Lithium stuffed garnet setter plates for solid electrolyte fabrication

Patent metadata

Field	Value
Publication number	US-10563918-B2
Application number	US-201916566615-A
Country	US
Kind code	B2
Filing date	Sep 10, 2019
Priority date	Apr 16, 2015
Publication date	Feb 18, 2020
Grant date	Feb 18, 2020

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:
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
benzyl butyl phthalate;
wherein the benzyl butyl phthalate is present at 5% w/w.

2. The slurry of claim 1 , wherein the acrylic binder comprises methyl methacrylate and ethyl methacrylate.

3. The slurry of claim 1 , wherein the acrylic binder comprises methyl methacrylate.

4. The slurry of claim 1 , wherein the acrylic binder comprises ethyl methacrylate.

5. The slurry of claim 1 , wherein the acrylic binder is a poly methyl methacrylate or poly ethyl-methyl methacrylate.

6. The slurry of claim 1 , further comprising a solvent, wherein the solvent is selected from isopropanol, water, butanol, and tetrahydrofuran.

7. The slurry of claim 1 , wherein the solvent is selected from isopropanol, butanol, and tetrahydrofuran.

8. The slurry of claim 1 , wherein the solvent is tetrahydrofuran.

9. The slurry of claim 1 , further comprising Li 2 ZrO 3 , Li 2 SiO 3 , LiLaO 2 , LiAlO 2 , Li 2 O, or Li 3 PO 4 .

10. The slurry of claim 9 , wherein the slurry comprises Li 2 ZrO 3 .

11. The slurry of claim 9 , wherein the slurry comprises LiAlO 2 .

12. The slurry of claim 9 , wherein the slurry comprises Li 2 O.

13. The slurry of claim 9 , wherein the slurry comprises Li 3 PO 4 .

Assignees

• Quantumscape Corp

Inventors

• Iyer Sriram
• Holme Tim
• Donnelly Niall

Classifications

• C04B2235/94

  Products characterised by their shape · CPC title

• F27D2005/0081

  Details · CPC title

• C04B2235/77

  Density · CPC title

• C04B2235/3203

  Lithium oxide or oxide-forming salts thereof · CPC title

• C04B2235/764

  Garnet structure A3B2(CO4)3 · CPC title