Thin cathode for micro-battery

Patent metadata

Field	Value
Publication number	US-11289704-B2
Application number	US-201916684891-A
Country	US
Kind code	B2
Filing date	Nov 15, 2019
Priority date	Jun 22, 2017
Publication date	Mar 29, 2022
Grant date	Mar 29, 2022

Abstract

Methods of forming a battery include forming a thin graphene cathode on a substrate. A lithium anode is formed and an electrolyte is formed between the thin graphene cathode and the lithium anode.

First claim

What is claimed is:

1. A method of forming a battery, comprising:
forming a thin graphene cathode on a flexible substrate;
forming a lithium anode; and
forming an electrolyte between the thin graphene cathode and the lithium anode.

2. The method of claim 1 , wherein the thin graphene cathode is a layer selected from the group consisting of single-layer grapheme and double-layer graphene.

3. The method of claim 1 , wherein the electrolyte comprises 1,2-dimethoxyethane.

4. The method of claim 1 , wherein the electrolyte comprises tetraethylene glycol dimethyl ether.

5. The method of claim 1 , wherein the electrolyte comprises a solute selected from the group consisting of LiNO 3 and (Lithium Bis(trifluoromethanesulfonyl)imide).

6. The method of claim 1 , further comprising positioning a current collector in the electrolyte between the cathode and a separator.

7. The method of claim 6 , wherein the current collector is a metal mesh formed from a material selected from the group consisting of stainless steel and titanium.

8. The method of claim 7 , wherein the metal mesh has openings that are smaller than about 38 μm.

9. The method of claim 1 , wherein forming the thin graphene cathode comprises:
depositing the thin graphene layer on an initial surface, the initial surface being a copper layer;
transferring the thin graphene layer from the initial surface to an intermediate surface, the intermediate surface comprising a material with etch selectivity with the copper layer; and
transferring the thin graphene layer from the intermediate surface to the substrate.

10. The method of claim 9 , further comprising patterning the thin graphene layer after transferring the thin graphene layer to the intermediate surface.

11. The method of claim 1 , wherein the electrolyte is a fluid through which lithium ions migrate from the anode to form Li 2 O 2 at a surface of the cathode, further comprising connecting the current collector to an external circuit.

12. A method of forming a battery, comprising:
forming a cathode on a flexible substrate from a single- or double-layer graphene material; forming a lithium anode;
forming an electrolyte having a high solubility for lithium ions and oxygen between the cathode and the lithium anode, such that lithium ions migrate from the anode through the electrolyte to form Li 2 O 2 at a surface of the cathode; and
positioning a current collector formed from a metal mesh in the electrolyte.

13. The method of claim 12 , wherein the electrolyte comprises 1,2-dimethoxyethane.

14. The method of claim 12 , wherein the electrolyte comprises tetraethylene glycol dimethyl ether.

15. The method of claim 12 , wherein the electrolyte comprises a solute selected from the group consisting of LiNO 3 and (Lithium Bis(trifluoromethanesulfonypimide).

16. The method of claim 12 , wherein the current collector is a metal mesh formed from a material selected from the group consisting of stainless steel and titanium and wherein the metal mesh has openings that are smaller than about 38 μm.

17. The method of claim 12 , wherein forming the thin graphene cathode comprises:
depositing the thin graphene layer on an initial surface, the initial surface being a copper layer;
transferring the thin graphene layer from the initial surface to an intermediate surface, the intermediate surface comprising a material with etch selectivity with the copper layer; and
transferring the thin graphene layer from the intermediate surface to the substrate.

18. The method of claim 17 , further comprising patterning the thin graphene layer after transferring the thin graphene layer to the intermediate surface.

19. The method of claim 17 , wherein the intermediate surface is formed from a material selected from the group consisting of poly(methyl methacrylate) and ethylene-vinyl acetate.

Assignees

• IBM
• Aselsan Elektronik Sanayi Ve Ticaret A S

Inventors

• Akca Esin
• Akgun Cagla
• Demirci Gokhan
• Farmer Damon B
• Han Shu-Jen
• Maune Hareem T
• Oh Dahyun

Classifications

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M4/583 Primary

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

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• C01B32/186 Primary

  by chemical vapour deposition [CVD] · CPC title