CN119542362A - Artificial solid electrolyte interface film based on MXene quantum dots and preparation method and application thereof - Google Patents
Artificial solid electrolyte interface film based on MXene quantum dots and preparation method and application thereof Download PDFInfo
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Abstract
本发明属于电化学技术领域，具体涉及基于MXene量子点的人工固体电解质界面膜及其制备方法和应用，本发明先用浓盐酸刻蚀MAX相得到MXene纳米片，再采用水热法或超声处理法辅助以冷冻干燥得到MXene量子点，将MXene量子点与粘结剂和溶剂混合后，经涂覆和蒸发溶剂，得到基于MXene量子点的人工固体电解质界面膜。本发明采用MXene量子点为人工固体电解质界面膜的原因是：MXene量子点表面含有大量的亲锂基团，能够作为种子位点诱导均匀的锂沉积过程，从而有效抑制锂枝晶生长，并提高锂金属电池库伦效率。
The present invention belongs to the field of electrochemical technology, and specifically relates to an artificial solid electrolyte interface membrane based on MXene quantum dots, and a preparation method and application thereof. The present invention first uses concentrated hydrochloric acid to etch the MAX phase to obtain MXene nanosheets, and then uses a hydrothermal method or an ultrasonic treatment method to assist freeze drying to obtain MXene quantum dots. After the MXene quantum dots are mixed with a binder and a solvent, the solvent is coated and evaporated to obtain an artificial solid electrolyte interface membrane based on MXene quantum dots. The reason why the present invention uses MXene quantum dots as the artificial solid electrolyte interface membrane is that the surface of the MXene quantum dots contains a large number of lithium-philic groups, which can act as seed sites to induce a uniform lithium deposition process, thereby effectively inhibiting the growth of lithium dendrites and improving the coulombic efficiency of lithium metal batteries.
Description
Technical Field
The invention belongs to the technical field of electrochemistry, and particularly relates to an artificial solid electrolyte interface film based on MXene quantum dots, and a preparation method and application thereof.
Background
Metallic lithium is considered one of the most promising negative electrodes of next generation high energy density batteries, with its ultrahigh theoretical specific capacity (3830 mAh g -1) and lowest standard electrode potential (-3.04 v vs. However, in the process of charging and discharging lithium metal, a large amount of lithium dendrites are formed on the solidification interface of the negative electrode in the non-uniform lithium deposition/stripping process, so that the contact area between a lithium electrode and electrolyte is increased, the consumption of the electrolyte is accelerated, and a large amount of dead lithium which cannot be reused is formed, so that the passivation of the negative electrode interface is caused. More seriously, when lithium dendrites grow to a certain extent, the sharp dendrites can pierce the separator to bring the two electrodes into contact, causing internal short circuit of the battery, causing malfunction of the battery or causing safety hazard.
In order to solve the problem of lithium dendrite growth, many solutions have been reported. Mainly comprises a uniform pore structure diaphragm design, a three-dimensional current collector construction, a functional electrolyte additive and an artificial SEI film design, and although the scheme has made a certain progress in inhibiting the growth of lithium dendrites, the solution of the problems is still faced with serious laboratory in a simple and effective method.
The conventional electrochemically generated intrinsic SEI film (artificial solid electrolyte interface film) has problems of low mechanical strength and poor flexibility, thus causing breakage of the SEI film during repeated charge and discharge. Compared with the intrinsic SEI film, the construction of the artificial SEI film has the great advantages of optional protective layer components and controllable reaction conditions, so that the construction of the artificial SEI film has great potential in practical application of lithium metal batteries, and the problem of SEI film breakage cannot be well solved by the artificial SEI film constructed by common inorganic materials, and finally, the volume expansion of a negative electrode is also caused.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an artificial solid electrolyte interface film based on MXene quantum dots, and a preparation method and application thereof. The artificial solid electrolyte interface film obtained by the method effectively controls the growth of lithium dendrites in the secondary battery, solves the problems of volume expansion and SEI film breakage of a lithium negative electrode in the circulating process, improves the safety of the secondary battery, and prolongs the circulating service life of the secondary battery.
The invention is realized by the following technical scheme:
the preparation method of the artificial solid electrolyte interface film based on the MXene quantum dots comprises the following steps:
Etching the MAX phase material, and then washing to neutrality to obtain an MXene nano-sheet;
dissolving an MXene nano-sheet in water to obtain an MXene nano-sheet aqueous solution, regulating the pH of the MXene nano-sheet aqueous solution to 9.0-10.0, and then performing hydrothermal reaction to obtain an MXene quantum dot aqueous solution;
Or alternatively
Ultrasonic processing is carried out on the MXene nano-sheet aqueous solution to obtain an MXene quantum dot aqueous solution;
dispersing the MXene quantum dots and the binder in a solvent to obtain slurry, coating the slurry, and evaporating the solvent to obtain the artificial solid electrolyte interface film based on the MXene quantum dots.
Preferably, in the aqueous solution of the MXene nano-sheets, the amount of the MXene nano-sheets is 0.16mg/mL-1.6mg/mL.
Preferably, the etching liquid is concentrated hydrochloric acid with the concentration of 6mol/L, and the etching is carried out for 24 hours at the temperature of 35 ℃.
Preferably, the aqueous solution of the MXene nanoplatelets is pH adjusted using aqueous ammonia.
Preferably, the MAX phase material is selected from one of Ti3C2Tx、Ti2CTx、V2CTx、Mo2CTx、Nb2CTx.
Preferably, the hydrothermal reaction conditions are such that the hydrothermal reaction is carried out at 100-110 ℃ for 6 hours.
Preferably, the ultrasonic treatment is carried out for 72-150 hours until the MXene nano-sheets are broken up until the MXene quantum dots are obtained.
Preferably, the mass ratio of the MXene quantum dots to the binder is 1:9-9:1, and the binder only plays a role in binding, so that the amount of the binder can realize the film formation of the MXene quantum dots.
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 called polystyrene butadiene copolymer) (SBR). Further, the binder is selected from polyacrylic acid (PAA) or polyvinylidene fluoride (PVDF).
Preferably, the solvent is at least one selected from Tetrahydrofuran (THF), N-methylpyrrolidone (NMP), 1, 4-Dioxane (DOL), ethylene glycol dimethyl ether (DME).
The invention also protects the artificial solid electrolyte interface film based on the MXene quantum dots prepared by the preparation method.
The invention also protects the application of the artificial solid electrolyte interface film based on the MXene quantum dots in preparing lithium anode materials.
Preferably, the application method comprises the steps of coating the slurry on the surface of a lithium sheet, and evaporating the solvent to obtain the lithium anode material.
Preferably, the loading of the MXene quantum dots on the lithium sheet is 0.3-1.0mg/cm 2. If the MXene quantum dot loading is less than 0.3mg/cm -2, the lithium sheet surface cannot be effectively coated, and if the MXene quantum dot loading is greater than 1.0mg/cm -2, the interface film is too thick, and ion transmission is affected.
Compared with the prior art, the invention has the following beneficial effects:
1. The invention takes MAX phase material as raw material, prepares and obtains MXene quantum dots, and then takes MXene quantum dots as raw material, and obtains the artificial solid electrolyte interface film under the bonding action of the adhesive. Compared with the method for solving the problem of lithium dendrite growth in the prior art, the method for preparing the artificial solid electrolyte interface film by adopting the MXene quantum dots is simple and convenient, and solves the problems of lithium dendrite growth, volume expansion of a lithium anode in a circulating process and SEI film breakage.
2. In the artificial solid electrolyte interface film obtained by the method, MXene quantum dots are used as raw materials for the first time, the quantized MXene material has rich end group lithium-philic groups, and meanwhile, stacking and agglomeration effects among nano sheets are avoided, so that the integrated artificial solid electrolyte interface film has a good regulation and control effect on lithium deposition, the lithium nucleation overpotential can be effectively reduced, the growth of lithium dendrites is inhibited, and the problem of crushing the artificial solid electrolyte interface film can be well solved.
The method solves the problem of breaking the artificial solid electrolyte interface film, and comprises the steps that 1, the artificial solid electrolyte interface film based on the MXene quantum dots can effectively relieve the expansion problem of lithium metal of a negative electrode, the lithium deposition process firstly occurs on the artificial solid electrolyte film, 2, the artificial solid electrolyte interface film based on the MXene quantum dots has super-hydrophilic electrolyte, is favorable for diffusion of lithium ions on the surface of the film and avoids binding and aggregation of the lithium ions on the surface of the negative electrode, so that a tip aggregation effect is generated, and 3, the artificial solid electrolyte interface film based on the MXene quantum dots has good adhesion on the surface of the lithium metal, so that the stability of the artificial solid electrolyte interface film is greatly improved.
In addition, the surface of the MXene quantum dot introduced by the invention contains a large number of lithium-philic groups, and the MXene quantum dot can be used as a seed site to induce a uniform lithium deposition process, thereby effectively inhibiting growth of lithium dendrites and improving coulomb efficiency of a lithium metal battery.
3. Compared with the existing intrinsic SEI film, the MXene quantum dot is directly mixed with the binder and then coated, and the obtained artificial solid electrolyte interface film based on the MXene quantum dot has stable structure, good flexibility and high mechanical strength under the action of the binder, and solves the problems of low mechanical strength and poor flexibility of the intrinsic SEI film generated electrochemically in the prior art.
Drawings
FIG. 1 is a field emission high resolution transmission electron micrograph of MXene quantum dots of example 1.
Fig. 2 is an optical diagram of the interface of a lithium anode material obtained using the artificial solid electrolyte interface film based on MXene quantum dots of example 1.
FIG. 3 is a graph of coulombic efficiency for a bare Li-Cu cell and an MQDs@Li-Cu cell assembled using the MXene quantum dot based artificial solid electrolyte interfacial film of example 1.
FIG. 4 is a voltage versus time graph of a bare Li// Li cell and an MQDs@Li// MQDs@Li cell assembled using the MXene quantum dot based artificial solid electrolyte interfacial film of example 1.
Fig. 5 is a graph of the rate performance of a lithium negative electrode material assembled LiFePO 4// mqds@li battery using the MXene quantum dot-based artificial solid electrolyte interface film of example 1.
Detailed Description
The following detailed description of specific embodiments of the invention is, but it should be understood that the invention is not limited to specific embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The experimental methods described in the examples of the present invention are conventional methods unless otherwise specified.
Considering that the artificial SEI film constructed by adopting the traditional inorganic materials in the prior art can not well solve the problem of SEI film breakage, the invention starts from the selection of inorganic materials, firstly takes MXene quantum dots as the raw materials of the SEI film, and discovers that the obtained artificial solid electrolyte interface film not only effectively controls the growth of lithium dendrites in a secondary battery, but also solves the problems of volume expansion and SEI film breakage of a lithium negative electrode in the circulation process after the MXene quantum dots are mixed with a binder and coated.
The present invention is examined below by using examples, and specific methods and results thereof are shown below:
Example 1
The preparation method of the artificial solid electrolyte interface film based on the MXene quantum dots comprises the following steps:
(1) The Ti 3AlC2 MAX phase powder was etched by acid etching to give an aqueous solution of Ti 3C2Tx MXene at a concentration of 5mg mL -1.
(2) Taking 8mL of Ti 3C2Tx MXene aqueous solution, adding 72mL of water into the Ti 3C2Tx MXene aqueous solution, adding ammonia water, adjusting the pH value to 9.0, placing the solution into a reaction kettle, performing hydrothermal reaction at 100 ℃ for 6h, and then filtering and freeze-drying to collect MXene quantum dots.
(3) Weighing 0.016g of the Ti 3C2Tx MXene quantum dot in the step (2), mixing with 0.004g of PVDF, fully grinding, dispersing the PVDF in 600 mu L of NMP in a glove box, carrying out ultrasonic treatment for 12 hours to obtain slurry, coating the slurry, and then drying the slurry at room temperature for 10 minutes and then at 60 ℃ for 24 hours to obtain the artificial solid electrolyte interface film based on the MXene quantum dot.
The preparation method of the lithium anode comprises the following steps:
and loading an artificial solid electrolyte interface film based on MXene quantum dots on the surface of a lithium sheet with the area of 1cm 2 to obtain the lithium anode.
Example 2
The preparation method of the artificial solid electrolyte interface film based on the MXene quantum dots comprises the following steps:
(1) The Ti 3AlC2 MAX phase powder was etched by acid etching to give an aqueous solution of Ti 3C2Tx MXene at a concentration of 5mg mL -1.
(2) 8ML of the Ti 3C2Tx MXene aqueous solution is taken, 72mL of water is added into the solution, a proper amount of ammonia water is added to adjust the pH value of the solution to 9, the solution is placed into a reaction kettle to react for 6h at 100 ℃, and then a quantum dot sample is collected through filtration and freeze drying.
(3) 0.016G of the Ti 3C2Tx MXene quantum dot obtained in the step (2) and 0.004g of PVDF are weighed and fully ground, the PVDF is dispersed into a mixed solution of 300 mu L of NMP and 300 mu L of THF in a glove box, ultrasonic treatment is carried out for 12 hours, slurry is obtained, the slurry is coated, and then the slurry is dried for 10 minutes at room temperature and then dried for 24 hours at 60 ℃ to obtain the artificial solid electrolyte interface film based on the MXene quantum dot.
The preparation method of the lithium anode comprises the following steps:
and loading an artificial solid electrolyte interface film based on MXene quantum dots on the surface of a lithium sheet with the area of 1cm 2 to obtain the lithium anode.
Example 3
The preparation method of the artificial solid electrolyte interface film based on the MXene quantum dots comprises the following steps:
(1) The Ti 3AlC2 MAX phase powder was etched by acid etching to give an aqueous solution of Ti 3C2Tx MXene at a concentration of 5mg mL -1.
(2) 8ML of the Ti 3C2Tx MXene aqueous solution is taken, 72mL of water is added into the solution, a proper amount of ammonia water is added to adjust the pH value of the solution to 9, the solution is placed into a reaction kettle to react for 6h at 100 ℃, and then a quantum dot sample is collected through filtration and freeze drying.
(3) Weighing 0.016g of Ti 3C2Tx MXene quantum dot obtained in the step (2) and 0.004g of PVDF, fully grinding, dispersing the materials into a mixed solution of 300 mu L of DOL and 300 mu L of DME in a glove box, carrying out ultrasonic treatment for 12 hours to obtain slurry, and after the slurry is coated, drying the slurry at room temperature for 10 minutes and then drying the slurry at 60 ℃ for 24 hours to obtain the artificial solid electrolyte interface film based on the MXene quantum dot.
The preparation method of the lithium anode comprises the following steps:
and loading an artificial solid electrolyte interface film based on MXene quantum dots on the surface of a lithium sheet with the area of 1cm 2 to obtain the lithium anode.
Example 4
The preparation method of the artificial solid electrolyte interface film based on the MXene quantum dots comprises the following steps:
(1) The Ti 3AlC2 MAX phase powder was etched by acid etching to give an aqueous solution of Ti 3C2Tx MXene at a concentration of 5mg mL -1.
(2) 8ML of the Ti 3C2Tx MXene aqueous solution is taken, 72mL of water is added into the solution, a proper amount of ammonia water is added to adjust the pH value of the solution to 10, the solution is placed into a reaction kettle to react for 6h at 110 ℃, and then a quantum dot sample is collected through filtration and freeze drying.
(3) Weighing 0.016g of the Ti 3C2Tx MXene quantum dot obtained in the step (2) and 0.004g of PVDF, fully grinding, dispersing the PVDF in 600 mu L of NMP solution in a glove box, carrying out ultrasonic treatment for 12 hours to obtain slurry, and drying the slurry at room temperature for 10 minutes and then at 60 ℃ for 24 hours after coating to obtain the artificial solid electrolyte interface film based on the MXene quantum dot.
The preparation method of the lithium anode comprises the following steps:
and loading an artificial solid electrolyte interface film based on MXene quantum dots on the surface of a lithium sheet with the area of 1cm 2 to obtain the lithium anode.
Example 5
The preparation method of the artificial solid electrolyte interface film based on the MXene quantum dots comprises the following steps:
(1) The Ti 3AlC2 MAX phase powder was etched by acid etching to give an aqueous solution of Ti 3C2Tx MXene at a concentration of 5mg mL -1.
(2) 8ML of the Ti 3C2Tx MXene aqueous solution is taken, 72mL of water is added into the solution, the solution is subjected to ultrasonic treatment at room temperature for 72h, and then the MXene quantum dot sample is collected through filtration and freeze drying.
(3) Weighing 0.016g of the Ti 3C2Tx MXene quantum dot obtained in the step (2) and 0.004g of PVDF, fully grinding, dispersing the PVDF in 600 mu L of NMP solution in a glove box, carrying out ultrasonic treatment for 12 hours to obtain slurry, and drying the slurry at room temperature for 10 minutes and then at 60 ℃ for 24 hours after coating to obtain the artificial solid electrolyte interface film based on the MXene quantum dot.
The preparation method of the lithium anode comprises the following steps:
and loading an artificial solid electrolyte interface film based on MXene quantum dots on the surface of a lithium sheet with the area of 1cm 2 to obtain the lithium anode.
Example 6
The preparation method of the artificial solid electrolyte interface film based on the MXene quantum dots comprises the following steps:
(1) The Ti 3AlC2 MAX phase powder was etched by acid etching to give an aqueous solution of Ti 3C2Tx MXene at a concentration of 5mg mL -1.
(2) 8ML of the Ti 3C2Tx MXene aqueous solution is taken, 72mL of water is added into the solution, the solution is subjected to ultrasonic treatment at room temperature for 72h, and then the MXene quantum dot sample is collected through filtration and freeze drying.
(3) 0.016G of the Ti 3C2Tx MXene quantum dot obtained in the step (2) and 0.004g of PVDF are weighed and fully ground, the PVDF is dispersed into a mixed solution of 300 mu L of NMP and 300 mu L of THF in a glove box, ultrasonic treatment is carried out for 12 hours, slurry is obtained, the slurry is coated, and then the slurry is dried for 10 minutes at room temperature and then dried for 24 hours at 60 ℃ to obtain the artificial solid electrolyte interface film based on the MXene quantum dot.
The preparation method of the lithium anode comprises the following steps:
and loading an artificial solid electrolyte interface film based on MXene quantum dots on the surface of a lithium sheet with the area of 1cm 2 to obtain the lithium anode.
Example 7
The preparation method of the artificial solid electrolyte interface film based on the MXene quantum dots comprises the following steps:
(1) The Ti 3AlC2 MAX phase powder was etched by acid etching to give an aqueous solution of Ti 3C2Tx MXene at a concentration of 5mg mL -1.
(2) 8ML of the Ti 3C2Tx MXene aqueous solution is taken, 72mL of water is added into the solution, the solution is subjected to ultrasonic treatment at room temperature for 72h, and then the MXene quantum dot sample is collected through filtration and freeze drying.
(3) Weighing 0.016g of Ti 3C2Tx MXene quantum dot obtained in the step (2) and 0.004g of PVDF, fully grinding, dispersing the materials into a mixed solution of 300 mu L of DOL and 300 mu L of DME in a glove box, carrying out ultrasonic treatment for 12 hours to obtain slurry, and after the slurry is coated, drying the slurry at room temperature for 10 minutes and then drying the slurry at 60 ℃ for 24 hours to obtain the artificial solid electrolyte interface film based on the MXene quantum dot.
The preparation method of the lithium anode comprises the following steps:
and loading an artificial solid electrolyte interface film based on MXene quantum dots on the surface of a lithium sheet with the area of 1cm 2 to obtain the lithium anode.
Example 8
The preparation method of the artificial solid electrolyte interface film based on the MXene quantum dots comprises the following steps:
(1) The Ti 3AlC2 MAX phase powder was etched by acid etching to give an aqueous solution of Ti 3C2Tx MXene at a concentration of 5mg mL -1.
(2) 8ML of the Ti 3C2Tx MXene aqueous solution is taken, 72mL of water is added into the solution, the solution is subjected to ultrasonic treatment at room temperature for 150h, and then the MXene quantum dot sample is collected through filtration and freeze drying.
(3) Weighing 0.016g of the Ti 3C2Tx MXene quantum dot obtained in the step (2) and 0.004g of PVDF, fully grinding, dispersing the PVDF in 600 mu L of NMP solution in a glove box, carrying out ultrasonic treatment for 12 hours to obtain slurry, and drying the slurry at room temperature for 10 minutes and then at 60 ℃ for 24 hours after coating to obtain the artificial solid electrolyte interface film based on the MXene quantum dot.
The preparation method of the lithium anode comprises the following steps:
and loading an artificial solid electrolyte interface film based on MXene quantum dots on the surface of a lithium sheet with the area of 1cm 2 to obtain the lithium anode.
In the invention, the artificial solid electrolyte interface film based on the MXene quantum dots for solving the problems of volume expansion and SEI film breaking of the lithium anode in the circulation process is prepared in each of the embodiments 1 to 8, and the lithium anode and the artificial solid electrolyte interface film based on the MXene quantum dots in the embodiment 1 are taken as examples for research, and the specific research method and the specific research result are as follows:
the results in FIG. 1 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 2.75nm.
The results of fig. 2 show that the surface of the lithium negative electrode material obtained using the artificial solid electrolyte interface film based on MXene quantum dots of example 1 is substantially flat, which is advantageous in avoiding the aggregation effect of lithium ions.
Lithium negative electrode materials (abbreviated as MQDs@Li) obtained by using the artificial solid electrolyte interfacial film based on MXene quantum dots in example 1 were assembled into MQDs@Li-Cu batteries, MQDs@Li// MQDs@Li batteries and LiFePO 4// MQDs@Li batteries, all of which were assembled in an argon-filled glove box (water, oxygen values were less than 0.01 PPm), and standard CR2032 type button batteries were obtained.
The separator used for assembling the battery is a commercial Celgard 2325 separator, and for a LiFeO 4// MQDs@Li battery, pure lithium or MQDs@Li is used as a negative electrode, and the positive electrode is prepared by mixing active materials LiFePO 4, conductive carbon black and PVDF in a mass ratio of 8:1:1, grinding the materials in N-methylpyrrolidone solution, and then scraping the materials on an aluminum foil coated with carbon.
For the MQDs@Li// MQDs@Li battery, a pure lithium sheet is used as a positive electrode, and MQDs@Li is used as a negative electrode.
For the MQDs@Li-Cu battery, a copper sheet is used as a positive electrode, and MQDs@Li is used as a negative electrode.
The results in FIG. 3 show that after 150 lithium deposition/stripping events at a current density of 0.5mA/cm 2, the coulomb efficiency of the MQDs@Li-Cu cell was 97.86%, whereas after 53 cycles, the coulomb efficiency of the Li-Cu cell was severely reduced, followed by a complete failure event after 78 cycles.
The results in FIG. 4 show that the MQDs@Li// MQDs@Li battery can stably circulate at a current density of 1mA/cm 2 for 1400 hours, and the final overpotential is only 19.9mV, whereas the Li// Li battery has obvious voltage increase after 700 hours of circulation, which indicates that serious lithium dendrite growth occurs in the Li// Li battery.
The results of fig. 5 show that LiFeO 4// mqds@li batteries assembled with LiFePO 4 as the positive electrode and mqds@li exhibit excellent rate capability with an initial specific discharge capacity of 163.05mAh/g at 0.2C and a capacity of 82.64mAh/g at 10C, and subsequently still exhibit a specific discharge capacity of 159.23mAh/g when the current density is returned to 0.2C, and a capacity retention of 95.12% after 150 cycles. This fully demonstrates the utility of mqds@li.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that such modifications and variations be included herein within the scope of the appended claims and their equivalents.
Claims (10)
1. The preparation method of the artificial solid electrolyte interface film based on the MXene quantum dots is characterized by comprising the following steps:
Taking MAX phase material as raw material to prepare MXene quantum dot;
Dispersing the MXene quantum dots and the binder in a solvent to obtain slurry, coating the slurry, and evaporating the solvent to obtain the artificial solid electrolyte interface film based on the MXene quantum dots.
2. The method for preparing the artificial solid electrolyte interface film based on the MXene quantum dots, which is disclosed in claim 1, is characterized in that the mass ratio of the MXene quantum dots to the binder is 1:9-9:1.
3. The method for preparing the artificial solid electrolyte interface film based on the MXene quantum dots according to claim 1, wherein the binder is at least one selected from 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, wherein the solvent is at least one selected from tetrahydrofuran, N-methylpyrrolidone, 1, 4-dioxane and ethylene glycol dimethyl ether.
5. The method for preparing the artificial solid electrolyte interface film based on the MXene quantum dots according to claim 1, wherein the MXene quantum dots are prepared according to the following steps:
Etching the MAX phase material, and then washing to neutrality to obtain an MXene nano-sheet;
And dissolving the MXene nano-sheet in water to obtain an MXene nano-sheet aqueous solution, regulating the pH of the MXene nano-sheet aqueous solution to 9.0-10.0, performing hydrothermal reaction to obtain an MXene quantum dot aqueous solution, and evaporating water to obtain the MXene quantum dot.
6. The method for preparing the artificial solid electrolyte interface film based on the MXene quantum dots according to claim 1, wherein the MXene quantum dots are prepared according to the following steps:
Etching the MAX phase material, and then washing to neutrality to obtain an MXene nano-sheet;
And dissolving the MXene nano-sheet in water to obtain an MXene nano-sheet aqueous solution, carrying out ultrasonic treatment on the MXene nano-sheet aqueous solution to obtain an MXene quantum dot aqueous solution, and evaporating water to obtain the MXene quantum dot.
7. An artificial solid electrolyte interface film based on MXene quantum dots prepared by the preparation method of claim 1.
8. Use of an artificial solid electrolyte interface film based on MXene quantum dots according to claim 7 for preparing a lithium negative electrode material.
9. The application of the artificial solid electrolyte interface film based on the MXene quantum dots in preparing a lithium anode material, which is characterized in that the application method is as follows:
And coating the slurry on the surface of a lithium sheet, and evaporating the solvent to obtain the lithium anode material.
10. The use of an artificial solid electrolyte interface film based on MXene quantum dots according to claim 9 for preparing lithium negative electrode material, characterized in that the loading of MXene quantum dots on lithium sheet is 0.3-1.0mg/cm 2.
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