WO2023063506A1 - 탄소나노튜브 제조용 촉매 및 탄소나노튜브의 제조방법 - Google Patents
탄소나노튜브 제조용 촉매 및 탄소나노튜브의 제조방법 Download PDFInfo
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- carbon nanotubes
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 142
- 239000002041 carbon nanotube Substances 0.000 title claims abstract description 128
- 229910021393 carbon nanotube Inorganic materials 0.000 title claims abstract description 128
- 239000003054 catalyst Substances 0.000 title claims abstract description 81
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 239000002243 precursor Substances 0.000 claims abstract description 77
- 229910052751 metal Inorganic materials 0.000 claims abstract description 30
- 239000002184 metal Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000002904 solvent Substances 0.000 claims abstract description 14
- 238000005507 spraying Methods 0.000 claims abstract description 14
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 7
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 7
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 4
- 239000010941 cobalt Substances 0.000 claims abstract description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 29
- 238000005229 chemical vapour deposition Methods 0.000 claims description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 8
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 239000012159 carrier gas Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 230000002194 synthesizing effect Effects 0.000 claims description 5
- 125000004432 carbon atom Chemical group C* 0.000 claims description 4
- 238000005979 thermal decomposition reaction Methods 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 229930195734 saturated hydrocarbon Natural products 0.000 claims description 3
- 229930195735 unsaturated hydrocarbon Natural products 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 abstract 1
- 238000000197 pyrolysis Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 37
- 239000004020 conductor Substances 0.000 description 28
- 230000000052 comparative effect Effects 0.000 description 26
- 239000000843 powder Substances 0.000 description 14
- 238000001069 Raman spectroscopy Methods 0.000 description 9
- 230000007423 decrease Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 238000001556 precipitation Methods 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 6
- 230000012010 growth Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 5
- 230000003595 spectral effect Effects 0.000 description 5
- 239000012298 atmosphere Substances 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000000349 field-emission scanning electron micrograph Methods 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 239000002048 multi walled nanotube Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 230000007847 structural defect Effects 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- -1 for example Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000002798 polar solvent Substances 0.000 description 2
- 238000007086 side reaction Methods 0.000 description 2
- 239000002109 single walled nanotube Substances 0.000 description 2
- 238000005118 spray pyrolysis Methods 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 238000001237 Raman spectrum Methods 0.000 description 1
- 150000001242 acetic acid derivatives Chemical class 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 150000004703 alkoxides Chemical class 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002079 double walled nanotube Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000007773 growth pattern Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- ZSDSQXJSNMTJDA-UHFFFAOYSA-N trifluralin Chemical compound CCCN(CCC)C1=C([N+]([O-])=O)C=C(C(F)(F)F)C=C1[N+]([O-])=O ZSDSQXJSNMTJDA-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/066—Zirconium or hafnium; Oxides or hydroxides thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/74—Iron group metals
- B01J23/75—Cobalt
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/33—Electric or magnetic properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0018—Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0027—Powdering
- B01J37/0045—Drying a slurry, e.g. spray drying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/04—Mixing
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J37/08—Heat treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
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- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/158—Carbon nanotubes
- C01B32/16—Preparation
- C01B32/162—Preparation characterised by catalysts
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/442—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using fluidised bed process
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present specification relates to a catalyst for producing carbon nanotubes and a method for producing carbon nanotubes.
- the conductive material serves as a passage for electric charges in the battery, and carbon-based conductive materials such as graphite, carbon black, graphene, and carbon nanotubes may be used. In the past, conductive carbon black was mainly used.
- Carbon nanotube is a material having a tubular structure composed of a hexagonal honeycomb lattice in which one carbon atom is bonded to three other carbon atoms, and is in the limelight as a next-generation conductive material for secondary batteries due to its excellent electrical conductivity.
- carbon nanotubes are used as a conductive material, the energy density and lifespan of a secondary battery can be improved and the size of the battery can be reduced.
- existing carbon nanotubes have a problem in that they are difficult to use as a conductive material for a secondary battery due to insufficient solubility in solvents and dispersibility in solvents.
- the description of the present specification is to solve the problems of the prior art described above, and one object of the present specification is to provide a method for preparing a catalyst for preparing carbon nanotubes for preparing carbon nanotubes having excellent electrical conductivity and dispersibility. .
- Another object of the present specification is to provide a method for manufacturing a carbon nanotube for a conductive material for a secondary battery having excellent electrical conductivity and dispersibility.
- Co represents cobalt, an oxide or derivative thereof
- M1 is at least one metal selected from Al, Ca, Si, Ti and Mg, an oxide or derivative thereof
- Zr represents zirconium, an oxide or derivative thereof
- M2 is at least one metal selected from W, V, Mn and Mo, an oxide or derivative thereof, and 0.2 ⁇ x/y ⁇ 2.6 and 6 ⁇ x/z ⁇ 13.
- the step (a) is (a1) preparing a first precursor solution by dissolving a Co precursor, a Zr precursor, and one or more metal precursors selected from Al, Ca, Si, Ti, and Mg in a solvent. step; and (a2) preparing a second precursor solution by adding one or more metal precursors selected from W, V, Mn, and Mo to the first precursor solution.
- the temperature of the first precursor solution may be less than 30 °C.
- the step (a2) may include a step of stirring under a nitrogen atmosphere after introducing the metal precursor.
- the step (b) may include (b1) spraying the precursor solution into the reactor together with air at 1 to 3 bar; and (b2) thermally decomposing the sprayed precursor solution at 600 to 1,000°C.
- Co may represent cobalt, an oxide or derivative thereof.
- the Co may act as a main catalyst in the catalyst for preparing the carbon nanotubes. When synthesizing carbon nanotubes using the catalyst, it can grow into a structure having relatively excellent dispersibility.
- M1 is one or more metals selected from among Al, Ca, Si, Ti and Mg, oxides or derivatives thereof, and Zr may represent zirconium or oxides or derivatives thereof.
- the x/y represents the mole fraction of the main catalyst relative to the support, for example 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8 , 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6 or a range between two of these values. If the x/y mole fraction is lower than the above range, the activity of the catalyst and the resulting synthesis yield of carbon nanotubes may decrease, and the dispersibility of the produced carbon nanotubes may decrease, making them unsuitable as a conductive material for secondary batteries.
- the x/z mole fraction is higher than the above range, production may decrease as growth activity of carbon nanotubes decreases during the reaction due to lack of a cocatalyst, and powder resistance of the synthesized carbon nanotubes decreases, making it a conductive material for secondary batteries. may be inappropriate.
- the step (a) is a step of preparing a precursor solution containing precursors of metal components included in the catalyst for preparing carbon nanotubes, and may include adding the metal precursor to a solvent and then stirring under a nitrogen atmosphere. .
- Step (a) may include (a1) preparing a first precursor solution by dissolving a Co precursor, a Zr precursor, and at least one metal precursor selected from Al, Ca, Si, Ti, and Mg in a solvent; and (a2) preparing a second precursor solution by adding one or more metal precursors selected from W, V, Mn, and Mo to the first precursor solution.
- the order of steps (a1) and (a2) is not limited.
- the step (c) is a step of finally obtaining the prepared catalyst for preparing carbon nanotubes, and the catalyst may be obtained in a powder form, but is not limited thereto.
- the catalyst for producing carbon nanotubes prepared according to the above method can be applied to the production of carbon nanotubes having excellent electrical conductivity and dispersibility.
- An internal temperature of the chemical vapor deposition reactor may be 600 to 1,000 °C. For example, it may be 600°C, 650°C, 700°C, 750°C, 800°C, 850°C, 900°C, 950°C, 1,000°C, or a range between two values thereof. If the temperature of the reactor is excessively low, growth of carbon nanotubes may be impossible or delayed. If the temperature of the reactor is excessively high, the synthesized carbon nanotubes may be thermally decomposed or may not maintain their shape due to mutual coupling.
- the carbon-based gas may be one selected from the group consisting of saturated or unsaturated hydrocarbons having 1 to 4 carbon atoms, carbon monoxide, benzene, and mixtures of two or more thereof, and may be, for example, ethylene, propylene, acetylene, or methane, but is limited thereto it is not going to be
- the bulk density of the carbon nanotube assembly prepared according to the above method may be 0.005 to 0.10 g/ml.
- the apparent density may be measured using powdered carbon nanotubes. If the apparent density is out of the above range, excessive scattering of the carbon nanotubes may occur, or dispersibility and solubility may be insufficient during preparation of the conductive material slurry.
- Raman spectroscopy for analyzing the surface state of the carbon nanotubes can be usefully used.
- Raman spectroscopy refers to obtaining the frequency of molecules from the Raman effect, which is a phenomenon in which scattered light having a difference by the frequency of molecules is generated when excitation light of monochromatic color such as laser light is irradiated. It means spectroscopy, and it is possible to quantify and measure the crystallinity of carbon nanotubes through such Raman spectroscopy.
- the carbon nanotube aggregate can be easily prepared as a slurry and has excellent dispersibility.
- the conductive material for secondary batteries can suppress safety accidents caused by local concentration of current.
- a solution was prepared.
- a second precursor solution was prepared by adding NH 4 VO 3 to the first precursor solution maintained at a temperature of less than 30° C. and stirring under a nitrogen atmosphere. At this time, each precursor was added in a required amount according to the catalyst composition in Table 1 below.
- a catalyst composition was obtained by spraying the second precursor solution into the spray pyrolysis reactor together with air at a rate of 3 L/hr for thermal decomposition. The spray pressure of air was set to 1-3 bar, and the internal temperature of the spray pyrolysis reactor was set to 750°C.
- a catalyst composition was prepared with the same composition and method as in Example 1, except that the temperature of the first precursor solution was maintained at 50°C.
- the catalyst compositions according to Examples and Comparative Examples were introduced into a fluidized bed chemical vapor deposition reactor having a diameter of 350 mm, and the internal temperature of the reactor was elevated to 700 to 800° C. under a nitrogen atmosphere and maintained. Thereafter, carbon nanotubes were synthesized by reacting for 50 minutes while supplying a mixed gas of nitrogen and ethylene at a rate of 150 L/min.
- Example 1 and 2 are FE-SEM images of carbon nanotubes synthesized according to Preparation Example using the catalyst compositions of Example 6 and Comparative Example 1, respectively.
- the carbon nanotubes synthesized using the catalyst compositions of Examples 1 to 6 showed a bundle-shaped structure as shown in FIG. 1, and were excellent in BET specific surface area and powder resistance properties, so that they could be applied as a conductive material for secondary batteries. Confirmed.
- the surface resistance of the carbon nanotubes was measured using a 4-point probe after bar coating. Evaluation of the dispersion of carbon nanotubes was performed by adding carbon nanotubes to N-methylpyrrolidone (NMP) to be 5% by weight and using bead mill equipment. When the viscosity did not drop any more during RRG (Rotate Ring Mill) equipment manufacturing, dispersion evaluation was completed and manufacturing time was measured.
- NMP N-methylpyrrolidone
- the carbon nanotubes synthesized using the catalyst composition of Comparative Example 1 exhibited an entangled structure, so the dispersion preparation time was short, but the dispersion was not properly performed, resulting in lower electrical conductivity compared to Example.
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Abstract
Description
구분 | Co (몰) |
Al (몰) |
Zr (몰) |
V (몰) |
Co/(Al+Zr) (몰분율) |
Co/V (몰분율) |
실시예 1 | 6.59 | 3.20 | 0.83 | 0.76 | 1.64 | 8.67 |
실시예 2 | 6.09 | 3.80 | 1.12 | 0.7 | 1.24 | 8.70 |
실시예 3 | 5.76 | 4.20 | 1.24 | 0.67 | 1.06 | 8.60 |
실시예 4 | 5.36 | 4.68 | 1.38 | 0.62 | 0.88 | 8.65 |
실시예 5 | 4.85 | 5.29 | 1.57 | 0.56 | 0.71 | 8.66 |
실시예 6 | 4.18 | 6.09 | 1.80 | 0.48 | 0.53 | 8.71 |
비교예 1 | 7.70 | 1.87 | 0.55 | 0.89 | 3.18 | 8.65 |
비교예 2 | 2.00 | 8.72 | 2.58 | 0.23 | 0.18 | 8.70 |
비교예 3 | 4.52 | 4.94 | 1.46 | 1.31 | 0.71 | 3.45 |
비교예 4 | 4.97 | 5.42 | 1.60 | 0.29 | 0.71 | 17.14 |
구분 | 탄소나노튜브 구조 | BET 비표면적 (m2/g) | 분체저항 (Ω·cm) |
실시예 1 | Bundle | 152 | 0.035 |
실시예 2 | Bundle | 156 | 0.029 |
실시예 3 | Bundle | 162 | 0.026 |
실시예 4 | Bundle | 169 | 0.025 |
실시예 5 | Bundle | 187 | 0.026 |
실시예 6 | Bundle | 192 | 0.018 |
비교예 1 | Entangle | 105 | 0.046 |
비교예 2 | Bundle | 279 | 0.020 |
비교예 3 | Bundle | 193 | 0.047 |
비교예 4 | Bundle | 242 | 0.047 |
구분 | 표면저항 (Ω/sq) | 제조시간 (hr) |
실시예6 | 190 | 32 |
비교예1 | 300 | 10 |
비교예2 | - | 분산 안됨 |
구분 | 제1 전구체 용액 온도 | 제2 전구체 용액 제조 분위기 | 침전 발생 여부 |
실시예 1 | 30℃ 미만 | 질소 | 미발생 |
비교예 5 | 50℃ | 질소 | 발생 |
비교예 6 | 30℃ 미만 | 대기 | 발생 |
Claims (11)
- (a) 금속 전구체를 용매 중에 용해시켜 전구체 용액을 제조하는 단계;(b) 상기 전구체 용액을 반응기 내부로 분무하여 열분해하는 단계; 및(c) 촉매를 수득하는 단계;를 포함하고,상기 촉매는 하기 식 1로 표시되는 금속 성분을 포함하는, 탄소나노튜브 제조용 촉매의 제조방법:<식 1>Cox:[M1, Zr]y:M2z상기 식에서,Co는 코발트, 그의 산화물 또는 유도체를 나타내고,M1은 Al, Ca, Si, Ti 및 Mg 중에서 선택된 1종 이상의 금속, 그의 산화물 또는 유도체이고,Zr은 지르코늄, 그의 산화물 또는 유도체를 나타내고,M2는 W, V, Mn 및 Mo 중에서 선택된 1종 이상의 금속, 그의 산화물 또는 유도체이고,0.2≤x/y≤2.6, 6≤x/z≤13이다.
- 제1항에 있어서,상기 (a) 단계는(a1) Co 전구체, Zr 전구체, 및 Al, Ca, Si, Ti 및 Mg 중에서 선택된 1종 이상의 금속 전구체를 용매 중에 용해시켜 제1 전구체 용액을 제조하는 단계; 및(a2) 상기 제1 전구체 용액에 W, V, Mn 및 Mo 중에서 선택된 1종 이상의 금속 전구체를 투입하여 제2 전구체 용액을 제조하는 단계;를 포함하는, 탄소나노튜브 제조용 촉매의 제조방법.
- 제2항에 있어서,상기 (a2) 단계에서, 상기 제1 전구체 용액의 온도는 30℃ 미만인, 탄소나노튜브 제조용 촉매의 제조방법.
- 제2항에 있어서,상기 (a2) 단계에서, 상기 금속 전구체를 투입한 후, 질소 분위기 하에서 교반하는 단계를 포함하는, 탄소나노튜브 제조용 촉매의 제조방법.
- 제1항에 있어서,상기 (b) 단계는(b1) 상기 전구체 용액을 1~3 bar의 공기와 함께 반응기 내부로 분무하는 단계; 및(b2) 분무된 상기 전구체 용액을 600~1,000℃에서 열분해하는 단계;를 포함하는, 탄소나노튜브 제조용 촉매의 제조방법.
- 제1항에 있어서,상기 식에서, 0.5≤x/y≤2.0, 8≤x/z≤9인, 탄소나노튜브 제조용 촉매의 제조방법.
- (1) 제1항에 따라 제조한 탄소나노튜브 제조용 촉매를 화학기상증착 반응기에 투입하는 단계; 및(2) 탄소계 가스 및 운반 가스를 분사하여 탄소나노튜브를 합성하는 단계;를 포함하는, 탄소나노튜브의 제조방법.
- 제7항에 있어서,상기 화학기상증착 반응기는 유동층 화학기상증착 반응기인, 탄소나노튜브의 제조방법.
- 제7항에 있어서,상기 화학기상증착 반응기의 내부 온도는 600~1,000℃인, 탄소나노튜브의 제조방법.
- 제7항에 있어서,상기 탄소계 가스는 탄소수 1~4의 포화 또는 불포화 탄화수소, 일산화탄소, 벤젠 및 이들 중 2 이상의 혼합물로 이루어진 군에서 선택된 하나인, 탄소나노튜브의 제조방법.
- 제7항에 있어서,상기 운반 가스는 헬륨, 질소, 아르곤 및 이들 중 2 이상의 혼합물로 이루어진 군에서 선택된 하나인, 탄소나노튜브의 제조방법.
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