Elemental metal and carbon mixtures for energy storage devices

Patent metadata

Field	Value
Publication number	US-11901549-B2
Application number	US-202217819558-A
Country	US
Kind code	B2
Filing date	Aug 12, 2022
Priority date	Feb 23, 2016
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

An energy storage device can include a first electrode, a second electrode and a separator between the first electrode and the second electrode wherein the first electrode or the second electrode includes elemental lithium metal and carbon particles. A method for fabricating an energy storage device can include forming a first electrode and a second electrode, and inserting a separator between the first electrode and the second electrode, where forming the first electrode or the second electrode can include combining elemental lithium metal and a plurality of carbon particles.

First claim

What is claimed is:

1. An electrode film, comprising:
carbon particles, an elemental metal and a fibrillizable binder;
wherein at least some of the elemental metal is coated on at least a portion of at least some of the carbon particles; and
wherein the electrode film is substantially free of solvent residue.

2. The electrode film of claim 1 , wherein the elemental metal comprises resolidified elemental metal.

3. The electrode film of claim 1 , wherein the elemental metal comprises elemental metal particles.

4. The electrode film of claim 3 , wherein the elemental metal particles comprise elemental lithium metal particles.

5. The electrode film of claim 3 , wherein the elemental metal particles comprise a particle size distribution D50 value of about 0.5 μm to about 10 μm.

6. The electrode film of claim 1 , wherein the elemental metal comprises about 1 wt % to about 5 wt % of the electrode film.

7. The electrode film of claim 1 , wherein the carbon particles are graphite particles.

8. The electrode film of claim 7 , wherein the elemental metal is resolidified lithium metal.

9. The electrode film of claim 1 , wherein the carbon particles comprise a particle size distribution D50 value of about 1 μm to about 20 μm.

10. The electrode film of claim 1 , wherein the carbon particles comprise porous carbon particles, each porous carbon particle having a plurality of pores, wherein at least some of the plurality of pores receive at least some elemental metal.

11. The electrode film of claim 10 , wherein the plurality of pores occupy about 10% to about 80% of the volume of the porous carbon particle.

12. The electrode film of claim 10 , wherein the porous carbon particles comprise activated carbon.

13. The electrode film of claim 10 , wherein the porous carbon particles comprise hierarchically structured carbon.

14. The electrode film of claim 10 , wherein the porous carbon particles comprise mesoporous carbon.

15. The electrode film of claim 10 , further comprising a solid electrolyte interface (SEI) layer covering exposed portions of the elemental metal.

16. The electrode film of claim 15 , wherein the SEI layer covers exposed portions of the elemental metal that are below an exterior surface of the corresponding porous carbon particle.

17. The electrode film of claim 1 , wherein the fibrillizable binder comprises at least one of polytetrafluoroethylene (PTFE), perfluoropolyolefin, polypropylene, a polyethylene, and co-polymers thereof.

18. The electrode film of claim 1 , wherein the electrode film is a dry electrode film.

19. The electrode film of claim 1 , wherein the electrode film is free-standing.

20. An energy storage device, comprising:
a first electrode;
a second electrode; and
a separator between the first electrode and the second electrode,
wherein at least one of the first electrode and the second electrode comprises the electrode film of claim 1 .

21. The device of claim 20 , wherein at least one of the first electrode and the second electrode comprises an anode.

22. The device of claim 20 , wherein the energy storage device is a lithium ion battery.

23. A method for fabricating an electrode film, comprising:
combining an elemental metal, a plurality of carbon particles and a fibrillizable binder to form an electrode film mixture, wherein at least some of the elemental metal is coated on at least a portion of at least some of the plurality of carbon particles; and
forming an electrode film from the electrode film mixture, wherein the electrode film is substantially free of solvent residue.

24. The method of claim 23 , wherein combining the elemental metal and the plurality of carbon particles comprises mixing the elemental metal and the plurality of carbon particles such that the mixing melts at least a portion of the elemental metal to form a molten elemental metal.

25. The method of claim 24 , wherein the mixing coats at least a portion of at least some of the plurality of carbon particles with the molten elemental metal.

26. The method of claim 23 , wherein the elemental metal comprises elemental metal particles.

27. The method of claim 26 , wherein the elemental metal particles comprise a particle size distribution D50 value of about 0.5 μm to about 10 μm.

28. The method of claim 23 , wherein the elemental metal comprises about 1 wt % to about 5 wt % of the electrode film.

29. The method of claim 23 , wherein the plurality of carbon particles are graphite particles.

30. The method of claim 29 , wherein the elemental metal is molten lithium metal.

31. The method of claim 23 , wherein the plurality of carbon particles comprise a particle size distribution D50 value of about 1 μm to about 20 μm.

32. The method of claim 23 , wherein the plurality of carbon particles comprise a plurality of porous carbon particles, each porous carbon particle comprising a plurality of pores.

33. The method of claim 32 , wherein the plurality of porous carbon particles comprise at least one of activated carbon and hierarchically structured carbon.

34. The method of claim 32 , wherein combining the elemental metal and the plurality of carbon particles comprises mixing the elemental metal and the plurality of porous carbon particles such that at least some of the plurality of pores receive at least some elemental metal.

35. The method of claim 34 , further comprising forming a solid electrolyte interface (SEI) layer over exposed portions of the elemental metal.

36. The method of claim 35 , wherein forming the SEI layer comprises covering exposed portions of the elemental metal that is below an exterior surface of the corresponding porous carbon particle.

37. The method of claim 35 , wherein forming the SEI layer comprises exposing the exposed portions of the elemental metal to an electrolyte solvent vapor.

38. The method of claim 37 , wherein exposing the exposed portions of the elemental metal to an electrolyte solvent vapor comprises exposing the exposed portions of the elemental metal to a carbonate vapor.

39. The method of claim 23 , wherein forming the electrode film comprises fibrillizing the electrode film mixture.

40. The method of claim 23 , further comprising:
forming a first electrode and a second electrode, wherein at least one of the first electrode and the second electrode comprises the electrode film and a current collector; and
inserting a separator between the first electrode and the second electrode.

Assignees

• Tesla Inc

Inventors

• Duong Hieu Minh
• Mitchell Porter
• SAIDI Mohammed-Yazid

Classifications

• H01M4/364 Primary

  as mixtures · CPC title

• H01G11/42

  Powders or particles, e.g. composition thereof · CPC title

• H01G11/50

  specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation · CPC title

• H01G11/52

  Separators · CPC title

• H01G11/86

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