Solid electrolyte particles, preparation method thereof, and lithium secondary battery comprising the same

Patent metadata

Field	Value
Publication number	US-10128531-B2
Application number	US-201414429687-A
Country	US
Kind code	B2
Filing date	Oct 24, 2014
Priority date	Oct 24, 2013
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

Provided are a method of preparing solid electrolyte particles of Chemical Formula 1 including preparing a precursor solution by mixing a titanium precursor, a lanthanum precursor, and a lithium precursor in an aqueous or organic solvent, and heat treating the precursor solution, solid electrolyte particles prepared thereby, and a lithium secondary battery including the solid electrolyte particles:

Li 3x La (2/3-x) TiO 3 (0<x<0.16).  <Chemical Formula 1>

According to a method of preparing solid electrolyte particles according to an embodiment of the present invention, solid electrolyte particles may be easily prepared by heat treating at low temperature for a short period of time.

First claim

The invention claimed is:

1. A method of preparing solid electrolyte particles of Chemical Formula 1, the method comprising:
preparing a precursor solution by mixing a titanium precursor, a lanthanum precursor, and a lithium precursor in an aqueous or organic solvent; and
heat treating the precursor solution to obtain the solid electrolyte particles,
wherein the titanium precursor comprises titanium oxide particles having an average particle diameter of 0.5 nm to 10 nm, and
wherein the solid electrolyte particles have an average particle diameter (D 50 ), which is a particle diameter at 50% in a cumulative particle diameter distribution, of 20 nm to 100 nm:
Li 3x La (2/3-x) TiO 3 (0<x<0.16)  <Chemical Formula 1>.

2. The method of claim 1 , wherein the average particle diameter of the titanium oxide particles is in a range of 0.5 nm to 5 nm.

3. The method of claim 1 , wherein the titanium precursor is titanium oxide powder or a titanium oxide colloidal solution.

4. The method of claim 1 , wherein the heat treatment is performed in a temperature range of 700° C. to 1,000° C.

5. The method of claim 4 , wherein the heat treatment is performed for 1 minute to 60 minutes.

6. The method of claim 5 , wherein the heat treatment is performed for 1 minute to 10 minutes.

7. The method of claim 1 , wherein the mixing is performed by using a roll mill, a ball mill, or a jet mill.

8. The method of claim 7 , wherein the mixing is performed for 1 hour to 8 hours.

9. The method of claim 1 , wherein the lanthanum precursor comprises any one selected from the group consisting of alkoxides, chlorides, oxides, hydroxides, oxyhydroxides, nitrates, carbonates, acetates, and oxalates which include lanthanum, or a mixture of two or more thereof.

10. The method of claim 1 , wherein the lithium precursor comprises any one selected from the group consisting of lithium chloride (LiCl), lithium carbonate (Li 2 CO 3 ), lithium hydroxide (LiOH), lithium phosphate (Li 3 PO 4 ), and lithium nitrate (LiNO 3 ), or a mixture of two or more thereof.

Assignees

• Lg Chemical Ltd
• Univ Industry Cooperation Group Kyung Hee Univ

Inventors

• Lee Su Hee
• Byun Won Bae
• Im Sang Hyuk
• Park Cheol Hee

Classifications

• C01G23/005

  Alkali titanates · CPC title

• C01P2004/64

  Nanometer sized, i.e. from 1-100 nanometer · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2006/12

  Surface area · CPC title

• H01M10/052

  Li-accumulators · CPC title