Granted Patent
B2
US 12,300,818 · App. 17/961,705 · Granted May 13, 2025
Sulfurized carbon cathodes
Inventors:
James M. Tour (Houston, TX); Rodrigo Villegas Salvatierra (Houston, TX); Gladys Anahi Lopez Silva (Houston, TX); Abdul-Ramahn O. Raji (Houston, TX)
Assignee:
William Marsh Rice University
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Abstract
Alkali metal-sulfur cells and batteries with cathode layers that store alkali metal charge carriers (e.g., lithium ions) in agglomerates of sulfurized carbon. The cathode layers lack costly and environmentally unfriendly nickel and cobalt. The cathode layers are composites that include agglomerates of sulfurized-carbon particles in a conductive binder and interconnected by sp 2 -bonded carbon materials, such as carbon nanotubes or nanoribbons, that extend within the agglomerates and between the sulfurized-carbon particles.
Claims (23)
1. A cathode for an energy-storage device, wherein the cathode comprises:
(a) distinct agglomerates of sulfurized-carbon particles, wherein
(i) the sulfurized-carbon particles comprise first carbon atoms with adjacent sulfur atoms, and
(ii) a majority of the carbon atoms with the adjacent sulfur atoms are bonded to the adjacent sulfur atoms via carbon-sulfur bonds; and
(b) carbon nanomaterial with second carbon atoms and extending within the agglomerates of sulfurized-carbon particles and between the sulfurized-carbon particles.
2. The cathode of claim 1 , wherein the carbon nanomaterial is covalently bonded to the sulfurized-carbon particles.
3. The cathode of claim 1 , wherein at least 90% of the first and second carbon atoms with the adjacent sulfur atoms are bonded to the adjacent sulfur atoms via carbon-sulfur bonds.
4. The cathode of claim 1 further comprising a binder within which the agglomerates are distributed.
5. The cathode of claim 1 , wherein the particles comprise less than 10% oxygen in mass ratio.
6. The cathode of claim 1 , wherein the agglomerates of sulfurized-carbon particles are ellipsoid.
7. The cathode of claim 6 , wherein the agglomerates of sulfurized-carbon particles have average principal axes of between 500 nanometers and 5,000 nanometers.
8. The cathode of claim 7 , wherein the sulfurized-carbon particles are ellipsoid.
9. The cathode of claim 8 , wherein the sulfurized-carbon particles have average principal axes of less than one micron.
10. The cathode of claim 9 , wherein the average of the principal axes of the sulfurized-carbon particles is between 50 nanometers and 250 nanometers.
11. The cathode of claim 1 , wherein the carbon nanomaterial extends within and between the sulfurized-carbon particles.
12. The cathode of claim 1 , wherein the carbon nanomaterial comprises at least one of nanotubes and nanoribbons.
13. The cathode of claim 1 , wherein the sulfurized-carbon particles store an alkali metal.
14. The cathode of claim 13 , wherein the sulfurized-carbon particles consist primarily of the sulfur atoms.
15. The cathode of claim 14 , wherein the sulfurized-carbon particles consist essentially of the second carbon atoms and the sulfur atoms.
16. The cathode of claim 15 , wherein the carbon comprises the first and second carbon atoms.
17. The cathode of claim 16 , wherein the agglomerates of sulfurized-carbon particles have a mass ratio of the carbon covalently bonded to the sulfur and the carbon nanomaterial greater than one.
18. The cathode of claim 17 , wherein the mass ratio is greater than ten.
19. The cathode of claim 1 , wherein essentially all the sulfur atoms in the agglomerates of sulfurized-carbon particles is bonded to the carbon of at least one of the first carbon atoms and the second carbon atoms before cycling of the energy-storage device.
Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Oct 11, 2022
From: TOUR, JAMES M.; SALVATIERRA, RODRIGO VILLEGAS; SILVA, GLADYS ANAHI LOPEZ; RAJI, ABDUL-RAMAHN O.
To: WILLIAM MARSH RICE UNIVERSITY
Reel/Frame 061378/0802 →
Continuity (4)
Provisional Application
62905535
· Sep 25, 2019
Provisional Application
62905125
· Sep 24, 2019
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