CN112018353A - WTE2/MXene composite material and preparation method thereof - Google Patents

WTE2/MXene composite material and preparation method thereof Download PDF

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CN112018353A
CN112018353A CN202010816586.4A CN202010816586A CN112018353A CN 112018353 A CN112018353 A CN 112018353A CN 202010816586 A CN202010816586 A CN 202010816586A CN 112018353 A CN112018353 A CN 112018353A
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wte
composite material
mxene
preparation
mxene composite
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张业龙
徐晓丹
周健文
孙宏阳
林志扬
彭章泉
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Wuyi University
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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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/581—Chalcogenides or intercalation compounds thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention discloses a WTE2The preparation method of the/MXene composite material comprises the following steps: (1) adding MXene material and reducing agent into dispersant to prepare dispersion liquid with concentration of 1-10mg/ml, and stirring for 5-10 hours; (2) mixing a tungsten source and a tellurium source according to a molar ratio of 1: 2-3, and stirring for 6-18 hours to obtain a mixed solution; (3) heating the mixed solution obtained in the step (2) to the temperature of 100 ℃ and 220 ℃, preserving the heat for 8-20h, and cooling to obtain a suspension; (4) centrifuging, washing and drying the suspension obtained in the step (3) to obtain WTE2the/MXene composite material. Book (I)WTE prepared by invention2the/MXene composite material has excellent rate performance, good cycling stability, higher reversible specific capacity and coulombic efficiency, low production cost, rich resources and simple preparation method, and has important research significance for large-scale production and application of the potassium ion battery.

Description

WTE2/MXene composite material and preparation method thereof
Technical Field
The invention belongs to the technical field of potassium ion batteries, and particularly relates to a WTE2a/MXene composite material and a preparation method thereof.
Background
Since the 21 st century, with the rapid development of modern society, due to exhaustion and non-regenerability of fossil energy, environmental pollution and energy crisis are becoming more severe, effective utilization of renewable energy has great practical significance for sustainable development of society. Therefore, there is a need for energy storage materials with excellent storage capacity and fast reaction kinetics to improve the energy crisis. At present, the widespread use of lithium ion batteries leads the lithium ion batteries to occupy a leading position in the aspect of energy storage, however, the lithium resources cannot completely meet the requirements of the current society for energy storage due to the defects of uneven resource distribution, higher cost and the like. Therefore, research on a novel secondary alkali metal battery has become one of important issues in the field of new energy technology.
The potassium metal element in the same main group with the lithium metal element is similar to the lithium metal in chemical properties and rich in reserves (the abundance of the potassium element in the earth crust is about 2.47 percent, and the content of the potassium element in seawater is about 0.38g/kg), and meanwhile, the potassium has the characteristics of lower standard oxidation-reduction potential, weaker solvent acting force, wider voltage window, smaller electronegativity and the like, so that the potassium ion battery has good dynamic performance and becomes a research hotspot of a new generation of energy storage system. However, the electrode material has severe volume expansion and severe damage to the electrode material structure in the charge-discharge cycle process due to the large radius and high mass of potassium ions, so that the specific capacity of the battery is rapidly attenuated, and the battery has poor rate performance and poor cycle stability.
At present, the negative electrode materials for the potassium ion secondary battery mainly include carbon materials, metals, metal oxides and organic materials, and these materials have many defects: the method has the potential safety hazard of potassium electroplating, and the electrode material has irreversible capacity loss, poorer rate performance and cycling stability and lower charge-discharge coulombic efficiency due to volume expansion and pulverization in the cycling process because of too large potassium ion radius. The defects seriously restrict the practical application of the negative electrode materials in the potassium ion secondary battery, thereby restricting the development and the application of the potassium ion secondary battery. Therefore, research on a negative electrode material with excellent rate performance, long cycle life, high coulombic efficiency, high safety and high stability has been a focus of current potassium ion battery development.
WTe2As a transition two-dimensional transition metal sulfur compound, the compound has higher reversible specific capacity, however, the single transition metal compound generates huge volume expansion in the repeated disintercalation process of potassium ions, so that the electrode material is crushed and falls off and is easy to agglomerate, thereby leading to poorer electrochemical performance; MXene as a novel two-dimensional transition metal carbon/nitride or carbonitride has higher specific surface area and high conductivity, is beneficial to ion and electron transmission, but has smaller interlayer spacing and certain adsorbability of surface functional groups, so that the single use cannot achieve the ideal ion rapid migration effect.
Disclosure of Invention
In view of the problems of the prior art, it is an object of the present invention to provide a WTe2the/MXene composite material. It is another object of the present invention to provide the WTE2A preparation method of/MXene composite material. Further, the invention provides a WTE2Application of/MXene composite material and WTE2the/MXene composite material is applied to the negative electrode of the potassium ion battery, the potassium ion battery is assembled into a button battery, and the WTE is tested2The potassium storage performance of the/MXene electrode material.
The invention adopts the following technical scheme:
WTE2The preparation method of the/MXene composite material comprises the following steps:
(1) mixing MXene material and reducing agent material according to the weight ratio of 1: 1-2, stirring for 5-10h, such as 5h, 6h, 7h, 9h and 10h, to prepare a dispersion with a concentration of 1-10mg/ml, preferably 1-9mg/ml, more preferably 3-8mg/ml, and still more preferably 4-7 mg/ml;
(2) a tungsten source and a tellurium source are mixed according to the proportion of 1: 2-3, preferably 1: 2-4, and more preferably 1: 2-3, adding the mixture into the dispersion liquid obtained in the step (1), and stirring for 6-18 hours, such as 6 hours, 10 hours, 15 hours and 18 hours, to obtain a mixed liquid;
(3) transferring the mixed solution obtained in the step (2) into a reaction kettle, placing the reaction kettle into an oven, heating to the temperature of 100 ℃, 220 ℃, for example, 100 ℃, 140 ℃, 180 ℃ and 220 ℃, preserving the heat for 8-20h, for example, 8h, 10h, 15h, 18h and 20h, and then naturally cooling to the room temperature to obtain a suspension;
(4) centrifuging the suspension obtained in the step (3), repeatedly washing filter residue by using a cleaning agent, and then placing the filter residue in a vacuum drying oven for drying to obtain the WTE2the/MXene composite material.
Further, the tungsten source is Na2WO4·2H2O、WCl6、(NH4)6H2W12O40·xH2One or more of O.
Further, the tellurium source is one or more of tellurium tetrachloride, biphenyl ditellurium and potassium tellurite.
Further, MXene is Ti3C2Tx、V3C2Tx、Mo3N2Tx、Nb2CTx、Ta4C3TxPreferably Nb2CTxE.g. V3C2TxWherein T isxIs a surface functional group-O, -F or-OH.
Further, the reducing agent is urea and NH4And F is one or more.
Further, the dispersing agent is one or more of N, N-dimethylformamide, ethanol and glycol.
Further, the dispersion liquid in the step (3) is moved into a reaction kettle, the reaction kettle is placed into an oven, the temperature is increased to 220 ℃ at 100-.
Further, the cleaning agent is one or more of water and ethanol, preferably, the product obtained in the step (3) is thoroughly cleaned by deionized water and absolute ethanol, and the product can be cleaned by alternately cleaning the product by the deionized water and the absolute ethanol for 2 to 15 times, preferably 3 to 9 times.
Further, the rotation speed of the centrifugation in the step (4) is 5000-.
Further, the temperature of vacuum drying in step (4) is 50-80 ℃, preferably 60 ℃, and the drying time is 6-20h, preferably 12h, such as 8h, 10h, 15h, 20 h; the degree of vacuum does not exceed 120Pa, for example 120Pa, 110Pa, 100Pa, 90 Pa.
Further, the WTE2WTE in/MXene composite material2The loading amount is 60-220 wt%, such as 60-90 wt%, 80-150 wt%, 100-180 wt%, 150-220 wt%.
The potassium ion battery cathode comprises the WTE prepared by the preparation method2the/MXene composite material.
A potassium ion battery includes the above battery negative electrode.
The invention has the beneficial effects that:
(1) and simple WTE2Material ratio, WTE prepared by the invention2the/MXene composite material has a layered structure, WTE2The interaction of the material and the Mxene nano material forms stable structural support, and the MXene material can effectively relieve the volume expansion and WTE of the electrode material in the circulation process2the/MXene composite material has good conductivity, has a rapid ion diffusion channel and is beneficial to rapid de-intercalation of potassium ions.
(2) WTE prepared by the invention2the/MXene composite material is applied to the negative electrode of the potassium ion battery, and electrochemical test results show that the WTE2the/MXene electrode material has higher reversible specific capacity, shows good charge-discharge cycle stability and almost 100 percent of charge-discharge coulombic efficiency.
(3) The composite material has the advantages of simple preparation process, high production efficiency, low raw material cost, abundant resources, high reversible specific capacity and the like, and has great research value for large-scale development and application of potassium ion batteries.
Drawings
FIG. 1 shows WTE in example 12Scanning electron microscope images of the/MXene composite material;
FIG. 2 shows WTE in example 12A cycle performance graph of the/MXene composite material assembled potassium ion battery measured at a current density of 100 mA/g;
FIG. 3 is a schematic illustration of a WTE version of comparative example 12A cycle performance chart of the assembled potassium ion battery measured at a current density of 100 mA/g;
FIG. 4 is a graph of the cycling performance of the MXene assembled potassium ion cell alone of comparative example 2 at a current density of 100 mA/g.
Detailed Description
For better explanation of the present invention, the following specific examples are further illustrated, but the present invention is not limited to the specific examples.
Wherein the materials are commercially available unless otherwise specified;
the Ti3C2TxNanoparticles were purchased from beijing beike science and technology ltd, code BK2020011814, sheet stacking thickness: 1-5 μm, purity: 99%, product application field: energy storage, catalysis, analytical chemistry, and the like.
The method is a conventional method unless otherwise specified.
The invention provides a WTE2The preparation method of the/MXene composite material is characterized in that the WTE2The synthesis method of (2) is a simple hydrothermal synthesis method.
Example 1
WTE2The preparation method of the/MXene composite material comprises the following steps:
(1) 1mmol of MXene (V) was taken3C2Tx) Adding 1.5mmol of urea into N, N-dimethylformamide, and magnetically stirring for 5 hr to obtain a solution with a concentration1mg/ml dispersion;
(2) 1mmol of WCl6Adding 2mmol of tellurium tetrachloride into the dispersion liquid obtained in the step (1), and stirring for 6 hours to obtain a mixed liquid;
(3) transferring the mixed solution obtained in the step (2) into a reaction kettle with the capacity of 100ml, sealing, placing in an oven, heating to 120 ℃, preserving heat for 8 hours, and then cooling to room temperature to obtain a suspension;
(4) centrifuging the suspension obtained in the step (3) for 5 minutes by using a centrifugal machine under the condition of 5000r/min, alternately washing filter residue for 3 times by using deionized water and absolute ethyl alcohol, and drying in a vacuum drying oven at the drying temperature of 60 ℃ for 6 hours to finally obtain the WTE2the/MXene composite material.
Will WTE2The mass ratio of the/MXene composite material to the polyvinylidene fluoride and the carbon black is 8: 1: 1, adding a proper amount of N-methyl pyrrolidone, stirring to form uniform slurry, coating the uniform slurry on a current collector, performing vacuum drying and slicing to prepare a potassium ion battery negative plate, assembling the potassium ion battery negative plate into a button battery, and testing the electrochemical performance of the button battery.
WTE prepared in this example2The electrochemical test result of the/MXene electrode material shows that the reversible specific capacity is 340mAh/g after 200 cycles under the current density of 100mA/g, and the material is pure WTE23.33 times (102mAh/g), and WTE in this example2the/MXene electrode material has higher coulombic efficiency, good charge-discharge cycle stability and excellent rate capability.
Example 2
WTE2The preparation method of the/MXene composite material comprises the following steps:
(1) 1mmol of MXene (V) was taken3C2Tx) Adding 2mmol of urea into N, N-dimethylformamide, and magnetically stirring for 8 hours to obtain a dispersion liquid;
(2) 1mmol of WCl6Adding 2.3mmol of tellurium tetrachloride into the dispersion liquid obtained in the step (1), and stirring for 12 hours to obtain a mixed liquid;
(3) transferring the mixed solution obtained in the step (2) into a reaction kettle with the capacity of 50ml, sealing, placing in an oven, heating to 180 ℃, preserving heat for 15h, and then cooling to room temperature to obtain a suspension;
(4) centrifuging the suspension obtained in the step (3) for 7 minutes under the 7000r/min condition by using a centrifuge, alternately washing filter residue for 3 times by using deionized water and absolute ethyl alcohol, and drying in a vacuum drying oven at the drying temperature of 60 ℃ for 12 hours to finally obtain the WTE2the/MXene composite material.
Will WTE2The mass ratio of the/MXene composite material to the polyvinylidene fluoride and the carbon black is 8: 1: 1, adding a proper amount of N-methyl pyrrolidone, stirring to form uniform slurry, coating the uniform slurry on a current collector, performing vacuum drying and slicing to prepare a potassium ion battery negative plate, assembling the potassium ion battery negative plate into a button battery, and testing the electrochemical performance of the button battery.
WTE prepared in this example2The electrochemical test result of the/MXene electrode material shows that the reversible specific capacity is 458mAh/g after 200 cycles under the current density of 100mA/g, and the material is pure WTE24.49 times (102mAh/g), and WTE in this example2the/MXene electrode material has higher coulombic efficiency, good charge-discharge cycle stability and excellent rate capability.
Example 3
WTE2The preparation method of the/MXene composite material comprises the following steps:
(1) 1mmol of MXene (V) was taken3C2Tx) Adding 2.5mmol of urea into N, N-dimethylformamide, and magnetically stirring for 10 hours to obtain a dispersion liquid;
(2) 1mmol of WCl6Adding 2.3mmol of tellurium tetrachloride into the dispersion liquid obtained in the step (1), and stirring for 18 hours to obtain a mixed liquid;
(3) transferring the mixed solution obtained in the step (2) into a reaction kettle with the capacity of 50ml, sealing, placing the reaction kettle in an oven, heating to 220 ℃, preserving heat for 20 hours, and then cooling to room temperature to obtain a suspension;
(4) centrifuging the suspension obtained in the step (3) for 10 minutes by using a centrifugal machine under the condition of 8000r/min, alternately washing filter residue for 3 times by using deionized water and absolute ethyl alcohol, and then placing the filter residue in a vacuum drying ovenDrying at 60 ℃ for 20 hours to finally obtain the WTE2the/MXene composite material.
Will WTE2The mass ratio of the/MXene composite material to the polyvinylidene fluoride and the carbon black is 8: 1: 1, adding a proper amount of N-methyl pyrrolidone, stirring to form uniform slurry, coating the uniform slurry on a current collector, performing vacuum drying and slicing to prepare a potassium ion battery negative plate, assembling the potassium ion battery negative plate into a button battery, and testing the electrochemical performance of the button battery.
WTE prepared in this example2The electrochemical test result of the/MXene electrode material shows that the reversible specific capacity is 410mAh/g after 200 cycles under the current density of 100mA/g, and the material is pure WTE24.02 times (102mAh/g), and WTE in this example2the/MXene electrode material has higher coulombic efficiency, good charge-discharge cycle stability and excellent rate capability.
Comparative example 1
WTE-only2The preparation method of the material comprises the following steps:
(1) 1mmol of WCl6Adding 2mmol of tellurium tetrachloride into N, N-dimethylformamide, and stirring for 6 hours to prepare a dispersion liquid with the concentration of 1 mg/ml;
(2) transferring the uniform dispersion liquid obtained in the step (1) into a reaction kettle with the capacity of 100ml, sealing, placing in an oven, heating to 120 ℃, preserving heat for 8 hours, and then cooling to room temperature to obtain a mixed liquid;
(3) centrifuging the mixed solution obtained in the step (2) for 5 minutes by using a centrifuge under the condition of 5000r/min, alternately washing filter residue for 3 times by using deionized water and absolute ethyl alcohol, and drying in a vacuum drying oven at the drying temperature of 60 ℃ for 6 hours to finally obtain the WTE2A material.
Will WTE2The material, polyvinylidene fluoride and carbon black are mixed according to the mass ratio of 8: 1: 1, adding a proper amount of N-methyl pyrrolidone, stirring to form uniform slurry, coating the uniform slurry on a current collector, performing vacuum drying and slicing to prepare a potassium ion battery negative plate, assembling the potassium ion battery negative plate into a button battery, and testing the electrochemical performance of the button battery.
Comparative example 2
Weighing 80mg of MXene material, 10mg of super P and 10mg of polyvinylidene fluoride binder, mixing, adding a small amount of N-methylpyrrolidone, stirring, coating on a copper foil, drying at 90 ℃ for 3 hours, cutting the copper foil into a round shape by using a slicing machine to serve as a working electrode, drying, putting the round shape into an inert atmosphere glove box with oxygen and water contents lower than 0.4ppm, and assembling into a 2032 type button battery by using a metal potassium sheet as a counter electrode and glass fiber as a diaphragm. The reversible specific capacity is 61.1mA h/g after 100 cycles under the current density of 100 mA/g.
WTE prepared in this comparative example2The electrochemical test result of the electrode material shows that the reversible specific capacity is 102mAh/g after 200 cycles under the current density of 100 mA/g.
FIG. 1 shows WTE in example 12Scanning electron microscope images of the/MXene composite material; from FIG. 1 it can be seen that the sample has a layered structure, WTE2The nano-sheet is uniformly loaded on the surface of the MXene material, and no agglomeration phenomenon occurs, thus indicating that WTE2The laminated structure of the/MXene composite material is successfully prepared and effectively increases the interlayer spacing and the specific surface area.
FIGS. 2-4 show WTE in example 12/MXene composite, pure WTE2The cycle performance of a pure MXene assembled potassium ion battery is measured under the current density of 100 mA/g. Through comparison, it is not difficult to find that the WTE is a pure WTE2The material has certain potassium storage capacity, but in the charging and discharging process, because of the pure WTE2The material is easy to agglomerate, the structure is unstable after the potassium ions are repeatedly embedded and removed, the specific capacity is obviously declined after 20 circles in the charging and discharging process, and the good cycle stability and the excellent rate property are not generated; the reversible capacity of the pure MXene is very low and is only 61.1mA h/g; as can be seen from FIG. 2, the WTE of example 12the/MXene composite material has high specific capacity and good cycle performance. This is because of the resulting composite layered structure and WTe2The interaction of the material and the Mxene nanometer material forms stable structural support, and the stable specific capacity is still kept after 200 cycles; at the same time, WTE2Volume change pole of/MXene composite material in potassium insertion/removal cycle processSmall and therefore has good cycling stability and extremely high charge-discharge coulombic efficiency.
The above description is only exemplary of the present invention and is not intended to limit the scope of the present invention, which is defined by the claims appended hereto, as well as the appended claims.

Claims (10)

1. WTE2The preparation method of the/MXene composite material is characterized by comprising the following steps:
(1) adding MXene material into dispersant to prepare dispersion liquid with concentration of 1-10 mg/ml;
(2) mixing a tungsten source and a tellurium source according to the ratio of 1: 2-3, adding the mixture into the dispersion liquid obtained in the step (1), and uniformly stirring to obtain a mixed liquid;
(3) reacting the mixed solution obtained in the step (2) at the temperature of 100-220 ℃ for 8-20h, and cooling to obtain a suspension;
(4) filtering the suspension liquid obtained in the step (3), washing, centrifuging and drying in vacuum to obtain the WTE2the/MXene composite material.
2. The WTe of claim 12The preparation method of the/MXene composite material is characterized in that the MXene is Ti3C2Tx、V3C2Tx、Mo3N2Tx、Nb2CTx、Ta4C3TxOne or more of (a).
3. The WTe of claim 12The preparation method of the/MXene composite material is characterized in that the tungsten source is Na2WO4·2H2O、WCl6、(NH4)6H2W12O40·xH2One or more of O.
4. The WTe of claim 12Preparation of/MXene composite materialThe preparation method is characterized in that the tellurium source is one or more of tellurium tetrachloride, diphenyl ditelluride and potassium tellurite.
5. The WTe of claim 12The preparation method of the/MXene composite material is characterized in that the reducing agent is urea and NH4At least one of F; preferably, the dispersant is at least one of N, N-dimethylformamide, ethanol and ethylene glycol.
6. The WTe of claim 12The preparation method of the/MXene composite material is characterized in that the WTE2WTE in/MXene composite material2The loading amount is 60-220 wt%.
7. The WTe of claim 12The preparation method of the/MXene composite material is characterized in that the rotation speed of the centrifugation in the step (4) is 5000-.
8. The WTe of claim 12The preparation method of the/MXene composite material is characterized in that the temperature of vacuum drying in the step (4) is 50-80 ℃, the time is 6-20h, and the vacuum degree is not more than 120 Pa.
9. A potassium ion battery negative electrode, characterized in that it comprises WTE prepared by the preparation method of any one of claims 1 to 82the/MXene composite material.
10. A potassium ion battery comprising the battery negative electrode of claim 9.
CN202010816586.4A 2020-08-14 2020-08-14 WTE2/MXene composite material and preparation method thereof Withdrawn CN112018353A (en)

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CN110550660A (en) * 2019-09-04 2019-12-10 江苏理工学院 preparation method of tungsten disulfide/MXene composite material
CN110788346A (en) * 2019-10-11 2020-02-14 陕西科技大学 Preparation method of tungsten ditelluride/redox graphene compound with semimetal structure and copper-doped compound powder thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113990540A (en) * 2021-09-28 2022-01-28 哈尔滨工业大学 Flash device resistant to heavy ion single event effect and preparation method thereof

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