Lithium stuffed garnet setter plates for solid electrolyte fabrication

Patent metadata

Field	Value
Publication number	US-2025164189-A1
Application number	US-202519030063-A
Country	US
Kind code	A1
Filing date	Jan 17, 2025
Priority date	Apr 16, 2015
Publication date	May 22, 2025
Grant date	—

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 setter plate for fabricating solid electrolytes of a rechargeable battery, the setter plate comprising:
a Li-stuffed garnet compound characterized by the formula Li x La y Zr z O t ·qAl 2 O 3 , wherein 4<x<10, 1<y<4, 1<z<3, 6<t<14, 0≤q≤1; a surface defined by a first lateral dimension from 2 cm to 30 cm and a second lateral dimension from 2 cm to 30 cm; and a thickness from 0.1 mm to 100 mm.

2 . The setter plate of claim 1 , wherein a surface is defined by a first lateral dimension from 5 cm to 20 cm and a second lateral dimension from 5 cm to 20 cm.

3 . The setter plate of claim 1 , wherein the thickness is from 1 mm to 100 mm.

4 . The setter plate of claim 1 , wherein the thickness is from 0.1 mm to 10 mm.

5 . The setter plate of claim 1 , wherein the thickness is from 0.5 mm to 5 mm.

6 . The setter plate of claim 1 , wherein the thickness is from 1 mm to 1.5 mm.

7 . The setter plate of claim 1 , wherein the Li-stuffed garnet compound comprises grains from 1 microns in diameter to 400 microns in diameter.

8 . The setter plate of claim 1 , wherein the Li-stuffed garnet compound comprises grains having a grain size from 2 microns to 10 microns.

9 . The setter plate of claim 1 , wherein the Li-stuffed garnet compound comprises grains having a grain size from 100 microns to 400 microns.

10 . The setter plate of claim 1 , wherein the surface has a surface roughness from 1.0 μm Ra to 4 μm Ra, wherein Ra is an arithmetic average of absolute values of sampled surface roughness amplitudes.

11 . The setter plate of claim 1 , wherein the surface has a surface roughness from 0.5 μm Rt to 30 μm Rt, wherein Rt is the maximum peak height of sampled surface roughness amplitudes.

12 . The setter plate of claim 10 , wherein the surface roughness is from 1.6 μm Ra to 2.2 μm Ra.

13 . The setter plate of claim 10 , wherein the surface roughness is from 3.2 μm Ra to 3.7 μm Ra.

14 . The setter plate of claim 1 , wherein the surface roughness is from 1 μm Rt to 28 μm Rt.

15 . The setter plate of claim 1 , wherein the surface roughness is from 10 μm Rt to 30 μm Rt.

16 . The setter plate of claim 1 , wherein the surface roughness is from 15 μm Rt to 30 μm Rt.

17 . The setter plate of claim 1 , wherein the crystallite size in the grains is about 200 nm to 1 μm.

18 . The setter plate of claim 1 , wherein the crystallite size in the grains is about 100 nm to 5 μm.

19 . The setter plate of claim 1 , wherein q is 0.35 or 1.

Assignees

• Quantumscape Battery Inc

Inventors

• Iyer Sriram
• Holme Timothy
• 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