Garnet materials for Li secondary batteries and methods of making and using garnet materials

Patent metadata

Field	Value
Publication number	US-10290895-B2
Application number	US-201414509029-A
Country	US
Kind code	B2
Filing date	Oct 7, 2014
Priority date	Oct 7, 2013
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

Set forth herein are garnet material compositions, e.g., lithium-stuffed garnets and lithium-stuffed garnets doped with alumina, which are suitable for use as electrolytes and catholytes in solid state battery applications. Set forth herein are lithium-stuffed garnet thin films having fine grains therein. Disclosed herein are novel and inventive methods of making and using lithium-stuffed garnets as catholytes, electrolytes and/or anolytes for all solid state lithium rechargeable batteries. Disclosed herein are novel electrochemical devices which incorporate these garnet catholytes, electrolytes and/or anolytes. Set forth herein are methods for preparing novel structures, including dense thin free standing membranes of an ionically conducting material for use as a catholyte, electrolyte, and, or, anolyte, in an electrochemical device, a battery component (positive or negative electrode materials), or a complete solid state electrochemical energy storage device. The methods set forth herein disclose novel sintering techniques for solid state energy storage devices and the components thereof.

First claim

What is claimed is:

1. A sintered thin film comprising a lithium-stuffed garnet and Al 2 O 3 , wherein the lithium-stuffed garnet is characterized by the empirical formula Li A La B Zr E O F , wherein 5.5<A<6.7, 3≤B<4, 1≤E≤2, 10<F≤13; and wherein the molar ratio of Al 2 O 3 :garnet is between 0.05 to 0.7, wherein the sintered thin film has a film thickness of about 10 nm to about 100 μm; and wherein the sintered thin film has grains having a d 50 diameter between 100 nm and 10 μm.

2. The sintered thin film of claim 1 , wherein the thin film is characterized by the empirical formula Li x La 3 Zr 2 O 12 .y½Al 2 O 3 , wherein 5.5<x<6.7 and 0.1<y<1.4.

3. The sintered thin film of claim 1 , wherein the molar ratio of Al 2 O 3 :garnet is between 0.25 and 0.45.

4. The sintered thin film of claim 1 , wherein the molar ratio of Al 2 O 3 :garnet is 0.35.

5. An electrochemical device having an electrolyte according to the sintered thin film of claim 1 .

6. The sintered thin film of claim 1 , wherein the film thickness is less than 50 μm and greater than 10 nm.

7. The sintered thin film of claim 1 , wherein the thin film is a thin film monolith.

8. The sintered thin film of claim 1 , wherein the thin film is a sintered thin film monolith.

9. The sintered thin film of claim 1 , wherein the thin film has a density of about 4.5-5.2 g/cm 3 .

Assignees

• Quantumscape Corp

Inventors

• Holme Tim
• Donnelly Niall
• Iyer Sriram
• Winoto Adrian
• Singh Mohit
• Hudson Will
• Choi Dong Hee Anna
• Karpenko Oleh

Classifications

• H01M2300/0071

  Oxides · CPC title

• C04B2235/3256

  Molybdenum oxides, molybdates or oxide forming salts thereof, e.g. cadmium molybdate · CPC title

• C04B2235/656

  characterised by specific heating conditions during heat treatment · CPC title

• C04B35/486

  Fine ceramics · CPC title

• C04B2235/3229

  Cerium oxides or oxide-forming salts thereof · CPC title