Garnet-type solid electrolyte and method for preparing the same

Patent metadata

Field	Value
Publication number	US-10096857-B2
Application number	US-201514935762-A
Country	US
Kind code	B2
Filing date	Nov 9, 2015
Priority date	Dec 30, 2014
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

Disclosed are a garnet-type solid electrolyte and a method for preparing the same. The garnet-based solid electrolyte of the present invention is prepared by adding Al2O3 to a precursor containing hydroxide, thereby enhancing sintered density and ionic conductivity while having a pure cubic phase crystal structure without including impurities.

First claim

What is claimed is:

1. A method for preparing a garnet solid electrolyte including Al which substitutes at least a portion of Li, the method comprising:
preparing a mixture of LiOH, La(OH) 3 , ZrO 2 , and Al 2 O 3 ;
first calcinating the mixture for 5 to 7 hours at 800 to 1000° C.;
dry mixing the calcinated mixture after natural cooling;
preparing pellets of 8 to 12 mm using 10 to 80% by weight of the mixture at 120 to 150 MPa, and covering the pellets with the remaining mixture in a powder state; and
preparing a cubic phase garnet solid electrolyte by second calcinating the prepared pellets for 10 to 40 hours at 1100 to 1300° C.

2. The method of claim 1 , wherein the mixture is prepared by a first dry mixing.

3. The method of claim 1 , wherein, the mixture is prepared by mixing the LiOH, the La(OH) 3 , and the ZrO 2 and by adding the Al 2 O 3 thereto.

4. The method of claim 1 , wherein the mixture is prepared by mixing the LiOH, the La(OH) 3 , the ZrO 2 and the Al 2 O 3 at the same time.

5. The method for preparing a garnet solid electrolyte of claim 1 , wherein the garnet solid electrolyte includes the LiOH, the La(OH) 3 and the ZrO 2 at a molar ratio of about 6.5 to 8.3:about 3:about 2.

6. The method of claim 1 , wherein the garnet solid electrolyte includes LLZ (Li 7 La 3 Zr 2 O 12 ) having a cubic phase.

7. The method of claim 1 , wherein the garnet solid electrolyte comprises a content of the Al 2 O 3 in an amount of about 0.5 to 1.5% by weight with respect to the total weight of the mixture.

8. The method of claim 1 , further comprising analyzing the garnet solid electrolyte, 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

Inventors

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

Classifications

• H01M10/0525

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

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M2300/0074

  Ion conductive at high temperature · CPC title

• H01M2300/0071

  Oxides · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title