Electrode for power storage device, power storage device, and method for manufacturing electrode for power storage device

Patent metadata

Field	Value
Publication number	US-9972446-B2
Application number	US-201414890185-A
Country	US
Kind code	B2
Filing date	May 13, 2014
Priority date	May 15, 2013
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

An electrode for a power storage device includes carbon nanotubes, graphene, an ionic liquid, and a three-dimensional network metal porous body which holds the carbon nanotubes, the graphene, and the ionic liquid in pore portions, wherein a ratio of a total amount of the carbon nanotubes and the graphene to an amount of the ionic liquid is more than or equal to 10% by mass and less than or equal to 90% by mass, and a mass ratio between the carbon nanotubes and the graphene is within a range of 3:7 to 7:3.

First claim

The invention claimed is:

1. An electrode for a power storage device, comprising:
carbon nanotubes;
graphene;
an ionic liquid; and
a three-dimensional network metal porous body which holds said carbon nanotubes, said graphene, and said ionic liquid in pore portions, wherein
a ratio of a total amount of said carbon nanotubes and said graphene to an amount of said ionic liquid is more than or equal to 10% by mass and less than or equal to 90% by mass,
a mass ratio between said carbon nanotubes and said graphene is within a range of 3:7 to 7:3,
the pore diameter of the three-dimensional network metal porous body is more than or equal to 450 μm and less than or equal to 850 μm,
the carbon nanotubes, the graphene, and the ionic liquid are placed into the three-dimensional network metal porous body as a kneaded material, and
the electrode for the power storage device does not contain a binder.

2. The electrode for a power storage device according to claim 1 , wherein said graphene has an average thickness in a range of more than or equal to 0.34 nm and less than or equal to 100 nm.

3. The electrode for a power storage device according to claim 1 , wherein said carbon nanotubes each have a shape in which both ends are opened.

4. The electrode for a power storage device according to claim 1 , wherein said carbon nanotubes have an average length in a range of more than or equal to 100 nm and less than or equal to 2000 μm.

5. The electrode for a power storage device according to claim 1 , wherein said carbon nanotubes have an average diameter in a range of more than or equal to 0.5 nm and less than or equal to 50 nm.

6. The electrode for a power storage device according to claim 1 , wherein said carbon nanotubes have a purity of more than or equal to 70% by mass.

7. A power storage device, comprising an electrode for a power storage device as recited in claim 1 .

8. The power storage device according to claim 7 , wherein said power storage device is an electric double layer capacitor.

9. A method for manufacturing an electrode for a power storage device as recited in claim 1 , comprising the steps of:
kneading carbon nanotubes and graphene into an ionic liquid to produce a kneaded material; and
charging said kneaded material into pore portions of a three-dimensional network metal porous body, wherein
the pore diameter of the three-dimensional network metal porous body is more than or equal to 450 μm and less than or equal to 850 μm,
the carbon nanotubes, the graphene, and the ionic liquid are placed into the three-dimensional network metal porous body as a kneaded material, and
the electrode for the power storage device does not contain a binder.

Assignees

• Sumitomo Electric Industries
• Meidensha Electric Mfg Co Ltd

Inventors

• Okuno Kazuki
• Majima Masatoshi
• Noguchi Takayuki
• Iida Daisuke
• Kuramoto Masamichi
• Ishikawa Masashi
• Hattori Maki
• Inui Takumi

Classifications

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01G11/06

  with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] · CPC title

• H01M4/1393

  of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01G11/38

  Carbon pastes or blends; Binders or additives therein · CPC title