 1 of the present invention.

[0028] Figure 7This is a charge-discharge curve of the MoS2 material in Example 1 of the present invention under a current density of 0.5 A / g for the first three cycles.

[0029] Figure 8 This is a graph showing the MoS2 material of Example 1 of the present invention after 200 cycles at a current density of 0.5 A / g.

[0030] Figure 9 This is a rate performance curve of the MoS2 material in Example 1 of the present invention. Detailed Implementation

[0031] To better understand the technical content of this invention, specific embodiments are provided below to further illustrate the invention.

[0032] Unless otherwise specified, the experimental methods used in the embodiments of this invention are all conventional methods.

[0033] Unless otherwise specified, all materials and reagents used in the embodiments of this invention are commercially available.

[0034] Example 1 - Preparation of MoS2 materials

[0035] ① Weigh 0.3g of sodium molybdate dihydrate (Na2MoO4·2H2O) using an electronic balance and add it to 40mL of 0.03M glucose solution. Stir magnetically until it is completely dissolved.

[0036] ②Then weigh 0.6g of thiourea (CN2H4S) and add it to the mixed solution obtained in step ①. Continue to apply magnetic force until it is completely dissolved to obtain the solution before the reaction.

[0037] ③ Transfer the pre-reaction solution obtained in step ② to a polytetrafluoroethylene hydrothermal reactor, seal it, and then transfer the reactor to a 200℃ vacuum oven for 24 hours. Open the reactor and pour out the upper yellow liquid to obtain a black precipitate. Place this precipitate in anhydrous ethanol solution and sonicate it. Wash it with deionized water and dry it in a 60℃ oven for 12 hours to obtain a black product.

[0038] ④ The black product obtained in step ③ is placed in a quartz boat and then placed in a vacuum tube furnace. It is sealed and protected with argon gas. It is then annealed at 800℃ for 2 hours and then naturally cooled to room temperature to obtain MoS2 material.

[0039] Taking the MoS2 material from Example 1 as an example, the X-ray diffraction pattern ( Figure 1The X-ray diffraction pattern of the layered MoS2 nanoflowers prepared by the method employed is completely consistent with the characteristic diffraction peaks of standard hexagonal MoS2 (JCPDS#37-1492). Diffraction peaks observed at 14.4°, 33.2°, 39.4°, and 58.7° correspond to the (002), (100), (103), and (110) crystal planes in the hexagonal MoS2 crystal structure, respectively. Based on the positions of these diffraction peaks and crystal plane indices, it is clear that the prepared nanosample possesses the structural characteristics of hexagonal MoS2. The X-ray diffraction pattern shows no impurity peaks, indicating that the prepared sample is of high purity and free of other impurities.

[0040] The specific surface area of ​​the prepared MoS2 was analyzed, such as... Figure 2 As shown. Figure 2 (a) shows the nitrogen adsorption-desorption isotherms. Under relative pressures of 0.1 to 0.9, the samples exhibit significant nitrogen adsorption and desorption rates, indicating a rich microporous structure. The specific surface area of ​​MoS2, 10.812 m², is clearly visible in the figure. 2 The pore size diagram shows an average pore size of approximately 13 nanometers. This phenomenon can be traced back to the aggregation of molybdenum disulfide during the hydrothermal reaction, which negatively impacts its specific surface area. For molybdenum disulfide anode materials, the relatively small specific surface area limits the effective contact between the electrolyte and the sample material, significantly affecting its electrochemical performance.

[0041] Figure 3 SEM and EDS images of MoS2 are presented. The SEM images clearly show the microstructure of the MoS2 nanoflowers synthesized via a hydrothermal method. These nanoflowers exhibit relatively uniform size, with each nanoflower having a diameter of approximately 0.5 to 1 μm. High-magnification SEM images reveal the aggregation effect between the nanoflowers, exhibiting a unique petal-like morphology that highlights their distinctive microscopic features. The EDS images clearly show the Mo and S elemental content ratios in the MoS2 samples.

[0042] Figure 4 TEM was used to analyze the morphology of the MoS2 samples in order to reveal the structure of the nanoflowers in greater depth. Figure 4 In (a), MoS2 appears as aggregated spherical morphology, consistent with SEM test results. Figure 4 (b) The interlayer spacing of MoS2 nanoflowers was observed to be 0.63 nm, matching that of standard molybdenum disulfide. TEM analysis not only revealed the microscopic features of the nanoflowers but also further verified their layered structure. Through structural characterization and analysis, a more comprehensive understanding of the morphological characteristics of MoS2 nanoflowers was achieved, providing an important reference for further research on the applications of MoS2 in different fields.

[0043] The MoS2 material prepared in Example 1 was used as the negative electrode material for a lithium-ion battery, and the preparation method of the lithium-ion battery was the same as the usual preparation method. The electrochemical performance of the prepared product was determined using a CR2016 button cell at 0.01–3.00 V using a NEWARE-BTS battery testing system. The electrochemical performance of the MoS2 nanosheet nanomaterial was determined using lithium metal as the counter electrode. The working electrode was prepared by spreading a slurry composed of active material, carbon black, and carboxymethyl cellulose in a weight ratio of 70:15:15. The mixed slurry was coated onto a clean copper foil using a doctor blade and then dried in a vacuum oven at 100°C for 12 h. The mass of active material in each working electrode disk with a diameter of 1.4 cm was calculated to be approximately 1.0–1.2 mg·cm³. -2 In an argon-filled glove box, dried electrodes were punched under a pressure of 4 MPa to prepare button cells. A solution of 1 M LiPF6 dissolved in ethylene carbonate / dimethyl carbonate (1:1 vol%) and 10% fluoroethylene carbonate was then used as the electrolyte. Pure lithium foil (1.3 mm thick, 1.6 cm in diameter) was used as the counter electrode, and the separator was Celgard 2300. The NEWARE-BTS battery tester was used at 0.1 mV·s. -1 At the cutoff voltage of 0.1 mV·s -1 The charge-discharge curves and cycle capability were determined at the cutoff voltage. Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry were performed using a CHI660E electrochemical workstation.

[0044] Taking the MoS2 material prepared in Example 1 as an example as a negative electrode material for lithium-ion batteries, such as... Figure 5 The cycling performance of the MoS2 electrode at 0.5 A / g was detected and analyzed by electrochemical impedance spectroscopy (EIS). A larger slope is more beneficial to the lithium-ion migration process. The test results show that the molybdenum disulfide electrode has relatively low charge transport resistance.

[0045] The battery was tested using cyclic voltammetry, with MoS2 as the anode material, to study its electrochemical reactions within a voltage range of 0.01–3.00 V. Cyclic voltammetry revealed the electrochemical reaction process and performance of MoS2 at different voltages. This method provides a comprehensive understanding of the battery performance and stability when MoS2 is used as the anode material. The scan rate used in the test was 0.1 mV / s, and three cycles were performed. The resulting CV curves are shown below. Figure 6 middle. Figure 6The results clearly demonstrate the significant redox peaks in the electrochemical reaction of the battery using MoS2 as the negative electrode material. The black line corresponding to the initial cycle shows two distinct reduction peaks in the observed CV curve, the first located at 1.0 V. These peaks represent the insertion of Li+ into the MoS2 lattice to form LiXMoS2. This phenomenon is closely related to the transformation of molybdenum disulfide from the 2H to the 1T crystal form. During the reaction, the MoS2 crystal structure evolves with the insertion of Li+, exhibiting different crystal states. The second significant reduction peak is located at 0.41 V. This peak can be explained by the insertion of Li+ into LiXMoS2 during the reaction, leading to the formation of Mo metal and LiS2. When lithium ions are inserted, the material undergoes a structural change, a process clearly visible on the CV curve. The CV curve of the initial oxidation process shows the first significant oxidation peak observed at 1.7 V, due to the localized oxidation of Mo. A second oxidation peak is observed at 2.3 V, representing the oxidation process of Li2S. The oxidation peak during the first cycle clearly demonstrates the oxidation reaction of Mo.

[0046] Figure 7 The first three charge and discharge cycles of a battery using MoS2 as the anode material are shown at a current density of 0.5 A / g. In the first cycle, distinct discharge plateaus are observed at 1.0 V and 0.55 V, compared to... Figure 6 The CV test results were consistent. In the first cycle, the battery exhibited high capacity performance, with a charge specific capacity of 830 mAh / g, a discharge specific capacity of 1180 mAh / g, and a coulombic efficiency of 70%. In the subsequent two cycles, the coulombic efficiency improved.

[0047] according to Figure 8 As shown, a battery using MoS2 as the negative electrode material underwent 200 cycles at a current density of 0.5 A / g. The results of the first three cycles have already... Figure 6 and Figure 7 Analysis was conducted. In subsequent cycles, the specific capacity decreased rapidly with increasing cycle number. However, after the first few cycles, the rate of capacity decay slowed significantly. Notably, after 50 cycles, the capacity stabilized at 260 mAh / g, and after 100 cycles, it remained at 250 mAh / g with almost no loss. After 200 cycles, it still maintained at 200 mAh / g. This indicates that the battery using MoS2 as the anode material exhibits excellent cycle stability and maintains stable capacity with increasing cycle number.

[0048] To further investigate the rate performance of batteries using MoS2 as the anode material, a series of charge-discharge cycle tests were conducted, covering different current density ranges (0.2-4 A / g). The experimental results are presented in... Figure 9 Ten consecutive tests were conducted, each at a different current density, before adjusting the current back to 0.2 A / g and repeating the tests ten more times. Data observation showed that the battery's specific capacity gradually decreased with changing current density. At the same current density, the specific capacity remained relatively stable throughout the ten consecutive cycles, exhibiting a certain consistency. Even at higher current densities (e.g., 4 A / g), the sample maintained a certain capacity level, and the specific capacity remained essentially unchanged after ten cycles. Notably, when the charge / discharge current was readjusted to 0.2 A / g, the capacity essentially returned to its initial level, clearly demonstrating the superior rate performance of the MoS2 nanoflower-based battery. This reflects the excellent quality and stability of batteries using MoS2 as the anode material and provides strong experimental evidence for its potential applications.

[0049] Example 2 - Preparation of MoS2 materials

[0050] ① Weigh 0.3g of sodium molybdate dihydrate (Na2MoO4·2H2O) using an electronic balance and add it to 40mL of 0.03M glucose solution. Stir magnetically until it is completely dissolved.

[0051] ②Then weigh 0.6g of thiourea (CN2H4S) and add it to the mixed solution obtained in step ①. Continue to apply magnetic force until it is completely dissolved to obtain the solution before the reaction.

[0052] ③ Transfer the pre-reaction solution obtained in step ② to a polytetrafluoroethylene hydrothermal reactor, seal it, and then transfer the reactor to a vacuum oven at 180°C for 12 hours. Open the reactor and pour out the upper yellow liquid to obtain a black precipitate. Place this precipitate in anhydrous ethanol solution and sonicate it. Wash it with deionized water and dry it in a 60°C oven for 12 hours to obtain a black product.

[0053] ④ The black product obtained in step ③ is placed in a quartz boat and then placed in a vacuum tube furnace. It is sealed and protected with argon gas. It is then annealed at 800℃ for 2 hours and then naturally cooled to room temperature to obtain MoS2 material.

[0054] Upon testing, the MoS2 material produced in Example 2 was found to be formed by stacking nanosheets.

[0055] Using the same NEWARE-BTS battery testing system as in Example 1, the MoS2 material in Example 2 was found to have a capacity of 168.6 mAh / g after 200 cycles at 0.5 A / g, demonstrating excellent cycle stability.

[0056] Example 3 - Preparation of MoS2 materials

[0057] ① Weigh 0.3g of sodium molybdate dihydrate (Na2MoO4·2H2O) using an electronic balance and add it to 40mL of 0.03M glucose solution. Stir magnetically until it is completely dissolved.

[0058] ②Then weigh 0.6g of thiourea (CN2H4S) and add it to the mixed solution obtained in step ①. Continue to apply magnetic force until it is completely dissolved to obtain the solution before the reaction.

[0059] ③ Transfer the pre-reaction solution obtained in step ② to a polytetrafluoroethylene hydrothermal reactor, seal it, and then transfer the reactor to a vacuum oven at 180°C for 24 hours. Open the reactor and pour out the upper yellow liquid to obtain a black precipitate. Place this precipitate in anhydrous ethanol solution and sonicate it. Wash it with deionized water and dry it in a 60°C oven for 12 hours to obtain a black product.

[0060] ④ The black product obtained in step ③ is placed in a quartz boat and then placed in a vacuum tube furnace. It is sealed and protected with argon gas. It is then annealed at 800℃ for 2 hours and then naturally cooled to room temperature to obtain MoS2 material.

[0061] Upon testing, the MoS2 material produced in Example 3 was found to be a uniformly shaped and evenly dispersed nanoflower structure formed by stacking nanosheets.

[0062] Using the same NEWARE-BTS battery testing system as in Example 1, the MoS2 material in Example 3 was found to have a capacity of 188.8 mAh / g after 200 cycles at 0.5 A / g, demonstrating excellent cycle stability.

[0063] Example 4 - Preparation of MoS2 materials

[0064] ① Weigh 0.3g of sodium molybdate dihydrate (Na2MoO4·2H2O) using an electronic balance and add it to 40mL of 0.03M glucose solution. Stir magnetically until it is completely dissolved.

[0065] ②Then weigh 0.6g of thiourea (CN2H4S) and add it to the mixed solution obtained in step ①. Continue to apply magnetic force until it is completely dissolved to obtain the solution before the reaction.

[0066] ③ Transfer the pre-reaction solution obtained in step ② to a polytetrafluoroethylene hydrothermal reactor, seal it, and then transfer the reactor to a vacuum oven at 180°C for 36 hours. Open the reactor and pour out the upper yellow liquid to obtain a black precipitate. Place this precipitate in anhydrous ethanol solution and sonicate it. Wash it with deionized water and dry it in a 60°C oven for 12 hours to obtain a black product.

[0067] ④ The black product obtained in step ③ is placed in a quartz boat and then placed in a vacuum tube furnace. It is sealed and protected with argon gas. It is then annealed at 800℃ for 2 hours and then naturally cooled to room temperature to obtain MoS2 material.

[0068] Upon testing, the MoS2 material produced in Example 4 was found to be a uniformly shaped and evenly dispersed nanoflower structure formed by stacking nanosheets.

[0069] Using the same NEWARE-BTS battery testing system as in Example 1, the MoS2 material in Example 4 was found to have a capacity of 190.4 mAh / g after 200 cycles at 0.5 A / g, demonstrating excellent cycle stability.

[0070] Example 5 - Preparation of MoS2 materials

[0071] ① Weigh 0.3g of sodium molybdate dihydrate (Na2MoO4·2H2O) using an electronic balance and add it to 40mL of 0.03M glucose solution. Stir magnetically until it is completely dissolved.

[0072] ②Then weigh 0.6g of thiourea (CN2H4S) and add it to the mixed solution obtained in step ①. Continue to apply magnetic force until it is completely dissolved to obtain the solution before the reaction.

[0073] ③ Transfer the pre-reaction solution obtained in step ② to a polytetrafluoroethylene hydrothermal reactor, seal it, and then transfer the reactor to a 200℃ vacuum oven for 12 hours. Open the reactor and pour out the upper yellow liquid to obtain a black precipitate. Place this precipitate in anhydrous ethanol solution and sonicate it. Wash it with deionized water and dry it in a 60℃ oven for 12 hours to obtain a black product.

[0074] ④ The black product obtained in step ③ is placed in a quartz boat and then placed in a vacuum tube furnace. It is sealed and protected with argon gas. It is then annealed at 800℃ for 2 hours and then naturally cooled to room temperature to obtain MoS2 material.

[0075] Upon testing, the MoS2 material produced in Example 5 was found to be formed by stacking nanosheets.

[0076] Using the same NEWARE-BTS battery testing system as in Example 1, the MoS2 material in Example 5 was found to have a capacity of 177.4 mAh / g after 200 cycles at 0.5 A / g, demonstrating excellent cycle stability.

[0077] Example 6 - Preparation of MoS2 materials

[0078] ① Weigh 0.3g of sodium molybdate dihydrate (Na2MoO4·2H2O) using an electronic balance and add it to 40mL of 0.03M glucose solution. Stir magnetically until it is completely dissolved.

[0079] ②Then weigh 0.6g of thiourea (CN2H4S) and add it to the mixed solution obtained in step ①. Continue to apply magnetic force until it is completely dissolved to obtain the solution before the reaction.

[0080] ③ Transfer the pre-reaction solution obtained in step ② to a polytetrafluoroethylene hydrothermal reactor, seal it, and then transfer the reactor to a 200℃ vacuum oven for 36 hours. Open the reactor and pour out the upper yellow liquid to obtain a black precipitate. Place this precipitate in anhydrous ethanol solution and sonicate it. Wash it with deionized water and dry it in a 60℃ oven for 12 hours to obtain a black product.

[0081] ④ The black product obtained in step ③ is placed in a quartz boat and then placed in a vacuum tube furnace. It is sealed and protected with argon gas. It is then annealed at 800℃ for 2 hours and then naturally cooled to room temperature to obtain MoS2 material.

[0082] Upon testing, the MoS2 material produced in Example 6 was found to be a uniformly shaped and evenly dispersed nanoflower structure formed by stacking nanosheets.

[0083] Using the same NEWARE-BTS battery testing system as in Example 1, the MoS2 material in Example 6 was found to have a capacity of 205.6 mAh / g after 200 cycles at 0.5 A / g, demonstrating excellent cycle stability.

[0084] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for preparing MoS2, a lithium-ion battery anode material, characterized in that, Includes the following steps: S1: Sodium molybdate dihydrate is added to glucose solution, dissolved, and then thiourea is added. Dissolution continues to obtain the solution before the reaction. The mass-volume ratio of sodium molybdate dihydrate, thiourea and glucose solution is 1g:2-3g:40-50mL. S2: Transfer the solution before reaction to a polytetrafluoroethylene hydrothermal reactor, seal it, and hydrothermally react at 180-200℃ for 12-36 hours to obtain a black precipitate. Sonicate, clean and dry the black precipitate to obtain a black product. S3: The black product was annealed and cooled in an inert gas atmosphere to obtain MoS2 material.

2. The method for preparing MoS2, a lithium battery anode material according to claim 1, is characterized in that, The concentration of the glucose solution is 0.02–0.04 M.

3. The method for preparing MoS2, a lithium battery anode material according to claim 1, is characterized in that, The mass-to-volume ratio of the sodium molybdate dihydrate, thiourea, and glucose solution is 1g:2-3g:40mL.

4. The method for preparing MoS2, a lithium battery anode material according to claim 1, is characterized in that, In step S2, the hydrothermal reaction temperature is 180–200℃ and the time is 12–24 h.

5. The method for preparing MoS2, a lithium battery anode material according to claim 1, is characterized in that, In step S2, the drying temperature is 60-80°C and the drying time is 12-24 hours.

6. The method for preparing MoS2, a lithium battery anode material according to claim 1, is characterized in that, In step S3, the annealing treatment is carried out at a temperature of 700–900°C for 1–4 hours.

7. The MoS2 material prepared by the preparation method according to any one of claims 1 to 6.

8. The application of the MoS2 material according to claim 7 in the preparation of lithium batteries.

9. The application according to claim 8, characterized in that, The application of the MoS2 material in the preparation of lithium battery anode materials.

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