Lithium-Based Solid-State Electrolyte with Lithium Ions Exchanged by Ions Having a Larger Ionic Radius

Patent metadata

Field	Value
Publication number	US-2025096310-A1
Application number	US-202418884537-A
Country	US
Kind code	A1
Filing date	Sep 13, 2024
Priority date	Sep 18, 2023
Publication date	Mar 20, 2025
Grant date	—

Abstract

The present disclosure describes a method of providing residual compressive stress to a lithium-based solid electrolyte by ion exchanging lithium ions with ions having a larger ionic radius that the lithium ions.

First claim

1 . A method of providing residual compressive stress to a lithium-based solid electrolyte comprising
subjecting the lithium-based solid electrolyte to ion exchange conditions where lithium ions within the lithium-based solid electrolyte are exchanged with ions in a sub surface region of the lithium-based solid electrolyte so as to impart residual compressive stresses in the sub-surface region of the lithium-based solid electrolyte, wherein the ions have a larger ionic radius than the lithium ions.

2 . The method of claim 1 wherein the ions are members of the group consisting of potassium ions, silver ions, sodium ions, and calcium ions and mixtures thereof.

3 . The method of claim 1 wherein lithium ions are exchanged with ions having a larger ionic radius than the lithium ions in an amount to allow sufficient lithium ion diffusion for performance of the solid state electrolyte in a solid-state battery.

4 . The method of claim 1 wherein the ions are potassium ions.

5 . The method of claim 1 wherein between 2% and 5% lithium ions of the lithium-based solid electrolyte are exchanged with potassium ions.

6 . The method of claim 1 wherein between 3% and 4% lithium ions of the lithium-based solid electrolyte are exchanged with potassium ions.

7 . The method of claim 1 wherein 3.4% lithium ions of the lithium-based solid electrolyte are exchanged with potassium ions.

8 . The method of claim 1 wherein the lithium-based solid electrolyte comprises lithium lanthanum zirconium oxide.

9 . The method of claim 1 wherein the lithium-based solid electrolyte is contacted with a source of ions and heated to a temperature sufficient to promote exchange of lithium ions of the lithium-based solid electrolyte with ions of the source of ions.

10 . The method of claim 1 wherein the residual compressive stresses inhibit dendrite formation in the lithium-based solid electrolyte.

11 . The method of claim 1 wherein the subsurface region is at least 40 microns deep from the surface of the lithium-based solid electrolyte.

12 . The method of claim 1 wherein the subsurface region is at least 20 microns deep from the surface of the lithium-based solid electrolyte.

13 . The method of claim 1 wherein the ion exchange depth ratio is 0.2% to 4% of the thickness of the lithium-based solid electrolyte.

14 . The method of claim 1 wherein lithium ions diffuse out of the lithium-based solid electrolyte and the ions from a source of ions diffuse into the lithium-based solid electrolyte.

15 . The method of claim 1 wherein the ions are silver ions.

16 . The method of claim 1 wherein the ions are monovalent or divalent cationic ions.

17 . A lithium-based solid electrolyte comprising diffused potassium ions or diffused silver ions.

18 . The lithium-based solid electrolyte of claim 17 wherein the amount of diffused potassium ions or diffused silver ions allow sufficient lithium ion diffusion for performance of the solid-state electrolyte in a solid-state battery.

19 . The lithium-based solid electrolyte of claim 17 comprising lithium lanthanum zirconium oxide.

20 . The lithium-based solid electrolyte of claim 17 having a higher residual compressive stress compared to a lithium-based solid electrolyte lacking diffused potassium ions or diffused silver ions.

21 . The lithium-based solid electrolyte of claim 17 resistant to dendrite formation.

22 . A solid-state battery comprising the lithium-based solid electrolyte of claim 17 .

Assignees

• Univ Brown

Inventors

• Sheldon Brian W
• Qi Yue
• Morris Sydney
• Jagad Harsh D
• Harris Stephen J

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M10/054 Primary

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title