Electrode material, electrode and electrical storage device

Patent metadata

Field	Value
Publication number	US-10081547-B2
Application number	US-201514828961-A
Country	US
Kind code	B2
Filing date	Aug 18, 2015
Priority date	Sep 1, 2014
Publication date	Sep 25, 2018
Grant date	Sep 25, 2018

Abstract

The present invention relates to an electrode material, an electrode, an electrical storage device and a lithium-ion capacitor, and the electrode material includes a carbon material and reduces its weight at a temperature not more than 650° C. by 20% relative to the weight thereof before heating when thermogravimetric analysis is performed on the electrode material with a heating rate of 5° C./min in an air flow at a rate of 100 ml/min.

First claim

What is claimed is:

1. An electrode material comprising a carbon material,
wherein a temperature at which the electrode material reduces a weight thereof by 20% relative to the weight thereof before heating is not more than 650° C. when thermogravimetric analysis is performed on the electrode material with a heating rate of 5° C./min in an air flow at a rate of 100 ml/min,
wherein the carbon material is a composite carbon material which comprises a core-forming carbon material and a coating carbon material, and the composite carbon material is a calcined product of a mixture which comprises carbon material particles and a nitrogen-containing organic polymer,
wherein a content of nitrogen element in the nitrogen-containing organic polymer is from 0.25 to 2% by mass, and
wherein a specific surface area of the electrode material is from 1 to 50 m 2 /g.

2. The electrode material according to claim 1 , wherein the temperature at which the electrode material reduces the weight thereof by 20% is a temperature not less than 500° C.

3. The electrode material according to claim 1 , wherein the electrode material comprises basic functional groups, and a content of the basic functional groups is in the range of 0.015-0.20 mmol/g.

4. The electrode material according to claim 1 , wherein a volume of macropores having pore diameters of 50-400 nm in the electrode material is 0.02-0.20 cc/g.

5. The electrode material according to claim 1 , wherein a volume of mesopores having pore diameters of 2-50 nm in the electrode material is 0.001-0.05 cc/g.

6. The electrode material according to claim 1 , wherein a temperature at which the weight reduction ceases is not more than 700° C. when thermogravimetric analysis is performed on the electrode material in a range from 30 to 1000° C. with a heating rate of 5° C./min in an air flow at a rate of 100 ml/min.

7. The electrode material according to claim 6 , wherein the temperature at which the weight reduction ceases is not less than 650° C.

8. An electrode comprising the electrode material according to claim 1 .

9. An electrical storage device comprising a negative electrode which comprises the electrode according to claim 8 .

10. A lithium-ion capacitor comprising the electrode material according to claim 1 .

11. The electrode material according to claim 1 , wherein a temperature at which the carbon material particles reduce a weight thereof by 20% relative to the weight thereof before heating is more than 650° C. when thermogravimetric analysis is performed on the carbon material particles with a heating rate of 5° C./min in an air flow at a rate of 100 ml/min.

12. The electrode material according to claim 1 , wherein a temperature of the calcination of the mixture is in a range from 700 to 2000° C.

13. The electrode material according to claim 1 , wherein the core-forming carbon material is a graphite crystalline carbon material having a (002) interplanar spacing in a range of from 0.335 to 0.338 nm.

14. The electrode material according to claim 1 , wherein the mixture further comprises carbon black or carbon fibers.

15. The electrode material according to claim 1 , wherein a temperature at which the electrode material reduces the weight thereof by 20% relative to the weight thereof before heating is not more than 630° C.

16. The electrode material according to claim 1 , wherein the temperature at which the electrode material reduces the weight thereof by 20% is a temperature not less than 550° C.

17. The electrode material according to claim 1 , wherein the specific surface area of the electrode material is from 5 to 30 m 2 /g.

18. An electrode material comprising a carbon material,
wherein a temperature at which the electrode material reduces a weight thereof by 20% relative to the weight thereof before heating is not more than 650° C. when thermogravimetric analysis is performed on the electrode material with a heating rate of 5° C./min in an air flow at a rate of 100 ml/min,
wherein the carbon material is a composite carbon material which comprises a core-forming carbon material and a coating carbon material, and the composite carbon material is a calcined product of a mixture which comprises carbon material particles and a nitrogen-containing organic polymer,
wherein an amount of the nitrogen-containing organic polymer in the mixture is from 30 to 500 parts by mass with respect to 100 parts by mass of the core-forming carbon material, and
wherein a specific surface area of the electrode material is from 1 to 50 m 2 /g.

19. The electrode material according to claim 18 , wherein the amount of the nitrogen-containing organic polymer in the mixture is from 60 to 400 parts by mass with respect to 100 parts by mass of the core-forming carbon material.

20. The electrode material according to claim 18 , wherein the electrode material comprises basic functional groups, and a content of the basic functional groups is in the range of 0.015-0.20 mmol/g.

21. The electrode material according to claim 18 , wherein a volume of macropores having pore diameters of 50-400 nm in the electrode material is 0.02-0.20 cc/g.

22. The electrode material according to claim 18 , wherein a volume of mesopores having pore diameters of 2-50 nm in the electrode material is 0.001-0.05 cc/g.

23. The electrode material according to claim 18 , wherein a temperature at which the weight reduction ceases is not more than 700° C. when thermogravimetric analysis is performed on the electrode material in a range from 30 to 1000° C. with a heating rate of 5° C./min in an air flow at a rate of 100 ml/min.

24. An electrode comprising the electrode material according to claim 18 .

25. An electrical storage device comprising a negative electrode which comprises the electrode according to claim 24 .

26. The electrode material according to claim 18 , wherein a content of nitrogen element in the nitrogen-containing organic polymer is from 0.25 to 2% by mass.

27. The electrode material according to claim 18 , wherein the specific surface area of the electrode material is from 5 to 30 m 2 /g.

Assignees

• Jsr Corp
• Jm Energy Corp

Inventors

• Chung Kang Ko
• Tanaka Ryo
• Shimizu Takahiro
• Senoo Kouji
• Shimobaba Satoshi
• Hosaka Yukio
• Sakurai Fujio
• Yamamoto Masahiro
• Kojima Kenji

Classifications

• C01P2006/14

  Pore volume · CPC title

• H01G11/86

  specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) · CPC title

• H01G11/04

  Hybrid capacitors · CPC title

• H01G11/38

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

• H01M4/133

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