IP Library › Granted Patent US 12,261,284
Granted Patent B2
US 12,261,284 · App. 13/833,377 · Granted Mar 25, 2025

Protective structures for electrodes

Inventors: Marina M. Safont Sempere (Sahuarita, AZ); Chariclea Scordilis-Kelley (Tucson, AZ)
Assignee: Sion Power Corporation
H01M4/1395H01M4/0402H01M4/134H01M4/382H01M4/62H01M2004/021H01M4/366H01M6/187H01M10/0525H01M2300/0094Y02E60/10
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Quick Facts
Patent No.
US 12,261,284
App. No.
13/833,377
Granted
Mar 25, 2025
Kind
B2
Abstract

A protective structure for use with metallic lithium (or other alkali or alkali earth metals) and its method of manufacture are provided. The protective structure may include a substantially continuous and substantially nonporous buffer layer disposed on the metallic lithium layer which is conductive to lithium ions. A substantially continuous and substantially nonporous protective layer may be disposed on the buffer layer.

Claims (38)

1. An electrode structure comprising:

a metallic lithium layer;

a substantially continuous and substantially nonporous buffer layer disposed directly on the metallic lithium layer, wherein the buffer layer is a ceramic layer, a glassy-ceramic layer, or a glass layer and is conductive to lithium ions, wherein the buffer layer comprises carbon, wherein lithium makes up between 45 mol % and 65 mol % of the buffer layer, wherein nitrogen makes up between 0 mol % and 5 mol % of the buffer layer, wherein oxygen makes up between 25 mol % and 40 mol % of the buffer layer, and for which a molar ratio of lithium to carbon is greater than or equal to 1.75:1; and

a substantially continuous and substantially nonporous lithium nitride layer disposed directly on the buffer layer.

2. An electrode structure comprising:

an electroactive material layer comprising an electroactive species, wherein the electroactive species comprises metallic lithium;

a substantially continuous and substantially nonporous buffer layer disposed directly on the electroactive material layer, wherein the buffer layer is a ceramic layer, a glassy-ceramic layer, or a glass layer and is conductive to ions of the electroactive species, wherein the buffer layer comprises carbon, wherein lithium makes up between 45 mol % and 65 mol % of the buffer layer, wherein nitrogen makes up between 0 mol % and 5 mol % of the buffer layer, wherein oxygen makes up between 25 mol % and 40 mol % of the buffer layer, and for which a molar ratio of lithium to carbon is greater than or equal to 1.75:1; and

a substantially continuous and substantially nonporous protective layer disposed directly on the buffer layer, wherein the protective layer is formed using a gas, a plasma, a material, or a fluid that is reactive with the electroactive material layer.

3. A method for forming an electrode structure, the method comprising:

providing a metallic lithium layer;

after providing the metallic lithium layer, depositing a substantially continuous and substantially nonporous buffer layer directly onto the metallic lithium layer, wherein the buffer layer is a ceramic layer, a glassy-ceramic layer, or a glass layer and is conductive to lithium ions, wherein the buffer layer comprises carbon, wherein lithium makes up between 45 mol % and 54 mol % of the buffer layer, wherein nitrogen makes up between 0 mol % and 5 mol % of the buffer layer, wherein oxygen makes up between 25 mol % and 40 mol % of the buffer layer, and for which a molar ratio of lithium to carbon is greater than or equal to 1.75:1; and

after depositing the substantially continuous and substantially nonporous buffer layer directly onto the metallic lithium layer, depositing a substantially continuous and substantially nonporous lithium nitride layer directly onto the buffer layer.

4. The electrode structure of claim 1 , wherein the buffer layer is the ceramic layer.

5. The electrode structure of claim 1 , wherein the buffer layer comprises at least one of lithium oxide, lithium phosphorus oxynitride, lithium oxynitride, lithium carbonate, a lithium halide, lithium iodide, and lithium bromide.

6. The electrode structure of claim 1 , wherein the buffer layer comprises nitrogen.

7. The electrode structure of claim 1 , wherein the buffer layer is substantially amorphous.

8. The electrode structure of claim 1 , wherein the buffer layer is polycrystalline.

9. The electrode structure of claim 2 , wherein the protective layer comprises at least one of lithium nitride, lithium silicate, lithium borate, lithium aluminate, lithium phosphate, lithium silicosulfide, lithium germanosulfide, a lithium lanthanum oxide, a lithium titanium oxide, lithium borosulfide, lithium aluminosulfide, lithium phosphosulfide.

10. The electrode structure of claim 1 , wherein the buffer layer is nonstoichiometric.

11. The electrode structure of claim 1 , wherein the buffer layer has a molar ratio of lithium to carbon that is less than or equal to 2:1.

12. The electrode structure of claim 1 , wherein the lithium nitride layer is substantially amorphous.

13. The electrode structure of claim 1 , wherein a thickness of the buffer layer is between 200 nm and 1 μm.

14. The electrode structure of claim 1 , wherein a thickness of the lithium nitride layer is between 2 and 10 times a thickness of the buffer layer.

15. The electrode structure of claim 1 , wherein a charge transfer resistance across the lithium nitride layer and buffer layer is less than the charge transfer resistance across the buffer layer without the lithium nitride layer.

16. The electrode structure of claim 1 , wherein the lithium nitride layer has an arithmetic mean surface roughness of less than or equal to 150 nm.

17. The electrode structure of claim 1 , wherein an arithmetic mean surface roughness (Ra) of the lithium nitride layer is between 50 nm and 150 nm.

18. The electrode structure of claim 9 , further comprising a release layer disposed on a surface of at least one of the electroactive material layer and the protective layer.

19. The electrode structure of claim 18 , further comprising a carrier substrate disposed on the release layer.

20. The electrode structure of claim 1 , wherein the lithium nitride layer is a single, ceramic layer.

21. The electrode structure of claim 1 , wherein the electrode structure consists essentially of the metallic lithium layer, the buffer layer, and the lithium nitride layer.

22. The electrode structure of claim 1 , wherein the electrode structure comprises a protective structure including no more than two layers, and wherein the two layers are the buffer layer and the lithium nitride layer.

23. An electrochemical cell comprising the electrode structure of claim 22 , wherein the electrochemical cell further comprises an electrolyte.

24. The electrode structure of claim 1 , wherein the buffer layer comprises lithium oxide.

25. The electrode structure of claim 1 , wherein the buffer layer comprises a dopant, and wherein the lithium nitride layer comprises a dopant.

26. The electrode structure of claim 1 , wherein lithium makes up between 10 wt % and 50 wt % of the buffer layer, wherein nitrogen makes up between 0 wt % and 50 wt % of the buffer layer, and wherein oxygen makes up between 50 wt % and 70 wt % of the buffer layer.

27. The electrode structure of claim 1 , wherein the buffer layer comprises a glass formed from lithium carbonate and lithium oxide.

28. The electrode structure of claim 1 , wherein the buffer layer has a lithium ion conductivity of greater than or equal to 10 −5 S/cm.

29. The electrode structure of claim 1 , wherein the buffer layer has a lithium ion conductivity of less than or equal to 10 −4 S/cm.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 4, 2014
From: SAFONT SEMPERE, MARINA M.; SCORDILIS-KELLEY, CHARICLEA
To: SION POWER CORPORATION
Reel/Frame 032136/0765 →
Continuity (1)
Related Publication 20140272594A1 · Sep 18, 2014
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