CN114715875A - Preparation method of thin-layer carbon-based material and application of thin-layer carbon-based material as battery material - Google Patents
Preparation method of thin-layer carbon-based material and application of thin-layer carbon-based material as battery material Download PDFInfo
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- CN114715875A CN114715875A CN202210353650.9A CN202210353650A CN114715875A CN 114715875 A CN114715875 A CN 114715875A CN 202210353650 A CN202210353650 A CN 202210353650A CN 114715875 A CN114715875 A CN 114715875A
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- 239000003575 carbonaceous material Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000000463 material Substances 0.000 title abstract description 23
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 63
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims abstract description 54
- 229920000877 Melamine resin Polymers 0.000 claims abstract description 30
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract description 30
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000010426 asphalt Substances 0.000 claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 18
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 15
- 239000010431 corundum Substances 0.000 claims abstract description 15
- 239000011259 mixed solution Substances 0.000 claims abstract description 15
- 238000000227 grinding Methods 0.000 claims abstract description 12
- NPYPAHLBTDXSSS-UHFFFAOYSA-N Potassium ion Chemical compound [K+] NPYPAHLBTDXSSS-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000000137 annealing Methods 0.000 claims abstract description 9
- 229910001414 potassium ion Inorganic materials 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052786 argon Inorganic materials 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000005245 sintering Methods 0.000 claims abstract description 4
- 238000005303 weighing Methods 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 9
- 238000001704 evaporation Methods 0.000 claims description 6
- 239000007773 negative electrode material Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000003763 carbonization Methods 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 3
- 239000003208 petroleum Substances 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 7
- 238000010000 carbonizing Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 239000010406 cathode material Substances 0.000 abstract description 3
- 238000002474 experimental method Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000010923 batch production Methods 0.000 abstract 1
- 238000003760 magnetic stirring Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 29
- 238000010438 heat treatment Methods 0.000 description 21
- 229910021389 graphene Inorganic materials 0.000 description 3
- 238000001237 Raman spectrum Methods 0.000 description 2
- 238000003917 TEM image Methods 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- IUHFWCGCSVTMPG-UHFFFAOYSA-N [C].[C] Chemical group [C].[C] IUHFWCGCSVTMPG-UHFFFAOYSA-N 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000002498 deadly effect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000000634 powder X-ray diffraction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
-
- 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
- H01M4/36—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
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
-
- 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- 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 application provides a preparation method of a thin-layer carbon base and application of the thin-layer carbon base as a potassium ion battery cathode material, in the invention, a certain amount of melamine and ammonium chloride are fully ground and then dispersed in N, N-dimethylformamide with a certain volume, a proper amount of asphalt is added, magnetic stirring is carried out to obtain an earthy yellow mixed solution, then the N, N-dimethylformamide is evaporated to dryness in a water bath, and the asphalt-coated melamine and ammonium chloride powder is obtained by grinding; and transferring the obtained powder into a corundum crucible, then transferring into a tubular furnace, sintering, annealing and carbonizing under the protection of argon, and naturally cooling to room temperature to obtain the black ultrathin wrinkled thin-layer carbon-based material. Electrochemical experiments prove that the carbon-based material prepared by the method has application prospect as a potassium ion battery cathode material. The material of the invention has simple preparation process, easy operation, low cost of raw materials and less equipment investment, and is suitable for batch production.
Description
Technical Field
The application relates to the technical field of material chemical energy sources, in particular to a preparation method of a thin-layer carbon-based material and application of the thin-layer carbon-based material as a battery material.
Background
Among the numerous negative electrode materials, carbon-based materials have been of great interest in alkaline ion battery applications. The main advantages of carbon-based materials are large abundance, tunable interlayer spacing and structural properties. However, the volume expansion effect, conductivity, safety, etc. have been the deadly shortboards of carbon-based materials in potassium ion battery applications. Therefore, among the conventional modification methods for carbon-based materials are: 1. carbon-carbon atom structure regulation (Advanced Materials,2018,30(48): 1802104); 2. carbon micro-nano structure regulation (Advanced Energy Materials,2020: 2000808); 3. heterojunction coupling regulation, etc. (ACS Energy Letters, 2020). The fact proves that carbon and allotrope thereof are a kind of material with very high application value, and especially the application of graphitized carbon material in lithium ion battery is known as one of the most important inventions since 20 century. But the production process of graphene is complex and expensive. The current research shows that the shape of the product is controlled by solid-phase reaction and by means of the self composition structure of the material, and the thickness and the wrinkle degree of the material are regulated and controlled by controlling the mass ratio of the material precursor to the product material precursor. The ultrathin graphene-like laminated structure can inhibit the volume expansion effect of the material caused in the potassium ion de-intercalation process, and simultaneously increase the contact area of the electrode material and the electrolyte and shorten the migration distance of the electrolyte, so that the ultrathin graphene-like laminated structure has great application prospect in the aspect of battery materials.
Disclosure of Invention
In view of the above, the present application aims to provide a method for preparing a thin-layer carbon-based material and its use as a battery material.
In view of the above, the first aspect of the present application provides a method for preparing a thin-layer carbon-based material, which uses melamine and asphalt as main raw materials, and adds a proper amount of ammonium chloride (NH)4Cl) is used as a regulator, N-Dimethylformamide (DMF) is used as a solvent, the mixture is evaporated to dryness by a water bath at 90 ℃, and then sintering, annealing and carbonization are carried out at 1100 ℃ to obtain the thin-layer carbon-based material, wherein the method specifically comprises the following steps:
1) weighing a certain amount of melamine (C)3H6N6) And ammonium chloride (NH)4Cl) is ground for 1 hour to be fully mixed, then the mixture is dispersed into DMF solution and stirred for 30min to obtain milky mixed solution;
2) weighing a certain amount of asphalt, adding the asphalt into the mixed solution, magnetically stirring for 6 hours, evaporating DMF (dimethyl formamide) in a water bath at 90 ℃, and grinding to obtain powder of melamine and ammonium chloride wrapped by the asphalt;
3) and placing the obtained powder into a corundum crucible, then transferring the corundum crucible into a tubular furnace, carrying out programmed temperature control sintering annealing carbonization under the protection of argon, and naturally cooling to room temperature to obtain a black ultrathin wrinkled thin-layer carbon-based material, namely the thin-layer carbon-based material.
Further, the mass ratio of substances in the powder material is melamine: ammonium chloride ═ 4: 1, melamine + ammonium chloride: 10-50% of asphalt: 1.
further, the melamine and ammonium chloride species are both chemically pure.
Further, the asphalt is petroleum asphalt purchased in the market.
Based on the same inventive concept, the second aspect of the present application provides a thin-layer carbon-based material prepared by the preparation method of the first aspect.
Based on the same inventive concept, the third aspect of the application provides the use of a thin-layer carbon-based material as a negative electrode material of a potassium ion battery, wherein the material is used as the negative electrode material of the potassium ion battery and the amount of the thin-layer carbon-based material is 1000mA g-1The specific discharge capacity is kept at 147.6mAh g after 1800 times of charge-discharge circulation under the current density of (1)-1Above, the coulombic efficiency was above 99.6%.
From the above, it can be seen that the specific combination of melamine, asphalt, ammonium chloride and DMF and the preparation process parameters used in the present invention play a key role in the morphology and the composition structure of the prepared thin-layer carbon-based material, so that the prepared material has a specific raman absorption spectrum, the prepared thin-layer carbon-based material has specific electrochemical parameters, and the specific surface of the prepared thin-layer carbon-based material has 141.23m2 g-1The morphology of the material is in a graphene sheet layer with ultrathin wrinkles, and the prepared thin-layer carbon-based material is prepared at 1000mA g-1The specific discharge capacity is kept at 147.6mAh g after 1800 times of charge-discharge circulation under the current density of (1)-1Above, the coulombic efficiency is above 99.6%.
Drawings
In order to more clearly illustrate the technical solutions in the present application or the related art, the drawings needed to be used in the description of the embodiments or the related art will be briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 shows N of a thin carbon-based material prepared in example of the present application2Adsorption and desorption curve graphs;
FIG. 2 is an SEM image of a thin layer carbon-based material prepared in an example of the present application;
FIG. 3 is a TEM image of a thin carbon-based material prepared in example of the present application;
FIG. 4 is another TEM image of a thin layer carbon-based material prepared in example of the present application;
fig. 5 is an XRD pattern of the thin layer carbon-based material prepared in the example of the present application;
fig. 6 is a raman spectrum of the thin carbon-based material prepared in the example of the present application;
fig. 7 is a schematic view of charge-discharge cycle performance of the thin-layer carbon-based material prepared in the example of the present application as a negative electrode of a potassium ion battery.
Detailed Description
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
It is to be noted that, unless otherwise defined, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
Example 1
Weighing melamine (8.0g) and ammonium chloride (2.0g), grinding for 1h to fully mix the melamine and the ammonium chloride, then dispersing the melamine and the ammonium chloride into 100mL of N, N-dimethylformamide, and stirring for 30min to obtain a milky mixed solution; weighing asphalt (1.0g), adding into the mixed solution, magnetically stirring for 6h, then steaming out N, N-dimethylformamide in a water bath at 90 ℃, and grinding to obtain asphalt-coated melamine and ammonium chloride powder; will be provided withTransferring the obtained powder into a corundum crucible, transferring the corundum crucible into a tubular furnace, and performing argon protection at the temperature of 2 ℃ for min-1Heating to 600 deg.C, maintaining for 2h, and heating at 4 deg.C for min-1Heating to 800 deg.C, maintaining for 2h, and keeping at 5 deg.C for min-1Heating to 1100 ℃, preserving the heat for 3h, annealing and carbonizing, and naturally cooling to room temperature to obtain the black ultrathin wrinkled thin-layer carbon-based material.
Example 2
Weighing melamine (16.0g) and ammonium chloride (4.0g), grinding for 1h to fully mix the melamine and the ammonium chloride, then dispersing the melamine and the ammonium chloride into 200mL of N, N-dimethylformamide, and stirring for 30min to obtain a milky mixed solution; weighing asphalt (1.0g), adding into the mixed solution, magnetically stirring for 6h, evaporating N, N-dimethylformamide to dryness in a water bath at 90 ℃, and grinding to obtain asphalt-coated melamine and ammonium chloride powder; transferring the obtained powder into a corundum crucible, transferring the corundum crucible into a tubular furnace, and performing argon protection for 2 ℃ for min-1Heating to 600 deg.C, maintaining for 2 hr, and heating at 4 deg.C for min-1Heating to 800 deg.C, maintaining for 2h, and keeping at 5 deg.C for min-1Heating to 1100 ℃, preserving the heat for 3h, annealing and carbonizing, and naturally cooling to room temperature to obtain the black ultrathin wrinkled thin-layer carbon-based material.
Example 3
Weighing melamine (24.0g) and ammonium chloride (6.0g), grinding for 1h to fully mix, then dispersing into 300ml of N, N-dimethylformamide, and stirring for 30min to obtain a milky mixed solution; weighing asphalt (1.0g), adding into the mixed solution, magnetically stirring for 6h, then evaporating N, N-dimethylformamide in a water bath at 90 ℃, and grinding to obtain asphalt-coated melamine and ammonium chloride powder; transferring the obtained powder into a corundum crucible, transferring the corundum crucible into a tubular furnace, and performing argon protection for 2 min-1Heating to 600 deg.C, maintaining for 2h, and heating at 4 deg.C for min-1Heating to 800 deg.C, maintaining for 2h, and keeping at 5 deg.C for min-1Heating to 1100 ℃, preserving the heat for 3h, annealing and carbonizing, and naturally cooling to room temperature to obtain the black ultrathin wrinkled thin-layer carbon-based material.
Example 4
Melamine (32.0g) and ammonium chloride (8.0g) were weighed, ground for 1h to mix well, then dispersed in 300ml of N, N-dimethylformamide and stirred 30min to obtain milky mixed solution; weighing asphalt (1.0g), adding into the mixed solution, magnetically stirring for 6h, evaporating N, N-dimethylformamide to dryness in a water bath at 90 ℃, and grinding to obtain asphalt-coated melamine and ammonium chloride powder; transferring the obtained powder into a corundum crucible, transferring the corundum crucible into a tubular furnace, and performing argon protection for 2 ℃ for min-1Heating to 600 deg.C, maintaining for 2h, and heating at 4 deg.C for min-1Heating to 800 deg.C, holding for 2 hr, and heating at 5 deg.C for min-1Heating to 1100 ℃, preserving the heat for 3h, annealing and carbonizing, and naturally cooling to room temperature to obtain the ultra-black thin-folded thin-layer carbon-based material.
Example 5
Weighing melamine (40.0g) and ammonium chloride (10.0g), grinding for 1h to fully mix the melamine and the ammonium chloride, then dispersing the melamine and the ammonium chloride into 300ml of N, N-dimethylformamide, and stirring for 30min to obtain a milky mixed solution; weighing asphalt (1.0g), adding into the mixed solution, magnetically stirring for 6h, evaporating N, N-dimethylformamide to dryness in a water bath at 90 ℃, and grinding to obtain asphalt-coated melamine and ammonium chloride powder; transferring the obtained powder into a corundum crucible, transferring the corundum crucible into a tubular furnace, and performing argon protection for 2 min-1Heating to 600 deg.C, maintaining for 2h, and heating at 4 deg.C for min-1Heating to 800 deg.C, maintaining for 2h, and keeping at 5 deg.C for min-1Heating to 1100 ℃, preserving the heat for 3h, annealing and carbonizing, and naturally cooling to room temperature to obtain the black ultrathin wrinkled thin-layer carbon-based material.
The following are the measurements of the morphology and electrochemical performance parameters of the material:
the thin-layer carbon-based materials prepared in examples 1 to 5 were tested for specific surface and pore structure structures using a specific surface adsorption apparatus (fig. 1); observing the morphology of the material by using a scanning electron microscope (SEM, figure 2) and a transmission scanning electron microscope (TEM, figures 3 and 4), wherein the result shows that the material has an ultrathin folded graphene lamellar structure, and the thickness of a lamellar layer is about 60 nm; the compositional structure of the material was measured using a powder X-ray diffraction (XRD) spectrometer and showed a strong absorption peak at 25.63 degrees (fig. 5); raman spectrum test shows that the intensity of the light is 1350cm-1And 1585cm-1Two strong absorption peaks (fig. 6);
the prepared thin-layer carbon-based material is used as a potassium ion battery cathode material for carrying out electrochemical performance measurementTest shows that the electrochemical performance test is at 1000mA g-1The specific discharge capacity is kept at 147.6mAh g after 1800 times of charge-discharge circulation under the current density of (1)-1Above, the coulombic efficiency was 99.6% or more (fig. 7).
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the present disclosure, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of brevity.
The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalents, improvements, and the like that may be made within the spirit and principles of the embodiments of the disclosure are intended to be included within the scope of the disclosure.
Claims (3)
1. A preparation method of a thin-layer carbon-based material is characterized by comprising the following steps:
1) weighing a certain amount of melamine (C)3H6N6) And ammonium chloride (NH)4Cl) is ground for 1 hour to be fully mixed, then the mixture is dispersed into N, N-Dimethylformamide (DMF) solution with certain volume and stirred for 30min to obtain milky mixed solution;
2) weighing a certain amount of asphalt, adding the asphalt into the mixed solution, magnetically stirring for 6 hours, evaporating DMF (dimethyl formamide) in a water bath at 90 ℃, and grinding to obtain powder of melamine and ammonium chloride wrapped by the asphalt;
3) placing the obtained powder into a corundum crucible, then transferring the corundum crucible into a tubular furnace to carry out programmed temperature control sintering annealing carbonization under the protection of argon, and naturally cooling to room temperature to obtain a black ultrathin wrinkled thin-layer carbon-based material, namely the thin-layer carbon-based material;
the mass ratio of substances in the powder is melamine: ammonium chloride ═ 4: 1, melamine + ammonium chloride: 10-50% of asphalt: 1;
the melamine and ammonium chloride substances are both chemically pure;
the asphalt is petroleum asphalt purchased from the market.
2. A thin-layer carbon-based material, characterized by being prepared by the preparation method of claim 1.
3. Use of a thin-layer carbon-based material, characterized in that the thin-layer carbon-based material prepared according to claim 1 is used as a negative electrode material of a potassium ion battery at 1000mA g-1The specific discharge capacity is kept at 147.6mAh g after 1800 times of charge-discharge circulation under the current density of (1)-1Above, the coulombic efficiency is above 99.6%.
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| CN116462183A (en) * | 2023-03-10 | 2023-07-21 | 中国科学院宁波材料技术与工程研究所 | Soft carbon material with diatomite-like structure and preparation method and application thereof |
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