Lithium metal oxide nanoparticles and method for preparing them

Patent metadata

Field	Value
Publication number	US-2024359997-A1
Application number	US-202318140949-A
Country	US
Kind code	A1
Filing date	Apr 28, 2023
Priority date	Apr 28, 2023
Publication date	Oct 31, 2024
Grant date	—

Abstract

The present invention relates to lithium metal oxide nanoparticles and a method for preparing the same and provides lithium metal oxide nanoparticles each having a shape of a hexahedron with a square outer cross section or a hexahedron with at least one chamfered corner and comprising a hollow of which a cross section is a square or a square having at least one chamfered corner, and a method for preparing the same, so that the lithium metal oxide nanoparticles can be utilized as an electrode material of a next-generation electronic device in which a contact area between an electrode and an electrolyte is increased to improve the charge and discharge rate characteristics and improve the conductivity.

First claim

What is claimed is:

1 . A lithium metal oxide nanoparticle having a shape of a hexahedron with a square outer cross section or a hexahedron with at least one chamfered corner, and
comprising a hollow of which a cross section is a square or a square having at least one chamfered corner.

2 . The lithium metal oxide nanoparticle according to claim 1 ,
wherein a ratio (a/b) of the length (a) of a side of the outer cross section of the lithium metal oxide nanoparticle to a length (b) of one side of a square cross section of the hollow is 1.2 to 10.

3 . The lithium metal oxide nanoparticle according to claim 1 ,
wherein a thickness of the lithium metal oxide on the hollow is 5 to 200 nm.

4 . The lithium metal oxide nanoparticle according to claim 1 ,
wherein a BET surface area of the lithium metal oxide nanoparticle may be 20 to 200 m 2 /g.

5 . The lithium metal oxide nanoparticle according to claim 1 ,
wherein an outer diameter or a length of the longest side of the lithium metal oxide nanoparticle is 15 to 1,000 nm.

6 . The lithium metal oxide nanoparticle according to claim 1 ,
wherein the lithium metal oxide nanoparticle is made from lithium titanium oxide (LTO).

7 . The lithium metal oxide nanoparticle according to claim 1 ,
wherein the lithium metal oxide nanoparticle is derived from lithium metal oxide that is synthesized from a calcium-containing intermediate having a shape of a hexahedron with a square outer cross section or a hexahedron with at least one chamfered corner and comprises a hollow while the shape of the hexahedron or the hexahedron with at least one chamfered corner is maintained.

8 . A method for preparing lithium metal oxide nanoparticles comprising:
preparing a titanium-containing intermediate having a shape of a hexahedron with a square outer cross section or a hexahedron with at least one chamfered corner; preparing a titanium oxide comprising a hollow by using the titanium-containing intermediate; mixing the titanium oxide with a lithium source in a solvent to obtain a dispersed composition; performing a heat treatment on the composition; and washing, drying, and calcining a reactant obtained after the heat treatment.

9 . The method for preparing lithium metal oxide nanoparticles according to claim 8 ,
wherein the heat treatment on the composition is performed for 5 to 20 hours at a temperature of 150° C. to 200° C.

10 . The method for preparing lithium metal oxide nanoparticles according to claim 8 ,
wherein the calcining is performed for 60 to 180 minutes at a temperature of 800° C. to 1,000° C.

11 . The method for preparing lithium metal oxide nanoparticles according to claim 8 ,
wherein in the mixing, a molar ratio (B/A) of the titanium oxide (A) and the lithium source (B) is 9 to 11.

12 . The method for preparing lithium metal oxide nanoparticles according to claim 8 ,
wherein the preparing of the titanium-containing intermediate comprises: mixing a calcium source, polyalkylene glycol, and a titanium source in a solvent to prepare a second dispersed composition; and performing a heat treatment on the second dispersed composition.

13 . The method for preparing lithium metal oxide nanoparticles according to claim 12 ,
wherein, in the mixing, a molar ratio (D/C) of the calcium source (C) and the titanium source (D) is 1 to 3.

14 . The method for preparing lithium metal oxide nanoparticles according to claim 8 ,
wherein the preparing of the titanium oxide comprising the hollow by using the titanium-containing intermediate comprises: mixing the titanium-containing intermediate and a chelating agent in a solvent to prepare a third dispersed composition; performing a heat treatment on the third dispersed composition; washing a resultant obtained after the heat treatment with a solvent and drying; and calcining the dried resultant to obtain a titanium oxide.

15 . The method for preparing lithium metal oxide nanoparticles according to claim 14 ,
wherein, in the mixing, a molar ratio (F/E) of the titanium-containing intermediate (E) and the chelating agent (F) is 1 to 3.

16 . The method for preparing lithium metal oxide nanoparticles according to claim 14 ,
wherein the chelating agent is one selected from the group consisting of ethylenediaminetetraacetic acid-disodium (EDTA-2Na), EDTA-3Na, EDTA-4Na, and EDTA-4H.

17 . The method for preparing lithium metal oxide nanoparticles according to claim 14 ,
wherein the heat treatment on the third dispersed composition is performed for 5 to 20 hours at a temperature of 150° C. to 200° C.

18 . The method for preparing lithium metal oxide nanoparticles according to claim 14 ,
wherein the calcining of the dried resultant to obtain a titanium oxide is performed for 60 to 180 minutes at 300° C. to 500° C.

19 . An electrode for an electronic device comprising:
the lithium metal oxide nanoparticle according to claim 1 .

Assignees

• Korea Inst Energy Res
• Ct Advanced Meta Mat

Inventors

• Kim Hyun Uk
• Han Seong Ok
• Kim Tae Woo
• Byun Se Gi
• Yoo Jung Joon
• Subiyanto Iyan
• Lee Hak Joo

Classifications

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2006/12

  Surface area · CPC title

• C01P2004/38

  cube-like · CPC title