Preparation of nanosized cubic lithium lanthanum zirconate fast ion conductor via facile polymer-chelate combustion route

Patent metadata

Field	Value
Publication number	US-10858263-B2
Application number	US-201816009518-A
Country	US
Kind code	B2
Filing date	Jun 15, 2018
Priority date	Jun 16, 2017
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

Nanosized cubic lithium lanthanum zirconate is synthesized by forming a solution including an organic compound and compounds of lithium, lanthanum, and zirconium; drying the solution to yield a solid; and heating the solid in the presence of oxygen to pyrolyze the organic compound to yield a product comprising nanosized cubic lithium lanthanum zirconate.

First claim

What is claimed is:

1. A method of synthesizing undoped cubic lithium lanthanum zirconate nanoparticles, the method comprising:
forming a solution comprising tannic acid and compounds of lithium, lanthanum, and zirconium;
drying the solution to yield a solid; and
heating the solid in the presence of oxygen to pyrolyze the tannic acid, thereby yielding a product comprising cubic lithium lanthanum zirconate nanoparticles.

2. The method of claim 1 , wherein heating the solid comprises calcining the solid.

3. The method of claim 1 , wherein the solution comprises lithium, lanthanum, and zirconium in a molar ratio of about 10:3:2.

4. The method of claim 1 , wherein the solution comprises lithium, lanthanum, and zirconium in a molar ratio of about 10.5:3:2.

5. The method of claim 1 , wherein the compounds of lithium, lanthanum, and zirconium are nitrate salts.

6. The method of claim 1 , wherein the compounds of lithium, lanthanum, and zirconium include organic moieties.

7. The method of claim 6 , wherein the compounds of lithium, lanthanum, and zirconium include acetylacetonate.

8. The method of claim 1 , wherein the solution is aqueous.

9. The method of claim 1 , wherein the solution is non-aqueous.

10. The method of claim 1 , wherein the solution comprises an organic solvent.

11. The method of claim 10 , wherein the solution comprises propionic acid.

12. The method of claim 10 , wherein the solution comprises dichloromethane.

13. The method of claim 1 , wherein the product comprises at least 90 wt % cubic lithium lanthanum zirconate nanoparticles.

14. The method of claim 1 , wherein the product comprises a total amount of lanthanum zirconate, lanthanum oxide, and lithium zirconate of less than 5 wt %.

15. The method of claim 1 , wherein the product comprises less than 5 wt % of tetragonal lithium lanthanum zirconate.

16. The method of claim 1 , wherein heating the solid comprises forming a carbonaceous foam comprising the tannic acid or a degradation product thereof, thereby restricting growth of the cubic lithium lanthanum zirconate nanoparticles.

17. The method of claim 1 , wherein the cubic lithium lanthanum zirconate nanoparticles are undoped.

Assignees

• Weller Jon Mark
• Chan Candace
• Univ Arizona State

Inventors

• Weller Jon Mark
• Chan Candace

Classifications

• H01M10/0562

  Solid materials · CPC title

• H01M2300/0071

  Oxides · CPC title

• C01P2002/52

  containing elements as dopants · CPC title

• C01G25/006 Primary

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

• C01P2006/40

  Electric properties · CPC title