CN113140410B - Nitrogen-doped carbon nanosheet/MXene composite nanomaterial, and preparation method and application thereof - Google Patents
Nitrogen-doped carbon nanosheet/MXene composite nanomaterial, and preparation method and application thereof Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 81
- 239000002135 nanosheet Substances 0.000 title claims abstract description 66
- 239000002131 composite material Substances 0.000 title claims abstract description 64
- 239000002086 nanomaterial Substances 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 30
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 19
- 238000012360 testing method Methods 0.000 claims description 17
- 238000005245 sintering Methods 0.000 claims description 16
- 229910052723 transition metal Inorganic materials 0.000 claims description 15
- -1 transition metal salt Chemical class 0.000 claims description 12
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- 238000002156 mixing Methods 0.000 claims description 8
- 239000012298 atmosphere Substances 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 4
- 229930006000 Sucrose Natural products 0.000 claims description 4
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 229940078487 nickel acetate tetrahydrate Drugs 0.000 claims description 4
- OINIXPNQKAZCRL-UHFFFAOYSA-L nickel(2+);diacetate;tetrahydrate Chemical group O.O.O.O.[Ni+2].CC([O-])=O.CC([O-])=O OINIXPNQKAZCRL-UHFFFAOYSA-L 0.000 claims description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 3
- 239000002041 carbon nanotube Substances 0.000 claims description 3
- 229910021389 graphene Inorganic materials 0.000 claims description 3
- 239000005720 sucrose Substances 0.000 claims description 3
- 150000003624 transition metals Chemical group 0.000 claims description 3
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 2
- 239000012300 argon atmosphere Substances 0.000 claims description 2
- ZBYYWKJVSFHYJL-UHFFFAOYSA-L cobalt(2+);diacetate;tetrahydrate Chemical compound O.O.O.O.[Co+2].CC([O-])=O.CC([O-])=O ZBYYWKJVSFHYJL-UHFFFAOYSA-L 0.000 claims description 2
- 125000000524 functional group Chemical group 0.000 claims description 2
- 239000008103 glucose Substances 0.000 claims description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000003801 milling Methods 0.000 claims 1
- 239000003990 capacitor Substances 0.000 abstract description 14
- 238000009825 accumulation Methods 0.000 abstract description 8
- 230000007547 defect Effects 0.000 abstract description 7
- 241000446313 Lamella Species 0.000 abstract description 5
- 238000006479 redox reaction Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000001291 vacuum drying Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000840 electrochemical analysis Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229960004793 sucrose Drugs 0.000 description 3
- 229910021607 Silver chloride Inorganic materials 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000007833 carbon precursor Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002064 nanoplatelet Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention relates to a nitrogen-doped carbon nanosheet/MXene composite nanomaterial, and a preparation method and application thereof. In the composite nano material, the carbon nano sheet and MXene form an interpenetrating lamellar structure, and nitrogen is doped in the carbon nano sheet and the MXene. The method aims at the problem that the electrochemical performance cannot be fully utilized due to the stacking and accumulation of MXene nanosheets in the prior art. The composite material can effectively overcome the defects of self stacking and accumulation of MXene, and greatly improves the cycle stability of the battery; besides, the redox reaction and pseudo-capacitance active sites with obvious MXene lamella spacing are increased, and the specific capacity of the super capacitor is improved.
Description
Technical Field
The invention belongs to the technical field of electrochemical energy, and particularly relates to a nitrogen-doped carbon nanosheet/MXene composite nanomaterial, and a preparation method and application thereof.
Background
Based on the rapid development of portable electronic and microelectronic devices, various energy storage technologies have emerged. Among these, flexible electrochemical capacitors (also called supercapacitors) have great potential for commercialization due to high power density, fast charge and discharge and long cycle life. The supercapacitor stores electrochemical energy by absorbing ions in an electrolyte through the surface of an electrode material having a high specific surface area, and thus, it can store and transport a large amount of charges in a short time, compared to a battery. One of the major challenges in making supercapacitor electrode sheets is excellent mechanical flexibility, and the other challenge is to increase the energy density of the overall capacitor.
MXene is a novel two-dimensional material and gradually becomes a new choice of a supercapacitor capacitance material. Compared with other two-dimensional materials, MXene is rich in oxygen surface groups and has extremely high volume specific capacity, so that the energy density is effectively improved. However, MXene has the same disadvantages as other two-dimensional nanomaterials, so that stacking and accumulation of MXene nanosheets are caused, so that electrochemical performance cannot be fully utilized.
CN106328890B discloses a carbon pillared MXene composite material and application thereof, wherein the carbon pillared MXene composite material comprises a two-dimensional layered MXene carrier and carbon nanosheets loaded between MXene layers; the preparation method comprises the following steps: (1) Taking MAX raw materials, and treating in HF solution to obtain MXene materials; (2) Soaking the MXene material obtained in the step (1) in a solution with the cationic carbon precursor content of 0.005-20 g/mL, stirring for 0.5-72 h at 30-100 ℃, and then centrifuging, washing and drying to obtain a pre-pillared MXene material; (3) Heating the pre-pillared MXene material to 300-800 ℃ at the speed of 2-10 ℃/min under the protective atmosphere, and carrying out heat preservation and calcination treatment for 0.5-4 h to obtain the carbon pillared MXene material. However, the MXene material obtained by the method is easy to stack by itself and has poor electrochemical performance.
Therefore, there is a need in the art to develop a novel MXene composite material, which can overcome the defects of MXene self-stacking and accumulation, and the prepared battery has better cycle stability
Disclosure of Invention
The method aims at the problem that the electrochemical performance cannot be fully utilized due to the stacking and accumulation of MXene nanosheets in the prior art. The invention aims to provide a nitrogen-doped carbon nanosheet/MXene composite nanomaterial, and a preparation method and application thereof. The nano-sheet/MXene composite nano-material can effectively overcome the defects of self stacking and accumulation of MXene, and greatly improve the cycle stability of the battery; the prepared super capacitor has higher specific capacity.
In order to achieve the purpose, the invention adopts the following technical scheme:
one objective of the present invention is to provide a nitrogen-doped carbon nanosheet/MXene composite nanomaterial, in which the carbon nanosheet and MXene form an interpenetrating lamellar structure, and nitrogen is doped in the carbon nanosheet and MXene.
The carbon nanosheet and the MXene in the composite material form an interpenetrating laminated structure, and due to the synergistic effect of the laminated structure, the defects of self stacking and accumulation of the MXene are effectively overcome, and the cycle stability of the battery is greatly improved; according to the invention, through nitrogen doping, the oxidation-reduction reaction and pseudo-capacitance active sites with obvious MXene lamella spacing are increased; the carbon nano sheet can improve the specific surface area of the composite electrode, promote the capacitance characteristic of the electrode surface of 36107and improve the specific capacity of the supercapacitor.
Preferably, the number of the nitrogen-doped carbon nano sheet/MXene composite nano material sheets is 10-30, such as 12 sheets, 15 sheets, 18 sheets, 20 sheets, 22 sheets, 25 sheets or 28 sheets.
Preferably, in the nitrogen-doped carbon nanosheet/MXene composite nanomaterial, the content of nitrogen element is 5 to 30At%, such as 10At%, 12At%, 15At%, 18At%, 20At%, 25At%, 28At%, and the like.
The invention selects proper nitrogen doping proportion to increase the obvious oxidation-reduction reaction and pseudo-capacitance active sites of MXene lamella spacing.
Preferably, in the nitrogen-doped carbon nano sheet/MXene composite nano material, the content of the carbon nano sheet is 20-40 wt%, such as 22wt%, 25wt%, 28wt%, 30wt%, 32wt%, 35wt% or 38 wt%.
Preferably, the content of MXene in the nitrogen-doped carbon nanosheet/MXene composite nanomaterial is 15-50 wt%, such as 20wt%, 25wt%, 30wt%, 35wt%, 40wt%, 45wt%, or the like.
The second purpose of the present invention is to provide a method for preparing the nitrogen-doped carbon nanosheet/MXene composite nanomaterial, wherein the nitrogen-doping reaction of the carbon nanosheet and MXene and the growth of the carbon nanosheet on the MXene surface are simultaneously performed.
The preparation method of the nitrogen-doped carbon nanosheet/MXene composite nanomaterial has concise steps, and the carbon nanosheet and the MXene are synchronously nitrogen-doped and generated at the same time, so that the experimental steps can be greatly simplified, and the industrial practice is facilitated.
Preferably, the preparation method comprises: mixing MXene, transition metal salt, nitrogen source and carbon source in water, and sintering to obtain the nitrogen-doped carbon nanosheet/MXene composite nanomaterial.
Preferably, the nitrogen source comprises a dihydrodiamine and/or a melamine.
Preferably, the carbon source comprises sucrose and/or glucose.
Preferably, the transition metal salt is a transition metal acetate salt, preferably nickel acetate tetrahydrate or cobalt acetate tetrahydrate.
The transition metal acetate of the present invention functions as a catalyst in the reaction.
Preferably, the MXene has the chemical formula of M n+1 X n T x Or M n+1 X n Wherein M represents a transition metal; x represents carbon or nitrogen; t is x Represents a surface functional group comprising any one or a combination of at least two of-O, -OH and-F; n is an integer of 1 to 3.
Preferably, the mass ratio of the MXene to the carbon source is (3-4) to (1-2), for example, 3.1.
The mass ratio of MXene to a carbon source is (3-4) to (1-2), and the mass ratio is too large, namely, the MXene content is too high, the carbon source is too low, and carbon nano sheets cannot uniformly grow on the MXene surface; if the mass ratio is too small, the MXene content is too low, the carbon source is too much, the carbon nanosheets cover the MXene, and the MXene performance cannot be fully exerted.
Preferably, the mass ratio of MXene to transition metal acetate is (3-4): (1-2), for example, 3.1.
The mass ratio of MXene to transition metal acetate is (3-4) to (1-2), and the mass ratio is too large, namely the content of the transition metal acetate is too low, so that the growth of carbon nanosheets cannot be fully catalyzed; the mass ratio is too low, namely the content of the transition metal acetate is too high, so that the environmental pollution is large.
Preferably, the mass ratio of the MXene to the nitrogen source is (3-4) such as 3.1.
The mass ratio of MXene to a nitrogen source is (3-4) to (15-25), and the MXene stacking defect cannot be improved because the MXene stacking defect is slightly influenced by an overlarge mass ratio, namely an overlong nitrogen source and an overlong MXene layer interval; the mass ratio is too small, namely the content of the nitrogen source is too much, the MXene lamella is too dispersed to form more macropores, and the mesopores and the micropores are less, so that the ion transmission is not facilitated.
Preferably, the sintering process comprises: preheated and then heated to the sintering temperature.
Preferably, the temperature for preheating is 500 to 600 ℃, such as 510 ℃, 520 ℃, 530 ℃, 540 ℃, 550 ℃, 560 ℃, 570 ℃, 580 ℃, 590 ℃ or the like.
Preferably, the preheating holding time is 1 to 3 hours, such as 1.1 hour, 1.3 hours, 1.5 hours, 1.8 hours, 2 hours, 2.1 hours, 2.3 hours, 2.5 hours, 2.6 hours, 2.7 hours, 2.8 hours or 2.9 hours, etc.
Preferably, the sintering temperature is 600 to 800 ℃, such as 610 ℃, 630 ℃, 650 ℃, 670 ℃, 690 ℃, 700 ℃, 710 ℃, 720 ℃, 740 ℃, 750 ℃, 760 ℃, 780 ℃, 790 ℃ and the like.
Preferably, the holding time at the sintering temperature is 1 to 3 hours, such as 1.1 hour, 1.3 hour, 1.5 hour, 1.8 hour, 2 hour, 2.1 hour, 2.3 hour, 2.5 hour, 2.6 hour, 2.7 hour, 2.8 hour, 2.9 hour and the like.
Preferably, the atmosphere of the sintering is a protective atmosphere, preferably an argon atmosphere.
Preferably, before sintering, a drying process is also included.
Preferably, after the sintering, a grinding process is also included.
The invention also aims to provide a preparation method of the electrode plate, which comprises the following steps:
(1) Mixing the nitrogen-doped carbon nano sheet/MXene composite nano material, a conductive agent, a binder and a solvent to obtain nitrogen-doped carbon nano sheet/MXene composite nano material slurry;
(2) And coating the nitrogen-doped carbon nanosheet/MXene composite nanomaterial slurry on a current collector to obtain the electrode plate.
Preferably, the conductive agent in step (1) includes any one or a combination of at least two of conductive graphite, carbon nanotubes and graphene.
Preferably, the binder in the step (1) is polyvinylidene fluoride.
Preferably, the solvent in step (1) is N-methylpyrrolidone.
Preferably, the mass ratio of the nitrogen-doped carbon nanoplatelet/MXene composite nanomaterial, the conductive agent and the binder is (80-98): 5-92, such as (2-4).
Preferably, the current collector in the step (2) is carbon paper.
Preferably, after the step (2), a drying process is also included.
A fourth object of the present invention is to provide an electrode sheet obtained by the method according to the third object.
The fifth purpose of the invention is to provide a three-electrode test system of a super capacitor, which comprises the electrode plate of the fourth purpose.
Preferably, in the three-electrode test system of the supercapacitor, the working electrode is the electrode plate of the fourth purpose.
Compared with the prior art, the invention has the following beneficial effects:
(1) The carbon nanosheet and MXene in the composite material form an interpenetrating lamellar structure, and due to the synergistic effect of the lamellar structure, the defects of self stacking and accumulation of the MXene are effectively overcome, so that the cycle stability of the battery is greatly improved;
(2) According to the invention, by adjusting a proper nitrogen doping proportion, the oxidation-reduction reaction and pseudo-capacitance active sites with obvious MXene lamella spacing are increased;
(3) The carbon nano sheet can improve the specific surface area of the composite electrode, can promote the capacitance characteristic of the electrode surface of 36107and improve the specific capacity of the supercapacitor;
(4) The preparation method of the nitrogen-doped carbon nanosheet/MXene composite nanomaterial has concise steps, and the carbon nanosheet and the MXene are synchronously nitrogen-doped and generated at the same time, so that the experimental steps can be greatly simplified, and the industrial practice is facilitated.
Drawings
FIG. 1 is a flow chart of the preparation of the nitrogen-doped carbon nanosheet/MXene composite nanomaterial in example 1 of the present invention;
fig. 2 is a flow chart of composite electrode sheet preparation and three-electrode system assembly in example 1 of the present invention;
FIG. 3 is a CV diagram illustrating an electrochemical test chart of the N-doped carbon nanosheet/MXene composite nanomaterial of example 1 of the present invention;
FIG. 4 is a GCD diagram, which is an electrochemical test diagram of the N-doped carbon nanosheet/MXene composite nanomaterial in example 1 of the present invention;
fig. 5 is an electrochemical test chart-EIS chart of the nitrogen-doped carbon nanosheet/MXene composite nanomaterial in example 1 of the present invention.
Detailed Description
For the purpose of facilitating an understanding of the present invention, the present invention will now be described by way of examples. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitation of the present invention.
Example 1
S1, a preparation flow chart of the nitrogen-doped carbon nanosheet/MXene composite nanomaterial is shown in FIG 1, and the specific preparation method comprises the following steps:
(1) According to the weight fraction, 4 parts of Ti 3 C 2 Uniformly mixing the powder with 1 part of nickel acetate tetrahydrate, 20 parts of dihydrodiamine and 2 parts of sucrose, adding a little (10 mL) of deionized water to completely dissolve the mixture, fully stirring, and carrying out vacuum drying at 60 ℃ for 48 hours to obtain a powdery mixture containing MXene;
(2) Preheating the mixture to 600 ℃ under the protection of argon gas flow, preserving heat for 2h, heating to 800 ℃, preserving heat for 2h, cooling to room temperature, taking out, and carefully grinding to obtain the nitrogen-doped carbon nanosheet/MXene composite nanomaterial;
s2, the composite electrode plate and a preparation flow chart of the three-electrode system assembly prepared by adopting the composite electrode plate are shown in figure 2, and the specific preparation method of the composite electrode plate comprises the following steps:
(3) Uniformly mixing the nitrogen-doped carbon nanosheet/MXene composite nanomaterial, a conductive agent and polyvinylidene fluoride according to the weight ratio of 8;
(4) Uniformly coating the nitrogen-doped carbon nanosheet/MXene composite nanomaterial slurry on the surface of sheared carbon paper of a current collector of a super capacitor, and carrying out vacuum drying at 60 ℃ for 12h to completely remove N-methylpyrrolidone to obtain a composite electrode slice;
s3, the specific preparation method for assembling the three-electrode system comprises the following steps:
(5) The nitrogen-doped carbon nanosheet/MXene composite nanomaterial for the three-electrode test system is used as a working electrode, the high-purity graphite is used as a counter electrode, and the Ag/AgCl is used as a reference electrode; the test system adopts 3mol/L H 2 SO 4 As an electrolyte;
(6) The electrochemical performance of a single electrode plate is tested by a three-electrode system;
(7) The electrochemical performance of the three-electrode system was tested using an electrochemical workstation: the specific capacitance is about 321F/g at the sweep speed of 5mV/s, after the sweep speed is expanded to 100 times (500 mV/s), the specific capacitance is about 137F/g, the electrochemical cycle charging and discharging performance is stable, the internal resistance is small, the CV curve is shown in figure 3, the GCD curve is shown in figure 4, and the EIS curve is shown in figure 5.
Example 2
S1, a preparation method of the nitrogen-doped carbon nanosheet/MXene composite nanomaterial comprises the following steps:
(1) According to the weight fraction, 3 parts of Ti 3 C 2 Uniformly mixing the powder with 1 part of nickel acetate tetrahydrate, 20 parts of dihydrodiamine and 1 part of cane sugar, adding a little (10 mL) of deionized water to completely dissolve the mixture, fully stirring, and carrying out vacuum drying at 60 ℃ for 48 hours to obtain a powdery mixture containing MXene;
preheating the mixture to 600 ℃ under the protection of argon gas flow, preserving heat for 3h, then heating to 700 ℃, preserving heat for 2h, cooling to room temperature, taking out, and carefully grinding to obtain the nitrogen-doped carbon nanosheet/MXene composite nanomaterial;
s2, the preparation method of the composite electrode plate comprises the following steps:
(3) Uniformly mixing the nitrogen-doped carbon nanosheet/MXene composite nanomaterial, a conductive agent and polyvinylidene fluoride according to the weight ratio of 8;
(4) Uniformly coating the nitrogen-doped carbon nanosheet/MXene composite nanomaterial slurry on the surface of sheared carbon paper of a current collector of a super capacitor, and carrying out vacuum drying at 60 ℃ for 12h to completely remove N-methylpyrrolidone to obtain a composite electrode slice;
s3, the preparation method of the three-electrode system assembly comprises the following steps:
(5) The nitrogen-doped carbon nano sheet/MXene composite nano material is used for a working electrode, the high-purity graphite is used for a counter electrode, and the Ag/AgCl is used for a reference electrode in a three-electrode test system; the test system adopts 3mol/L H 2 SO 4 As an electrolyte;
(6) The electrochemical performance of a single electrode plate is tested by a three-electrode system;
(7) Testing the electrochemical performance of the super capacitor by using a battery testing instrument: the specific capacitance is about 238F/g under the sweep speed of 2mV/s, and after the sweep speed is expanded to 100 times (500 mV/s), the specific capacitance is about 106F/g, the electrochemical cycle charge-discharge performance is stable, and the internal resistance is small.
Example 3
The difference from the embodiment 1 is that the weight fraction of the dihydrodiamine in the step (1) is 40 parts;
preparing a composite electrode plate and a super capacitor in the same manner as in example 1, and testing the electrochemical performance of the super capacitor by using a battery testing instrument: the specific capacitance is about 334F/g under 5mV/s, and after the sweep speed is enlarged to 100 times (500 mV/s), the specific capacitance is about 124F/g, the electrochemical cycle charging and discharging performance is stable, and the internal resistance is small.
Example 4
The difference from the example 1 is that the weight fraction of the dihydrodiamine in the step (1) is 10 parts;
preparing a composite electrode plate and a super capacitor in the same manner as in example 1, and testing the electrochemical performance of the super capacitor by using a battery testing instrument: the specific capacitance at a sweep rate of 5mV/s was about 282F/g, and after the sweep rate was increased to 100 times (500 mV/s), the specific capacitance was about 118F/g.
Comparative example 1
The difference from example 1 is that step (1) does not add the dihydrodiamine;
preparing a composite electrode plate and a super capacitor in the same manner as in example 1, and testing the electrochemical performance of the super capacitor by using a battery testing instrument: the specific capacitance at a sweep rate of 5mV/s was about 243F/g, and after the sweep rate was increased to 100 times (500 mV/s), the specific capacitance was about 102F/g.
The applicant states that the present invention is illustrated by the above examples to show the detailed process equipment and process flow of the present invention, but the present invention is not limited to the above detailed process equipment and process flow, i.e. it does not mean that the present invention must rely on the above detailed process equipment and process flow to be implemented. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (27)
1. A preparation method of a nitrogen-doped carbon nanosheet/MXene composite nanomaterial is characterized in that in the composite nanomaterial, a carbon nanosheet and MXene form an interpenetrating laminated structure, and nitrogen elements are doped in the carbon nanosheet and the MXene; in the nitrogen-doped carbon nanosheet/MXene composite nanomaterial, the content of nitrogen element is 5-30 At%;
the preparation method of the nitrogen-doped carbon nanosheet/MXene composite nanomaterial comprises the following steps: mixing MXene, transition metal salt, a nitrogen source and a carbon source in water, and sintering to obtain a nitrogen-doped carbon nanosheet/MXene composite nanomaterial;
the nitrogen source is dihydrodiamine; the mass ratio of MXene to the nitrogen source is (3-4) to (15-25);
the carbon source comprises sucrose and/or glucose;
the transition metal salt is a transition metal acetate.
2. The preparation method of claim 1, wherein the number of the sheet layers of the nitrogen-doped carbon nanosheet/MXene composite nanomaterial is from 10 to 30 sheets.
3. The preparation method of claim 1, wherein the nitrogen-doped carbon nanosheet/MXene composite nanomaterial comprises carbon nanosheet in an amount of 20 to 40wt%.
4. The preparation method of claim 1, wherein the content of MXene in the nitrogen-doped carbon nanosheet/MXene composite nanomaterial is 15-50 wt%.
5. The method according to claim 1, wherein the transition metal acetate is nickel acetate tetrahydrate or cobalt acetate tetrahydrate.
6. The method of claim 1, wherein the MXene has the formula M n+1 X n T x Or M n+1 X n Wherein M represents a transition metal; x represents carbon or nitrogen; t is x Represents a surface functional group including any one of-O, -OH and-F or a combination of at least two of them; n is an integer of 1 to 3.
7. The method according to claim 1, wherein the mass ratio of MXene to the carbon source is (3-4) to (1-2).
8. The method according to claim 1, wherein the mass ratio of MXene to the transition metal acetate is (3-4) to (1-2).
9. The method of claim 1, wherein the sintering comprises: preheated and then heated to the sintering temperature.
10. The method of claim 9, wherein the pre-heating temperature is 500 to 600 ℃.
11. The method of claim 9, wherein the pre-heating is performed for a holding time of 1 to 3 hours.
12. The method of claim 9, wherein the sintering temperature is 600 to 800 ℃.
13. The method of claim 9, wherein the holding time at the sintering temperature is 1 to 3 hours.
14. The method of claim 1, wherein the sintering atmosphere is a protective atmosphere.
15. The method of claim 14, wherein the protective atmosphere is an argon atmosphere.
16. The method of claim 1, further comprising a drying process prior to sintering.
17. The method of claim 1, wherein after sintering, further comprising a milling process.
18. The preparation method of the electrode plate is characterized by comprising the following steps:
(1) Mixing the nitrogen-doped carbon nanosheet/MXene composite nanomaterial obtained by the preparation method of any one of claims 1-17, a conductive agent, a binder and a solvent to obtain nitrogen-doped carbon nanosheet/MXene composite nanomaterial slurry;
(2) And coating the nitrogen-doped carbon nanosheet/MXene composite nanomaterial slurry on a current collector to obtain the electrode plate.
19. The method for preparing an electrode sheet according to claim 18, wherein the conductive agent in step (1) comprises any one of conductive graphite, carbon nanotubes and graphene or a combination of at least two of the conductive graphite, the carbon nanotubes and the graphene.
20. The method for preparing an electrode sheet according to claim 18, wherein the binder in the step (1) is polyvinylidene fluoride.
21. The process for producing an electrode sheet according to claim 18, wherein the solvent in the step (1) is N-methylpyrrolidone.
22. The preparation method of the electrode sheet as defined in claim 18, wherein the mass ratio of the nitrogen-doped carbon nanosheet/MXene composite nanomaterial of step (1) to the conductive agent to the binder is (80-98): (1-10): 1-10).
23. The electrode sheet preparation method according to claim 18, wherein the current collector in step (2) is carbon paper.
24. The method for preparing an electrode sheet according to claim 18, wherein after the step (2), a drying process is further included.
25. An electrode sheet, characterized in that it is obtained by the method for producing an electrode sheet according to any one of claims 18 to 24.
26. A three-electrode test system of a supercapacitor, comprising the electrode sheet of claim 25.
27. The three-electrode test system of the supercapacitor according to claim 26, wherein in the three-electrode test system of the supercapacitor, the working electrode is the electrode sheet according to claim 25.
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