Potato-shaped graphite particles with low impurity rate at the surface, method for preparing the same

Patent metadata

Field	Value
Publication number	US-9444092-B2
Application number	US-57251009-A
Country	US
Kind code	B2
Filing date	Oct 2, 2009
Priority date	Oct 25, 2000
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

Modified graphite particles obtained from graphite or based on graphite, the said particles having impurities in their internal structure and having on the surface a low, even nil, rate of an impurity or several impurities. In addition, these particles have at least one of the following characteristics:
a tab density between 0.3 and 1.5 g/cc; a potatolike shape; and a granulometric dispersion such that the D90/D10 ratio varies between 2 and 5 and the particles have a size between 1 and 50 μm.

These particles can be used for fuel cells, electrochemical generators, or as moisture absorbers and/or oxygen absorbers and they have important electrochemical properties. The electrochemical cells and batteries thus obtained are stable and safe.

First claim

The invention claimed is:

1. Modified graphite-based particles comprising particles of graphite with a prismatic shape covered with a metallic deposit or with a metallic and carbonic deposit, said modified graphite-based particles having a potatolike shape and at least one characteristic selected from the group consisting of:
a tap density between 0.3 and 1.5 g/cc;
a granulometric dispersion such that the D90/D10 ratio varies between 2 and 5; and
the modified graphite-based particles have a size between 1 and 50 μm.

2. The modified graphite-based particles of claim 1 , wherein the average thickness of the metallic or the metallic and carbonic deposit covering the prismatic particles of graphite is between 50 nm and 2 μm.

3. The modified graphite-based particles of claim 1 , wherein the tap density is between 0.5 and 1.4 g/cc.

4. The modified graphite-based particles of claim 3 , wherein the tap density is between 1 and 1.3 g/cc.

5. The modified graphite-based particles of claim 1 , wherein the modified graphite-based particles have a granulometric dispersion such that the D90/D10 ratio varies between 2.2 and 4.2 and the particles have a size between 2 and 30 μm.

6. The modified graphite-based particles of claim 5 , wherein the modified graphite-based particles have a sphericity of 80% or more.

7. The modified graphite-based particles of claim 3 , wherein the modified graphite-based particles have a granulometric dispersion such that the D90/D10 ratio varies between 2.2 and 4.2 and the particles have a size between 2 and 30 μm.

8. The modified graphite-based particles of claim 4 , wherein the modified graphite-based particles have a granulometric dispersion such that the D90/D10 ratio varies between 2.2 and 4.2 and the particles have a size between 2 and 30 μm.

9. The modified graphite-based particles of claim 1 , wherein the structural parameters of said modified graphite-based particles correspond to the equations fe 1 =[Y+I]/[(Y+1)+(B/2T) (Y−1)] and fe e =[Y+I]/[(Y+1)+(B/T) (Y−1)], wherein Y represents a real number greater than or equal to 1, B represents the length of the modified graphite-based particle, and T represents the thickness of the modified graphite-based particle.

10. Modified graphite-based particles comprising particles of graphite covered with a metallic deposit or with a metallic and carbonic deposit,
the modified graphite-based particles being prepared by coating particles of graphite in a manner to obtain a modified graphite-based particle with an effective edge function that is greater than an edge function of the graphite particle, and an effective basal function that is smaller than a basal function of the graphite particle,
wherein the particles of graphite have a prismatic shape.

11. The modified graphite-based particles of claim 10 , wherein the average thickness of the metallic or the metallic and carbonic deposit covering the prismatic particles of graphite is between 50 nm and 2 μm.

12. The modified graphite-based particles of claim 10 , wherein said modified graphite-based particles have a tap density between 0.3 and 1.5 g/cc.

13. The modified graphite-based particles of claim 10 , wherein said modified graphite-based particles have a tap density between 1 and 1.3 g/cc.

14. The modified graphite-based particles of claim 10 , wherein the modified graphite-based particles have a granulometric dispersion such that the D90/D10 ratio varies between 2 and 5 and the particles have a size between 1 and 50 μm.

15. The modified graphite-based particles of claim 10 , wherein the modified graphite-based particles have a granulometric dispersion such that the D90/D10 ratio varies between 2.2 and 4.2 and the particles have a size between 2 and 30 μm.

16. The modified graphite-based particles of claim 10 , wherein the modified graphite-based particles have a sphericity of 80% or more.

17. The modified graphite-based particles of claim 10 ,
wherein the average thickness of the metallic or the metallic and carbonic deposit covering the prismatic particles of graphite is between 50 nm and 2 μm,
wherein said modified graphite-based particles have a tap density between 1 and 1.3 g/cc, and
wherein the modified graphite-based particles have a granulometric dispersion such that the D90/D10 ratio varies between 2.2 and 4.2 and the particles have a size between 2 and 30 μm.

18. Modified graphite-based particles comprising particles of graphite covered with a metallic deposit or with a metallic and carbonic deposit,
the particles of graphite within the deposit having a sphericity of less than 80%, and
the modified graphite-based particles having a sphericity of 80% or more.

19. The modified graphite-based particles of claim 18 , wherein the particles of graphite have a prismatic shape.

20. The modified graphite-based particles of claim 18 , wherein the average thickness of the metallic or the metallic and carbonic deposit covering the prismatic particles of graphite is between 50 nm and 2 μm.

21. The modified graphite-based particles of claim 18 , wherein said modified graphite-based particles have a tap density between 0.3 and 1.5 g/cc.

22. The modified graphite-based particles of claim 18 , wherein said modified graphite-based particles have a tap density between 1 and 1.3 g/cc.

23. The modified graphite-based particles of claim 18 , wherein the modified graphite-based particles have a granulometric dispersion such that the D90/D10 ratio varies between 2 and 5 and the particles have a size between 1 and 50 μm.

24. The modified graphite-based particles of claim 18 , wherein the modified graphite-based particles have a granulometric dispersion such that the D90/D10 ratio varies between 2.2 and 4.2 and the particles have a size between 2 and 30 μm.

25. The modified graphite-based particles of claim 18 ,
wherein the average thickness of the metallic or the metallic and carbonic deposit covering the prismatic particles of graphite is between 50 nm and 2 μm,
wherein said modified graphite-based particles have a tap density between 1 and 1.3 g/cc, and
wherein the modified graphite-based particles have a granulometric dispersion such that the D90/D10 ratio varies between 2.2 and 4.2 and the particles have a size between 2 and 30 μm.

26. Modified graphite-based particles comprising particles of graphite with a prismatic shape covered with a metallic deposit or with a metallic and carbonic deposit, said modified graphite-based particles having a sphericity of 80% or more and at least one characteristic selected from the group consisting of:
a tap density between 0.3 and 1.5 g/cc;
a granulometric dispersion such that the D90/D10 ratio varies between 2 and 5; and
the modified graphite-based particles have a size between 1 and 50 μm.

27. The modified graphite-based particles of claim 26 , wherein the average thickness of the metallic or the metallic and carbonic deposit covering the prismatic particles of graphite is between 50 nm and 2 μm.

28. The modified graphite-based particles of claim 26 , wherein said modified graphite-based particles have a tap density between 0.3 and 1.5 g/cc.

29. The modified graphite-based particles of claim 26 , wherein said modified graphite-based particles have a tap density between 1 and 1.3 g/cc.

30. The modified graphite-based particles of claim 26 , wherein the modified gra

Assignees

• Guerfi Abdelbast
• Brochu Fernand
• Kinoshita Kimio
• Zaghib Karim
• Hydro Quebec

Inventors

• Guerfi Abdelbast
• Brochu Fernand
• Kinoshita Kimio
• Zaghib Karim

Classifications

• H01M4/0402

  Methods of deposition of the material · CPC title

• H01M4/583

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

• B01J20/3293

  Coatings on a core, the core being particle or fiber shaped, e.g. encapsulated particles, coated fibers · CPC title

• H01M10/0525

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

• H01M4/133 Primary

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