Solid state battery with uniformly distributed electrolyte, and methods of fabrication relating thereto

Patent metadata

Field	Value
Publication number	US-11942620-B2
Application number	US-202117543160-A
Country	US
Kind code	B2
Filing date	Dec 6, 2021
Priority date	Dec 7, 2020
Publication date	Mar 26, 2024
Grant date	Mar 26, 2024

Abstract

The present disclosure relates to a solid-state electrochemical cell having a uniformly distributed solid-state electrolyte and methods of fabrication relating thereto. The method may include forming a plurality of apertures within the one or more solid-state electrodes; impregnating the one or more solid-state electrodes with a solid-state electrolyte precursor solution so as to fill the plurality of apertures and any other void or pores within the one or more electrodes with the solid-state electrolyte precursor solution; and heating the one or more electrodes so as to solidify the solid-state electrolyte precursor solution and to form the distributed solid-state electrolyte.

First claim

What is claimed is:

1. A method for preparing a solid-state electrochemical cell having one or more solid-state electrodes and a distributed solid-state electrolyte, the method comprising:
preparing the one or more solid-state electrodes by disposing a solid-state electroactive material layer adjacent to a current collector, the solid-state electroactive material layer comprising a plurality solid-state electroactive particles;
punching a plurality of apertures into the one or more solid-state electrodes, the plurality of apertures extending continuously through the solid-state electroactive material layer and the current collector;
impregnating the one or more solid-state electrodes with a solid-state electrolyte precursor solution so as to fill the plurality of apertures and any other void or pores within the one or more electrodes with the solid-state electrolyte precursor solution; and
heating the one or more electrodes so as to solidify the solid-state electrolyte precursor solution and to form the distributed solid-state electrolyte.

2. The method of claim 1 , wherein the solid-state electrolyte precursor solution comprises one or more solid-state electrolyte materials homogeneously distributed in solution, wherein the one or more solid-state electrolyte materials comprise one or more sulfide solid-state electrolytes, halide-based solid-state electrolytes, polymer-based solid-state electrolytes, and combinations thereof.

3. The method of claim 2 , wherein the one or more sulfide solid-state electrolyte is selected from the group consisting of: Li 3 PS 4 , Li 7 P 3 S 11 , Li 4 SnS 4 , 80Li 2 S·20P 2 S 5 , Li 3.25 Ge 0.25 P 0.75 S 4 , Li 6 PS 5 Br, Li 6 PS 5 Cl, Li 7 P 2 S 8 I, Li 4 PS 4 I, LiI—Li 4 SnS 4 , Li 9.54 Si 1.74 P 1.44 S 11.7 Cl 0.3 , Li 10.35 [Sn 0.27 Si 1.08 ]P 1.65 S 12 , and combinations thereof,
wherein the one or more halide-based solid-state electrolytes is selected from the group consisting of LiI, Li 2 CdCl 4 , Li 2 MgCl 4 , Li 2 CdI 4 , Li 2 ZnI 4 , Li 3 OCl, and combinations thereof, and
wherein the one or more polymer-based solid-state electrolytes is selected from the group consisting of polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), polyethylene oxide (PEO), polypropylene oxide (PPO), polyacrylonitrile (PAN), polymethacrylonitrile (PMAN), polymethyl methacrylate (PMMA), and combinations thereof.

4. The method of claim 1 , wherein the one or more electrodes are heated to a temperature greater than or equal to about 50° C. to less than or equal to about 300° C.

5. The method of claim 1 , wherein the method further comprises:
forming a solid-state electrolyte layer on an exposed surface of the solid-state electroactive material layer, wherein the solid-state electrolyte layer is formed by a plurality of solid-state electrolyte particle and the solid-state electrolyte layer is also impregnated with the solid-state electrolyte precursor solution.

6. The method of claim 5 , wherein the plurality of apertures extend continuously through solid-state electrolyte layer, the solid-state electroactive material layer, and the current collector.

7. The method of claim 1 , wherein the one or more electrodes comprise at least one positive electrode and at least one negative electrode and the method further comprises stacking the at least one positive electrode and the at least one negative electrode so as to form the solid-state electrochemical cell, wherein any void or pore within the solid-state electrochemical cell is also impregnated with the solid-state electrolyte precursor solution.

8. The method of claim 7 , wherein a separator is disposed between the at least one positive electrode and the at least one negative electrode, wherein the separator is also impregnated with the solid-state electrolyte precursor solution.

9. The method of claim 8 , wherein a solid-state electrolyte layer is disposed between the separator and the at least one positive electrode, wherein the solid-state electrolyte layer is formed by a plurality of solid-state electrolyte particle and the solid-state electrolyte layer is also impregnated with the solid-state electrolyte precursor solution.

10. The method of claim 8 , wherein a solid-state electrolyte layer is disposed between the separator and the at least one negative electrode, wherein the solid-state electrolyte layer is formed by a plurality of solid-state electrolyte particle and the solid-state electrolyte layer is also impregnated with the solid-state electrolyte precursor solution.

11. The method of claim 7 , wherein a first solid-state electrolyte layer is disposed adjacent to the at least one positive electrode and a second solid-state electrolyte layer is disposed adjacent to the at least one negative electrode, and the first and second solid-state electrolyte layers are also impregnated with the solid-state electrolyte precursor solution, and
wherein the first solid-state electrolyte layer comprises a first plurality of solid-state electrolyte particles and the second solid-state electrolyte layer comprises a second plurality of solid-state electrolyte particles, and the first plurality of solid-state electrolyte particles is the same or different from the second plurality of solid-state electrolyte particles.

12. The method of claim 11 , wherein the plurality of apertures comprises:
a first plurality of apertures that extends continuously through the first solid-state electrolyte layer and the at least one positive electrode; and
a second plurality of apertures that extends continuously through the second solid-state electrolyte layer and the at least one negative electrode.

13. The method of claim 11 , wherein a separator is disposed between the first solid-state electrolyte layer and the second solid-state electrolyte layer, wherein the separator is also impregnated with the solid-state electrolyte precursor solution.

14. A method for preparing a solid-state electrochemical cell having a distributed solid-state electrolyte, the method comprising:
disposing a first solid-state electroactive material layer adjacent a first current collector so as to form a first electrode;
forming a first plurality of apertures within the first electrode, wherein the first plurality of apertures extends continuously through the first solid-state electroactive material layer and the first current collector;
disposing a second solid-state electroactive material layer adjacent a second current collector so as to form a second electrode;
forming a second plurality of apertures within the second electrode, wherein the second plurality of apertures extends continuously through the second solid-state electroactive material layer and the second current collector;
stacking the first and second electrodes so as to form the solid-state electrochemical cell;
impregnating the solid-state electrochemical cell with a solid-state electrolyte precursor solution so as to fill the first and second pluralities of apertures and any other void or pore within the solid-state electrochemical cell with the solid-state electrolyte precursor solution; and
heating the solid-state electrolyte precursor solution so as to solidify the solid-state electrolyte precursor solution and to form the distributed solid-state electrolyte.

15. The method of claim 14 , wherein one or more solid-state electrolyte layers are disposed between the first electrode and the second electrode, wherein each of the one or more solid-state electrolyte layers is formed by a plurality of solid-state electrolyte particle and the one or more solid-state electrolyte layers are also im

Assignees

• Gm Global Tech Operations Llc

Inventors

• Lu Yong
• Li Zhe
• Que Xiaochao
• Liu Haijing
• Wu Meiyuan

Classifications

• H01M4/0416 Primary

  involving impregnation with a solution, dispersion, paste or dry powder (H01M4/0438 takes precedence) · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M10/0525 Primary

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

• H01M10/0565

  Polymeric materials, e.g. gel-type or solid-type · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title