Lithium stuffed garnet setter plates for solid electrolyte fabrication

Patent metadata

Field	Value
Publication number	US-12111109-B2
Application number	US-202117555309-A
Country	US
Kind code	B2
Filing date	Dec 17, 2021
Priority date	Apr 16, 2015
Publication date	Oct 8, 2024
Grant date	Oct 8, 2024

Abstract

Setter plates are fabricated from Li-stuffed garnet materials having the same, or substantially similar, compositions as a garnet Li-stuffed solid electrolyte. The Li-stuffed garnet setter plates, set forth herein, reduce the evaporation of Li during a sintering treatment step and/or reduce the loss of Li caused by diffusion out of the sintering electrolyte. Li-stuffed garnet setter plates, set forth herein, maintain compositional control over the solid electrolyte during sintering when, upon heating, lithium is prone to diffuse out of the solid electrolyte.

First claim

What is claimed is:

1. A slurry comprising:
a lithium-stuffed garnet characterized by the formula Li A La B M′ C M″ D Zr E O F , wherein 4<A<8.5, 1.5<B<4, 0≤C≤2, 0≤D≤2; 0≤E<2, 10<F<13, and M′ and M″ are each, independently in each instance, selected from Al, Mo, W, Nb, Sb, Ca, Ba, Sr, Ce, Hf, Rb, and Ta;
LiAlO 2 ;
a solvent, wherein the solvent is selected from isopropanol, butanol, tetrahydrofuran, and combinations thereof;
an acrylic binder; and
a plasticizer; wherein the plasticizer is present at 5% w/w or less.

2. The slurry of claim 1 , wherein the acrylic binder is present at 5% w/w.

3. The slurry of claim 1 , wherein the plasticizer is dibutyl phthalate or benzyl butyl phthalate.

4. The slurry of claim 2 , wherein the acrylic binder comprises methyl methacrylate and ethyl methacrylate.

5. The slurry of claim 2 , wherein the acrylic binder comprises methyl methacrylate.

6. The slurry of claim 2 , wherein the acrylic binder comprises ethyl methacrylate.

7. The slurry of claim 2 , wherein the acrylic binder is a poly methyl methacrylate or poly ethyl-methyl methacrylate.

8. The slurry of claim 1 , further comprising a solvent, wherein the solvent is selected from isopropanol, butanol, and combinations thereof.

9. The slurry of claim 1 , wherein the solvent is selected from isopropanol, tetrahydrofuran, and combinations thereof.

10. The slurry of claim 9 , wherein the solvent is tetrahydrofuran.

11. A slurry comprising:
a lithium-stuffed garnet characterized by the formula Li A La B M′ C M″ D Zr E O F , wherein 4<A<8.5, 1.5<B<4, 0≤C<2, 0≤D<2; 0≤E<2, 10<F<13, and M′ and M″ are each, independently in each instance, selected from Al, Mo, W, Nb, Sb, Ca, Ba, Sr, Ce, Hf, Rb, and Ta;
an acrylic binder; and
a plasticizer; wherein the plasticizer is present at 5% w/w or less;
wherein the slurry further comprises Li 2 ZrO 3 , Li 2 SiO 3 , LiLaO 2 , LiAlO 2 , Li 2 O, or Li 3 PO 4 .

12. The slurry of claim 11 , wherein the acrylic binder is present at 5% w/w.

13. The slurry of claim 11 , wherein the plasticizer is dibutyl phthalate or benzyl butyl phthalate.

14. The slurry of claim 12 , wherein the acrylic binder comprises methyl methacrylate and ethyl methacrylate.

15. The slurry of claim 12 , wherein the acrylic binder comprises methyl methacrylate.

16. The slurry of claim 12 , wherein the acrylic binder comprises ethyl methacrylate.

17. The slurry of claim 12 , wherein the acrylic binder is a poly methyl methacrylate or poly ethyl-methyl methacrylate.

18. The slurry of claim 11 , further comprising a solvent, wherein the solvent is selected from methanol, ethanol, isopropanol, butanol, pentanol, hexanol, toluene, xylene, tetrahydrofuran, toluene: ethanol, acetone, N-methyl-2-pyrrolidinone (NMP), diacetone alcohol, ethyl acetate, acetonitrile, hexane, nonane, dodecane, methyl ethyl ketone (MEK), and combinations thereof.

19. The slurry of claim 11 , wherein the solvent is selected from isopropanol, butanol, tetrahydrofuran, and combinations thereof.

20. The slurry of claim 19 , wherein the solvent is tetrahydrofuran.

21. The slurry of claim 11 , wherein the slurry comprises Li 2 ZrO 3 .

22. The slurry of claim 11 , wherein the slurry comprises LiAlO 2 .

23. The slurry of claim 11 , wherein the slurry comprises Li 2 O.

24. The slurry of claim 11 , wherein the slurry comprises Li 3 PO 4 .

25. The slurry of claim 11 , wherein the slurry comprises LiLaO 2 .

Assignees

• Quantumscape Battery Inc

Inventors

• Iyer Sriram
• Holme Tim
• Donnelly Niall

Classifications

• H01M2300/0071

  Oxides · CPC title

• H01M10/0481

  Compression means other than compression means for stacks of electrodes and separators · CPC title

• F27D2005/0081

  Details · CPC title

• F27B21/02

  Sintering grates or tables · CPC title

• F27B17/02

  specially designed for laboratory use · CPC title