Sheet-shaped member

Patent metadata

Field	Value
Publication number	US-11955638-B2
Application number	US-202218091176-A
Country	US
Kind code	B2
Filing date	Dec 29, 2022
Priority date	Apr 4, 2007
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

A sheet-shaped member is provided and includes a porous carbon material including a material obtained from carbonization of a raw material including rice husk, the raw material having a silicon content of at least 5 wt %, the raw material is heat treated before carbonization, and the raw material is treated by an alkali treatment after carbonization to reduce the silicon content, the porous carbon material having a specific surface area of at least 10 m2/g as measured by the nitrogen BET method, a pore volume of at least 0.1 cm3/g as measured by the BJH method and MP method, and an R value of 1.5 or greater, wherein the porous carbon material includes mesopores having pore sizes from 2 nm to 50 nm and obtained from the alkali treatment of the raw material after carbonization, the porous carbon material further includes macropores and micropores, the R value is expressed as R=B/A, the A referring to an intensity at an intersection between the baseline of a diffraction peak of the (002) plane as obtained based on powdery X-ray diffractometry of the porous carbon material and a perpendicular line downwardly drawn from the diffraction peak of the (002) plane, and the B referring to the intensity of the diffraction peak of the (002) plane.

First claim

The invention claimed is:

1. A sheet-shaped member comprising:
a porous carbon material including a material obtained from carbonization of a raw material including rice husk, the raw material having a silicon content of at least 5 wt %, the raw material is heat treated before carbonization, and the raw material is treated by an alkali treatment after carbonization to reduce the silicon content, the porous carbon material having a specific surface area of at least 10 m 2 /g as measured by the nitrogen BET method, a pore volume of at least 0.1 cm 3 /g as measured by the BJH method and MP method, and an R value of 1.5 or greater,
wherein the porous carbon material includes mesopores having pore sizes from 2 nm to 50 nm and obtained from the alkali treatment of the raw material after carbonization, the porous carbon material further includes macropores and micropores,
the R value is expressed as R=B/A, the A referring to an intensity at an intersection between the baseline of a diffraction peak of the (002) plane as obtained based on powdery X-ray diffractometry of the porous carbon material and a perpendicular line downwardly drawn from the diffraction peak of the (002) plane, and the B referring to the intensity of the diffraction peak of the (002) plane.

2. The sheet-shaped member of claim 1 further comprising a support member supporting the sheet-shaped member thereon.

3. The sheet-shaped member of claim 2 , wherein the support member comprises nonwoven fabrics holding the sheet-shaped member therebetween.

4. The sheet-shaped member of claim 1 comprising magnesium in an amount of at least 0.01 wt % and at most 3 wt %, potassium in an amount of at least 0.01 wt % and at most 3 wt %, and calcium in an amount of at least 0.05 wt % and at most 3 wt %.

5. The sheet-shaped member of claim 1 , wherein the porous carbon material has a specific surface area of at least 50 m 2 /g as measured by the nitrogen BET method.

6. The sheet-shaped member of claim 1 , wherein the porous carbon material has a specific surface area of at least 100 m 2 /g as measured by the nitrogen BET method.

7. The sheet-shaped member of claim 1 , wherein the porous carbon material has a specific surface area of at least 400 m 2 /g as measured by the nitrogen BET method.

8. The sheet-shaped member of claim 1 , wherein the specific surface area of the porous carbon material is up to 1500 m 2 /g as measured by the nitrogen BET method.

Assignees

• Sony Corp

Inventors

• Tabata Seiichiro
• Yamada Shinichiro
• Kanno Masayoshi
• Noguchi Tsutomu
• Horie Takeshi

Classifications

• H01M4/587 Primary

  for inserting or intercalating light metals · CPC title

• B01J20/20

  comprising free carbon; comprising carbon obtained by carbonising processes · CPC title

• B01J20/28033

  Membrane, sheet, cloth, pad, lamellar or mat · CPC title

• B01J20/28059

  being less than 100 m2/g · CPC title

• B01J20/28061

  being in the range 100-500 m2/g · CPC title