CN114156597A - Graphene niobium nitride functional layer for modifying lithium-sulfur battery diaphragm, and preparation and application thereof - Google Patents
Graphene niobium nitride functional layer for modifying lithium-sulfur battery diaphragm, and preparation and application thereof Download PDFInfo
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- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 82
- CFJRGWXELQQLSA-UHFFFAOYSA-N azanylidyneniobium Chemical compound [Nb]#N CFJRGWXELQQLSA-UHFFFAOYSA-N 0.000 title claims abstract description 59
- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical compound [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 239000002346 layers by function Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 56
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- 239000002131 composite material Substances 0.000 claims abstract description 27
- YHBDIEWMOMLKOO-UHFFFAOYSA-I pentachloroniobium Chemical compound Cl[Nb](Cl)(Cl)(Cl)Cl YHBDIEWMOMLKOO-UHFFFAOYSA-I 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
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- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000005406 washing Methods 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims description 30
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims description 20
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 14
- 238000000137 annealing Methods 0.000 claims description 14
- 239000008367 deionised water Substances 0.000 claims description 13
- 229910021641 deionized water Inorganic materials 0.000 claims description 13
- 230000004048 modification Effects 0.000 claims description 12
- 238000012986 modification Methods 0.000 claims description 12
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- 239000010410 layer Substances 0.000 claims 1
- 229920001021 polysulfide Polymers 0.000 abstract description 6
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- 238000013461 design Methods 0.000 abstract description 2
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- 230000007704 transition Effects 0.000 description 2
- 229910001216 Li2S Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
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- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
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- 229910052723 transition metal Inorganic materials 0.000 description 1
- -1 transition metal nitride Chemical class 0.000 description 1
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
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Abstract
The invention provides a graphene niobium nitride functional layer for modifying a lithium-sulfur battery diaphragm, and a preparation method and application thereof, wherein the preparation method comprises the following steps: (1) in a mixed solution of water and ethanol, preparing a uniformly dispersed solution by using niobium chloride and graphene oxide; (2) placing the dispersion liquid in a microwave device for reaction; (3) washing the obtained product with water and ethanol, and drying; (4) and performing ammoniation treatment on the precursor to obtain the niobium nitride nanodot composite nitrogen-doped graphene nanosheet. The niobium nitride nanodot composite nitrogen-doped graphene nanosheet membrane modified functional layer prepared by the method has excellent lithium-sulfur battery performance as a high-efficiency polysulfide catalyst and adsorbent. The method provides a new idea for the design of the multifunctional diaphragm of the lithium-sulfur battery.
Description
Technical Field
The invention belongs to preparation of novel lithium-sulfur battery diaphragm modification materials, and particularly relates to a niobium nitride nano-dot composite nitrogen-doped graphene nanosheet, a preparation method of the nanosheet and application of the nanosheet as a diaphragm modification functional layer in a lithium-sulfur battery.
Background
The rapid development of lithium-sulfur batteries, by virtue of their excellent theoretical capacity (1675mAh g)-1) High energy density (2600Whk g)-1) Low cost, environmental friendliness and earth abundance, and becomes the next generation of commercial large-scale energy storage system. However, the goal of achieving commercial applications of lithium ion batteries has been hampered by various bottlenecks. First, the insulating and discharge product of sulfur, Li2S2/Li2The poor conductivity of S results in a lower material utilization rate and poorer rate performance. Secondly, the polysulfides dissolved in the electrolyte cause a shuttling effect, while Li2S deposits on lithium metal cathodes, resulting in lower coulombic efficiency and severe self-discharge behavior. From polysulphides to Li2S2Solid-liquid phase transition of and from Li2S2To Li2The solid-solid phase transition of S hinders the conversion of electrochemical kinetics, resulting in premature termination of the discharge process and slow reaction kinetics. Therefore, the intense search for highly conductive and strongly adsorptive electrocatalysts is an effective method for inhibiting the shuttle effect and accelerating the kinetics of polysulfide redox reactions.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a simple and efficient method for preparing the niobium nitride nano-dot composite nitrogen-doped graphene nanosheet and the niobium nitride nano-dot composite nitrogen-doped graphene nanosheet as a diaphragm modified functional layer applied to a lithium-sulfur battery.
In the invention, researchers find that the niobium nitride nano-dot composite nitrogen-doped graphene nanosheet is applied to a lithium-sulfur battery as a diaphragm modification functional layer. The material has the characteristics of integrated micro-nano structure: nitrogen doped graphiteThe alkene nano-sheet remarkably improves the conductivity of the material, and is rich in conduction paths of ion/electron transfer; the niobium nitride nanodots with high conductivity and catalytic activity and a large number of active sites are favorable for electron/ion transfer and improve the utilization rate of active substances, and can promote Li as polysulfide anchoring media2The homogeneous nucleation and growth of S promotes the redox kinetics of polysulfides. The invention has simple experimental process, good repeatability and low cost, and provides a feasible preparation method for the application of the transition metal nitride composite material in the lithium-sulfur battery.
In order to achieve the purpose, the invention provides a graphene niobium nitride functional layer for modifying a lithium-sulfur battery diaphragm, a preparation method and application thereof.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a preparation method of a graphene niobium nitride functional layer for modifying a lithium-sulfur battery diaphragm comprises the following steps:
step 1: preparing a precursor: taking 25-100 mg of niobium chloride, 15-60 mg of graphene oxide and 600-800 mg of urotropine as raw materials, taking 20-40 ml of water and 20-40 ml of ethanol as solvents, firstly dissolving niobium chloride and urotropine powder in the ethanol to obtain a solution A, ultrasonically dispersing the graphene oxide in the water to obtain a solution B, mixing the solution A and the solution B, and stirring for 0.5 hour at room temperature;
step 2: preparing a precursor: putting the mixed solution into a microwave device, and reacting for 0.5 hour at 80 ℃ and 800W; collecting a product after the microwave reaction is finished to obtain brown yellow precursor powder;
and step 3: an ammoniation process: and (3) carrying out high-temperature annealing treatment on the brown yellow precursor powder in an ammonia atmosphere through a tube furnace, wherein the high-temperature annealing treatment is carried out at 800 ℃ for 5 hours, and obtaining final product powder.
Preferably, step 1 further comprises:
taking 25-100 mg of niobium chloride, 15-60 mg of graphene oxide and 600-800 mg of urotropine as raw materials, taking 20-40 ml of deionized water and 20-40 ml of ethanol as solvents, and firstly dissolving niobium chloride and urotropine powder in the ethanol to obtain a solution A; and putting the graphene oxide into deionized water, carrying out ultrasonic treatment for 0.5 hour by using a cell crusher to obtain uniform dispersion liquid B, mixing the solution A and the solution B, and stirring for 0.5 hour at room temperature.
Preferably, in step 3, the tube furnace is heated at a rate of 5 ℃ per minute.
Preferably, step 1 further comprises: preparing a precursor: taking 50 mg of niobium chloride, 30 mg of graphene oxide and 700 mg of urotropine as raw materials, taking 30 ml of deionized water and 30 ml of ethanol as solvents, firstly dissolving niobium chloride and urotropine powder in the ethanol to obtain a solution A, ultrasonically dispersing the graphene in the deionized water to obtain a solution B, mixing the solutions A and B, and stirring for 0.5 hour at room temperature.
Preferably, in step 2, the microwave reaction product is centrifugally washed with water and ethanol, and finally dried in a vacuum drying oven at 60 ℃ for 12 hours to obtain brown yellow precursor powder.
The invention also provides a graphene niobium nitride functional layer for modifying the lithium-sulfur battery diaphragm, which is prepared by the method and is a composite nitrogen-doped graphene nanosheet of niobium nitride nanodots.
The preferable mode is that the nano-point niobium nitride is uniformly dispersed on the whole surface of the nitrogen-doped graphene nano-sheet.
The invention also provides an application of the graphene niobium nitride functional layer for modifying the lithium-sulfur battery diaphragm, and the niobium nitride nanodot composite nitrogen-doped graphene nanosheet is used as the diaphragm modification functional layer and applied to the lithium-sulfur battery to improve the cycle performance of the lithium-sulfur battery.
Compared with the prior art, the invention has the advantages that:
1. the material has the shape of a nano-dot composite nanosheet structure, and has good conductivity, adsorption performance and catalytic performance.
2. The invention has simple experimental process, repeatability and low cost.
3. The niobium nitride nanodot composite nitrogen-doped graphene nanosheet provided by the invention shows excellent electrochemical performance of the lithium-sulfur battery, and provides a new idea for the design of a multifunctional diaphragm of the lithium-sulfur battery.
Drawings
FIG. 1 is an X-ray diffraction diagram of a graphene niobium nitride functional layer for modifying a lithium-sulfur battery separator prepared according to the invention;
FIG. 2 is a transmission electron microscope image of a graphene niobium nitride functional layer for modifying a lithium-sulfur battery separator prepared according to the present invention;
FIG. 3 is a cycle performance diagram of a graphene niobium nitride functional layer for modifying a lithium-sulfur battery separator according to the present invention;
in fig. 1 and 3, NG represents a nitrogen-doped graphene nanoplate in the prior art, and NbN @ NG represents a niobium nitride nanodot composite nitrogen-doped graphene nanoplate of the present invention.
Fig. 1 is an X-ray diffraction pattern of the composite nitrogen-doped graphene nanoplatelets prepared in the present invention, and it can be seen that the synthesized product conforms to a standard PDF card of pure niobium nitride.
Fig. 2 is a transmission electron microscope image of the niobium nitride nanodot composite nitrogen-doped graphene nanosheet prepared by the method, and it can be seen that the nanodots are uniformly loaded on the two-dimensional nanosheet in shape.
Fig. 3 is a cycle performance diagram of the niobium nitride nanodot composite nitrogen-doped graphene nanosheet prepared by the method, and it can be seen that the material has excellent cycle stability.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Comparative example
A preparation method of a nitrogen-doped graphene nanosheet comprises the following steps:
and (3) carrying out high-temperature annealing treatment on 30 mg of graphene oxide powder in a tube furnace in an ammonia atmosphere, wherein the high-temperature annealing treatment is carried out at 800 ℃ for 5 hours, so as to obtain the nitrogen-doped graphene nanosheet.
Examples
A preparation method of a graphene niobium nitride functional layer for modifying a lithium-sulfur battery diaphragm comprises the following steps:
step 1: preparing a precursor: taking 25-100 mg of niobium chloride, 15-60 mg of graphene oxide and 600-800 mg of urotropine as raw materials, taking 20-40 ml of deionized water and 20-40 ml of ethanol as solvents, and firstly dissolving niobium chloride and urotropine powder in the ethanol to obtain a solution A; putting graphene oxide into deionized water, performing ultrasonic treatment for 0.5 hour by using a cell crusher to obtain uniform dispersion liquid B, mixing the solution A and the solution B, and stirring for 0.5 hour at room temperature;
step 2: preparing a precursor: putting the mixed solution into a microwave device, and reacting for 0.5 hour at 80 ℃ and 800W; and (3) centrifugally washing the microwave reaction product by using water and ethanol, and finally drying the microwave reaction product in a vacuum drying oven at the temperature of 60 ℃ for 12 hours to obtain brown yellow precursor powder.
And step 3: an ammoniation process: and (3) carrying out high-temperature annealing treatment on the brown-yellow precursor powder in an ammonia atmosphere through a tubular furnace, wherein the heating rate in the tubular furnace is 5 ℃ per minute, and the high-temperature annealing treatment is 800 ℃ and is kept for 5 hours, so that final product powder is obtained.
The prepared graphene niobium nitride functional layer for modifying the lithium-sulfur battery diaphragm is a niobium nitride nano-dot composite nitrogen-doped graphene nanosheet. As shown in fig. 2, the nano-dot niobium nitride is uniformly dispersed on the entire surface of the nitrogen-doped graphene nanoplatelets.
The niobium nitride nanodot composite nitrogen-doped graphene nanosheet is used as a diaphragm modification functional layer and applied to a lithium-sulfur battery to improve the cycle performance of the lithium-sulfur battery.
Example 1
The embodiment provides a preparation method of a graphene niobium nitride functional layer for modifying a lithium-sulfur battery diaphragm, which comprises the following steps:
step 1: preparing a precursor: taking 50 mg of niobium chloride, 30 mg of graphene oxide and 700 mg of urotropine as raw materials, taking 30 ml of water and 30 ml of ethanol as solvents, and firstly dissolving niobium chloride and urotropine powder in the ethanol to obtain a solution A; and putting the graphene oxide into deionized water, carrying out ultrasonic treatment for 0.5 hour by using a cell crusher to obtain uniform dispersion liquid B, mixing the solution A and the solution B, and stirring for 0.5 hour at room temperature.
Step 2: preparing a precursor: putting the mixed solution into a microwave reaction device, and reacting for 0.5 hour at 80 ℃ and 800W; and after the reaction is finished, collecting a product, centrifugally washing the reaction product by using water and ethanol, and finally drying the reaction product in a vacuum drying oven at the temperature of 60 ℃ for 12 hours to obtain brown yellow precursor powder.
And step 3: an ammoniation process: and (3) carrying out high-temperature annealing treatment on the brown yellow precursor powder in an ammonia atmosphere by using a tubular furnace, wherein the high-temperature annealing treatment is carried out at 800 ℃ for 5 hours, and the heating rate in the tubular furnace is 5 ℃ per minute. The final product powder was obtained.
The prepared graphene niobium nitride functional layer for modifying the lithium-sulfur battery diaphragm is a niobium nitride nano-dot composite nitrogen-doped graphene nanosheet. As shown in fig. 2, the nano-dot niobium nitride is uniformly dispersed on the entire surface of the nitrogen-doped graphene nanoplatelets.
The niobium nitride nanodot composite nitrogen-doped graphene nanosheet is used as a diaphragm modification functional layer and applied to a lithium-sulfur battery to improve the cycle performance of the lithium-sulfur battery.
Example 2
The embodiment provides a preparation method of a graphene niobium nitride functional layer for modifying a lithium-sulfur battery diaphragm, which comprises the following steps:
step 1: preparing a precursor: taking 25 mg of niobium chloride, 15 mg of graphene oxide and 600 mg of urotropine as raw materials, taking 20 ml of water and 20 ml of ethanol as solvents, and firstly dissolving niobium chloride and urotropine powder in the ethanol to obtain a solution A; and putting the graphene oxide into deionized water, carrying out ultrasonic treatment for 0.5 hour by using a cell crusher to obtain uniform dispersion liquid B, mixing the solution A and the solution B, and stirring for 0.5 hour at room temperature.
Step 2: preparing a precursor: putting the mixed solution into a microwave reaction device, and reacting for 0.5 hour at 80 ℃ and 800W; and after the reaction is finished, collecting a product, centrifugally washing the reaction product by using water and ethanol, and finally drying the reaction product in a vacuum drying oven at the temperature of 60 ℃ for 12 hours to obtain brown yellow precursor powder.
And step 3: an ammoniation process: and (3) carrying out high-temperature annealing treatment on the brown yellow precursor powder in an ammonia atmosphere by using a tubular furnace, wherein the high-temperature annealing treatment is carried out at 800 ℃ for 5 hours, and the heating rate in the tubular furnace is 5 ℃ per minute. The final product powder was obtained.
The prepared graphene niobium nitride functional layer for modifying the lithium-sulfur battery diaphragm is a niobium nitride nano-dot composite nitrogen-doped graphene nanosheet. As shown in fig. 2, the nano-dot niobium nitride is uniformly dispersed on the entire surface of the nitrogen-doped graphene nanoplatelets.
The niobium nitride nanodot composite nitrogen-doped graphene nanosheet is used as a diaphragm modification functional layer and applied to a lithium-sulfur battery to improve the cycle performance of the lithium-sulfur battery.
Example 3
The embodiment provides a preparation method of a graphene niobium nitride functional layer for modifying a lithium-sulfur battery diaphragm, which comprises the following steps:
step 1: preparing a precursor: taking 100 mg of niobium chloride, 60 mg of graphene oxide and 800 mg of urotropine as raw materials, taking 40 ml of water and 40 ml of ethanol as solvents, and firstly dissolving niobium chloride and urotropine powder in the ethanol to obtain a solution A; and putting the graphene oxide into deionized water, carrying out ultrasonic treatment for 0.5 hour by using a cell crusher to obtain uniform dispersion liquid B, mixing the solution A and the solution B, and stirring for 0.5 hour at room temperature.
Step 2: preparing a precursor: putting the mixed solution into a microwave reaction device, and reacting for 0.5 hour at 80 ℃ and 800W; and after the reaction is finished, collecting a product, centrifugally washing the reaction product by using water and ethanol, and finally drying the reaction product in a vacuum drying oven at the temperature of 60 ℃ for 12 hours to obtain brown yellow precursor powder.
And step 3: an ammoniation process: and (3) carrying out high-temperature annealing treatment on the brown yellow precursor powder in an ammonia atmosphere by using a tubular furnace, wherein the high-temperature annealing treatment is carried out at 800 ℃ for 5 hours, and the heating rate in the tubular furnace is 5 ℃ per minute. The final product powder was obtained.
The prepared graphene niobium nitride functional layer for modifying the lithium-sulfur battery diaphragm is a niobium nitride nano-dot composite nitrogen-doped graphene nanosheet. As shown in fig. 2, the nano-dot niobium nitride is uniformly dispersed on the entire surface of the nitrogen-doped graphene nanoplatelets.
The niobium nitride nanodot composite nitrogen-doped graphene nanosheet is used as a diaphragm modification functional layer and applied to a lithium-sulfur battery to improve the cycle performance of the lithium-sulfur battery.
Performance analysis
Example 1 differs from the comparative example in that: in the comparative example, niobium chloride was not added.
Example 1 differs from examples 2 and 3 in that: in the step 1, the dosage of the precursor raw materials and the volume of the solvent are different.
The niobium nitride nanodot composite nitrogen-doped graphene nanosheet is subjected to vacuum filtration on a diaphragm, then packaged on a CR2025 button cell, and the electrochemical performance of the cell is tested to obtain the following cycle performance table:
comparative example and example Performance comparison Table
By comparing the comparative example with example 1, it can be concluded that: according to the invention, after the niobium nitride nanodot is compounded with the nitrogen-doped graphene nanosheet, the cycle performance is remarkably improved by 16.4%
Example 1 compares with examples 2 and 3, and example 1 has the best cycle performance, because under the condition, the niobium nitride nanodots can be better loaded on the nitrogen-doped graphene nano-sheets, and more active sites are exposed, so that the electrochemical reaction kinetics are promoted.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. A preparation method of a graphene niobium nitride functional layer for modifying a lithium-sulfur battery diaphragm is characterized by comprising the following steps:
step 1: preparing a precursor: taking 25-100 mg of niobium chloride, 15-60 mg of graphene oxide and 600-800 mg of urotropine as raw materials, taking 20-40 ml of water and 20-40 ml of ethanol as solvents, firstly dissolving niobium chloride and urotropine powder in the ethanol to obtain a solution A, ultrasonically dispersing the graphene oxide in the water to obtain a solution B, mixing the solution A and the solution B, and stirring for 0.5 hour at room temperature;
step 2: preparing a precursor: putting the mixed solution into a microwave device, and reacting for 0.5 hour at 80 ℃ and 800W; collecting a product after the microwave reaction is finished to obtain brown yellow precursor powder;
and step 3: an ammoniation process: and (3) carrying out high-temperature annealing treatment on the brown yellow precursor powder in an ammonia atmosphere through a tube furnace, wherein the high-temperature annealing treatment is carried out at 800 ℃ for 5 hours, and obtaining final product powder.
2. The preparation method of the graphene niobium nitride functional layer for modifying the lithium-sulfur battery separator according to claim 1, wherein the method comprises the following steps: the step 1 further comprises the following steps:
taking 25-100 mg of niobium chloride, 15-60 mg of graphene oxide and 600-800 mg of urotropine as raw materials, taking 20-40 ml of deionized water and 20-40 ml of ethanol as solvents, and firstly dissolving niobium chloride and urotropine powder in the ethanol to obtain a solution A; and putting the graphene oxide into deionized water, carrying out ultrasonic treatment for 0.5 hour by using a cell crusher to obtain uniform dispersion liquid B, mixing the solution A and the solution B, and stirring for 0.5 hour at room temperature.
3. The preparation method of the graphene niobium nitride functional layer for modifying the lithium-sulfur battery separator according to claim 1, wherein the method comprises the following steps: in step 3, the rate of temperature rise in the tube furnace is 5 ℃ per minute.
4. The preparation method of the graphene niobium nitride functional layer for modifying the lithium-sulfur battery separator according to claim 1, wherein the method comprises the following steps: the step 1 further comprises the following steps: preparing a precursor: taking 50 mg of niobium chloride, 30 mg of graphene oxide and 700 mg of urotropine as raw materials, taking 30 ml of deionized water and 30 ml of ethanol as solvents, firstly dissolving niobium chloride and urotropine powder in the ethanol to obtain a solution A, ultrasonically dispersing the graphene in the deionized water to obtain a solution B, mixing the solutions A and B, and stirring for 0.5 hour at room temperature.
5. The preparation method of the graphene niobium nitride functional layer for modifying the lithium-sulfur battery separator according to claim 1, wherein the method comprises the following steps: and 2, centrifugally washing the microwave reaction product by using water and ethanol, and finally drying in a vacuum drying oven at 60 ℃ for 12 hours to obtain brown yellow precursor powder.
6. The functional graphene niobium nitride layer for modifying the lithium-sulfur battery separator prepared by the method of any one of claims 1 to 5, wherein: the composite material is a niobium nitride nanodot composite nitrogen-doped graphene nanosheet.
7. The functional layer of graphene niobium nitride for modification of a lithium sulfur battery separator according to claim 6, characterized in that: the nano-dot niobium nitride is uniformly dispersed on the whole surface of the nitrogen-doped graphene nanosheet.
8. The application of the graphene niobium nitride functional layer for modifying the lithium-sulfur battery diaphragm, which is disclosed by claim 6, is characterized in that: the niobium nitride nanodot composite nitrogen-doped graphene nanosheet is used as a diaphragm modification functional layer and applied to a lithium-sulfur battery to improve the cycle performance of the lithium-sulfur battery.
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