CN116947018A - Porous carbon material doped with zinc monoatoms in pore confinement, preparation method of porous carbon material and application of porous carbon material as anode material of lithium ion capacitor - Google Patents
Porous carbon material doped with zinc monoatoms in pore confinement, preparation method of porous carbon material and application of porous carbon material as anode material of lithium ion capacitor Download PDFInfo
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- 239000011148 porous material Substances 0.000 title claims abstract description 51
- 239000003575 carbonaceous material Substances 0.000 title claims abstract description 48
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 44
- 239000011701 zinc Substances 0.000 title claims abstract description 44
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 22
- 239000003990 capacitor Substances 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000010405 anode material Substances 0.000 title abstract description 7
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 19
- 235000005074 zinc chloride Nutrition 0.000 claims abstract description 12
- 239000011592 zinc chloride Substances 0.000 claims abstract description 12
- 229920002239 polyacrylonitrile Polymers 0.000 claims abstract description 7
- 239000007774 positive electrode material Substances 0.000 claims abstract description 7
- 239000007864 aqueous solution Substances 0.000 claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 19
- 239000002002 slurry Substances 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000002243 precursor Substances 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 239000011888 foil Substances 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 239000006230 acetylene black Substances 0.000 claims description 4
- 239000012298 atmosphere Substances 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 238000003763 carbonization Methods 0.000 abstract description 7
- 239000007772 electrode material Substances 0.000 abstract description 2
- 239000003960 organic solvent Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000000840 electrochemical analysis Methods 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 description 15
- 125000004429 atom Chemical group 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000004075 alteration Effects 0.000 description 3
- 150000001450 anions Chemical class 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 2
- 229910003481 amorphous carbon Inorganic materials 0.000 description 2
- 238000000231 atomic layer deposition Methods 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 239000002803 fossil fuel Substances 0.000 description 2
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012621 metal-organic framework Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 239000003495 polar organic solvent Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000012190 activator Substances 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010277 constant-current charging Methods 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 238000001212 derivatisation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- 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
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
- H01G11/34—Carbon-based characterised by carbonisation or activation of carbon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
- H01G11/44—Raw materials therefor, e.g. resins or coal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/50—Electrodes characterised by their material specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation
-
- 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
- Y02E60/13—Energy storage using capacitors
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Materials Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The application relates to the field of electrode materials of lithium ion capacitors, and provides a porous carbon material doped with zinc monoatoms in a pore confinement region, a preparation method thereof and application of the porous carbon material as an anode material of a lithium ion capacitor. The porous carbon material has a particle size of 800-1300m 2 g ‑1 High specific surface area and pore size of 2-5nm, wherein zinc monoatoms are uniformly doped in the pore canal. The preparation method adopts a simple green method, takes polyacrylonitrile and zinc chloride aqueous solution as raw materials, and obtains the zinc single-atom doped porous carbon material through carbonization. In electrochemical tests, the porous carbon material shows excellent electrochemical performance as a positive electrode material of a lithium ion capacitorCan have high specific capacity and long cycle stability. The method is simple and environment-friendly, avoids using organic solvents, and has important application value.
Description
Technical Field
The application relates to the field of electrode materials of lithium ion capacitors, in particular to a porous carbon material doped with zinc monoatoms in a pore confinement region, a preparation method thereof and application of the porous carbon material as an anode material of a lithium ion capacitor.
Background
With the combustion of fossil fuels and the exhaustion of resources, new renewable energy sources that replace fossil fuels are being sought. The requirements on the renewable energy storage system are continuously improved, and the lithium ion capacitor is used as a novel energy storage device, combines the advantages of a lithium ion battery and a super capacitor, and has excellent performances such as high power density, high energy density, long-cycle stability and the like.
However, the lithium ion capacitor suffers from the problem that the slow intercalation/deintercalation kinetics of the negative electrode material are not matched with the rapid adsorption/desorption behavior of the positive electrode. At present, active carbon is mainly used as a positive electrode material of a lithium ion capacitor, and a large number of micropores of the active carbon are unfavorable for adsorption of electrolyte ions although the active carbon has a large specific surface area, so that a proper porous carbon material needs to be prepared to improve the specific capacity of the positive electrode material.
Research shows that when metal monoatoms are introduced into the carbon material, compared with nonmetallic heteroatoms (such as N, P, S and the like) and metal particles, the metal monoatoms have high atom utilization rate, selectivity and better local electron density regulating capability, and have high affinity to anions, so that the adsorption energy is effectively increased. In addition, the porous carbon positive electrode material must have a pore size distribution of a small mesoporous structure of 2 to 5nm in order to achieve effective storage of anions. Therefore, metal monoatoms are limited in small and medium pore channels of the porous carbon, and the porous carbon material doped with the pore-limited metal monoatoms can effectively promote the storage capacity of anions. Currently, metal monoatomic doped carbon materials are applied to the negative electrode of a lithium ion capacitor, but related researches on the positive electrode of the lithium ion capacitor are not reported.
Currently, metal monatomic doped porous carbon preparation methods mainly comprise a Metal Organic Frameworks (MOFs) derivatization method, a direct pyrolysis method, a Chemical Vapor Deposition (CVD) auxiliary method, an Atomic Layer Deposition (ALD) auxiliary method, an atomic substitution method and the like. However, these methods have difficulty in effectively confining the metal monoatoms in small and medium pore channels, and generally require complicated experimental conditions, equipment and synthesis parameters, resulting in high production costs, and difficulty in mass production. In addition, the method often uses polar organic solvents such as methanol, furfural, N-Dimethylformamide (DMF) and the like, and causes great harm to the surrounding environment and human health. Therefore, it is an important problem to find a simple and environment-friendly method for preparing porous carbon materials doped with single atoms of zinc in the pore-limiting domain.
Disclosure of Invention
The application aims to provide a porous carbon material doped with zinc monoatoms in a pore confinement region. The material has a particle size of 800-1300m 2 g -1 High specific surface area and pore size of 2-5nm, and zinc monoatoms are uniformly doped in the pore canal.
The application further aims to provide a preparation method of the porous carbon material doped with the single atoms of the zinc in the pore confinement region. The application adopts a simple green method to prepare the porous carbon material doped with the single atom of the zinc in the pore-limited domain. The polyacrylonitrile and zinc chloride aqueous solution are used as raw materials, and the porous carbon material doped with zinc monoatoms is obtained through carbonization. The polyacrylonitrile can be dissolved in the zinc chloride aqueous solution, so that the use of an organic solvent is avoided. The zinc chloride can be used as an activator to react with polyacrylonitrile to form porous carbon, and can also be used as a doping agent to form a porous carbon material doped with pore-limited zinc monoatoms. The preparation method comprises the following steps:
step one: and (3) dissolving polyacrylonitrile in zinc chloride aqueous solutions with different contents, and carrying out a reaction by heating and stirring to obtain a sol-like precursor.
Step two: and (3) putting the obtained sol precursor into a tube furnace, gradually heating to 280 ℃ in an air environment, and performing pre-oxidation for 3 hours. Then heating to 700-1000 ℃ gradually under inert atmosphere, and preserving heat for 1-5 hours. Finally, hydrochloric acid is used for washing away impurities to obtain the zinc monoatomic doped porous carbon material.
The inert atmosphere selected in the second step comprises nitrogen and argon.
Another object of the application is to provide the use of a porous carbon material doped with single atoms of zinc in a pore confinement region as a positive electrode material in a lithium ion capacitor. The application comprises the following steps: firstly, porous carbon material doped with zinc monoatoms in a pore confinement region, acetylene black and a binder are mixed according to the mass ratio of 8:1:1 into slurry. The slurry was then coated on aluminum foil and dried in a vacuum oven at 120 ℃ for 12 hours. Finally, the electrode sheet was cut into a disk having a diameter of 1.2 cm.
Compared with the prior art, the application has the following advantages:
1. the preparation method is simple and environment-friendly, avoids using polar organic solvents, and is beneficial to reducing the harm to the surrounding environment and human health.
2. The porous carbon material doped with the zinc monoatoms in the pore limit area has high specific surface area and average pore size, and the zinc monoatoms are uniformly distributed in the pore canal, so that excellent ion storage capacity is provided for the positive electrode of the lithium ion capacitor.
3. The porous carbon material prepared by the application has important application value in the aspect of lithium ion capacitor anode materials.
Drawings
FIG. 1 is a graph showing the specific surface area and pore distribution of a porous carbon material doped with zinc monoatomic in a pore confinement region.
FIG. 2 is a transmission electron microscope image of a porous carbon material doped with a single atom of zinc in a pore confinement region.
FIG. 3 is a spherical aberration electron microscope image of a porous carbon material doped with a single atom of zinc in a pore confinement region.
Fig. 4 is a graph of charge and discharge curves of a pore confinement zinc monoatomically doped porous carbon material at different current densities in a positive half cell of a lithium ion capacitor.
The application is described in detail below with reference to the attached drawings and examples:
example 1
25 g of zinc chloride was dissolved in 10 ml of deionized water to form a zinc chloride solution. Then, 1 g of polyacrylonitrile was slowly added to the zinc chloride solution, and the mixture was heated and stirred in a water bath at 50℃at a rotation speed of 300 rpm, and the reaction was continued for 5 hours to obtain a sol-like precursor.
The precursor obtained was placed in a carbonization furnace, heated to 280℃in air at a heating rate of 5℃per minute, and pre-oxidized for 3 hours. Then, the temperature was raised to 800℃at a temperature rise rate of 5℃per minute under the protection of a nitrogen atmosphere, and carbonization was carried out for 2 hours. The resulting sample was pickled with hydrochloric acid and then suction filtered with deionized water. And (3) drying the sample subjected to suction filtration in an oven to obtain the porous carbon material doped with the zinc monoatoms in the pore limiting region. As shown in figure 1, the porous carbon material with zinc monoatomic doped in the pore confinement region has specific surface area and pore distribution diagramThe pore diameter of the material is concentrated and distributed at 3.6nm, and the specific surface area is 1143.43m 2 g -1 The porous carbon material is shown to have a high specific surface area. The transmission electron microscope image shown in fig. 2 shows that the obtained carbon material is amorphous carbon and contains a large number of randomly distributed pores. As shown in fig. 3, which is a spherical aberration electron microscope, zinc monoatoms are uniformly distributed in the pores.
The porous carbon material doped with the single atom of the zinc with the pore restriction domain prepared in the example 1 was used as a positive electrode material of a lithium ion capacitor, and the electrochemical performance thereof was tested. The composite material consists of the following components in percentage by mass: firstly, porous carbon material doped with single atoms of zinc in a pore confinement region is acetylene black, and the mass ratio of the binder is 8:1:1 into slurry. The slurry was then coated on aluminum foil and dried in a vacuum oven at 120 ℃ for 12 hours. Finally, the electrode plate is cut into a circular plate with the diameter of 1.2 cm. The porous carbon material doped with the single atom of the zinc in the pore confinement region is used as the anode material of the lithium ion capacitor at 100mA g -1 Can reach 130mAh g under the current density of (2) -1 Even at 10Ag -1 Remains 95mAh g at high current density -1 Exhibits excellent electrochemical properties.
As shown in the BET graph of FIG. 1, a specific surface area of 1143.43m was obtained 2 g -1 . As shown in a transmission electron microscope chart of fig. 2, the obtained carbon material amorphous carbon contains a large number of randomly distributed pores. As shown in the spherical aberration diagram of fig. 3, zinc monoatoms are uniformly distributed in the pores.
Half cell performance tests were performed using the metal monatomic doped porous carbon prepared in example 1 as an active material. Constant current charging and discharging are carried out on a blue electric tester. As shown in figure 4, the material is used as a negative electrode material of a lithium ion battery at 100mAg -1 130mAh g can be obtained at a current density of (3) -1 Even at 10Ag -1 Remains 95mAh g at a current density of (C) -1 Exhibits good electrochemical properties.
Example 2:
the procedure is as in example 1, except that 30 g of zinc chloride are added to give a pore sizeDomain zinc monoatomic doped porous carbon with a specific surface area of 1260m 2 g -1 The average pore size was 4 nm.
Example 3:
the procedure was the same as in example 1, except that 20 g of zinc chloride was added to obtain a porous carbon doped with zinc monoatoms in the pore-limited region, the specific surface area of which was 1050m 2 g -1 The average pore diameter was 3 nm.
Example 4:
the procedure was the same as in example 1, except that 15 g of zinc chloride was added to obtain a porous carbon with zinc monoatomically doped in the pore-limited region, having a specific surface area of 942m 2 g -1 The average pore diameter was 2.0 nm.
Example 5:
the procedure was the same as in example 1, except that the carbonization temperature was 700℃to give a porous carbon doped with zinc monoatoms in the pore confinement region, and the specific surface area was 1028m 2 g -1 The average pore diameter was 3.0 nm.
Example 6:
the procedure was the same as in example 1, except that the carbonization temperature was 900℃to obtain a porous carbon doped with zinc monoatoms in the pore confinement region, the specific surface area of which was 1185m 2 g -1 The average pore size was 3.8 nm.
Example 7:
the procedure was the same as in example 1, except that the carbonization temperature was 1000℃to obtain a porous carbon doped with zinc monoatoms in the pore confinement region, and the specific surface area was 1346m 2 g -1 The average pore size was 4.8 nm.
Example 8:
the procedure was as in example 1, except that the inert gas was argon, to give a porous carbon doped with zinc monoatoms in the pore confinement region, having a specific surface area of 1152m 2 g -1 The average pore size was 3.7 nm.
Example 9:
the porous carbon material doped with the single atoms of the zinc in the pore restriction domain prepared in the example 1, acetylene black and a binder are mixed according to the mass ratio of 8:1:1 into slurry. The slurry was then coated on aluminum foil and dried in a vacuum oven at 120 ℃ for 12 hours. Finally, the electrode plate is cut into a circular plate with the diameter of 1.2 cm.
Porous carbon material doped with pore-limited zinc monoatoms is used as anode material of lithium ion capacitor at 100mAg -1 The electrochemical properties were tested at the current density of (c). As shown in figure 4, the specific capacity of the material can reach 130mAh g under the current density -1 . Even at high current density of 10Ag -1 Can still keep 95mAh g -1 Exhibits excellent electrochemical properties.
While the preferred embodiment of the present application has been described in detail, the present application is not limited to the embodiment, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present application, and these equivalent modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.
Claims (3)
1. A porous carbon material doped with zinc monoatoms in a pore confinement region is characterized in that the porous carbon material has a diameter of 800-1300m 2 g -1 And pore size of 2-5nm, and zinc monoatoms are uniformly doped in the pore channels.
2. The porous carbon material doped with pore-limited zinc monoatoms according to claim 1, the preparation method comprising the following steps:
step one: and (3) dissolving polyacrylonitrile in zinc chloride aqueous solutions with different contents, and carrying out a reaction by heating and stirring to obtain a sol-like precursor.
Step two: the sol precursor obtained is put into a tube furnace, gradually heated to 280 ℃ in an air environment, and pre-oxidized for 3 hours. Then heating to 700-1000 ℃ gradually under inert atmosphere, and preserving heat for 1-5 hours. Finally, hydrochloric acid is used for washing away impurities to obtain the zinc monoatomic doped porous carbon material. Wherein the inert atmosphere selected comprises nitrogen and argon.
3. A porous carbon material doped with pore-limited zinc monoatoms prepared according to the method of claim 2, its use as a positive electrode material for lithium ion capacitors, comprising the steps of:
step one: porous carbon material doped with zinc monoatoms in a pore confinement region, acetylene black and a binder according to the mass ratio of 8:1:1 into slurry.
Step two: the slurry was coated on aluminum foil and dried in a vacuum oven at 120 ℃ for 12 hours.
Step three: and cutting the aluminum foil coated with the dried slurry into electrode plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310967906.XA CN116947018A (en) | 2023-08-02 | 2023-08-02 | Porous carbon material doped with zinc monoatoms in pore confinement, preparation method of porous carbon material and application of porous carbon material as anode material of lithium ion capacitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310967906.XA CN116947018A (en) | 2023-08-02 | 2023-08-02 | Porous carbon material doped with zinc monoatoms in pore confinement, preparation method of porous carbon material and application of porous carbon material as anode material of lithium ion capacitor |
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| CN116947018A true CN116947018A (en) | 2023-10-27 |
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- 2023-08-02 CN CN202310967906.XA patent/CN116947018A/en active Pending
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