EP-4742327-A1 - CONDUCTIVE AUXILIARY AGENT, DISPERSION LIQUID, ELECTRODE, SECONDARY BATTERY, MULTI-WALLED CARBON NANOTUBE POWDER, PLANAR AGGREGATE, FILTER, ELECTROMAGNETIC SHIELD, AND PELLICLE FOR EXTREME ULTRAVIOLET RAYS

Abstract

To provide a conductive auxiliary agent, a dispersion liquid, an electrode, a secondary battery, as well as a multi-walled carbon nanotube powder, a planar assembly, a filter, an electromagnetic wave shielding and a pellicle for extreme ultraviolet rays, in which the enhancement effect of conductivity is excellent. A conductive auxiliary agent, a dispersion liquid, an electrode, a secondary battery, as well as a multi-walled carbon nanotube powder, a planar assembly, a filter, an electromagnetic wave shielding and a pellicle for extreme ultraviolet rays, each including a multi-walled carbon nanotube powder that is a ground product of a multi-walled carbon nanotube having a tensile strength of 10 MPa to 100 MPa and that has an angle of repose of 10 degrees to 90 degrees.

Inventors

• YASHIRO, ARIHIRO
• ARIMURA, TAKASHI
• KAMEI, Ko
• AKATSU, MITSUTOSHI

Assignees

• Sumitomo Chemical Company, Limited

Dates

Publication Date

20260513

Application Date

20240613

Claims (17)

1. A conductive auxiliary agent, comprising a multi-walled carbon nanotube powder that is a ground product of a multi-walled carbon nanotube having a tensile strength of 10 MPa to 100 MPa and that has an angle of repose of 10 degrees to 90 degrees.
2. The conductive auxiliary agent according to claim 1, wherein the multi-walled carbon nanotube has a maximum length of 10 µm to 30000 µm.
3. The conductive auxiliary agent according to claim 1 or claim 2, which is a conductive auxiliary agent for a negative electrode.
4. A dispersion liquid comprising the conductive auxiliary agent according to claim 1 or claim 2 and a dispersion medium.
5. An electrode comprising an electrode active material and the conductive auxiliary agent according to claim 1 or claim 2.
6. A secondary battery comprising the electrode according to claim 5.
7. A multi-walled carbon nanotube powder that is a ground product of a multi-walled carbon nanotube having a tensile strength of 10 MPa to 100 MPa and a maximum length of 1000 µm to 30000 µm and that has an angle of repose of 10 degrees to 90 degrees.
8. The multi-walled carbon nanotube powder according to claim 7, which is a conductive auxiliary agent for a negative electrode.
9. A dispersion liquid comprising the multi-walled carbon nanotube powder according to claim 7 or claim 8 and a dispersion medium.
10. A composition comprising the multi-walled carbon nanotube powder according to claim 7 or claim 8 and at least one selected from the group consisting of a resin, ceramics and concrete.
11. An electrode comprising an electrode active material and the multi-walled carbon nanotube powder according to claim 7 or claim 8.
12. A secondary battery comprising the electrode according to claim 11.
13. A dispersion liquid comprising a multi-walled carbon nanotube having a tensile strength of 10 MPa to 100 MPa and a maximum length of 1000 µm to 30000 µm, and a dispersion medium.
14. A planar assembly comprising the multi-walled carbon nanotube powder according to claim 7.
15. A filter comprising the planar assembly according to claim 14.
16. An electromagnetic wave shielding comprising the planar assembly according to claim 14.
17. A pellicle for extreme ultraviolet rays comprising the planar assembly according to claim 14.

Description

Technical Field The present disclosure relates to a conductive auxiliary agent, a dispersion liquid, an electrode, a secondary battery, a multi-walled carbon nanotube powder, a planar assembly, a filter, an electromagnetic wave shielding, and a pellicle for extreme ultraviolet rays. Background Art Carbon nanotubes (hereinafter, sometimes referred to as "CNTs") are favorable in mechanical properties and electric properties, and therefore are expected to be used in various applications. For example, Patent Literature 1 focuses on conductivity and adhesiveness of an electrode film included in a non-aqueous electrolyte secondary battery (in particular, lithium ion secondary battery), and proposes use of a carbon nanotube satisfying predetermined physical properties (namely, average outer diameter, BET specific surface area, fiber length, ratio of G/D, volume resistivity, and true density) in predetermined ranges. Secondary batteries such as lithium ion secondary batteries are utilized for power sources in various fields of mobile devices, electric vehicles, and the like. It is known that conductive auxiliary agents, for example, carbonaceous materials such as carbon black, Ketjen black, fullerene, graphene, and CNT, and metal materials are used for electrode materials included in secondary batteries. Citation List Patent Literature Patent Literature 1: Japanese Patent Laid-Open No. 2021-95314 Summary of Invention Problems to be Solved by Invention Carbonaceous materials such as carbon nanotubes have been conventionally known to be used as conductive auxiliary agents in order to enhance the conductivities in electrodes. However, electrodes with conventional conductive auxiliary agents have not sometimes achieved sufficient conductivities. An object to be achieved by one embodiment of the present disclosure is to provide a conductive auxiliary agent excellent in the enhancement effect of conductivity. An object to be achieved by another embodiment of the present disclosure is to provide a dispersion liquid, an electrode and a secondary battery, as well as a multi-walled carbon nanotube powder. An object to be achieved by still another embodiment of the present disclosure is to provide a planar assembly including a multi-walled carbon nanotube powder, as well as a filter, an electromagnetic wave shielding and a pellicle for extreme ultraviolet rays, each including the planar assembly. Means to Solve the Problems The present disclosure includes the following aspects. <1> A conductive auxiliary agent comprising a multi-walled carbon nanotube powder that is a ground product of a multi-walled carbon nanotube having a tensile strength of 10 MPa to 100 MPa and that has an angle of repose of 10 degrees to 90 degrees.<2> The conductive auxiliary agent according to <1>, wherein the multi-walled carbon nanotube has a maximum length of 10 µm to 30000 µm.<3> The conductive auxiliary agent according to <1> or <2>, which is a conductive auxiliary agent for a negative electrode.<4> A dispersion liquid comprising the conductive auxiliary agent according to any one of <1> to <3> and a dispersion medium.<5> An electrode comprising an electrode active material and the conductive auxiliary agent according to any one of <1> to <3>.<6> A secondary battery comprising the electrode according to <5>.<7> A multi-walled carbon nanotube powder that is a ground product of a multi-walled carbon nanotube having a tensile strength of 10 MPa to 100 MPa and a maximum length of 1000 µm to 30000 µm and that has an angle of repose of 10 degrees to 90 degrees.<8> The multi-walled carbon nanotube powder according to <7>, which is a conductive auxiliary agent for a negative electrode.<9> A dispersion liquid comprising the multi-walled carbon nanotube powder according to <7> or <8> and a dispersion medium.<10> A composition comprising the multi-walled carbon nanotube powder according to <7> or <8> and at least one selected from the group consisting of a resin, ceramics and concrete.<11> An electrode comprising an electrode active material and the multi-walled carbon nanotube powder according to <7> or <8>.<12> A secondary battery comprising the electrode according to <11>.<13> A dispersion liquid comprising a multi-walled carbon nanotube having a tensile strength of 10 MPa to 100 MPa and a maximum length of 1000 µm to 30000 µm, and a dispersion medium.<14> A planar assembly comprising the multi-walled carbon nanotube powder according to <7>.<15> A filter comprising the planar assembly according to <14>.<16> An electromagnetic wave shielding comprising the planar assembly according to <14>.<17> A pellicle for extreme ultraviolet rays comprising the planar assembly according to <14>. Effects of Invention According to one embodiment of the present disclosure, it is possible to provide a conductive auxiliary agent excellent in the enhancement effect of conductivity. According to another embodiment of the present disclosure, it is possible to provide a disper