Carbonaceous material, method for producing same, and electrochemical device

Patent metadata

Field	Value
Publication number	US-12266802-B2
Application number	US-202117918356-A
Country	US
Kind code	B2
Filing date	Apr 19, 2021
Priority date	Apr 20, 2020
Publication date	Apr 1, 2025
Grant date	Apr 1, 2025

Abstract

The present invention relates to a carbonaceous material having a pore volume determined by performing Grand Canonical Monte Carlo simulation on an adsorption-desorption isotherm of carbon dioxide of 0.05 cm 3 /g or more and 0.20 cm 3 /g or less, and a ratio of desorption amount to adsorption amount (desorption amount/adsorption amount) at a relative pressure of 0.01 in the adsorption-desorption isotherm of 1.05 or more.

First claim

The invention claimed is:

1. A carbonaceous material, which has
a pore volume determined by performing Grand Canonical Monte Carlo simulation on an adsorption-desorption isotherm of carbon dioxide at 273 K of 0.05 cm 3 /g or more and 0.20 cm 3 /g or less, and
a ratio of desorption amount to adsorption amount at a relative pressure of 0.01 in the adsorption-desorption isotherm of 1.05 or more.

2. The carbonaceous material according to claim 1 , having an oxygen element content of 0.5% by mass or more.

3. The carbonaceous material according to claim 1 , having a BET specific surface area measured in accordance with a nitrogen adsorption method of 1 m 2 /g or more and 20 m 2 /g or less.

4. The carbonaceous material according to claim 1 , having a mesopore volume measured in accordance with a BJH method of 3.7 mm 3 /g or more and 41 mm 3 /g or less.

5. The carbonaceous material according to claim 4 , having an average particle size (D50) of 1.3 μm or more and 9.5 μm or less.

6. The carbonaceous material according to claim 4 , having a BET specific surface area measured in accordance with a nitrogen adsorption method of 3 m 2 /g or more and 60 m 2 /g or less.

7. The carbonaceous material according to claim 1 , having an average interplanar spacing d 002 of the (002) plane calculated in accordance with a Bragg equation by means of a wide-angle X-ray diffraction method of 0.36 nm or more and 0.42 nm or less.

8. The carbonaceous material according to claim 1 , for an electrochemical device.

9. The carbonaceous material according to claim 8 , which is used with a pre-doping of a metal ion.

10. An electrochemical device, comprising the carbonaceous material according to claim 1 .

11. A method of producing the carbonaceous material according to claim 1 , the method comprising
heating a carbon precursor having a BET specific surface area measured in accordance with a nitrogen adsorption method of 500 m 2 /g or less to 900° C. at a heating rate of 60° C./minute or less in a temperature range of from 600° C. to 900° C., thereby obtaining a heat treated carbon precursor.

12. The method according to claim 11 , wherein the heating is performed in the presence of a volatile organic substance.

13. The method according to claim 11 , further comprising
subsequently performing a second heat treatment at 900° C. or higher and 1180° C. or lower.

14. The method according to claim 11 , further comprising
pulverizing the carbon precursor and/or the heat treated carbon precursor.

15. The method according to claim 13 , further comprising
subsequently performing a second heat treatment at 900° C. or higher and 1180° C. or lower.

16. A method of producing the carbonaceous material according to claim 1 , the method comprising
performing a heat treatment of a carbon precursor having a BET specific surface area measured in accordance with a nitrogen adsorption method of 500 m 2 /g or less at a temperature of 600° C. or higher and lower than 900° C. for more than 5 minutes in the presence of a volatile substance derived from a volatile organic substance, thereby obtaining a heat treated carbon precursor.

17. The method according to claim 16 , further comprising
pulverizing the carbon precursor and/or the heat treated carbon precursor.

Assignees

• Kuraray Co

Inventors

• Arima Junichi
• Yamabata Akinori
• Okuno Taketoshi
• Tago Shinya

Classifications

• C01P2006/40

  Electric properties · CPC title

• C01P2006/14

  Pore volume · CPC title

• C01P2006/12

  Surface area · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01P2002/77

  by unit-cell parameters, atom positions or structure diagrams · CPC title