Positive electrode for metal-air battery, metal-air battery including the same, and method of manufacturing carbon nanotube thin film

Patent metadata

Field	Value
Publication number	US-2019036186-A1
Application number	US-201816043368-A
Country	US
Kind code	A1
Filing date	Jul 24, 2018
Priority date	Jul 25, 2017
Publication date	Jan 31, 2019
Grant date	—

Abstract

A positive electrode for metal-air battery, comprising: a plurality of carbon nanotube films comprising a first carbon nanotube layer comprising a plurality of first carbon nanotubes; and a second carbon nanotube layer adjacent to the first carbon nanotube layer and comprising a plurality of second carbon nanotubes, wherein an alignment direction of the plurality of first carbon nanotubes in the first carbon nanotube layer and an alignment direction of the plurality of second carbon nanotubes in the second carbon nanotube layer are different from each other, and wherein an average specific tensile strength of the plurality of carbon nanotube films is greater than or equal to about 0.1 gigapascal per gram per cubic centimeter and less than or equal to about 1 gigapascal per gram per cubic centimeter.

First claim

What is claimed is:

1 . A positive electrode for metal-air battery, comprising:
a plurality of carbon nanotube films comprising
a first carbon nanotube layer comprising a plurality of first carbon nanotubes; and
a second carbon nanotube layer adjacent to the first carbon nanotube layer and comprising a plurality of second carbon nanotubes,
wherein an alignment direction of the plurality of first carbon nanotubes in the first carbon nanotube layer and an alignment direction of the plurality of second carbon nanotubes in the second carbon nanotube layer are different from each other, and wherein an average specific tensile strength of the plurality of carbon nanotube films is greater than or equal to about 0.1 gigapascal per gram per cubic centimeter and less than or equal to about 1 gigapascal per gram per cubic centimeter.

2 . The positive electrode for metal-air battery of claim 1 , wherein the first carbon nanotube layer and the second carbon nanotube layer are stacked on each other.

3 . The positive electrode for metal-air battery of claim 1 , further comprising:
an electrolyte film on a surface of each of the plurality of carbon nanotube films; and a space between each of the plurality of carbon nanotube films, wherein the space is configured such that the electrolyte film is pushed by a metal oxide generated during discharge of the metal-air battery in a direction away from each of the plurality of carbon nanotube films.

4 . The positive electrode for metal-air battery of claim 3 , wherein the space is defined by a surface of the electrolyte film.

5 . The positive electrode for metal-air battery of claim 1 , wherein an alignment angle of the plurality of first carbon nanotubes has a deviation of about 15° to about 45° in a clockwise or counterclockwise direction, and a Raman intensity ratio of a G band of the alignment direction of the plurality of first carbon nanotubes to a G band in a direction perpendicular to the alignment direction of the plurality of first carbon nanotubes, is greater than or equal to about 1.5 and less than or equal to about 4, and
an alignment angle of the plurality of second carbon nanotubes has a deviation of about 15° to about 45° in a clockwise or counterclockwise direction, and
a Raman intensity ratio of a G band of an alignment direction of the plurality of second carbon nanotubes to a G band of a direction perpendicular to the alignment direction of the plurality of second carbon nanotubes is greater than or equal to about 1.5 and less than or equal to about 4.

6 . The positive electrode for metal-air battery of claim 1 , wherein the first carbon nanotube layer and the second carbon nanotube layer each have a flat plate shape, and
wherein an angle between the alignment direction of the plurality of first carbon nanotubes in the first carbon nanotube layer and the alignment direction of the plurality of second carbon nanotubes in the second carbon nanotube layer is greater than or equal to 15° and less than or equal to 90°.

7 . The positive electrode for metal-air battery of claim 1 , wherein an aspect ratio of a carbon nanotube is greater than or equal to about 5×10 4 and less than or equal to about 1×10 7 .

8 . The positive electrode for metal-air battery of claim 1 , wherein an average length of the plurality of first carbon nanotubes, the plurality of second carbon nanotubes, or a combination thereof is greater than or equal to about 50 micrometers and less than or equal to 1 centimeter.

9 . The positive electrode for metal-air battery of claim 1 , wherein an average diameter of the plurality of first carbon nanotubes, the plurality of second carbon nanotubes, or a combination thereof is greater than or equal to about 1 nanometer and less than or equal to about 50 nanometers.

10 . The positive electrode for metal-air battery of claim 1 , wherein a total amount of a carbon nanotube in a carbon nanotube film is greater than or equal to 25 micrograms per square centimeter and less than or equal to 5 milligrams per square centimeter.

11 . The positive electrode for metal-air battery of claim 1 , wherein an average conductivity of the plurality of carbon nanotube thin film is greater than or equal to about 5×10 2 Siemens per centimeter per grams per cubic centimeter.

12 . The positive electrode for metal-air battery of claim 1 , wherein a carbon nanotube comprises a single walled carbon nanotube, a double-walled carbon nanotube, a multi-walled carbon nanotube, or a combination thereof.

13 . A metal-air battery comprising:
a negative electrode layer; a positive electrode layer; and a gas diffusion layer configured to supply oxygen to the positive electrode layer, wherein the positive electrode layer comprises: a plurality of carbon nanotube thin films comprising
a first carbon nanotube layer comprising a plurality of first carbon nanotubes; and a second carbon nanotube layer adjacent to the first carbon nanotube layer and comprising a plurality of second carbon nanotubes,
wherein an alignment direction of the plurality of first carbon nanotubes in the first carbon nanotube layer and an alignment direction of the plurality of second carbon nanotubes in the second carbon nanotube layer are different from each other, and wherein an average specific modulus of the plurality of carbon nanotube films is greater than or equal to about 0.1 gigapascal per gram per cubic centimeter and less than or equal to about 1 gigapascal per gram per cubic centimeter.

14 . The metal-air battery of claim 13 , further comprising:
an electrolyte film disposed on a surface of each of the plurality of carbon nanotube films; and a space between each of the plurality of carbon nanotube films, wherein the space is configured such that the electrolyte film is pushed by a metal oxide generated during discharge of the metal-air battery in a direction away from each of the plurality of first carbon nanotubes and the plurality of second carbon nanotubes.

15 . The metal-air battery of claim 13 , wherein an alignment angle of the plurality of first carbon nanotubes has a deviation of about 15° to 45° in a clockwise or counterclockwise direction, and a Raman intensity ratio of a G band in the alignment direction of the plurality of first carbon nanotubes to a G band in a direction perpendicular to the alignment direction of the plurality of first carbon nanotubes, is greater than or equal to about 1.5 and less than or equal to about 4, and
an alignment angle of the plurality of second carbon nanotubes has a deviation of about 15° to 45° in a clockwise or counterclockwise direction, and a Raman intensity ratio of a G band in the alignment direction of the plurality of second carbon nanotubes to a G band in a direction perpendicular to the alignment direction of the plurality of second carbon nanotubes is greater than or equal to about 1.5 and less than or equal to about 4.

16 . The metal-air battery of claim 13 , wherein the first carbon nanotube layer and the second carbon nanotube layer have a flat plate shape, and
the plurality of first carbon nanotubes in the first carbon nanotube layer and the plurality of second carbon nanotubes in the second carbon nanotube layer are disposed at an angle of greater than or equal to about 15° and less than or equal to about 90°.

17 . The metal-air battery of claim 13 , wherein an aspect ratio of a carbon nanotube is greater than or equal to about 5×10 4 and less than or equal to about 1×10 7 .

18 . The metal-air battery of claim 13 , wherein an average length

Assignees

• Samsung Electronics Co Ltd
• Seoul Nat Univ R&Db Foundation

Inventors

• Kim Hyunjin
• Park Chongrae
• Lee Dongjoon
• Im Dongmin
• Jung Yeonsu
• Cho Youngshik
• Byeon Minhoo

Classifications

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• C01B32/16

  Preparation · CPC title

• H01M12/06 Primary

  with one metallic and one gaseous electrode · CPC title

• H01M2/1606

  Electricity · mapped topic

• H01M4/96 Primary

  Carbon-based electrodes · CPC title