CN114597560A - Graphene/boron nitride aerogel and preparation method thereof - Google Patents

Graphene/boron nitride aerogel and preparation method thereof Download PDF

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CN114597560A
CN114597560A CN202210196120.8A CN202210196120A CN114597560A CN 114597560 A CN114597560 A CN 114597560A CN 202210196120 A CN202210196120 A CN 202210196120A CN 114597560 A CN114597560 A CN 114597560A
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graphene
boron nitride
aerogel
nitride aerogel
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冯雷
魏鹏
宋浩杰
贾晓华
杨进
邵丹
王思哲
李永
何鑫
张佳旭
王晨欢
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Shaanxi University of Science and Technology
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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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
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    • B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
    • B01J13/0091—Preparation of aerogels, e.g. xerogels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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    • H—ELECTRICITY
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    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
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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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
    • H—ELECTRICITY
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
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Abstract

The invention provides a graphene/boron nitride aerogel and a preparation method thereof, wherein the preparation method comprises the following steps: carrying out pyrolysis treatment on the melamine diborate aerogel to obtain boron nitride aerogel; depositing graphene on a substrate by using a chemical vapor deposition method by taking boron nitride aerogel as the substrate to obtain graphene/boron nitride aerogel; the aerogel material has the characteristics of heat insulation, Joule heating, elasticity and the like when being used as a battery module material, and compared with the traditional battery module aerogel material, the aerogel material can greatly reduce the production cost of the battery while improving the safety and stability of the battery.

Description

Graphene/boron nitride aerogel and preparation method thereof
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a graphene/boron nitride aerogel and a preparation method thereof.
Background
With the rapid development of new energy automobiles, the safety and stability of the internal power battery are closely concerned. Thermal runaway, the decay of low-temperature battery capacity, is a major factor affecting the safety and stability of batteries. At the present stage, the main measures for solving the problem of battery explosion caused by battery thermal runaway are to adopt some battery module materials with good heat insulation effect, for example, a thermal insulation board fireproof felt (such as glass fiber, ceramic fiber cotton and the like) is used as a material for a battery module, the purpose of inhibiting the battery thermal runaway is achieved by utilizing the good heat insulation effect of the battery module materials, but the battery module materials have the problems that surface fibers are easy to break and pulverize, floating fibers or powder pollution is caused, and the battery module materials are not suitable for being used under the conditions of high temperature, compression and vibration for a long time.
In addition, the external environment temperature is an important factor influencing the stability of the battery, when the battery is in a low-temperature environment (less than 0 ℃), the problem of battery capacity attenuation (the attenuation is one third of the room temperature) easily occurs, and the endurance mileage of the new energy automobile is seriously influenced. The problem of low-temperature capacity attenuation of the battery can be solved by starting from battery research and development at the present stage and improving the low-temperature circulation stability of the battery, and although the measure can improve the problem of low-temperature capacity attenuation of the battery, the production cost of the battery is increased.
If prepare an aerogel and as car battery module material, have thermal-insulated, can function such as joule heating, elasticity concurrently, not only can improve battery thermal runaway problem, still can provide the heating function when the battery is in low temperature environment, improve battery low temperature capacity decay problem, the expansion contraction force that its elasticity can cushion the battery and produce at the charge-discharge in-process.
At present, the material used in the battery module is mainly SiO2The base aerogel needs to be doped with fibers (such as glass fibers, ceramic fibers, carbon fibers and the like) to enhance the strength and elasticity of the material due to the problems of brittleness, frangibility, falling-off of powder on the surface and the like. However, SiO2The base aerogel only improves the problem of thermal runaway of the battery, cannot realize the battery heating function in a low-temperature environment, and needs an extra heating system to heat and preserve heat of the whole battery module in a low-temperature state.
Although carbon-based aerogel (such as graphene and carbon nanotubes) has excellent joule heating characteristics, the problem of brittleness and fragility exists in the application process of the carbon-based aerogel, and the problem of mechanical shrinkage and expansion of the battery caused by charging and discharging cannot be effectively solved. Based on this, be expected to realize having the multi-functional aerogel module material that has thermal-insulated, can joule heating, elasticity etc. characteristic concurrently through the combination of carbon base aerogel and ceramic base aerogel. However, no relevant aerogel has been reported and patented at this time.
Disclosure of Invention
The invention aims to provide a graphene/boron nitride aerogel and a preparation method thereof, and solves the defects in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a preparation method of graphene/boron nitride aerogel, which comprises the following steps:
performing pyrolysis treatment on the melamine diborate aerogel to obtain boron nitride aerogel;
and (3) taking the boron nitride aerogel as a matrix, and depositing graphene on the matrix by using a chemical vapor deposition method to obtain the graphene/boron nitride aerogel.
Preferably, the preparation method of the melamine diborate aerogel comprises the following steps:
dissolving melamine and boric acid in a cosolvent, and fully stirring to obtain a melamine diborate solution, wherein the molar ratio of the melamine to the boric acid is 1: 5-5: 1;
the cosolvent comprises water and methanol, ethanol, isopropanol, n-butyl alcohol or tert-butyl alcohol, wherein the volume ratio of the water to the methanol, the ethanol, the isopropanol, the n-butyl alcohol or the tert-butyl alcohol is 7: 5-9: 11;
and (3) carrying out freeze drying treatment on the melamine diborate solution to obtain the melamine diborate aerogel.
Preferably, the process conditions of the freeze-drying treatment are:
the vacuum freeze drying treatment time is 12-48 h.
Preferably, the specific process for obtaining the boron nitride aerogel by carrying out pyrolysis treatment on the melamine diborate aerogel comprises the following steps:
carrying out pyrolysis in a high-temperature atmosphere, wherein the pyrolysis temperature is 500-2000 ℃; the pyrolysis time is 0.5-12 h.
Preferably, the high-temperature atmosphere is one or a mixture of any two of ammonia, argon and nitrogen.
Preferably, the graphene is deposited on the substrate by using a chemical vapor deposition method, and the specific process comprises the following steps:
the carbon source with a high O/C ratio is used as the carbon source, and the graphene content in the graphene/boron nitride aerogel is 10-35% of the total amount of the graphene/boron nitride aerogel.
The graphene/boron nitride aerogel is prepared by the preparation method.
Preferably, the graphene/boron nitride aerogel is a composite nanobelt structure.
Preferably, the length of the composite nanobelt structure is 1 μm to 900 μm; the width is 50 nm-15 mu m
Compared with the prior art, the invention has the beneficial effects that:
according to the preparation method, the boron nitride aerogel is prepared by pyrolyzing the melamine diborate aerogel, then the chemical vapor deposition process is used for growing the graphene on the boron nitride aerogel matrix in situ, the graphene is uniformly grafted in the boron nitride aerogel from inside to outside by adopting the chemical vapor deposition method, and the multifunctional aerogel integrating heat insulation, elasticity and joule heating property is obtained; meanwhile, graphene grows on the boron nitride substrate in a seamless mode to form a three-dimensional conductive path with a high aspect ratio, and therefore the graphene/boron nitride aerogel has excellent flexibility.
Furthermore, compared with the traditional chemical vapor deposition process taking methane as a carbon source, the graphene grown by using the carbon source (methanol) with the high O/C ratio hardly generates amorphous carbon, low-temperature pyrolytic carbon and other impurities, i.e. the pyrolysis of the carbon source (methanol) with the high O/C ratio is a special process for simply and stably preparing the high-purity graphene. The obtained graphene/boron nitride aerogel has the multifunctional characteristics of elasticity, heat insulation, Joule heating and the like. Specifically, the method comprises the following steps:
(1) the boron nitride aerogel is used as a matrix, so that the material has excellent heat insulation performance, and the process of thermally decomposing and growing the graphene by the high-O/C-ratio carbon source (methanol) enhances phonon/electron scattering in the heat transfer process, hinders effective heat conduction, and remarkably improves the heat insulation performance of the material. When the material is applied to a battery module material, the heat transfer between batteries can be effectively isolated, and the burning explosion problem caused by thermal runaway of the batteries is improved.
(2) After high-quality graphene is introduced, the excellent Joule heating characteristic of the material is given on the basis of enhancing the heat insulation of the boron nitride aerogel matrix. When the battery is in a low-temperature environment (less than 0 ℃), the battery heating function can be realized by applying 1.5-6V voltage to the two ends of the aerogel, the temperature environment for battery operation is ensured, and the problem of capacity attenuation of the battery caused by external low temperature is solved.
(3) The excellent elasticity enables the graphene/boron nitride aerogel to effectively relieve the shrinkage and expansion force generated in the battery charging and discharging process when the graphene/boron nitride aerogel is used as a battery module material.
(4) The aerogel material has the characteristics of heat insulation, Joule heating, elasticity and the like when being used as a battery module material, and compared with the traditional battery module aerogel material, the aerogel material can greatly reduce the production cost of the battery while improving the safety and stability of the battery.
Drawings
Fig. 1 is an optical photograph of a graphene/boron nitride aerogel prepared in example 1 of the present invention;
fig. 2 is an SEM photograph of the graphene/boron nitride aerogel prepared in example 1 of the present invention;
fig. 3 is a TEM photograph of the graphene/boron nitride aerogel prepared in example 1 of the present invention;
fig. 4 shows mechanical properties of the graphene/boron nitride aerogel prepared in example 1 of the present invention;
fig. 5 shows the thermal insulation performance of the graphene/boron nitride aerogel prepared in the embodiment 1 of the present invention;
fig. 6 is joule heating performance of the graphene/boron nitride aerogel prepared by the embodiment 1 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
The invention provides a multifunctional integrated graphene/boron nitride aerogel with heat insulation, elasticity and joule heating functions and a preparation method thereof. Specifically, the boron nitride aerogel is used as a matrix, and the graphene is uniformly grafted inside the boron nitride aerogel from inside to outside by means of a Chemical Vapor Deposition (CVD) method, so that the multifunctional aerogel integrating heat insulation, elasticity and joule heating characteristics is obtained.
The graphene/boron nitride aerogel has a three-dimensional continuous conductive network, the three-dimensional conductive network is composed of three-dimensional graphene and boron nitride, and the graphene grows on a boron nitride substrate in a seamless mode to form a three-dimensional conductive path with a high aspect ratio. Due to the adoption of the three-dimensional flexible boron nitride framework, the graphene/boron nitride aerogel has excellent flexibility.
The main elements of the graphene/boron nitride aerogel are carbon, boron, nitrogen and oxygen.
The internal microstructure of the graphene/boron nitride aerogel is a composite nanobelt structure formed by graphene and boron nitride.
The length of the composite nanobelt formed by the graphene and the boron nitride in the graphene/boron nitride aerogel is 1-900 microns.
The width of the composite nanobelt formed by the graphene and the boron nitride in the graphene/boron nitride aerogel is 50 nm-15 microns.
The density of the graphene/boron nitride aerogel is 5-80 mg/mL.
The conductivity of the graphene/boron nitride aerogel is 0.1-2.7S/cm.
The graphene/boron nitride aerogel has joule heating characteristics, namely the graphene/boron nitride aerogel can realize a heating function under the voltage holding.
The porosity of the graphene/boron nitride aerogel is 1-97%.
Specifically, the preparation method of the graphene/boron nitride aerogel provided by the invention comprises the following steps:
step 1) preparation of a melamine diborate solution:
dissolving melamine and boric acid in a co-solvent to obtain a melamine diborate solution.
And 2) carrying out freeze drying treatment on the melamine diborate solution to obtain the melamine diborate aerogel.
And 3) pyrolyzing the melamine diborate aerogel in a high-temperature atmosphere to obtain the boron nitride aerogel.
And 4) adopting a chemical vapor deposition process in the boron nitride aerogel to realize uniform grafting of the graphene on the boron nitride substrate from inside to outside so as to obtain the graphene/boron nitride aerogel.
Specifically, the method comprises the following steps:
the molar ratio of the melamine to the boric acid in the step 1) is 1: 5-5: 1.
The volume ratio of water to methanol, ethanol, isopropanol, n-butanol or tert-butanol in the cosolvent is 7: 5-9: 11.
In the step 2), a vacuum freeze drying process is selected, and the vacuum freeze drying treatment time is 12-48 hours.
In the step 3), the pyrolysis temperature is 500-2000 ℃, and the high-temperature pyrolysis time is 0.5-12 h.
The atmosphere is one or the mixture of any two of ammonia, argon and nitrogen.
In the step 4), the chemical vapor deposition process comprises the following steps:
carbon source (methanol) with high O/C ratio, and controlling the residence time of carbon source (methanol) gas in the boron nitride aerogel by adopting a chemical vapor deposition pump. The rate of the chemical vapor deposition pump is 20-70%. The pressure in the chemical vapor deposition furnace is 5-20 kPa. The growth temperature of the graphene is 850-1150 ℃, the growth time of the graphene is 1-10 h, and the graphene content in the graphene/boron nitride aerogel is 10-35% of the total amount of the graphene/boron nitride aerogel.
In conclusion, the multifunctional integrated graphene/boron nitride aerogel prepared by the invention has excellent elasticity and heat insulation performance, and also has joule heating property, so that the normal working temperature environment of the battery can be maintained after the voltage of 1.5-6V is applied, and the problem of low-temperature capacity attenuation of the battery is solved. The production cost of the battery can be greatly reduced while the safety and the stability of the battery are improved. It is expected to be applied to battery module materials.
The technical scheme of the invention is further explained in detail by a plurality of embodiments and the accompanying drawings.
Example 1:
0.4838g of melamine and 0.4762g of boric acid are weighed and added into 48mL of tert-butyl alcohol/distilled water cosolvent in turn, wherein the proportion of tert-butyl alcohol to distilled water is 7:5, the concentration of the mixed solution is 20 mg/mL. And (3) obtaining a melamine diboronic acid solution, transferring the melamine diboronic acid solution to a vacuum freeze dryer for treatment for 24 hours, and obtaining the melamine diboronic acid aerogel.
And transferring the melamine diboronic acid aerogel into a tube furnace, heating to 1100 ℃ in an ammonia/nitrogen environment, and carrying out high-temperature heat treatment for 3h to obtain the boron nitride aerogel.
And placing the obtained boron nitride aerogel in a chemical vapor deposition furnace, controlling the residence time of the carbon source gas in the boron nitride aerogel by using a chemical vapor deposition pump with adjustable speed, and immediately adjusting the speed of the chemical vapor deposition pump to be 60% after the sample is placed in the furnace cavity. The graphene growth temperature is 1050 ℃, after the temperature is raised to the target temperature, the speed of the chemical vapor deposition pump is adjusted to be 20%, the pressure in the furnace is adjusted to be 5-20 kPa by opening the air inlet valve, and graphene is grown for 2 hours on the basis. Obtaining the graphene/boron nitride aerogel; the graphene/boron nitride aerogel contains 15% of graphene by weight.
4. The test result shows that: the thermal conductivity can reach 0.045W/m.k, the electric conductivity is 0.45S/cm, and the density is 25mg/cm 3. As can be seen from fig. 1, the graphene/boron nitride aerogel can be prepared in large quantities. As can be seen from fig. 2 and 3, in the prepared graphene/boron nitride aerogel microstructure, graphene uniformly grows inside boron nitride from inside to outside. As can be seen from fig. 4, the graphene/boron nitride aerogel has excellent elasticity. As can be seen from fig. 5, the graphene/boron nitride aerogel has excellent thermal insulation properties. As can be seen from fig. 6, the graphene/boron nitride aerogel has joule heating characteristics.
Example 2:
0.2419g of melamine and 0.2381g of boric acid are weighed and added into 48mL of tert-butyl alcohol/distilled water cosolvent in turn, wherein the proportion of tert-butyl alcohol to distilled water is 7:5, the concentration of the mixed solution is 10 mg/mL. And (3) obtaining a melamine diboronic acid solution, transferring the melamine diboronic acid solution to a vacuum freeze dryer for treatment for 24 hours, and obtaining the melamine diboronic acid aerogel.
And transferring the melamine diboronic acid aerogel into a tube furnace, heating to 1100 ℃ in an ammonia/nitrogen environment, and carrying out high-temperature heat treatment for 3h to obtain the boron nitride aerogel.
And placing the obtained boron nitride aerogel in a chemical vapor deposition furnace, controlling the residence time of the carbon source gas in the boron nitride aerogel by using a chemical vapor deposition pump with adjustable speed, and immediately adjusting the speed of the chemical vapor deposition pump to be 60% after the sample is placed in the furnace cavity. The graphene growth temperature is 1050 ℃, after the temperature is raised to the target temperature, the rate of the chemical vapor deposition pump is adjusted to be 20%, the pressure in the furnace is adjusted to be 5-20 kPa by opening the air inlet valve, and graphene is grown for 2 hours on the basis. And obtaining the graphene/boron nitride aerogel, wherein the graphene content in the graphene/boron nitride aerogel is 20% of the total amount of the graphene/boron nitride aerogel.
The test result shows that: the thermal conductivity value is 0.035W/m.k, the electrical conductivity is 0.65S/cm, the density is 15mg/cm3, and the mechanical property is stable.
Example 3:
0.4838g of melamine and 0.4762g of boric acid are weighed and added into 48mL of tert-butyl alcohol/distilled water cosolvent in turn, wherein the proportion of tert-butyl alcohol to distilled water is 7:5, the concentration of the mixed solution is 20 mg/mL. And (3) obtaining a melamine diboronic acid solution, transferring the melamine diboronic acid solution to a vacuum freeze dryer for treatment for 24 hours, and obtaining the melamine diboronic acid aerogel.
And transferring the melamine diboronic acid aerogel into a tube furnace, heating to 1100 ℃ in an ammonia/nitrogen environment, and carrying out high-temperature heat treatment for 3h to obtain the boron nitride aerogel.
And placing the obtained boron nitride aerogel in a chemical vapor deposition furnace, controlling the residence time of the carbon source gas in the boron nitride aerogel by using a chemical vapor deposition pump with adjustable speed, and immediately adjusting the speed of the chemical vapor deposition pump to be 60% after the sample is placed in the furnace cavity. The graphene growth temperature is 1050 ℃, after the temperature is raised to the target temperature, the speed of the chemical vapor deposition pump is adjusted to be 20%, the pressure in the furnace is adjusted to be 5-20 kPa by opening the air inlet valve, and the graphene is grown for 4 hours on the basis. And obtaining the graphene/boron nitride aerogel, wherein the graphene content in the graphene/boron nitride aerogel is 27% of the total amount of the graphene/boron nitride aerogel.
The test result shows that: the thermal conductivity value is 0.025W/m.k, the electrical conductivity is 0.84S/cm, the density is 30mg/cm3, and the mechanical property is stable.
Example 4:
0.4838g of melamine and 0.4762g of boric acid are weighed and added into 48mL of tert-butyl alcohol/distilled water cosolvent in turn, wherein the proportion of tert-butyl alcohol to distilled water is 7:5, the concentration of the mixed solution is 20 mg/mL. And (3) obtaining a melamine diboronic acid solution, transferring the melamine diboronic acid solution to a vacuum freeze dryer for treatment for 24 hours, and obtaining the melamine diboronic acid aerogel.
And transferring the melamine diboronic acid aerogel into a tubular furnace, and heating to 1100 ℃ in an ammonia/nitrogen environment to perform high-temperature heat treatment for 3 hours to obtain the boron nitride aerogel.
And placing the obtained boron nitride aerogel in a chemical vapor deposition furnace, controlling the retention time of the carbon source gas in the boron nitride aerogel by using a speed-adjustable chemical vapor deposition pump, and immediately adjusting the speed of the chemical vapor deposition pump to be 60% after the sample is placed in a furnace cavity. The graphene growth temperature is 1050 ℃, after the temperature is raised to the target temperature, the speed of the chemical vapor deposition pump is adjusted to be 20%, the pressure in the furnace is adjusted to be 5-20 kPa by opening the air inlet valve, and graphene is grown for 6 hours on the basis. And obtaining the graphene/boron nitride aerogel, wherein the graphene content in the graphene/boron nitride aerogel is 35% of the total amount of the graphene/boron nitride aerogel.
The test result shows that: the thermal conductivity value is 0.025W/m.k, the electrical conductivity is 1.8S/cm, the density is 40mg/cm3, and the mechanical property is stable.

Claims (9)

1. The preparation method of the graphene/boron nitride aerogel is characterized by comprising the following steps:
carrying out pyrolysis treatment on the melamine diborate aerogel to obtain boron nitride aerogel;
and (3) taking the boron nitride aerogel as a matrix, and depositing graphene on the matrix by using a chemical vapor deposition method to obtain the graphene/boron nitride aerogel.
2. The preparation method of the graphene/boron nitride aerogel according to claim 1, wherein the preparation method of the melamine diborate aerogel comprises the following steps:
dissolving melamine and boric acid in a cosolvent, and fully stirring to obtain a melamine diborate solution, wherein the molar ratio of the melamine to the boric acid is 1: 5-5: 1;
the cosolvent comprises water and methanol, ethanol, isopropanol, n-butyl alcohol or tert-butyl alcohol, wherein the volume ratio of the water to the methanol, the ethanol, the isopropanol, the n-butyl alcohol or the tert-butyl alcohol is 7: 5-9: 11;
and (3) carrying out freeze drying treatment on the melamine diborate solution to obtain the melamine diborate aerogel.
3. The preparation method of the graphene/boron nitride aerogel according to claim 2, wherein the freeze-drying treatment is performed under the following process conditions:
the vacuum freeze drying treatment time is 12-48 h.
4. The preparation method of the graphene/boron nitride aerogel according to claim 1, wherein the specific process for obtaining the boron nitride aerogel by carrying out pyrolysis treatment on the melamine diborate aerogel is as follows:
carrying out pyrolysis in a high-temperature atmosphere, wherein the pyrolysis temperature is 500-2000 ℃; the pyrolysis time is 0.5-12 h.
5. The preparation method of the graphene/boron nitride aerogel according to claim 4, wherein the high-temperature atmosphere is one or a mixture of any two of ammonia, argon and nitrogen.
6. The preparation method of the graphene/boron nitride aerogel according to claim 1, wherein the graphene is deposited on the substrate by a chemical vapor deposition method, and the specific process comprises the following steps:
the carbon source with the high O/C ratio is used as the carbon source, and the graphene content in the graphene/boron nitride aerogel is 10-35% of the total amount of the graphene/boron nitride aerogel.
7. A graphene/boron nitride aerogel, which is prepared by the preparation method of any one of claims 1 to 6.
8. The graphene/boron nitride aerogel according to claim 7, wherein the graphene/boron nitride aerogel is a composite nanobelt structure.
9. The graphene/boron nitride aerogel according to claim 8, wherein the length of the composite nanobelt structure is 1 μm to 900 μm; the width is 50 nm-15 μm.
CN202210196120.8A 2022-02-28 2022-02-28 Graphene/boron nitride aerogel and preparation method thereof Pending CN114597560A (en)

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* Cited by examiner, † Cited by third party
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