CN115417978A - Preparation of poly (2, 4, 6-tri (thiophen-2-yl) -1,3, 5-triazine) with porous structure and application thereof - Google Patents
Preparation of poly (2, 4, 6-tri (thiophen-2-yl) -1,3, 5-triazine) with porous structure and application thereof Download PDFInfo
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- NJIOTNJBYBDXMZ-UHFFFAOYSA-N 2,4,6-trithiophen-2-yl-1,3,5-triazine Chemical compound C1=CSC(C=2N=C(N=C(N=2)C=2SC=CC=2)C=2SC=CC=2)=C1 NJIOTNJBYBDXMZ-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 229910001415 sodium ion Inorganic materials 0.000 claims description 15
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 12
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 239000000178 monomer Substances 0.000 claims description 8
- 239000000047 product Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 239000007773 negative electrode material Substances 0.000 claims description 5
- LYGJENNIWJXYER-UHFFFAOYSA-N nitromethane Chemical compound C[N+]([O-])=O LYGJENNIWJXYER-UHFFFAOYSA-N 0.000 claims description 5
- CUPOOAWTRIURFT-UHFFFAOYSA-N thiophene-2-carbonitrile Chemical compound N#CC1=CC=CS1 CUPOOAWTRIURFT-UHFFFAOYSA-N 0.000 claims description 5
- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000000944 Soxhlet extraction Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- 239000012265 solid product Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 229920000642 polymer Polymers 0.000 abstract description 12
- 239000011734 sodium Substances 0.000 abstract description 5
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 abstract description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 abstract description 3
- 229910052708 sodium Inorganic materials 0.000 abstract description 3
- 230000002860 competitive effect Effects 0.000 abstract description 2
- 230000001590 oxidative effect Effects 0.000 abstract description 2
- 238000006116 polymerization reaction Methods 0.000 abstract description 2
- 230000002441 reversible effect Effects 0.000 abstract 1
- 150000002500 ions Chemical class 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 239000002904 solvent Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 3
- 230000001351 cycling effect Effects 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- -1 poly (2, 4, 6-tris (thien-2-yl) -1,3, 5-triazine) sodium Chemical compound 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical group C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 230000022131 cell cycle Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- WGLUMOCWFMKWIL-UHFFFAOYSA-N dichloromethane;methanol Chemical compound OC.ClCCl WGLUMOCWFMKWIL-UHFFFAOYSA-N 0.000 description 1
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 239000003273 ketjen black Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- C08G61/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G61/12—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule
- C08G61/122—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule derived from five- or six-membered heterocyclic compounds, other than imides
- C08G61/123—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule derived from five- or six-membered heterocyclic compounds, other than imides derived from five-membered heterocyclic compounds
- C08G61/126—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule derived from five- or six-membered heterocyclic compounds, other than imides derived from five-membered heterocyclic compounds with a five-membered ring containing one sulfur atom in the ring
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
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Abstract
The invention discloses a preparation method and application of poly (2, 4, 6-tri (thiophene-2-yl) -1,3, 5-triazine) with a porous structure, wherein FeCl is adopted 3 The catalyzed oxidative polymerization results in a polymer with a conjugated triazine framework, as well as open and connected tube bundle structures. The preparation process is simple, and the obtained product has competitive sodium storage performance in the aspects of reversible capacity, long service life and rate performance.
Description
Technical Field
The invention relates to a preparation method of poly (2, 4, 6-tri (thiophene-2-yl) -1,3, 5-triazine) with a porous structure and application thereof as a negative electrode material of a sodium-ion battery, belonging to the field of polymer materials.
Background
With the growing demand for energy storage and the shortage of resource supply, the cost of lithium ion batteries (SIBs) is increasing, limiting their large-scale application to electric vehicles and stationary energy storage devices. Sodium Ion Batteries (SIBs) are an attractive alternative energy source, and are an attractive and competitive energy storage system due to the high natural abundance and low cost of sodium.
The advantages of the organic battery material such as environmental friendliness and the customizability of functional groups further prove the attractive application potential. However, the dense structure of the organic polymer material inevitably reduces the ionic conductivity, resulting in poor electrochemical performance. Therefore, through targeted molecular engineering and/or structural design, it is of great urgent and important significance to design polymers with high ionic and electronic conductivity, abundant electroactive sites and multiple electroactive centers.
Disclosure of Invention
The invention aims to provide a preparation method of poly (2, 4, 6-tri (thiophene-2-yl) -1,3, 5-triazine) with a simple preparation method, a novel structure and a porous structure and application of the poly (2, 4, 6-tri (thiophene-2-yl) -1,3, 5-triazine) as a negative electrode material of a sodium ion battery so as to improve the stability and the dynamic performance of the sodium ion battery.
In order to solve the technical problem, the invention adopts the following technical scheme:
the invention relates to a preparation method of poly (2, 4, 6-tri (thiophene-2-yl) -1,3, 5-triazine) with a porous structure, which comprises the following steps:
step 1: dissolving 2-cyanothiophene in chloroform, cooling in ice bath, adding trifluoromethanesulfonic acid, and stirring for uniform dispersion; adjusting the pH value of the system by ammonia water at 5 ℃, filtering, washing and drying to obtain a monomer 2,4, 6-tri (thiophene-2-yl) -1,3, 5-triazine (TTA);
and 2, step: dissolving the product obtained in step 1 in 1, 2-dichloroethane at 50-60 deg.C, and adding the solution to FeCl 3 The mixture of nitromethane and 1, 2-dichloroethane is then placed in an autoclave reactor for sealing and reacts for 10 to 15 hours at the temperature of 140 ℃; after the reaction is finished, filtering and washing the solid product by using ethanol and water, and adding the obtained product into HCl solution to removeAnd performing soxhlet extraction and purification on impurities by methanol and dichloromethane, and performing vacuum drying to obtain the poly (2, 4, 6-tri (thiophene-2-yl) -1,3, 5-triazine).
In the step 1, the adding proportion of the 2-cyanothiophene, the chloroform and the trifluoromethanesulfonic acid is 1.5-2.5 g: 25-30 mL:5 to 6g.
In the step 1, ammonia water with the temperature of 5 ℃ is used for adjusting the pH value of the system to 7-10.
In step 2, 0.4 to 0.6g of the product obtained in step 1 is dissolved in 8 to 12mL of 1, 2-dichloroethane at 50 to 60 ℃ and the resulting solution is subsequently added to 0.8 to 2.5g of FeCl 3 0.5 to 1.0mL of nitromethane and 5 to 10mL of 1, 2-dichloroethane.
In the step 2, the concentration of the HCl solution is 1.8-2.3 mol/L, and the using amount is 18-22 mL.
In the step 2, the temperature of vacuum drying is 175-190 ℃ and the time is 12-24 h.
The poly (2, 4, 6-tri (thiophene-2-yl) -1,3, 5-triazine) material with a porous structure, which is prepared by the invention, has a conjugated triazine framework and an open and connected tube bundle structure.
The poly (2, 4, 6-tri (thiophene-2-yl) -1,3, 5-triazine) material with a porous structure prepared by the invention is used as a negative electrode material of a sodium ion battery to improve the stability and the dynamic performance of the sodium ion battery.
The poly (2, 4, 6-tri (thiophene-2-yl) -1,3, 5-triazine) tube bundle has a three-model (i.e. macro-meso-micro) pore structure, and the tube bundle polymer with a layered porous structure can expose abundant electroactive sites, shorten the ion diffusion distance and improve the ion conductivity. Therefore, the poly (2, 4, 6-tri (thiophene-2-yl) -1,3, 5-triazine) tube bundle polymer synthesized by the invention successfully shows the advantages of the polymer, overcomes the defects of limited utilization rate of the electroactive sites and low ionic conductivity, and has ultrahigh rate performance and obvious cycle life. In addition, poly (2, 4, 6-tris (thien-2-yl) -1,3, 5-triazine) has up to 983mAh g -1 The theoretical capacity of (c).
The invention has the beneficial effects that:
the invention relates to a high-performance sodium ion battery cathode material,by passing through FeCl 3 The catalyst is prepared by a catalytic oxidative polymerization method, and the method is simple and convenient. The resulting product has a conjugated triazine framework, as well as an open and connected bundle structure. The polymer has a three-model (i.e. macro-meso-micro) pore structure, and the tube bundle polymer with a layered porous structure can expose abundant electroactive sites, shorten the ion diffusion distance and improve the ion conductivity. Therefore, the polymer overcomes the defects of limited utilization rate of electroactive sites and low ionic conductivity, and shows ultrahigh rate performance and remarkable cycle life.
Drawings
FIG. 1 is a scheme showing the synthesis of poly (2, 4, 6-tris (thien-2-yl) -1,3, 5-triazine) obtained in examples 1 and 2 of the present invention;
FIG. 2 is an SEM photograph of poly (2, 4, 6-tris (thien-2-yl) -1,3, 5-triazine) obtained in examples 1 and 2 of the present invention;
FIG. 3 is an infrared curve of poly (2, 4, 6-tris (thien-2-yl) -1,3, 5-triazine) and 2,4, 6-tris (thien-2-yl) -1,3, 5-triazine) obtained in examples 1 and 2 of the present invention;
FIG. 4 is a graph comparing the battery rate performance of poly (2, 4, 6-tris (thien-2-yl) -1,3, 5-triazine) and 2,4, 6-tris (thien-2-yl) -1,3, 5-triazine) obtained in examples 1,2 of the present invention;
FIG. 5 is a graph comparing the cell cycle performance of poly (2, 4, 6-tris (thien-2-yl) -1,3, 5-triazine) and 2,4, 6-tris (thien-2-yl) -1,3, 5-triazine) obtained in examples 1,2 of the present invention;
FIG. 6 is a graph showing the distribution of pore diameters of poly (2, 4, 6-tris (thien-2-yl) -1,3, 5-triazine) obtained in example 2 of the present invention;
FIG. 7 is a graph comparing the thermogravimetric curves of poly (2, 4, 6-tris (thien-2-yl) -1,3, 5-triazine) and 2,4, 6-tris (thien-2-yl) -1,3, 5-triazine) obtained in example 2 of the present invention;
FIG. 8 shows the ratio of poly (2, 4, 6-tris (thien-2-yl) -1,3, 5-triazine) and 2,4, 6-tris (thien-2-yl) -1,3, 5-triazine obtained in example 2 of the present invention at 2A g –1 Plot of cycling performance versus current density.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. The following is merely exemplary and illustrative of the inventive concept and those skilled in the art will be able to make various modifications, additions and substitutions to the specific embodiments described without departing from the scope of the invention as defined in the accompanying claims.
The experimental methods used in the following examples are all conventional methods unless otherwise specified.
Reagents, materials and the like used in the following examples are commercially available unless otherwise specified.
The electrochemical performance tests of the sodium-ion batteries in the following examples were all carried out by the New NeWARE battery test system (test voltage 0.01V-3.0V vs. Na + /Na)。
Example 1:
this example prepares a poly (2, 4, 6-tris (thien-2-yl) -1,3, 5-triazine) sodium ion battery anode material with a porous structure as follows:
1. 2.0g of 2-cyanothiophene was dissolved in 30ml of chloroform and cooled to about 0 ℃ in ice slurry. 5.5g of trifluoromethanesulfonic acid were added to the chloroform solution and stirred first at 0 ℃ for 1h and then at room temperature for 24h. Subsequently, samples were taken and the pH adjusted with cold ammonia until 8.0 was exceeded. Finally, the 2,4, 6-tri (thiophene-2-yl) -1,3, 5-triazine is obtained by filtering, washing and drying.
2. 0.49g of the product obtained in step 1 is first dissolved in 10mL of hot 1, 2-dichloroethane. The above solution was then added to 0.8g FeCl 3 1.0mL of nitromethane and 7.0mL of 1, 2-dichloroethane. The autoclave reactor was then sealed, reacted at 140 ℃ for 12h, and then the solid product was filtered and rinsed with ethanol and water. The prepared sample was added to 20ml HCl solution (2 mol L) -1 ) Removing impurities. Then, soxhlet extraction and purification are carried out by adopting methanol-dichloromethane, and vacuum drying is carried out for 24 hours at 180 ℃ to obtain the poly (2, 4, 6-tri (thiophene-2-yl) -1,3, 5-triazine) sodium ion negative electrode material which is named as CPTTA-1.
Example 2:
FeCl of this example 3 The amount used was 1.6g, and the other raw materials, solvents and operation procedures used were the same as in example 1, and the composition was named CPTTA-2.
Both examples utilize the monomer 2,4, 6-tris (thien-2-yl) -1,3, 5-triazine (TTA) for comparison.
Example 3:
the polymer (CPTTA-1, CPTTA-2) materials of the above examples and the monomer (TTA) materials as a comparison were mixed with Ketjen black, a binder (PVDF) in a ratio of 6:2:2, mixing with N-methyl pyrrolidone (NMP) solvent uniformly, coating the mixture on the surface of copper foil, and performing vacuum drying at 120 ℃ for 24 hours to remove the NMP solvent to obtain the working electrode of the sodium ion battery. The corresponding mass loading of active substance is about 1.5mg cm -2 . Glass fiber GF/D is taken as a diaphragm, metal sodium foil is taken as a counter electrode, and electrolyte is 1M NaCF 3 SO 3 Solution (diglyme as solvent). The sodium ion button cell 2032 is assembled in a glove box filled with argon according to the sequence of the cathode shell, the counter electrode, the diaphragm, the electrolyte, the working electrode, the gasket and the spring piece, and then the electrochemical performance of the sodium ion cell is tested in a new wei NEWARE cell test system.
FIG. 1 is a scheme showing the synthesis of poly (2, 4, 6-tris (thien-2-yl) -1,3, 5-triazine) obtained in examples 1 and 2 of the present invention;
FIG. 2 is an SEM photograph of poly (2, 4, 6-tris (thiophen-2-yl) -1,3, 5-triazine) of example 1,2 of the present invention, FIG. a is an SEM photograph of CPTTA-1, FIG. b is an SEM photograph of CPTTA-2, and it can be seen that: CPTTA-2 has a more pronounced, tighter tubular bundle structure than CPTTA-1.
FIG. 3 is the IR spectra of CPTTA-1, CPTTA-2 and TTA obtained in examples 1 and 2, and it can be found that the monomer and the polymer have the same characteristic stretching vibration related to triazine ring and thiophene ring.
FIG. 4 is a comparison of battery rate performance of CPTTA-1, CPTTA-2 and TTA obtained in examples 1 and 2, with test rates of 0.1, 0.2, 0.5, 1,2, 5, 7 and 10 ag -1 It can be seen that CPTTA-2 is at 10A g -1 The discharge capacity is still as high as 393mAh g under the current density -1 . Notably, these values compare monomer to CPTTA-1 corresponds to a much higher value.
Fig. 5 is a comparison graph of the battery cycle performance of CPTTA-1, CPTTA-2 and TTA obtained in examples 1 and 2, and it can be seen that: after 100 cycles of charge and discharge, the cyclic specific capacity of CPTTA-2 is still maintained at 705mAh g -1 Is superior to monomer and CPTTA-1.
Fig. 6 is a plot of the pore size distribution of the CPTTA-2 obtained in example 2, and it can be seen that the resulting triple-mode pores (i.e., macro/meso/micro) coexist in the polymer, which facilitates exposure of the electroactive sites, facilitates ion/electrolyte transfer, and regulates volume expansion during cycling.
FIG. 7 is a thermogravimetric comparison of CPTTA-2 and TTA obtained in example 2. The resulting polymer can be found to have a higher decomposition temperature than the monomer, indicating an increase in its thermal stability.
FIG. 8 shows the results of CPTTA-2 and TTA at 2 Ag in this example 2 -1 The cycle performance under large current density is compared, and it can be seen that: the discharge capacity of CPTTA-2 is still kept at 324mAh g even if the charge-discharge cycle is 1000 times -1 And the cycling stability of the material is much higher than that of a single electrode material.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A method for preparing poly (2, 4, 6-tri (thiophen-2-yl) -1,3, 5-triazine) with porous structure, which is characterized by comprising the following steps:
step 1: dissolving 2-cyanothiophene in chloroform, cooling in an ice bath, adding trifluoromethanesulfonic acid, and stirring and dispersing uniformly; adjusting the pH value of the system by using ammonia water at 5 ℃, filtering, washing and drying to obtain a monomer 2,4, 6-tri (thiophene-2-yl) -1,3, 5-triazine;
step 2: dissolving the product obtained in step 1 in 1, 2-dichloroethane at 50-60 deg.C, and adding the solution to FeCl 3 A mixture of nitromethane and 1, 2-dichloroethane, and then placed in an autoclave reactorSealing in the middle, and reacting for 10-15 h at 140 ℃; after the reaction is finished, filtering and washing the solid product by using ethanol and water, adding the obtained product into HCl solution to remove impurities, performing Soxhlet extraction and purification by using methanol and dichloromethane, and performing vacuum drying to obtain the poly (2, 4, 6-tri (thiophene-2-yl) -1,3, 5-triazine).
2. The method of claim 1, wherein:
in the step 1, the adding proportion of the 2-cyanothiophene, the chloroform and the trifluoromethanesulfonic acid is 1.5-2.5 g: 25-30 mL:5 to 6g.
3. The production method according to claim 1, characterized in that:
in the step 1, ammonia water with the temperature of 5 ℃ is used for adjusting the pH value of the system to 7-10.
4. The method of claim 1, wherein:
in step 2, 0.4 to 0.6g of the product obtained in step 1 is dissolved in 8 to 12mL of 1, 2-dichloroethane at 50 to 60 ℃ and the resulting solution is subsequently added to 0.8 to 2.5g of FeCl 3 0.5 to 1.0mL of nitromethane and 5 to 10mL of 1, 2-dichloroethane.
5. The method of claim 1, wherein:
in the step 2, the concentration of the HCl solution is 1.8-2.3 mol/L, and the using amount is 18-22 mL.
6. A poly (2, 4, 6-tris (thien-2-yl) -1,3, 5-triazine) material having a porous structure, which is obtained by the production method according to any one of claims 1 to 5.
7. Use of a poly (2, 4, 6-tris (thien-2-yl) -1,3, 5-triazine) material having a porous structure according to claim 6, wherein: the material is used as a negative electrode material of a sodium ion battery to improve the stability and the dynamic performance of the sodium ion battery.
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