CN114703405B - High-strength high-conductivity Al-Fe-La-Cu aluminum alloy foil and preparation method thereof - Google Patents
High-strength high-conductivity Al-Fe-La-Cu aluminum alloy foil and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-strength high-conductivity Al-Fe-La-Cu aluminum alloy foil and a preparation method thereof. The alloy powder is prepared from the following raw materials in percentage by weight: 0.06-0.3% of iron, 0.06-0.2% of lanthanum, 0-0.3% of copper and the balance of aluminum; the alloy powder is prepared by compounding, melting and blending metal iron, lanthanum, copper and aluminum, and the iron and the copper are added to enhance the strength of the aluminum alloy composite foil, the lanthanum is added to refine alloy grains, the microstructure of the aluminum alloy composite foil is improved, the conductive efficiency of the aluminum alloy composite foil is improved, the specific surface area and the porosity of the aluminum alloy composite foil are improved by compounding the microporous material and the reinforcing filler, the loss of electrolyte can be effectively reduced, the service life of a lithium battery is ensured, the conductivity of the material is improved, the charge-discharge multiplying power performance of the lithium battery is improved, and the electrode strength is enhanced.
Description
Technical Field
The invention relates to the technical field of conductive material preparation, in particular to a high-strength high-conductivity Al-Fe-La-Cu aluminum alloy foil and a preparation method thereof.
Background
With the rapid consumption of non-renewable energy sources such as petroleum and natural gas and the increasing deterioration of ecological environment, before new clean energy sources capable of supporting sustainable development of economy and society appear, mankind can only make efforts to continuously improve the use efficiency of energy, and therefore, higher and higher requirements on energy storage and release are put forward. The lithium ion battery has the characteristics of high energy density, high charging and discharging efficiency, good cycling stability, wide working temperature range, high working voltage, small self-discharge, no memory effect, safety, environmental protection and the like, and becomes an ideal energy storage device in the 21 st century.
The aluminum alloy foil for the positive electrode current collector mainly plays a role in conducting electricity and supporting the positive electrode to coat active substances in the lithium ion battery, and has no direct help to the capacity of the lithium ion battery. Therefore, two main performance indexes of the aluminum alloy foil for the current collector are tensile strength and electric conductivity, and the aluminum alloy foil with good comprehensive performance of tensile strength and electric conductivity is the positive current collector material required by the lithium ion battery. In order to reduce the weight of the lithium ion battery and increase the specific energy of the lithium ion battery, more positive active materials need to be coated on a thinner current collector foil, which requires higher strength of the aluminum alloy foil even at a lower thickness and good conductivity of the aluminum alloy foil, and thus an aluminum alloy composite foil with high strength and high conductivity is required to solve the problem.
Disclosure of Invention
The invention aims to provide a high-strength high-conductivity Al-Fe-La-Cu aluminum alloy foil and a preparation method thereof, and solves the problem that the charge-discharge rate performance of a lithium battery is influenced due to the common conductivity of an electrode material of the lithium battery at the present stage.
The purpose of the invention can be realized by the following technical scheme:
a high-strength high-conductivity Al-Fe-La-Cu aluminium alloy foil is prepared from alloy powder, reinforcing filler and microporous material through compounding.
The alloy powder is prepared from the following raw materials in percentage by weight: 0.06-0.3% of iron, 0.06-0.2% of lanthanum, 0-0.3% of copper and the balance of aluminum.
The alloy powder is prepared by the following steps:
melting and blending metal iron, lanthanum, copper and aluminum to prepare blended alloy, homogenizing the blended alloy at 580-600 ℃ for 7-9h to prepare conductive alloy, and ball-milling the conductive alloy to prepare alloy powder.
Further, the reinforcing filler is prepared by the following steps:
dissolving citric acid in deionized water, stirring for 1-2h at the rotation speed of 200-300r/min and the temperature of 60-80 ℃ to prepare a citric acid solution, dispersing carbon nanotubes in the deionized water, adding monolauryl phosphate, stirring and adding the citric acid solution at the rotation speed of 150-200r/min and the temperature of 25-30 ℃, heating to the temperature of 160-200 ℃, reacting for 20-25h, filtering to remove filtrate, and drying a substrate to prepare the reinforcing filler.
Furthermore, the mass ratio of the citric acid to the carbon nano tube to the monolauryl phosphate is 1.
Further, the microporous material is prepared by the following steps:
step A1: mixing 1,4,5, 8-naphthalene tetracarboxylic anhydride and fuming sulfuric acid, stirring and adding iodine under the conditions that the rotating speed is 150-200r/min and the temperature is 20-25 ℃, adding sodium bromide after stirring for 3-5h, heating to 80-85 ℃, reacting for 20-25h, continuing heating until reactants reflux, continuing reacting for 20-25h, and filtering to remove filtrate under the condition of ice water bath to obtain an intermediate 1;
the reaction process is as follows:
step A2: uniformly mixing the intermediate 1, cuprous cyanide and tetrahydrofuran, performing reflux reaction for 20-25h at the temperature of 150-160 ℃, distilling to remove the solvent, adding deionized water, filtering to remove the filtrate to obtain an intermediate 2, uniformly mixing the intermediate 2, 5-amino isophthalic acid, tetrabutylammonium bromide and tetrahydrofuran, reacting for 10-15h at the rotation speed of 300-500r/min and the temperature of 115-125 ℃, cooling to room temperature, adding the reaction solution into diethyl ether, filtering to remove the filtrate to obtain an intermediate 3;
the reaction process is as follows:
step A3: mixing the intermediate 3, nickel acetate tetrahydrate and ethanol, performing ultrasonic dispersion for 30-40min, standing for 20-25h, filtering to remove filtrate, adding a filter cake and zinc chloride into an ampoule, vacuumizing and sealing, putting the ampoule into a muffle furnace, preserving heat for 35-45h at 500-600 ℃, opening the ampoule, adding a product into a hydrochloric acid solution, stirring for 15-20h at the rotation speed of 200-300r/min, performing Soxhlet extraction for 20-25h by using tetrahydrofuran and deionized water, and roasting a substrate for 2-3h at the temperature of 1000 ℃ to obtain the microporous material.
Further, 1,4,5, 8-naphthalene tetracarboxylic anhydride and sodium bromide in the step A1 are used in a molar ratio of 1.
Further, the amount ratio of the intermediate 1, cuprous cyanide and tetrahydrofuran in step A2 is 0.05mol.
Further, the dosage ratio of the intermediate 3, nickel acetate tetrahydrate and ethanol in step A3 is 0.8g.
A preparation method of a high-strength high-conductivity Al-Fe-La-Cu aluminum alloy foil specifically comprises the following steps:
and mixing the alloy powder, the reinforcing filler, the microporous material, the polyvinylidene fluoride and the N-methyl-2-pyridine, stirring for 5-7 hours at the rotation speed of 600-800r/min, and coating and drying the slurry to obtain the aluminum alloy composite foil.
Further, the use amount mass ratio of the alloy powder, the reinforcing filler, the microporous material and the polyvinylidene fluoride is (2).
The invention has the beneficial effects that: the high-strength high-conductivity Al-Fe-La-Cu aluminum alloy foil is prepared by compounding alloy powder, reinforcing filler and a microporous material, wherein the alloy powder is prepared by compounding, melting and blending metal iron, lanthanum, copper and aluminum to prepare iron and copper, the strength of the aluminum alloy composite foil can be enhanced, alloy grains can be refined by adding lanthanum, the microstructure of the aluminum alloy composite foil is improved, and the conductive efficiency of the aluminum alloy composite foil is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A preparation method of a high-strength high-conductivity Al-Fe-La-Cu aluminum alloy foil specifically comprises the following steps:
and mixing the alloy powder, the reinforcing filler, the microporous material, the polyvinylidene fluoride and the N-methyl-2-pyridine, stirring for 5 hours at the rotating speed of 600r/min, and coating and drying the slurry to obtain the aluminum alloy composite foil.
The alloy powder, the reinforcing filler, the microporous material and the polyvinylidene fluoride are used in a mass ratio of (2).
The alloy powder is prepared from the following raw materials in percentage by weight: 0.06% of iron, 0.06% of lanthanum, 0% of copper and the balance of aluminum.
The alloy powder is prepared by the following steps:
the preparation method comprises the steps of melting and blending metal iron, lanthanum, copper and aluminum to prepare blended alloy, homogenizing the blended alloy at 580 ℃ for 7 hours to prepare conductive alloy, and performing ball milling on the conductive alloy to prepare alloy powder.
The reinforcing filler is prepared by the following steps:
dissolving citric acid in deionized water, stirring for 1h at the rotation speed of 200r/min and the temperature of 60 ℃ to prepare a citric acid solution, dispersing carbon nano tubes in the deionized water, adding monolauryl phosphate, stirring and adding the citric acid solution at the rotation speed of 150r/min and the temperature of 25 ℃, heating to the temperature of 160 ℃, reacting for 20h, filtering to remove filtrate, and drying a substrate to prepare the reinforcing filler.
The mass ratio of the citric acid to the carbon nano tube to the monolauryl phosphate is 1.
The microporous material is prepared by the following steps:
step A1: mixing 1,4,5, 8-naphthalene tetracarboxylic anhydride and fuming sulfuric acid, stirring and adding iodine under the conditions that the rotation speed is 150r/min and the temperature is 20 ℃, adding sodium bromide after stirring for 3 hours, heating to the temperature of 80 ℃, continuously heating to reflux the reactants after reacting for 20 hours, continuously reacting for 20 hours, and filtering to remove filtrate under the condition of ice-water bath to obtain an intermediate 1;
step A2: uniformly mixing cuprous cyanide and tetrahydrofuran, performing reflux reaction at the temperature of 150 ℃ for 20 hours, distilling to remove the solvent, adding deionized water, filtering to remove filtrate to obtain an intermediate 2, uniformly mixing the intermediate 2, 5-aminoisophthalic acid, tetrabutylammonium bromide and tetrahydrofuran, reacting at the rotation speed of 300r/min and the temperature of 115 ℃ for 10 hours, cooling to room temperature, adding a reaction solution into diethyl ether, and filtering to remove the filtrate to obtain an intermediate 3;
step A3: mixing the intermediate 3, nickel acetate tetrahydrate and ethanol, performing ultrasonic dispersion for 30min, standing for 20h, filtering to remove filtrate, adding a filter cake and zinc chloride into an ampoule, vacuumizing and sealing, placing the ampoule into a muffle furnace, preserving heat for 35h at 500 ℃, opening the ampoule, adding a product into a hydrochloric acid solution, stirring for 15h at the rotation speed of 200r/min, performing Soxhlet extraction for 20h by using tetrahydrofuran and deionized water, and roasting a substrate for 2h at the temperature of 1000 ℃ to prepare the microporous material.
The molar ratio of the 1,4,5, 8-naphthalene tetracarboxylic anhydride and the sodium bromide in the step A1 is 1.
The use ratio of the intermediate 1, cuprous cyanide and tetrahydrofuran in the step A2 is 0.05mol.
The dosage ratio of the intermediate 3, the nickel acetate tetrahydrate and the ethanol in the step A3 is 0.8g.
Example 2
A preparation method of a high-strength high-conductivity Al-Fe-La-Cu aluminum alloy foil specifically comprises the following steps:
and mixing the alloy powder, the reinforcing filler, the microporous material, the polyvinylidene fluoride and the N-methyl-2-pyridine, stirring for 6 hours at the rotating speed of 600r/min, and coating and drying the slurry to obtain the aluminum alloy composite foil.
The alloy powder, the reinforcing filler, the microporous material and the polyvinylidene fluoride are used in a mass ratio of (2).
The alloy powder is prepared from the following raw materials in percentage by weight: 0.2% of iron, 0.15% of lanthanum, 0.15% of copper and the balance of aluminum.
The alloy powder is prepared by the following steps:
the preparation method comprises the steps of melting and blending metal iron, lanthanum, copper and aluminum to prepare blended alloy, homogenizing the blended alloy at 590 ℃ for 8 hours to prepare conductive alloy, and performing ball milling on the conductive alloy to prepare alloy powder.
The reinforcing filler is prepared by the following steps:
dissolving citric acid in deionized water, stirring for 1.5 hours at the rotation speed of 300r/min and the temperature of 70 ℃ to prepare a citric acid solution, dispersing carbon nano tubes in the deionized water, adding monolauryl phosphate, stirring and adding the citric acid solution at the rotation speed of 180r/min and the temperature of 28 ℃, heating to the temperature of 180 ℃, reacting for 23 hours, filtering to remove filtrate, and drying a substrate to prepare the reinforced filler.
The mass ratio of the citric acid to the carbon nano tube to the monolauryl phosphate is 1.
The microporous material is prepared by the following steps:
step A1: mixing 1,4,5, 8-naphthalene tetracarboxylic anhydride and fuming sulfuric acid, stirring and adding iodine under the conditions that the rotation speed is 180r/min and the temperature is 23 ℃, adding sodium bromide after stirring for 3-5 hours, heating to 83 ℃, continuing to heat until reactants reflux after reacting for 23 hours, continuing to react for 23 hours, and filtering to remove filtrate under the condition of ice-water bath to obtain an intermediate 1;
step A2: uniformly mixing cuprous cyanide and tetrahydrofuran, performing reflux reaction at the temperature of 155 ℃ for 23 hours, distilling to remove the solvent, adding deionized water, filtering to remove the filtrate to obtain an intermediate 2, uniformly mixing the intermediate 2, 5-aminoisophthalic acid, tetrabutylammonium bromide and tetrahydrofuran, reacting at the rotation speed of 300r/min and the temperature of 120 ℃ for 13 hours, cooling to room temperature, adding the reaction solution into diethyl ether, and filtering to remove the filtrate to obtain an intermediate 3;
step A3: mixing the intermediate 3, nickel acetate tetrahydrate and ethanol, performing ultrasonic dispersion for 35min, standing for 23h, filtering to remove filtrate, adding a filter cake and zinc chloride into an ampoule, vacuumizing and sealing, placing the ampoule into a muffle furnace, preserving heat for 40h at 550 ℃, opening the ampoule, adding a product into a hydrochloric acid solution, stirring for 15-20h at the rotation speed of 200-300r/min, performing Soxhlet extraction for 20-25h by using tetrahydrofuran and deionized water, and roasting a substrate for 2-3h at 1000 ℃ to obtain the microporous material.
The molar ratio of the 1,4,5, 8-naphthalene tetracarboxylic anhydride and the sodium bromide in the step A1 is 1.
The use ratio of the intermediate 1, cuprous cyanide and tetrahydrofuran in the step A2 is 0.05mol.
The dosage ratio of the intermediate 3, the nickel acetate tetrahydrate and the ethanol in the step A3 is 0.8g.
Example 3
A preparation method of a high-strength high-conductivity Al-Fe-La-Cu aluminum alloy foil specifically comprises the following steps:
and mixing the alloy powder, the reinforcing filler, the microporous material, the polyvinylidene fluoride and the N-methyl-2-pyridine, stirring for 7 hours at the rotating speed of 800r/min, and coating and drying the slurry to obtain the aluminum alloy composite foil.
The alloy powder, the reinforcing filler, the microporous material and the polyvinylidene fluoride are used in a mass ratio of 2.
The alloy powder is prepared from the following raw materials in percentage by weight: 0.3% of iron, 0.2% of lanthanum, 0.3% of copper and the balance of aluminum.
The alloy powder is prepared by the following steps:
melting and blending metal iron, lanthanum, copper and aluminum to prepare blended alloy, homogenizing the blended alloy at 600 ℃ for 9 hours to prepare conductive alloy, and performing ball milling on the conductive alloy to prepare alloy powder.
The reinforcing filler is prepared by the following steps:
dissolving citric acid in deionized water, stirring for 2 hours at the rotating speed of 300r/min and the temperature of 80 ℃ to prepare a citric acid solution, dispersing carbon nano tubes in the deionized water, adding monolauryl phosphate, stirring and adding the citric acid solution at the rotating speed of 200r/min and the temperature of 30 ℃, heating to the temperature of 200 ℃, reacting for 25 hours, filtering to remove filtrate, and drying a substrate to prepare the reinforcing filler.
The mass ratio of the citric acid to the carbon nano tube to the monolauryl phosphate is 1.
The microporous material is prepared by the following steps:
step A1: mixing 1,4,5, 8-naphthalene tetracarboxylic anhydride and fuming sulfuric acid, stirring and adding iodine under the conditions that the rotating speed is 200r/min and the temperature is 25 ℃, adding sodium bromide after stirring for 5 hours, heating to 85 ℃, continuing to heat until reactants reflux after reacting for 25 hours, continuing to react for 25 hours, and filtering to remove filtrate under the condition of ice-water bath to obtain an intermediate 1;
step A2: uniformly mixing cuprous cyanide and tetrahydrofuran, carrying out reflux reaction at 160 ℃ for 25h, distilling to remove the solvent, adding deionized water, filtering to remove the filtrate to obtain an intermediate 2, uniformly mixing the intermediate 2, 5-aminoisophthalic acid, tetrabutylammonium bromide and tetrahydrofuran, reacting at the rotation speed of 500r/min and the temperature of 125 ℃ for 15h, cooling to room temperature, adding the reaction solution into diethyl ether, and filtering to remove the filtrate to obtain an intermediate 3;
step A3: mixing the intermediate 3, nickel acetate tetrahydrate and ethanol, ultrasonically dispersing for 40min, standing for 25h, filtering to remove filtrate, adding a filter cake and zinc chloride into an ampoule, vacuumizing and sealing, putting the ampoule into a muffle furnace, preserving heat for 45h at the temperature of 600 ℃, opening the ampoule, adding a product into a hydrochloric acid solution, stirring for 20h at the rotation speed of 300r/min, performing Soxhlet extraction for 25h by using tetrahydrofuran and deionized water, and roasting a substrate for 3h at the temperature of 1000 ℃ to obtain the microporous material.
The molar ratio of the 1,4,5, 8-naphthalene tetracarboxylic anhydride and the sodium bromide in the step A1 is 1.
The using ratio of the intermediate 1, cuprous cyanide and tetrahydrofuran in the step A2 is 0.05mol.
The dosage ratio of the intermediate 3, the nickel acetate tetrahydrate and the ethanol in the step A3 is 0.8g.
Comparative example 1
The comparative example is a lithium battery anode material disclosed in the Chinese patent CN 111446438A.
Comparative example 2
The comparative example is a lithium battery anode material disclosed in Chinese patent CN 112447961A.
The aluminum alloy composite foil prepared in the example 1-3 is made into a positive plate, the positive plate and the positive material prepared in the comparative example 1-2 are assembled to manufacture a laminated soft package battery, and a charge and discharge test is carried out to compare the first effect, the internal resistance and the initial capacity of the battery.
The test method comprises the following steps: at normal temperature, charging is carried out in a constant-current constant-voltage charging mode, the limiting current is 0.5C, the final voltage is 3.65V, the final current is 3.5A, discharging is carried out in a constant-current discharging mode, the discharging current is 1C, the cut-off voltage of discharging is 2.5V, the discharging is carried out for 2000 cycles, the initial discharging capacity, the discharging capacity for 2000 cycles and the capacity retention rate after 2000 cycles are respectively calculated, and the results are shown in the following table;
from the above table, it can be seen that the laminated soft package battery prepared from the aluminum alloy composite foil prepared in the examples 1 to 3 has the initial discharge capacity of 318.4 to 326.1mAh/g, the discharge capacity of 261.0 to 277.2mAh/g after 2000 cycles, the capacity retention rate of 82 to 85 percent, and the surface of the invention has a good conductive effect.
The foregoing is illustrative and explanatory only of the present invention, and it is intended that the present invention cover modifications, additions, or substitutions by those skilled in the art, without departing from the spirit of the invention or exceeding the scope of the claims.
Claims (5)
1. A high-strength high-conductivity Al-Fe-La-Cu aluminum alloy composite foil is characterized in that: is prepared by compounding alloy powder, reinforcing filler and microporous material;
the alloy powder is prepared from the following raw materials in percentage by weight: 0.06-0.3% of iron, 0.06-0.2% of lanthanum, 0-0.3% of copper and the balance of aluminum;
the alloy powder is prepared by the following steps:
melting and blending metal iron, lanthanum, copper and aluminum to prepare blended alloy, homogenizing the blended alloy at 580-600 ℃ for 7-9h to prepare conductive alloy, and ball-milling the conductive alloy to prepare alloy powder;
the reinforcing filler is prepared by the following steps:
dissolving citric acid in deionized water to prepare a citric acid solution, dispersing carbon nano tubes in the deionized water, adding monolauryl phosphate, stirring, adding the citric acid solution, heating for reaction, filtering to remove filtrate, and drying a substrate to prepare a reinforced filler;
the microporous material is prepared by the following steps:
step A1: mixing 1,4,5, 8-naphthalene tetracarboxylic anhydride and fuming sulfuric acid, stirring, adding iodine, stirring, adding sodium bromide, heating for reaction, continuously heating until reactants flow back, continuously reacting, and filtering to remove filtrate under the condition of ice water bath to obtain an intermediate 1;
step A2: mixing cuprous cyanide and tetrahydrofuran, performing reflux reaction, distilling to remove the solvent, adding deionized water, filtering to remove the filtrate to obtain an intermediate 2, mixing the intermediate 2, 5-aminoisophthalic acid, tetrabutylammonium bromide and tetrahydrofuran, reacting, cooling to room temperature, adding the reaction solution into diethyl ether, filtering to remove the filtrate to obtain an intermediate 3;
step A3: mixing the intermediate 3, nickel acetate tetrahydrate and ethanol, performing ultrasonic dispersion, standing, filtering to remove filtrate, adding a filter cake and zinc chloride into an ampoule, vacuumizing and sealing, putting the ampoule into a muffle furnace, performing heat preservation treatment, opening the ampoule, adding a product into a hydrochloric acid solution, stirring, performing Soxhlet extraction by using tetrahydrofuran and deionized water, and roasting a substrate to obtain a microporous material;
mixing alloy powder, a reinforcing filler, a microporous material, polyvinylidene fluoride and N-methyl-2-pyridine, stirring for 5-7 hours at the rotating speed of 600-800r/min, and coating and drying slurry to obtain an aluminum alloy composite foil;
the alloy powder, the reinforcing filler, the microporous material and the polyvinylidene fluoride are used in a mass ratio of 2.
2. The Al-Fe-La-Cu aluminum alloy composite foil with high strength and high conductivity as claimed in claim 1, wherein: the mass ratio of the citric acid to the carbon nano tube to the monolauryl phosphate is 1.
3. The Al-Fe-La-Cu aluminum alloy composite foil with high strength and high conductivity as claimed in claim 1, wherein: the molar ratio of the 1,4,5, 8-naphthalene tetracarboxylic anhydride and the sodium bromide in the step A1 is 1.
4. The Al-Fe-La-Cu aluminum alloy composite foil with high strength and high conductivity as claimed in claim 1, wherein: the use ratio of the intermediate 1, cuprous cyanide and tetrahydrofuran in the step A2 is 0.05mol.
5. The Al-Fe-La-Cu aluminum alloy composite foil with high strength and high conductivity as claimed in claim 1, wherein: the dosage ratio of the intermediate 3, the nickel acetate tetrahydrate and the ethanol in the step A3 is 0.8g.
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| CN113881041A (en) * | 2021-11-18 | 2022-01-04 | 西湖大学 | Method for large-scale preparation of high-crystallization high-specific-surface-area covalent triazine framework |
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| JP2008223090A (en) * | 2007-03-13 | 2008-09-25 | Sumitomo Light Metal Ind Ltd | Aluminum alloy foil for electrolytic capacitor electrode |
| CN102064311A (en) * | 2010-12-08 | 2011-05-18 | 清华大学 | Preparation method of carbon nanometer tube metal particle composite |
| CN102676860A (en) * | 2012-05-23 | 2012-09-19 | 天津大学 | Preparation method of carbon nanotube reinforced Al-matrix composite |
| CN102775457A (en) * | 2012-08-08 | 2012-11-14 | 河北大学 | Nucleoside dinaphthalene diimide derivative, and synthetic method and application thereof |
| WO2019020086A1 (en) * | 2017-07-28 | 2019-01-31 | 中国石油化工股份有限公司 | Carbon-coated transition metal nanocomposite material, and preparation and use thereof |
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| CN111139378A (en) * | 2020-01-19 | 2020-05-12 | 上海华峰铝业股份有限公司 | Aluminum foil for high-strength high-conductivity current collector and preparation method thereof |
| CN113881041A (en) * | 2021-11-18 | 2022-01-04 | 西湖大学 | Method for large-scale preparation of high-crystallization high-specific-surface-area covalent triazine framework |
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