Carbon nanotube composite and method for preparing the same

Patent metadata

Field	Value
Publication number	US-2025042746-A1
Application number	US-202318486319-A
Country	US
Kind code	A1
Filing date	Oct 13, 2023
Priority date	Jul 31, 2023
Publication date	Feb 6, 2025
Grant date	—

Abstract

The present disclosure describes to a method embodiment for preparing a carbon nanotube composite that includes performing a first ultrasonic treatment on a first mixture containing a carbon nanotube (CNT) fiber and an acid to form a carbon nanotube fiber swollen body, and performing a second ultrasonic treatment on a second mixture containing the carbon nanotube fiber swollen body, an aromatic monomer, and an initiator to form a carbon nanotube composite including a surface coated with an aromatic monomer-derived conductive polymer, and an embodiment of the carbon nanotube composite prepared therefrom.

First claim

What is claimed is:

1 . A method for preparing a carbon nanotube composite, the method comprising:
performing a first ultrasonic treatment on a first mixture, the first mixture containing a carbon nanotube (CNT) fiber and an acid, to form a carbon nanotube fiber swollen body; and performing a second ultrasonic treatment on a second mixture, the second mixture containing the carbon nanotube fiber swollen body, an aromatic monomer, and an initiator, to form a carbon nanotube composite including a surface coated with an aromatic monomer-derived conductive polymer.

2 . The method of claim 1 , wherein the acid comprises an inorganic acid.

3 . The method of claim 2 , wherein the acid contains sulfuric acid and nitric acid.

4 . The method of claim 3 , wherein the acid contains the sulfuric acid and the nitric acid in a volume ratio from 2:1 to 4:1.

5 . The method of claim 1 , wherein the first ultrasonic treatment is performed with an ultrasonic wave having a first frequency in a range from 20 kHz to 50 kHz, for 2 to 4 hours, and wherein the second ultrasonic treatment is performed with an ultrasonic wave having a second frequency in a range from 30 kHz to 50 kHz, for 2 to 4 hours.

6 . The method of claim 1 , wherein the conductive polymer contains a repeating unit containing nitrogen or sulfur, inside or outside an aromatic ring in a main chain.

7 . The method of claim 6 , wherein the conductive polymer includes one of or any combination of an aniline-based polymer, a pyrrole-based polymer, a thiophene polymer, and a poly(phenylene sulfide)-based polymer.

8 . The method of claim 1 , wherein the second mixture contains 20000 to 25000 parts by weight of the aromatic monomer relative to 100 parts by dry weight of the carbon nanotube fiber swollen body.

9 . The method of claim 1 , wherein a linear density of the carbon nanotube fiber swollen body is 110 to 140% of a linear density of the carbon nanotube fiber.

10 . The method of claim 1 , wherein an average diameter of a cross-section perpendicular to a longitudinal direction of the carbon nanotube fiber swollen body is 150 to 250% of an average diameter of a cross-section perpendicular to a longitudinal direction of the carbon nanotube fiber.

11 . The method of claim 1 , wherein an average pore diameter of the carbon nanotube fiber swollen body is 120 to 160% of an average pore diameter of the carbon nanotube fiber.

12 . The method of claim 1 , wherein a surface oxygen content of the carbon nanotube fiber swollen body is 150 to 450% of a surface oxygen content of the carbon nanotube fiber.

13 . A carbon nanotube composite comprising:
a carbon nanotube; and an aromatic monomer-derived conductive polymer coated along a surface of the carbon nanotube in a longitudinal direction, wherein a linear density of the carbon nanotube composite is equal to or greater than 20 g/km.

14 . The carbon nanotube composite of claim 13 , wherein the conductive polymer comprises one of or any combination of an aniline-based polymer, a pyrrole-based polymer, a thiophene polymer, and a poly(phenylene sulfide)-based polymer.

15 . The carbon nanotube composite of claim 13 , wherein specific electric conductance of the carbon nanotube composite is in a range from 700 to 1,000 Sm 2 /kg and a surface oxygen content of the carbon nanotube composite is in a range from 20 to 30 atomic %.

16 . The carbon nanotube composite of claim 13 , wherein an elongation is in a range from 10 to 20%, and an average pore diameter is in a range from 180 to 250 Å.

17 . An electrode for a supercapacitor comprising the carbon nanotube composite of claim 13 .

18 . A supercapacitor comprising an electrode, wherein the electrode comprises the carbon nanotube composite of claim 13 .

19 . The supercapacitor of claim 18 , wherein length capacitance (C L ) of the supercapacitor is equal to or greater than 80 mF/cm, specific capacitance (C SP ) of the supercapacitor is equal to or greater than 300 F/g, and a capacitance change after 90° bending of the supercapacitor is equal to or less than 5%.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Korea Inst Sci & Tech

Inventors

• Kim Gwan Sik
• Song Kyong Hwa
• Yun Deok Woo
• Jeong Hyeon Su
• Kim Seung Min
• Kim Nam Dong
• Lee Sung Ju

Classifications

• D10B2401/16

  antistatic; conductive · CPC title

• D10B2101/122

  Nanocarbons · CPC title

• D06M15/37

  Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• D01F1/10

  Other agents for modifying properties · CPC title

• D06M10/02

  Sonic or ultrasonic waves; Corona discharge · CPC title