CN108428870B - Large-scale preparation method and application of two-dimensional carbon sheet aerogel material compounded by metal and metal derivatives thereof - Google Patents
Large-scale preparation method and application of two-dimensional carbon sheet aerogel material compounded by metal and metal derivatives thereof Download PDFInfo
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Abstract
The invention discloses a large-scale preparation method and application of a two-dimensional carbon sheet aerogel material compounded by metal and metal derivatives thereof, and belongs to the technical field of preparation of functional nano materials. Adding water into a mixture of agarose and metal salt, carrying out microwave heating treatment in a microwave reactor to obtain metal salt-agarose composite foam, and further calcining the foam to obtain carbon aerogel consisting of two-dimensional carbon sheets compounded by metal nano particles. The carbon aerogel prepared by the method has the characteristics of high specific surface area, high graphitization, larger two-dimensional area, high conductivity, fast ion transmission channel, high active site and the like, and has the advantages of high capacity, high stability and high activity in energy storage and electrochemical catalytic reaction. The whole material has simple preparation process and low raw material price, and is suitable for large-scale production.
Description
Technical Field
The invention relates to a preparation method of a metal and metal derivative composite two-dimensional carbon sheet aerogel material capable of being used as an energy storage and electrochemical catalysis material, and belongs to the technical field of preparation of functional nano materials.
Background
The energy crisis is still a global problem to be solved urgently. The large consumption of fossil energy leads to the increasing exhaustion of fossil energy, and causes environmental pollution and global warming. The energy problem can be effectively solved by developing a new energy technology. The battery technology stores energy in the form of chemical energy, and is a green and efficient energy storage and conversion technology. The lithium ion battery has the characteristics of long cycle life, high energy density, low self-discharge, environmental friendliness and the like, is widely applied to mobile energy equipment such as mobile phones, computers, electric automobiles and the like, and is an energy conversion technology which is the most mature in technology and the most widely applied in the field of new energy. In addition, the fuel cell can directly convert biomass energy into a new energy technology for discharging, compared with the traditional cell, the process of converting the biomass energy into chemical energy is reduced, the limitation of Carnot cycle is avoided, and the utilization rate of fuel is greatly improved. Fuel cell technology has been applied to new energy vehicles at present.
The negative electrode material of the current commercial lithium ion battery is graphite, and the theoretical specific capacity of the graphite is only 372mAh g-1And the demand of the market for high-performance lithium ion batteries cannot be met. Therefore, it is necessary to develop a lithium ion battery cathode material with high specific capacity and low cost. In the field of fuel cells, oxygen reduction (ORR) requires a catalyst to increase efficiency, and oxygen can be combined with fuel after reduction. The commercial catalyst is carbon-supported platinum, which is expensive and easy to be poisoned, and the like, so that the development of the fuel cell is restricted.
Aerogel is a nano material with low density, high porosity and high specific surface area. The high specific surface area can increase catalytic active sites and improve catalytic performance. The carbon-based aerogel can also be used as a protective layer in the charging and discharging process of the battery to limit the volume expansion of the active material caused by reaction from being separated from the current collector. Therefore, the aerogel can effectively improve the electrochemical performance of the material. The invention is the core of the invention in the large-scale preparation of aerogels by simple conditions. The problems of high cost, low efficiency and the like of the commercial battery can be solved.
The transition metal oxide is a conversion-type negative electrode material because of its high theoretical specific capacity (1000 mAh g)-1) The anode material has the advantages of abundant reserves, low price, environmental friendliness and the like, and is considered as the next generation of anode material. However, the problems of poor conductivity, fast capacity fading, poor rate capability and the like of the transition metal oxide restrict the commercial application of the transition metal oxide, so researchers modify the transition metal oxide by various methods. Carbon-coated transition metal oxide composites are one of the current research hotspots. The carbon material can stably exist in the lithium ion battery electrolyte and has a protection effect on the transition metal oxide, so that the attenuation of the performance of the transition metal oxide can be effectively relieved.
Agarose (agarose) is a linear polymer. Solubility in water increases with increasing temperature and dissolves above about 90 ℃. After cooling, a translucent gel was formed. In agarose gel, there is a network structure formed by secondary chains of sugar chains, so agarose can provide a carbon source and also serve as a precursor of a two-dimensional carbon sheet.
Urea (urea) is an organic substance with a very high nitrogen content and is often used as a chemical nitrogen fertilizer. The nitrogen-doped carbon material has the advantages of low price, high nitrogen content and good water solubility, is often used as a nitrogen source in material synthesis, and researches show that the nitrogen-doped carbon material has excellent ORR catalytic activity.
Disclosure of Invention
The invention provides a simple process for preparing a metal and metal derivative composite two-dimensional carbon sheet aerogel material with excellent electrochemical performance in a large scale by using low-cost raw materials. Wherein the prepared nitrogen is doped with Fe3C aerogel has excellent ORR performance, Fe/Fe3O4The composite aerogel has excellent lithium ion battery performance. Solves the problems of complex production process, high cost, poor performance and the like of commercial battery materials.
The nanocomposite prepared by the invention is realized by the following experimental scheme.
A large-scale preparation method of a two-dimensional carbon sheet aerogel material compounded by metal and metal derivatives thereof comprises the following steps:
a. and adding water to mix the carbon precursor and metal salt, wherein the carbon precursor is agarose or a mixture of agarose and a nitrogen-containing carbon source, the metal salt is a salt containing iron, cobalt, nickel, manganese or molybdenum metal elements, and the mixture is placed in a microwave reactor for reaction for 5-60 s. The obtained solution is subjected to microwave reaction for 30-120 s, the reaction times are 1-5 times, and after the water is evaporated to dryness, solid foam of the carbon precursor-metal derivative filled in the beaker is obtained;
b. calcining the solid foam obtained in the step a in a tubular furnace at a high temperature of 700-1200 ℃ for 1-10h, wherein the heating rate is 2-15 ℃/min, the atmosphere is inert atmosphere, and the iron carbide nanoparticle composite two-dimensional carbon nanosheet Fe is prepared3C @ CNSs, cobalt nanoparticle composite two-dimensional carbon nanosheet Co @ CNSs, nickel nanoparticle composite two-dimensional carbon nanosheet Ni @ CNSs and molybdenum carbide nanoparticle composite two-dimensional carbon nanosheet Mo2C @ CNSs and iron carbide nanoparticle composite two-dimensional nitrogen-doped carbon nanosheet Fe3C@NCNS；
c. And c, calcining the product in the step b in a tubular furnace at the low temperature of 200-500 ℃ for 10-100 h at the heating rate of 2-15 ℃/min, wherein the atmosphere is an atmospheric atmosphere, and obtaining corresponding metal oxide composite two-dimensional carbon nanosheets FeOx @ CNSs, CoOx @ CNSs, NiOx @ CNSs, MoOx @ CNSs and FeOx @ NCNSs.
Preferably, the nitrogen-containing carbon source used in step a is urea or melamine.
Preferably, the metal salt, agarose and nitrogen-containing carbon source mixture used in step a are mixed thoroughly for interaction.
Preferably, the mass ratio of the metal salt to the agarose to the nitrogen-containing carbon source used in the step a is 1-3: 2-5: 0-1.
Preferably, the power of the microwave reactor used in the step a is 700-1200W.
Preferably, the inert gas under the heat treatment condition in the step b is nitrogen or argon.
The metal and the metal derivative thereof are compounded into a two-dimensional carbon sheet aerogel material, and the metal oxide or carbide is compounded into a two-dimensional carbon sheet FeOx @ CNSs, CoOx @ CNSs, Mo2C @ CNSs, NiOx @ CNSs or MnOx @ CNSs and metal oxides or carbonCompound composite nitrogen-doped two-dimensional carbon sheet CoOx @ NCNSs, NiOx @ NCNSs and MoC2@ NCNSs or Fe3The C @ NCNSs nano material is applied to energy storage and conversion, metal ion batteries, metal air batteries or super capacitors and electrocatalysis.
Preferably, the metal oxide or carbide composite two-dimensional carbon sheets FeOx @ CNSs, CoOx @ CNSs and MoC2The @ CNSs, NiOx @ CNSs or MnOx @ CNSs can be used as electrode materials of ion batteries or super capacitors; metal oxide or carbide composite nitrogen-doped two-dimensional carbon sheet CoOx @ NCNSs, NiOx @ NCNSs and MoC2@ NCNSs or Fe3C @ NCNSs can be used as an electrode material of an electrocatalytic or air battery.
Preferably, the method for manufacturing the cathode material of the ion battery by using the nano material comprises the following steps:
a. compounding metal oxide or carbide with two-dimensional carbon sheets FeOx @ CNSs, CoOx @ CNSs and MoC2The nano material of @ CNSs, NiOx @ CNSs or MnOx @ CNSs is a metal oxide or carbide composite two-dimensional carbon sheet prepared according to active substances: conductive agent acetylene black: the mass ratio of polyvinylidene fluoride (PVDF) as a binder is 8: 1: 1, fully mixing and grinding materials, acetylene black and polyvinylidene fluoride (PVDF), adding a solvent N-methyl pyrrolidone (NMP) to uniformly mix the materials to obtain uniformly dispersed slurry, uniformly coating the uniformly dispersed slurry on a copper foil current collector, transferring the copper foil current collector to a vacuum drying oven, and drying the copper foil current collector at 60 DEG C>24h；
b. A metal lithium sheet is taken as a positive electrode, 1.0M L iPF6 is dissolved in EC, DMC, EMC, 1: 1: 1 Vol% and used as electrolyte, a polypropylene film is taken as a diaphragm, a button cell is assembled in a glove box, and the assembled cell is subjected to cell performance test on a cell test cabinet.
Preferably, the metal oxide or carbide is compounded with nitrogen-doped two-dimensional carbon sheets CoOx @ NCNSs, NiOx @ NCNSs, MoC2@ NCNSs or Fe3The C @ NCNSs can be used as an electrode catalytic material and can be applied to electrochemical catalytic reaction, oxygen reduction and precipitation or hydrogen precipitation reaction can be carried out, and the electrochemical catalytic activity can be tested in 0.1-1.0M KOH solution electrolyte at room temperature.
Compared with the traditional method for preparing the two-dimensional carbon sheet or aerogel, the method has very strong universality, and is suitable for compounding a plurality of metals in practical cases, so that the application range of the material is greatly expanded. The experimental operation steps are simple, the experiment is quick, and the obtained material has high two-dimensional area (micron-sized) and nano-level metal particles and has extremely high specific surface area. The chemical agent has high utilization rate in the experimental process, and does not need any surfactant, so that after the material is synthesized, no post-treatment is needed. In addition, in the process of preparing the carbide, part of the carbide has a hollow structure, and the volume expansion caused by electrochemical reaction can be effectively relieved in the aspect of electrochemical application. In application, the battery performance of the material obtained by the method exceeds the theoretical capacity of the oxide, and the material has quite excellent capacity contribution under high-rate charge and discharge conditions. In addition, the metal carbide composite nitrogen-doped two-dimensional carbon sheet aerogel has excellent electrocatalytic performance and has a very bright prospect in the application of fuel cells.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a scanning electron microscope image of a carbon nanosheet composited with iron carbide particles in example 1 of the present invention under different magnifications
FIG. 2 is a scanning electron microscope image of carbon nanosheets composited with iron/iron oxide particles in example 1 of the present invention under different magnifications
FIG. 3 is a scanning electron microscope image of carbon nanosheets composited with cobalt metal particles in embodiment 2 of the present invention under different magnifications
FIG. 4 is a scanning electron microscope image of carbon nanosheets composited with metallic nickel particles in embodiment 3 of the present invention under different magnifications
FIG. 5 is a scanning electron microscope image of a molybdenum carbide particle compounded carbon nanosheet under different magnifications in embodiment 4 of the invention
FIG. 6 is an XRD analysis chart of carbon nanosheets composited with iron carbide particles and carbon nanosheets composited with iron/iron oxide particles in example 1 of the present invention
FIG. 7 is an XRD analysis diagram of carbon nanosheets composited with cobalt particles in example 2 of the present invention
FIG. 8 is an XRD analysis diagram of carbon nano-sheets composited by nickel particles in example 3 of the invention
FIG. 9 is a performance diagram of a lithium ion battery with iron/iron oxide particle compounded carbon nanosheets in example 1 of the present invention
FIG. 10 is an ORR performance graph of nitrogen-doped carbon nanosheets composited with iron carbide particles in example 5 of the present invention
Detailed Description
Example 1
3g of agarose and 2g of Fe (NO)3)3·9H2Adding O into 10m L deionized water to form a block, then placing the block into a microwave oven for microwave heating for 30s, melting the block to form a reddish brown solution, fully stirring the solution, continuing placing the solution into the microwave oven for microwave heating for 120s, gradually boiling the solution to dry to form a brown block which is filled in a beaker, transferring the block into a tubular furnace, raising the temperature to 900 ℃ at a raising speed of 2 ℃ per minute under the nitrogen atmosphere, keeping the temperature for 2 hours for calcination, and obtaining Fe after calcination3C, black aerogel consisting of particles and two-dimensional carbon sheets.
Calcining the aerogel in air at 250 ℃ for 20 hours to obtain Fe/Fe3O4The aerogel formed by compounding the particles with the two-dimensional carbon sheets is used as a negative electrode material to be prepared into a lithium ion battery for testing.
Example 2
3g of agarose and 2g of Co (NO)3)2·6H2Adding O into deionized water with the volume of 10m L to form a block, then placing the block into a microwave oven for microwave heating for 30s, melting the block to form a red solution, fully stirring the solution, continuing placing the solution into the microwave oven for microwave heating for 120s, gradually boiling the solution to dry to form a red block which is filled and taken out of a beaker, transferring the block into a tubular furnace, raising the temperature to 900 ℃ at the temperature rise rate of 2 ℃ per minute under the nitrogen atmosphere, keeping the temperature for 2 hours, and calcining to obtain black aerogel consisting of Co particle composite two-dimensional carbon sheets.
Example 3
3g of agarose and 2g of Ni (NO)3)2·6H2Adding of OThe method comprises the steps of forming a block in deionized water with the thickness of 10m L, placing the block into a microwave oven for microwave heating for 30s, melting the block to form a green solution, fully stirring the solution, continuing placing the solution into the microwave oven for microwave heating for 120s, gradually boiling the solution to dryness to form a light green block which is filled in a beaker, transferring the block into a tubular furnace, raising the temperature to 900 ℃ at the rate of 2 ℃ per minute under the nitrogen atmosphere, keeping the temperature for 2 hours, and calcining to obtain the black aerogel consisting of Ni particle composite two-dimensional carbon sheets.
Example 4
3g of agarose and 2g H24Mo7N6O24·4H2Adding O into 10m L deionized water to form a block, then placing the block into a microwave oven for microwave heating for 30s, melting the block to form a light green solution, fully stirring the solution, continuing placing the solution into the microwave oven for microwave heating for 120s, gradually boiling the solution to dry to form a light green block which is filled in a beaker, transferring the block into a tubular furnace, raising the temperature to 900 ℃ at a rate of 2 ℃ per minute under the nitrogen atmosphere, keeping the temperature for 2 hours for calcination, and obtaining Mo after calcination2C, black aerogel consisting of particles and two-dimensional carbon sheets.
Example 5
3g of agarose, 2g of Fe (NO)3)3·9H2Adding O and 1g of urea into 10m L of deionized water to form a block, then placing the block into a microwave oven for microwave heating for 30s, melting the block to form a reddish brown solution, fully stirring the solution, continuing placing the solution into the microwave oven for microwave heating for 120s, gradually boiling the solution to dryness to form a brown block which is filled in a beaker, transferring the block into a tubular furnace, raising the temperature to 900 ℃ at a rate of 2 ℃ per minute under the nitrogen atmosphere, keeping the temperature for 2 hours for calcination, and obtaining Fe after calcination3C, compounding the black aerogel consisting of the nitrogen-doped two-dimensional carbon sheets with the particles. The obtained Fe3And carrying out electrocatalysis test on the black aerogel consisting of the C particles and the nitrogen-doped two-dimensional carbon sheets in 0.1M KOH electrolyte.
Example 6
1. Preparation method of metal and metal carbide composite two-dimensional carbon sheet aerogel
Dissolving metal salt (such as Cu, Fe, Co, Ni, Mo and Mn) and agarose (1-5 g:2-10g) in 5-30m L ultrapure water, stirring thoroughly, transferring to microwave reactor, reacting for 1-10min under microwave condition (such as 500-1500W) for 1-5 times, and evaporating to obtain polymer-metal composite.
And transferring the polymer-metal composite to a tubular furnace, calcining for 1-10h at high temperature (such as 600-.
2. Preparation method of metal oxide composite two-dimensional carbon sheet aerogel
The metal or metal carbide composite two-dimensional carbon sheet aerogel of the prepared composite is placed in a tubular furnace and reacts for 5-120h at a lower temperature (such as 200-. Obtaining the metal oxide composite two-dimensional carbon sheet aerogel.
3. Preparation method of metal carbide composite nitrogen-doped two-dimensional carbon sheet
Dissolving metal salt (such as Cu, Fe, Co, Ni, Mo and Mn), agarose and urea (1-5 g:2-10g:2-5g) in 5-30m L ultrapure water, stirring thoroughly, transferring to microwave reactor, reacting for 1-10min in several times (1-5 times) under microwave condition (such as 500 and 1500W), and evaporating to obtain polymer-metal composite.
And transferring the polymer-metal composite to a tubular furnace, calcining for 1-10h at high temperature (such as 600-.
4. Energy storage application of lithium ion battery of metal oxide composite two-dimensional carbon sheet aerogel
The method comprises the steps of firstly, fully mixing and grinding a material, acetylene black and polyvinylidene fluoride (PVDF) according to the mass ratio of an active substance to a binder of 8: 1: 1, adding a solvent N-methyl pyrrolidone (NMP) to uniformly mix the material to obtain a uniformly dispersed slurry, then uniformly coating the uniformly dispersed slurry on a copper foil current collector, then transferring the copper foil into a vacuum drying box, drying for 24 hours at 60 ℃, taking a metal lithium sheet as a positive electrode, dissolving 1.0M L iPF6 in EC, DMC, EMC 1: 1: 1: 1 Vol% as an electrolyte, taking a polypropylene film as a diaphragm, assembling a button battery in a glove box, and carrying out constant current charge-discharge cycle test on the assembled battery on a battery test cabinet (Shenzhenwei CT-4008), wherein the working voltage is 0.01-3V.
5. Electrocatalysis application of metal carbide composite nitrogen-doped two-dimensional carbon sheet
Grinding 3mg of metal carbide composite nitrogen-doped two-dimensional carbon sheet aerogel, dispersing the ground metal carbide composite nitrogen-doped two-dimensional carbon sheet aerogel in a solution of ethanol and water in a ratio of 4:1, adding 5 wt% of nafion solution of 5 mu L as an adhesive, ultrasonically dispersing the mixed solution for 30min to uniformly disperse the mixed solution, loading the obtained solution on a glassy carbon electrode to enable the loading capacity of the material on the glassy carbon electrode to be 0.2mg/cm < 2 >, rotating a rotary disc electrode device (pine) by taking a platinum sheet as a counter electrode, a silver/silver chloride electrode as a reference electrode and the glassy carbon electrode as a working electrode and taking 0.1M potassium hydroxide saturated oxygen solution as electrolyte, and performing linear volt-ampere test on an electrochemical working station, wherein the test voltage range is 0.2-0.8V.
Claims (9)
1. A large-scale preparation method of a two-dimensional carbon sheet aerogel material compounded by metal, metal carbide or metal oxide is characterized by comprising the following steps:
a. mixing a carbon precursor with metal salt and water, wherein the carbon precursor is agarose or a mixture of agarose and a nitrogen-containing carbon source, the metal salt is nitrate or ammonium molybdate containing iron, cobalt and nickel metal elements, and the mixture of the carbon precursor and the metal salt and the water is placed in a microwave reactor for reaction for 5-60 s; continuing microwave reaction on the obtained solution for 30-120 s for 1-5 times, and evaporating water to obtain solid foam of the carbon precursor filled in the beaker;
b. c, putting the solid foam obtained in the step a into a tube furnace, and heating at a high temperature of 700-120 DEG C0oCalcining C for 1-10h at a temperature rise rate of 2-15oC/min, wherein the atmosphere is inert atmosphere, and the iron carbide nanoparticle composite two-dimensional carbon nanosheet Fe is prepared3C @ CNSs, cobalt nanoparticle composite two-dimensional carbon nanosheet Co @ CNSs, nickel nanoparticle composite two-dimensional carbon nanosheet Ni @ CNSs and molybdenum carbide nanoparticle composite two-dimensional carbon nanosheet Mo2C @ CNSs and iron carbide nanoparticle composite two-dimensional nitrogen-doped carbon nanosheet Fe3C @ NCNSs and molybdenum carbide nanoparticle composite two-dimensional nitrogen-doped carbon nanosheet Mo2C @ NCNSs, cobalt nanoparticle composite nitrogen-doped two-dimensional carbon nanosheets Co @ NCNSs or nickel nanoparticle composite nitrogen-doped two-dimensional carbon nanosheets Ni @ NCNSs;
c. c, enabling the product in the step b to be in a tube furnace at a low temperature of 200-500 DEG CoThe temperature rise rate of the C calcination for 10-100 h is 2-15oC/min, wherein the atmosphere is atmospheric atmosphere, and corresponding metal oxide composite two-dimensional carbon nano sheets FeOx @ CNSs, CoOx @ CNSs, NiOx @ CNSs, MoOx @ CNSs, FeOx @ NCNSs, MoOx @ NCNSs, CoOx @ NCNSs or NiOx @ NCNSs are obtained;
and c, obtaining the metal and metal carbide compounded two-dimensional carbon sheet aerogel material from the step b, and obtaining the metal oxide compounded two-dimensional carbon sheet aerogel material from the step c.
2. The large-scale preparation method of the metal, metal carbide or metal oxide compounded two-dimensional carbon sheet aerogel material according to claim 1, wherein the mass production method comprises the following steps: the nitrogen-containing carbon source used in the step a is urea or melamine.
3. The large-scale preparation method of the metal, metal carbide or metal oxide compounded two-dimensional carbon sheet aerogel material according to claim 1, wherein the mass production method comprises the following steps: the mass ratio of the metal salt to the agarose to the nitrogen-containing carbon source used in the step a is 1-3: 2-5: 0-1.
4. The large-scale preparation method of the metal, metal carbide or metal oxide compounded two-dimensional carbon sheet aerogel material according to claim 1, wherein the mass production method comprises the following steps: the power adopted by the microwave reactor used in the step a is 700-1200W.
5. The large-scale preparation method of the metal, metal carbide or metal oxide compounded two-dimensional carbon sheet aerogel material according to claim 1, wherein the mass production method comprises the following steps: the inert gas under the heat treatment condition in the step b is nitrogen or argon.
6. Use of a two-dimensional carbon sheet aerogel material composited from metal, metal carbide or metal oxide according to claim 1, characterized in that: the metal oxide or carbide composite two-dimensional carbon nano-sheet FeOx @ CNSs, CoOx @ CNSs and Mo2C @ NCNSs, NiOx @ CNSs or metal oxide or carbide composite nitrogen-doped two-dimensional carbon nanosheet CoOx @ NCNSs, NiOx @ NCNSs, Mo2C @ NCNSs or Fe3The C @ NCNSs nano material is applied to energy storage and conversion or electrocatalysis.
7. The use of a metal, metal carbide or metal oxide compounded two dimensional carbon sheet aerogel material according to claim 6, wherein: the metal oxide or carbide composite two-dimensional carbon sheet FeOx @ CNSs, CoOx @ CNSs and Mo2C @ NCNSs or NiOx @ CNSs are used as electrode materials of the ion battery or the super capacitor; metal oxide or carbide composite nitrogen-doped two-dimensional carbon sheet CoOx @ NCNSs, NiOx @ NCNSs and Mo2C @ NCNSs or Fe3C @ NCNSs as electrocatalytic or air cell electrode materials.
8. The use of a metal, metal carbide or metal oxide compounded two dimensional carbon sheet aerogel material according to claim 7, wherein: the preparation method of the two-dimensional carbon sheet aerogel material compounded by metal, metal carbide or metal oxide used as the negative electrode material of the ion battery comprises the following steps:
a. preparing a metal, metal carbide or metal oxide composite two-dimensional carbon sheet aerogel material according to active substances: conductive agent acetylene black: the mass ratio of polyvinylidene fluoride (PVDF) as a binder is 8: 1:fully mixing and grinding a metal, metal carbide or metal oxide composite two-dimensional carbon sheet aerogel material, acetylene black and polyvinylidene fluoride (PVDF), adding a solvent N-methylpyrrolidone (NMP), uniformly mixing the materials to obtain uniformly dispersed slurry, uniformly coating the slurry on a copper foil current collector, transferring the copper foil current collector to a vacuum drying oven, and drying at 60 DEG CoDrying under C>24 h；
b. A metal lithium sheet is taken as a counter electrode, 1.0M L iPF6 is dissolved in EC: DMC: EMC = 1: 1: 1 Vol% to be taken as electrolyte, a polypropylene film is taken as a diaphragm, a button cell is assembled in a glove box, and the assembled cell is subjected to cell performance test on a cell test cabinet.
9. The use of a metal, metal carbide or metal oxide compounded two dimensional carbon sheet aerogel material according to claim 7, wherein: metal oxide or carbide composite nitrogen-doped two-dimensional carbon sheet CoOx @ NCNSs, NiOx @ NCNSs and Mo2C @ NCNSs or Fe3C @ NCNSs is used as an electrode catalytic material and applied to electrochemical catalytic reactions.
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