# US 2021/0276871 A1 · Carbon nanotube composition and method of preparing the same

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- Number: US 2021/0276871 A1
- Document ID: US20210276871A1
- Status: Published application
- Kind: A1
- Application number: 16/624,743
- Filed: 2018-11-27
- Published: 2021-09-09
- Earliest claimed: 2017-12-26
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Sung Jin Kim; Jae Keun Yoon; Dong Hyun Cho
- Web page: https://patentgrep.com/patent/US20210276871A1

## CPC

- C01B 32/158: Carbon nanotubes
- C01B 32/162: characterised by catalysts
- B01J 21/04: Alumina
- B01J 23/847: Vanadium, niobium or tantalum {or polonium}
- B01J 23/8472: {Vanadium}
- B01J 37/0217: {Pretreatment of the substrate before coating}
- B01J 37/0221: {of particles}
- B01J 37/04: Mixing {(B01J37/0009, B01J37/0018 take precedence)}
- B01J 37/08: Heat treatment {(B01J37/0009, B01J37/0018 take precedence)}
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- B82Y 40/00: Manufacture or treatment of nanostructures
- C01B 2202/22: Electronic properties
- C01B 2202/26: Mechanical properties
- C01B 2202/32: Specific surface area
- C01B 2202/36: Diameter
- C01P 2002/70: defined by measured X-ray, neutron or electron diffraction data
- C01P 2002/78: by stacking-plane distances or stacking sequences
- C01P 2004/50: Agglomerated particles
- C01P 2006/11: Powder tap density
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

The present invention relates to a carbon nanotube composition including entangled-type carbon nanotubes and bundle-type carbon nanotubes, wherein the carbon nanotube composition has a specific surface area of 190 m2/g to 240 m2/g and a ratio of specific surface area to bulk density of 0.1 to 5.29.

## Claims

### Claim 1

A carbon nanotube composition comprising entangled-type carbon nanotubes and bundle-type carbon nanotubes,
wherein the carbon nanotube composition has a specific surface area of 190 m2/g to 240 m2/g and satisfies the following Equation 1:
0.1≤X/Y≤5.29 <Equation 1>
wherein, in Equation 1, X is a number representing a specific surface area of the carbon nanotube composition, and
Y is a number representing a bulk density of the carbon nanotube composition,
wherein a unit of the specific surface area is m2/g, and a unit of the bulk density is kg/m3.

### Claim 2 (depends on 1)

The carbon nanotube composition of claim 1, wherein the specific surface area of the carbon nanotube composition is 193 m2/g to 239 m2/g.

### Claim 3 (depends on 1)

The carbon nanotube composition of claim 1, wherein the specific surface area of the carbon nanotube composition is 195 m2/g to 239 m2/g.

### Claim 4 (depends on 1)

The carbon nanotube composition of claim 1, wherein, the value of Equation 1 is 1 to 5.14.

### Claim 5 (depends on 1)

The carbon nanotube composition of claim 1, wherein, the value of Equation 1 is 1.5 to 5.

### Claim 6 (depends on 1)

The carbon nanotube composition of claim 1, wherein the bulk density of the carbon nanotube composition is 25 kg/m3 to 150 kg/m3.

### Claim 7 (depends on 1)

The carbon nanotube composition of claim 1, wherein the bulk density of the carbon nanotube composition is 35 kg/m3 to 130 kg/m3.

### Claim 8 (depends on 1)

The carbon nanotube composition of claim 1, wherein the carbon nanotube composition comprises carbon nanotube units having an average diameter of 10 nm to 30 nm.

### Claim 9 (depends on 8)

The carbon nanotube composition of claim 8, wherein the carbon nanotube units have an interlayer distance (d002) of a carbon crystal of 0.335 nm to 0.342 nm, wherein the interlayer distance is obtained by X-ray diffraction,
the carbon nanotube units satisfy the following condition: interlayer distance (d002)<0.3448-0.0028 (log φ) wherein φ is an average diameter of the carbon nanotube units, and
the carbon nanotube units have a thickness (Lc) in a C-axis direction of the crystal of 40 nm or less.

### Claim 10

A method of preparing a carbon nanotube composition, the method comprising:
mixing an organic acid and a vanadium precursor in a molar ratio of 1:0.088 to 1:0.605 to prepare a mixture;
mixing the mixture with a cobalt precursor to prepare a catalyst precursor;
performing first heat treatment on aluminum hydroxide to prepare a support;
supporting the catalyst precursor on the support and then performing second heat treatment on the resulting support to prepare a supported catalyst; and
reacting the supported catalyst with a carbon-based compound.

### Claim 11 (depends on 10)

The method of claim 10, wherein the preparing of the mixture comprises mixing an organic acid and a vanadium precursor in a molar ratio of 1:0.09 to 1:0.6.

### Claim 12 (depends on 10)

The method of claim 10, wherein, in the preparing of the catalyst precursor, the mixture and the cobalt precursor are mixed such that a molar ratio of vanadium to cobalt is in a range of 1:1 to 1:100.

### Claim 13 (depends on 10)

The method of claim 10, wherein the organic acid comprises one or more selected from the group consisting of citric acid, tartaric acid, fumaric acid, malic acid, acetic acid, butyric acid, palmitic acid, and oxalic acid.

### Claim 14 (depends on 10)

The method of claim 10, wherein the vanadium precursor comprises one or more selected from the group consisting of NH4VO3, NaVO3, V2O5, and V(C5H7O2)3.

### Claim 15 (depends on 10)

The method of claim 10, wherein the second heat treatment is performed at a pressure of 0.1 bar to 2 bar, wherein the pressure is a pressure additionally applied at atmospheric pressure.