High performance electrodes, materials, and precursors thereof

Patent metadata

Field	Value
Publication number	US-11302920-B2
Application number	US-201615775776-A
Country	US
Kind code	B2
Filing date	Nov 10, 2016
Priority date	Nov 12, 2015
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

Provided herein are high performance electrodes, electrode materials comprising a plurality of active electrode material-containing particles secured within one or more graphenic web, and precursors thereof. Also provided herein are processes of generating the same by an electrospray process.

First claim

What is claimed is:

1. A process for manufacturing a silicon-carbon electrode or electrode material, the process comprising:
a. producing an electrostatically charged plume comprising a plurality of droplets from a fluid stock by:
i. providing the fluid stock to a first inlet of a first conduit of an electrospray nozzle, the first conduit being enclosed along the length of the conduit by a first wall having an interior surface and an exterior surface, the first conduit having a first outlet,
the fluid stock comprising a plurality of inclusions and a liquid medium,
the inclusions comprising a plurality of silicon-containing microparticles and a plurality of graphene components,
the plurality of silicon-containing microparticles comprising SiOx, wherein 0≤x≤0.5, and having an average diameter, length, or width of less than 20 micron; and
the weight ratio of the plurality of silicon-containing microparticles to the plurality of graphene components present in the fluid stock being at least 1:2 and

ii. providing a voltage to the electrospray nozzle; and

b. collecting a first composition on a substrate, the first composition comprising one or more graphenic web bearing one or more of the plurality of silicon-containing microparticles, the one or more first graphenic web comprising the plurality of graphene components having an average length and/or width that is at least 2 times greater than an average of a smallest diameter, length and/or width of the silicon containing microparticles.

2. The process of claim 1 , further comprising providing a pressurized gas to a second inlet of a second conduit of the nozzle, the second conduit having a second inlet and a second outlet, and at least a portion of the second conduit being positioned in surrounding relation to the first conduit.

3. The process of claim 2 , wherein the second conduit is enclosed by a second wall, the second wall having an interior surface, the average distance between the exterior surface of the first wall and the interior surface of the second wall being about 0.01 mm to about 30 mm.

4. The process of claim 2 , wherein the gas has a velocity of at least 0.5 m/s at the second outlet.

5. The process of claim 1 , wherein the process comprises collecting the first composition on the substrate, the substrate having a substrate surface in opposing relation to the electrospray nozzle.

6. The process of claim 2 , wherein the process comprises collecting the first composition on the substrate, the substrate having a substrate surface in opposing relation to the electrospray nozzle.

7. The process of claim 6 , wherein the substrate is affixed to or a part of a conveyor system.

8. The process of claim 1 , further comprising thermally treating the first composition to yield a second composition comprising a plurality of silicon-containing microparticles covered by, coated by, enveloped by, wrapped within, trapped within, or a combination thereof one or more second graphenic web, the one or more second graphenic web comprising a plurality of graphene components.

9. The process of claim 8 , wherein the second composition comprises about 50 wt. % to about 95 wt. % of SiOx.

10. The process of claim 8 , wherein the reduced graphene components constitute about 5 wt. % to about 50 wt. % of the second composition.

11. The process of claim 8 , further comprising, prior to thermally treating the first composition, compressing the first composition to form a first compressed composition, wherein the first compressed composition is thermally treated to yield the second composition, and/or
compressing the second composition, which has not been compressed, to form a second compressed composition.

12. The process of claim 11 , wherein the first composition, the second composition, the first compressed composition, the second compressed composition, or any combination thereof, have a thickness of about 1 mm or less.

13. The process of claim 12 , wherein the first composition has a bulk density of about 0.5 grams per cubic centimeter or more.

14. The process of claim 1 , wherein the silicon-containing microparticles and the plurality of graphene components constitute at least 80 wt. % of the total inclusion content of the fluid stock.

15. The process of claim 1 , wherein 0<x0.5 for SiOx.

16. The process of claim 1 , wherein at least a portion of the one or more graphenic web defines one or more first envelope and/or one or more first pocket and the first composition comprises the one or more graphenic web, one or more first envelope, one or more first pocket, or a combination thereof.

17. The process of claim 1 , wherein at least a portion of the plurality of silicon-containing microparticles is covered by, coated by, wrapped by, enveloped by, trapped within, or a combination thereof, the one or more graphenic web.

18. The process of claim 8 , wherein the first graphenic web comprises graphene oxide and the second graphenic web comprises at least partially de-oxygenated graphene oxide.

19. The process of claim 8 , wherein the first graphenic web shrinks to form a second graphenic web configured to enclose the silicon-containing microparticles within the second graphenic web.

20. The process of claim 8 , wherein a temperature of the thermally treating is in a range of about 100° C. to about 400° C.

21. The process of claim 1 , wherein the first composition comprises a continuous graphenic web extends throughout the first composition to form a continuous self-supporting film and wherein the continuous graphenic web is configured to form a plurality of graphenic pockets comprising graphenic interconnectivity between graphenic pockets and wherein each of the graphenic pocket contains one or more of the plurality of silicon-containing microparticles within the graphenic pocket.

Assignees

• Univ Cornell

Inventors

• Joo Yong Lak
• Fei Ling

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0525

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

• B05B5/03

  characterised by the use of gas {, e.g. electrostatically assisted pneumatic spraying (B05B5/04, B05B5/043, B05B5/047 take precedence)} · CPC title

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M4/366

  as layered products · CPC title