Artificial solid-electrolyte interphase film based on MXene quantum dots and preparation method and application thereof

Abstract

This invention belongs to the field of electrochemical technology, specifically relating to an artificial solid electrolyte interface film based on MXene quantum dots, its preparation method, and its application. The invention first uses concentrated hydrochloric acid to etch the MAX phase to obtain MXene nanosheets, then uses a hydrothermal or ultrasonic treatment method assisted by freeze-drying to obtain MXene quantum dots. After mixing the MXene quantum dots with a binder and solvent, the mixture is coated and the solvent is evaporated to obtain the artificial solid electrolyte interface film based on MXene quantum dots. The reason for using MXene quantum dots as the artificial solid electrolyte interface film in this invention is that the surface of MXene quantum dots contains a large number of lithiophilic groups, which can act as seed sites to induce a uniform lithium deposition process, thereby effectively inhibiting lithium dendrite growth and improving the coulombic efficiency of lithium metal batteries.

Description

Technical Field

[0001] This invention belongs to the field of electrochemical technology, specifically relating to artificial solid electrolyte interface membranes based on MXene quantum dots, their preparation methods, and applications. Background Technology

[0002] Lithium metal is known for its extremely high theoretical specific capacity (3860 mAh g). -1 With its advantages of low standard electrode potential (-3.04V vs. SHE), lithium metal is considered one of the most promising next-generation high-energy-density battery anodes. However, during lithium metal charging and discharging, uneven lithium deposition / stripping processes lead to the formation of numerous lithium dendrites at the anode solidification interface. The formation of lithium dendrites not only increases the contact area between the lithium electrode and the electrolyte, accelerating electrolyte consumption, but also creates a large amount of unusable "dead lithium," causing passivation of the anode interface. More seriously, when lithium dendrites grow to a certain extent, the sharp dendritic dendrites can pierce the separator, causing the two electrodes to contact, resulting in an internal short circuit, battery failure, or safety hazards.

[0003] To address the challenge of lithium dendrite growth, numerous solutions have been reported. These mainly include the design of uniform porous membranes, the construction of three-dimensional current collectors, functional electrolyte additives, and the design of artificial SEI films. Although these solutions have made some progress in suppressing lithium dendrite growth, finding a simple and effective method to solve the problem remains a significant challenge.

[0004] Traditional electrochemically generated intrinsic SEI films (artificial solid electrolyte interphase films) suffer from low mechanical strength and poor flexibility, leading to their breakage during repeated charge-discharge cycles. In contrast, artificial SEI films offer significant advantages in terms of selectable protective layer components and controllable reaction conditions. Therefore, the construction of artificial SEI films holds great promise for practical applications in lithium metal batteries. However, artificial SEI films constructed using common inorganic materials still cannot effectively solve the SEI film breakage problem, ultimately resulting in negative electrode volume expansion. Summary of the Invention

[0005] To address the shortcomings of the existing technologies, the present invention aims to provide an artificial solid electrolyte interface film based on MXene quantum dots, its preparation method, and its applications. This invention uses MXene quantum dots as raw materials, which are mixed with a binder and solvent, and then coated to obtain the artificial solid electrolyte interface film. The artificial solid electrolyte interface film obtained by the method of this invention effectively controls the growth of lithium dendrites in secondary batteries, solves the problems of volume expansion of the lithium anode and SEI film breakage during cycling, improves the safety of secondary batteries, and extends the cycle life of secondary batteries.

[0006] This invention is achieved through the following technical solution:

[0007] The method for preparing artificial solid electrolyte interface films based on MXene quantum dots includes the following steps:

[0008] The MAX phase material was etched and then washed with water until neutral to obtain MXene nanosheets;

[0009] MXene nanosheets were dissolved in water to obtain an aqueous solution of MXene nanosheets. The pH of the aqueous solution of MXene nanosheets was adjusted to 9.0-10.0, and then a hydrothermal reaction was carried out to obtain an aqueous solution of MXene quantum dots.

[0010] or,

[0011] An aqueous solution of MXene nanosheets was ultrasonically treated to obtain an aqueous solution of MXene quantum dots.

[0012] After dispersing MXene quantum dots and binders in a solvent, a slurry is obtained. The slurry is coated and the solvent is evaporated to obtain an artificial solid electrolyte interface membrane based on MXene quantum dots. This invention uses MXene quantum dots as raw materials to obtain an artificial solid electrolyte interface membrane.

[0013] Preferably, the amount of MXene nanosheets in the aqueous solution is 0.16 mg / mL to 1.6 mg / mL.

[0014] Preferably, the etching solution is 6 mol / L concentrated hydrochloric acid, and the etching is carried out at 35°C for 24 hours.

[0015] Preferably, the pH of the MXene nanosheet aqueous solution is adjusted using ammonia.

[0016] Preferably, the MAX phase material is selected from Ti3C2T x Ti2CT x V2CT x Mo2CT x Nb2CT x One of them.

[0017] Preferably, the hydrothermal reaction conditions are: hydrothermal reaction at 100-110℃ for 6 hours.

[0018] Preferably, the ultrasonic treatment time is 72-150 hours until the MXene nanosheets are broken down to obtain MXene quantum dots.

[0019] Preferably, the mass ratio of MXene quantum dots to binder is 1:9-9:1. The binder only plays a bonding role, so the amount of binder is sufficient to achieve MXene quantum dot film formation.

[0020] Preferably, the binder is selected from at least one of vinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyacrylic acid (PAA), sodium alginate (SA), polymethyl methacrylate (PMMA), sodium carboxymethyl cellulose (CMC), or styrene-butadiene latex (also known as polystyrene-butadiene copolymer) (SBR). Further, the binder is selected from polyacrylic acid (PAA) or polyvinylidene fluoride (PVDF).

[0021] Preferably, the solvent is selected from at least one of tetrahydrofuran (THF), N-methylpyrrolidone (NMP), 1,4-dioxane (DOL), and dimethyl glycol ether (DME).

[0022] This invention also protects the artificial solid electrolyte interface membrane based on MXene quantum dots prepared by the above preparation method.

[0023] This invention also protects the application of MXene quantum dot-based artificial solid electrolyte interface films in the preparation of lithium anode materials.

[0024] Preferably, the application method is as follows: the slurry is coated on the surface of the lithium sheet, and after the solvent is evaporated, the lithium anode material is obtained.

[0025] Preferably, the loading of MXene quantum dots on the lithium sheet is 0.3-1.0 mg / cm³. 2 If the MXene quantum dot loading is less than 0.3 mg / cm³ -2 If the MXene quantum dot loading is greater than 1.0 mg / cm³, it cannot effectively coat the lithium sheet surface; -2 This will result in an excessively thick interfacial film, affecting ion transport.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. This invention uses MAX phase materials as raw materials to prepare MXene quantum dots, and then uses MXene quantum dots as raw materials to obtain an artificial solid electrolyte interface film under the bonding effect of a binder. Compared with existing methods for solving lithium dendrite growth, this invention uses MXene quantum dots to obtain an artificial solid electrolyte interface film. The preparation method of the artificial solid electrolyte interface film is simple and solves the problems of lithium dendrite growth, volume expansion of the lithium anode during cycling, and SEI film breakage.

[0028] 2. The artificial solid electrolyte interface membrane obtained by the method of the present invention uses MXene quantum dots as raw material for the first time. The quantized MXene material has abundant end-group lithium-loving groups, while avoiding the stacking and aggregation effects between nanosheets. This makes the integrated artificial solid electrolyte interface membrane have a good regulatory effect on lithium deposition. It can not only effectively reduce the lithium nucleation overpotential and inhibit the growth of lithium dendrites, but also effectively solve the problem of artificial solid electrolyte interface membrane breakage.

[0029] The reasons for the breakage of artificial solid electrolyte interphase (ASE) membranes are as follows: 1. ASE membranes based on MXene quantum dots can effectively alleviate the expansion problem of lithium metal at the negative electrode, and the lithium deposition process first occurs on the ASE membrane; 2. ASE membranes based on MXene quantum dots have super-electrolyte affinity, which is conducive to the diffusion of lithium ions on the membrane surface and avoids the aggregation of lithium ions on the negative electrode surface, thus preventing the formation of a peak aggregation effect; 3. ASE membranes based on MXene quantum dots have good adhesion to the lithium metal surface, which greatly improves the stability of the ASE membrane.

[0030] In addition, the MXene quantum dots introduced in this invention contain a large number of lithiophilic groups on their surface, which can serve as seed sites to induce a uniform lithium deposition process, thereby effectively suppressing lithium dendrite growth and improving the coulombic efficiency of lithium metal batteries.

[0031] 3. Compared with existing intrinsic SEI films, the present invention directly mixes MXene quantum dots with a binder and then coats them. The resulting artificial solid electrolyte interface film based on MXene quantum dots is not only structurally stable under the action of the binder, but also has good flexibility and high mechanical strength, overcoming the problems of low mechanical strength and poor flexibility of intrinsic SEI films generated by electrochemical methods in the prior art. Attached Figure Description

[0032] Figure 1 This is a field emission high-resolution transmission electron micrograph of the MXene quantum dots in Example 1.

[0033] Figure 2 This is an optical image of the interface of the lithium anode material obtained using the artificial solid electrolyte interface film based on MXene quantum dots in Example 1.

[0034] Figure 3 Coulombic efficiency plots for bare Li-Cu batteries and MQDs@Li-Cu batteries assembled using lithium anode materials obtained from the artificial solid electrolyte interface film based on MXene quantum dots in Example 1.

[0035] Figure 4Voltage-time plots for bare Li / / Li batteries and MQDs@Li / / MQDs@Li batteries assembled using the lithium anode material obtained from the artificial solid electrolyte interface film based on MXene quantum dots in Example 1.

[0036] Figure 5 The rate performance diagram shows the LiFePO4 / / MQDs@Li battery assembled using the lithium anode material obtained in Example 1 based on the artificial solid electrolyte interface film of MXene quantum dots. Detailed Implementation

[0037] The specific embodiments of the present invention are described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. Unless otherwise specified, the experimental methods described in the embodiments of the present invention are conventional methods.

[0038] Considering that existing technologies using traditional inorganic materials to construct artificial SEI films cannot effectively solve the problem of SEI film breakage, this invention starts with the selection of inorganic materials and, for the first time, uses MXene quantum dots as the raw material for SEI films. After mixing MXene quantum dots with a binder and coating them, it was found that the obtained artificial solid electrolyte interface film not only effectively controls the growth of lithium dendrites in secondary batteries, but also solves the problems of volume expansion of lithium anodes and SEI film breakage during cycling.

[0039] The present invention will be studied using the following embodiments, and the specific research methods and results are shown below:

[0040] Example 1

[0041] The method for preparing artificial solid electrolyte interface films based on MXene quantum dots includes the following steps:

[0042] (1) Ti3AlC2MAX phase powder was etched by acid etching to obtain Ti3C2T x MXene aqueous solution with a concentration of 5 mg / mL -1 .

[0043] (2) Take 8 mL of Ti3C2T x MXene aqueous solution was prepared by adding 72 mL of water, then adding ammonia and adjusting the pH to 9.0. The solution was then placed in a reaction vessel and hydrothermally reacted at 100°C for 6 hours. The MXene quantum dots were then collected by filtration and freeze-drying.

[0044] (3) Weigh 0.016g of Ti3C2T from step (2). xMXene quantum dots were mixed with 0.004 g of PVDF and thoroughly ground. The mixture was then dispersed in 600 μL of NMP in a glove box and sonicated for 12 h to obtain a slurry. The slurry was coated and dried at room temperature for 10 min, and then dried at 60 °C for 24 h to obtain an artificial solid electrolyte interface membrane based on MXene quantum dots.

[0045] The preparation method of lithium anode includes the following steps:

[0046] An artificial solid electrolyte interface membrane based on MXene quantum dots was loaded onto a substrate with an area of ​​1 cm². 2 On the surface of the lithium sheet, a lithium anode is obtained.

[0047] Example 2

[0048] The method for preparing artificial solid electrolyte interface films based on MXene quantum dots includes the following steps:

[0049] (1) Ti3C2T was obtained by etching Ti3AlC2MAX phase powder with acid etching method. x MXene aqueous solution with a concentration of 5 mg / mL -1 .

[0050] (2) Take 8 mL of the above Ti3C2T x MXene aqueous solution was prepared by adding 72 mL of water and adding an appropriate amount of ammonia to adjust the pH of the solution to 9. The solution was placed in a reaction vessel and reacted at 100 °C for 6 h. The quantum dot samples were then collected by filtration and freeze-drying.

[0051] (3) Weigh 0.016g of the Ti3C2T obtained in step (2). x MXene quantum dots and 0.004 g of PVDF were thoroughly ground and dispersed in a glove box into a mixed solution of 300 μL of NMP and 300 μL of THF. The mixture was then sonicated for 12 h to obtain a slurry. The slurry was coated and dried at room temperature for 10 min, and then dried at 60 °C for 24 h to obtain an artificial solid electrolyte interface membrane based on MXene quantum dots.

[0052] The preparation method of lithium anode includes the following steps:

[0053] An artificial solid electrolyte interface membrane based on MXene quantum dots was loaded onto a substrate with an area of ​​1 cm². 2 On the surface of the lithium sheet, a lithium anode is obtained.

[0054] Example 3

[0055] The method for preparing artificial solid electrolyte interface films based on MXene quantum dots includes the following steps:

[0056] (1) Ti3C2T was obtained by etching Ti3AlC2MAX phase powder with acid etching method. x MXene aqueous solution with a concentration of 5 mg / mL -1 .

[0057] (2) Take 8 mL of the above Ti3C2T x MXene aqueous solution was prepared by adding 72 mL of water and adding an appropriate amount of ammonia to adjust the pH of the solution to 9. The solution was placed in a reaction vessel and reacted at 100 °C for 6 h. The quantum dot samples were then collected by filtration and freeze-drying.

[0058] (3) Weigh 0.016g of the Ti3C2T obtained in step (2). x MXene quantum dots and 0.004 g of PVDF were thoroughly ground and dispersed in a glove box into a mixed solution of 300 μL of DOL and 300 μL of DME. The mixture was then sonicated for 12 h to obtain a slurry. The slurry was coated and dried at room temperature for 10 min, and then dried at 60 °C for 24 h to obtain an artificial solid electrolyte interface membrane based on MXene quantum dots.

[0059] The preparation method of lithium anode includes the following steps:

[0060] An artificial solid electrolyte interface membrane based on MXene quantum dots was loaded onto a substrate with an area of ​​1 cm². 2 On the surface of the lithium sheet, a lithium anode is obtained.

[0061] Example 4

[0062] The method for preparing artificial solid electrolyte interface films based on MXene quantum dots includes the following steps:

[0063] (1) Ti3C2T was obtained by etching Ti3AlC2MAX phase powder with acid etching method. x MXene aqueous solution with a concentration of 5 mg / mL -1 .

[0064] (2) Take 8 mL of the above Ti3C2T x MXene aqueous solution was prepared by adding 72 mL of water and adding an appropriate amount of ammonia to adjust the pH of the solution to 10. The solution was placed in a reaction vessel and reacted at 110 °C for 6 h. The quantum dot samples were then collected by filtration and freeze-drying.

[0065] (3) Weigh 0.016g of the Ti3C2T obtained in step (2). xMXene quantum dots and 0.004 g of PVDF were thoroughly ground and dispersed in 600 μL of NMP solution in a glove box for ultrasonic treatment for 12 h to obtain a slurry. The slurry was coated and dried at room temperature for 10 min, and then dried at 60 °C for 24 h to obtain an artificial solid electrolyte interface membrane based on MXene quantum dots.

[0066] The preparation method of lithium anode includes the following steps:

[0067] An artificial solid electrolyte interface membrane based on MXene quantum dots was loaded onto a substrate with an area of ​​1 cm². 2 On the surface of the lithium sheet, a lithium anode is obtained.

[0068] Example 5

[0069] The method for preparing artificial solid electrolyte interface films based on MXene quantum dots includes the following steps:

[0070] (1) Ti3C2T was obtained by etching Ti3AlC2MAX phase powder with acid etching method. x MXene aqueous solution with a concentration of 5 mg / mL -1 .

[0071] (2) Take 8 mL of the above Ti3C2T x MXene aqueous solution was prepared by adding 72 mL of water to it and sonicating it at room temperature for 72 h. The MXene quantum dot sample was then collected by filtration and freeze-drying.

[0072] (3) Weigh 0.016g of the Ti3C2T obtained in step (2). x MXene quantum dots and 0.004 g of PVDF were thoroughly ground and dispersed in 600 μL of NMP solution in a glove box for ultrasonic treatment for 12 h to obtain a slurry. The slurry was coated and dried at room temperature for 10 min, and then dried at 60 °C for 24 h to obtain an artificial solid electrolyte interface membrane based on MXene quantum dots.

[0073] The preparation method of lithium anode includes the following steps:

[0074] An artificial solid electrolyte interface membrane based on MXene quantum dots was loaded onto a substrate with an area of ​​1 cm². 2 On the surface of the lithium sheet, a lithium anode is obtained.

[0075] Example 6

[0076] The method for preparing artificial solid electrolyte interface films based on MXene quantum dots includes the following steps:

[0077] (1) Ti3C2T was obtained by etching Ti3AlC2MAX phase powder with acid etching method.x MXene aqueous solution with a concentration of 5 mg / mL -1 .

[0078] (2) Take 8 mL of the above Ti3C2T x MXene aqueous solution was prepared by adding 72 mL of water to it and sonicating it at room temperature for 72 h. The MXene quantum dot sample was then collected by filtration and freeze-drying.

[0079] (3) Weigh 0.016g of the Ti3C2T obtained in step (2). x MXene quantum dots and 0.004 g of PVDF were thoroughly ground and dispersed in a glove box into a mixed solution of 300 μL of NMP and 300 μL of THF. The mixture was then sonicated for 12 h to obtain a slurry. The slurry was coated and dried at room temperature for 10 min, and then dried at 60 °C for 24 h to obtain an artificial solid electrolyte interface membrane based on MXene quantum dots.

[0080] The preparation method of lithium anode includes the following steps:

[0081] An artificial solid electrolyte interface membrane based on MXene quantum dots was loaded onto a substrate with an area of ​​1 cm². 2 On the surface of the lithium sheet, a lithium anode is obtained.

[0082] Example 7

[0083] The method for preparing artificial solid electrolyte interface films based on MXene quantum dots includes the following steps:

[0084] (1) Ti3C2T was obtained by etching Ti3AlC2MAX phase powder with acid etching method. x MXene aqueous solution with a concentration of 5 mg / mL -1 .

[0085] (2) Take 8 mL of the above Ti3C2T x MXene aqueous solution was prepared by adding 72 mL of water to it and sonicating it at room temperature for 72 h. The MXene quantum dot sample was then collected by filtration and freeze-drying.

[0086] (3) Weigh 0.016g of the Ti3C2T obtained in step (2). x MXene quantum dots and 0.004 g of PVDF were thoroughly ground and dispersed in a glove box into a mixed solution of 300 μL of DOL and 300 μL of DME. The mixture was then sonicated for 12 h to obtain a slurry. The slurry was coated and dried at room temperature for 10 min, and then dried at 60 °C for 24 h to obtain an artificial solid electrolyte interface membrane based on MXene quantum dots.

[0087] The preparation method of lithium anode includes the following steps:

[0088] An artificial solid electrolyte interface membrane based on MXene quantum dots was loaded onto a substrate with an area of ​​1 cm². 2 On the surface of the lithium sheet, a lithium anode is obtained.

[0089] Example 8

[0090] The method for preparing artificial solid electrolyte interface films based on MXene quantum dots includes the following steps:

[0091] (1) Ti3C2T was obtained by etching Ti3AlC2MAX phase powder with acid etching method. x MXene aqueous solution with a concentration of 5 mg / mL -1 .

[0092] (2) Take 8 mL of the above Ti3C2T x MXene aqueous solution was prepared by adding 72 mL of water and sonicating at room temperature for 150 h. The MXene quantum dot sample was then collected by filtration and freeze-drying.

[0093] (3) Weigh 0.016g of the Ti3C2T obtained in step (2). x MXene quantum dots and 0.004 g of PVDF were thoroughly ground and dispersed in 600 μL of NMP solution in a glove box for ultrasonic treatment for 12 h to obtain a slurry. The slurry was coated and dried at room temperature for 10 min, and then dried at 60 °C for 24 h to obtain an artificial solid electrolyte interface membrane based on MXene quantum dots.

[0094] The preparation method of lithium anode includes the following steps:

[0095] An artificial solid electrolyte interface membrane based on MXene quantum dots was loaded onto a substrate with an area of ​​1 cm². 2 On the surface of the lithium sheet, a lithium anode is obtained.

[0096] Examples 1-8 of this invention all yielded artificial solid electrolyte interface films based on MXene quantum dots that solved the problems of volume expansion and SEI film breakage of lithium anodes during cycling. The following research uses the lithium anode and the artificial solid electrolyte interface film based on MXene quantum dots from Example 1 as examples. Specific research methods and results are shown below:

[0097] Figure 1 The results show that the prepared MXene quantum dots have uniform size, and the statistical results show that the average particle size of the MXene quantum dots is 2.75 nm.

[0098] Figure 2The results show that the surface of the lithium anode material obtained by using the artificial solid electrolyte interface film based on MXene quantum dots in Example 1 is basically flat, which helps to avoid the aggregation effect of lithium ions.

[0099] The lithium anode material (MQDs@Li) obtained from the artificial solid electrolyte interface film based on MXene quantum dots in Example 1 was used to assemble MQDs@Li-Cu batteries, MQDs@Li / / MQDs@Li batteries, and LiFePO4 / / MQDs@Li batteries. All batteries were assembled in an argon-filled glove box (water and oxygen levels were both less than 0.01 ppm) to obtain standard CR2032 button cells.

[0100] The separators used in assembling the batteries are all commercial Celgard 2325 separators. For LiFeO4 / / MQDs@Li batteries, pure lithium or MQDs@Li is used as the negative electrode. The positive electrode is prepared by mixing active material LiFePO4, conductive carbon black and PVDF in a mass ratio of 8:1:1, grinding them in an N-methylpyrrolidone solution and then coating them onto carbon-coated aluminum foil.

[0101] For MQDs@Li batteries, pure lithium foil is used as the positive electrode and MQDs@Li is used as the negative electrode.

[0102] For MQDs@Li-Cu batteries, copper sheet is used as the positive electrode and MQDs@Li is used as the negative electrode.

[0103] Figure 3 The results show that at 0.5 mA / cm 2 At the specified current density, after 150 lithium deposition / stripping cycles, the coulombic efficiency of the MQDs@Li-Cu battery was 97.86%. Conversely, the coulombic efficiency of the Li-Cu battery dropped significantly after 53 cycles, and subsequently failed completely after 78 cycles.

[0104] Figure 4 The results show that the MQDs@Li / / MQDs@Li battery achieves a speed of 1 mA / cm². 2 The Li / / Li battery can cycle stably at a current density of up to 1400 hours, with a final overpotential of only 19.9 mV. In contrast, the Li / / Li battery showed a significant voltage increase after 700 hours of cycling, indicating severe lithium dendrite growth inside the Li / / Li battery.

[0105] Figure 5The results show that the LiFeO4 / / MQDs@Li battery assembled with LiFePO4 as the cathode and MQDs@Li exhibits excellent rate performance. Its initial discharge specific capacity at 0.2C reaches 163.05 mAh / g, and its capacity at 10C is 82.64 mAh / g. Even when the current density returns to 0.2C, it still exhibits a discharge specific capacity of 159.23 mAh / g, and the capacity retention rate is 95.12% after 150 cycles. This fully demonstrates the practicality of MQDs@Li.

[0106] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, it is intended to include any modifications and variations that fall within the scope of the claims and their equivalents.

Claims

1. A method for preparing an artificial solid electrolyte interface film based on MXene quantum dots, characterized in that, Includes the following steps: MXene quantum dots were prepared using MAX phase materials as raw materials; After dispersing MXene quantum dots and binders in a solvent, a slurry is obtained. The slurry is coated on the surface of a lithium sheet and the solvent is evaporated to obtain an artificial solid electrolyte interface film based on MXene quantum dots on the surface of the lithium sheet.

2. The method for preparing an artificial solid electrolyte interface film based on MXene quantum dots according to claim 1, characterized in that, The mass ratio of MXene quantum dots to binder is 1:9-9:

1.

3. The method for preparing an artificial solid electrolyte interface film based on MXene quantum dots according to claim 1, characterized in that, The adhesive is selected from at least one of vinylidene fluoride-hexafluoropropylene copolymer, polyvinylidene fluoride, polytetrafluoroethylene, polyacrylic acid, sodium alginate, polymethyl methacrylate, sodium carboxymethyl cellulose, or styrene-butadiene latex.

4. The method for preparing an artificial solid electrolyte interface film based on MXene quantum dots according to claim 1, characterized in that, The solvent is selected from at least one of tetrahydrofuran, N-methylpyrrolidone, 1,4-dioxane or ethylene glycol dimethyl ether.

5. The method for preparing an artificial solid electrolyte interface film based on MXene quantum dots according to claim 1, characterized in that, MXene quantum dots are prepared according to the following steps: The MAX phase material was etched and then washed with water until neutral to obtain MXene nanosheets; MXene nanosheets were dissolved in water to obtain an aqueous solution of MXene nanosheets. The pH of the aqueous solution of MXene nanosheets was adjusted to 9.0-10.0, and then a hydrothermal reaction was carried out to obtain an aqueous solution of MXene quantum dots. The water was evaporated to obtain MXene quantum dots.

6. The method for preparing an artificial solid electrolyte interface film based on MXene quantum dots according to claim 1, characterized in that, MXene quantum dots are prepared according to the following steps: The MAX phase material was etched and then washed with water until neutral to obtain MXene nanosheets; MXene nanosheets were dissolved in water to obtain an aqueous solution of MXene nanosheets. The aqueous solution of MXene nanosheets was then sonicated to obtain an aqueous solution of MXene quantum dots. The water was then evaporated to obtain MXene quantum dots.

7. An artificial solid electrolyte interface membrane based on MXene quantum dots prepared by the preparation method of claim 1.

8. The application of the MXene quantum dot-based artificial solid electrolyte interface membrane as described in claim 7 in the preparation of lithium anode materials.

9. The application of the MXene quantum dot-based artificial solid electrolyte interface film according to claim 8 in the preparation of lithium anode materials, characterized in that, The application method is as follows: The slurry is coated onto the surface of a lithium sheet, and after the solvent is evaporated, a lithium anode material is obtained.

10. The application of the MXene quantum dot-based artificial solid electrolyte interface film according to claim 9 in the preparation of lithium anode materials, characterized in that, The loading amount of MXene quantum dots on the lithium sheet is 0.3-1.0 mg / cm 2 .

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