Method for controllable synthesis of carbon based battery electrode material

Patent metadata

Field	Value
Publication number	US-10446848-B2
Application number	US-201715459791-A
Country	US
Kind code	B2
Filing date	Mar 15, 2017
Priority date	Mar 25, 2016
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

Carbon-based electrode materials including graphite particles bridged by hemispheres of fullerene, as well as methods of synthesizing the carbon-based electrode materials, are disclosed. These carbon-based electrode materials may allow for decreased irreversible capacity loss during cycling in lithium-ion battery systems.

First claim

What is claimed is:

1. A carbon-based electrode material comprising a plurality of graphite particles and a pentagon carbon ring material, the pentagon carbon ring material comprising a plurality of discrete fullerene hemispheres,
wherein the carbon-based electrode material comprises a plurality of pores capable of reacting interstitially with lithium ions, the pores being defined by the plurality of graphite particles bridged by the pentagon carbon ring material.

2. The carbon-based electrode material as set forth in claim 1 wherein at least a portion of the plurality of graphite particles have an average particle diameter of from about 1 μm to about 45 μm.

3. The carbon-based electrode material as set forth in claim 1 wherein at least a portion of the plurality of graphite particles have a specific surface area of from about 0.1 m 2 /g to about 30 m 2 /g.

4. The carbon-based electrode material as set forth in claim 1 wherein the pentagon carbon ring material further comprises fullerene, discrete, non-hemisphere fractions of fullerene, or combinations thereof.

5. The carbon-based electrode material as set forth in claim 1 , wherein the plurality of pores have an average diameter of from about 0.1 to 40 nm.

6. The carbon-based electrode material as set forth in claim 5 , wherein the plurality of pores have an average diameter of from about 1 to 10 nm.

7. A carbon-based electrode material comprising at least a first graphite particle connected to at least a second graphite particle, wherein the first and second graphite particles are connected by at least one discrete hemisphere of fullerene.

8. The carbon-based electrode material as set forth in claim 7 wherein at least one of the first or second graphite particles have an average particle diameter of from about 1 μm to about 45 μm.

9. The carbon-based electrode material as set forth in claim 7 wherein at least one of the first or second graphite particles have a specific surface area of from about 0.1 m 2 /g to about 30 m 2 /g.

10. The carbon-based electrode material as set forth in claim 7 wherein the at least one fullerene comprises at least one of C 60 fullerene, C 70 fullerene, C 74 fullerene, C 78 fullerene, C 80 fullerene, C 82 fullerene, C 84 fullerene, C 88 fullerene, C 88 fullerene, C 90 fullerene, C 92 fullerene, C 94 fullerene, C 98 fullerene, C 100-250 fullerene, C 250+ fullerene, a dimer thereof, and a trimer thereof.

11. The carbon-based electrode material as set forth in claim 7 wherein the at least one fullerene comprises a mixture of C 60 fullerene and C 70 fullerene.

12. The carbon-based electrode material as set forth in claim 7 , wherein the material comprises a plurality of pores capable of reacting interstitially with lithium ions.

13. The carbon-based electrode material as set forth in claim 12 , wherein the plurality of pores have an average diameter of from about 0.1 to 40 nm.

14. The carbon-based electrode material as set forth in claim 13 , wherein the plurality of pores have an average diameter of from about 1 to 10 nm.

15. A method of synthesizing a carbon-based material, the method comprising:
treating a mixture of graphite particles and discrete fullerene hemispheres to form a composite material comprising a plurality of pores defined by graphite particles bridged by the discrete hemispheres of fullerene.

16. The method as set forth in claim 15 , wherein the graphite particles and hemispheres of fullerene are mixed under inert gas flow.

17. The method as set forth in claim 16 , wherein the inert gas is argon.

18. The method as set forth in claim 15 , wherein the treating step comprises heating the mixture to a temperature of from about 1500° C. to about 2000° C.

19. The method as set forth in claim 18 , wherein the treating step further comprises heating the mixture in the presence of a hydrocarbon gas selected from the group consisting of methane and propane.

Assignees

• Honda Motor Co Ltd

Inventors

• Harutyunyan Avetik

Classifications

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/1393

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

• H01M4/362 Primary

  Composites · CPC title

• H01M4/663

  containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title