Garnet powder, manufacturing method thereof, solid electrolyte sheet using hot press and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-11075403-B2
Application number	US-201816000703-A
Country	US
Kind code	B2
Filing date	Jun 5, 2018
Priority date	Aug 18, 2014
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

The present disclosure relates to garnet powder, a manufacturing method thereof, a solid electrolyte sheet using a hot press, and a manufacturing method thereof. In particular, the present disclosure provides a method for manufacturing Li 7 La 3 Zr 2 O 12 (LLZ) garnet powder including preparing a mixture by first dry mixing Li 2 CO 3 , La 2 O 3 , ZrO 2 , and Al 2 O 3 . The mixture is first calcinated for 5 to 7 hours in a temperature range of 800 to 1000° C. The calcinated mixture is ground to a powder with an average particle size of 1 to 4 μm through dry grinding. A cubic-phased LLZ garnet powder is prepared by second calcinating the ground mixture for 10 to 30 hours in a temperature range of 1100 to 1300° C.

First claim

What is claimed is:

1. A method for manufacturing a solid electrolyte sheet using a hot press, the method comprising:
preparing a garnet powder having a cubic-phased crystal structure,
wherein the garnet powder includes Li, La and Zr;
wherein the molar ratio of Li:La:Zr in the garnet powder is 6.5 to 8.3:3:2;
wherein some of the Li in the garnet powder is substituted with Al; and
wherein the Al is substituted in a range of 0.02 to 1.075 mol;
manufacturing a solid electrolyte sheet by hot pressing the garnet powder for 30 minutes to 2 hours in a temperature range of 1050 to 1250° C. under an oxygen free atmosphere.

2. The method for manufacturing a solid electrolyte sheet of claim 1 , wherein a thickness of the solid electrolyte sheet ranges from 0.01 to 5 mm.

3. The method for manufacturing a solid electrolyte sheet of claim 1 , wherein ionic conductivity of the solid electrolyte sheet ranges from 6×10 −4 to 10×10 −4 S/cm.

4. The method for manufacturing a solid electrolyte sheet of claim 1 , further comprising analyzing the solid electrolyte sheet, wherein the analysis is carried out using X-Ray Diffraction (XRD), Raman Spectroscopy, or Inductively Coupled Plasma Mass Spectrometry (ICP-MS).

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Sung Ju Young
• Lee Ho Taek
• Kwon Eun Ji
• Jang Yong Jun
• Kim Ji Na

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0525

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

• C01G25/006

  Compounds containing zirconium, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• H01M2300/0071

  Oxides · CPC title