Porous Co3O4 nanoparticles and method for preparing the same

Patent metadata

Field	Value
Publication number	US-11465913-B2
Application number	US-202016865482-A
Country	US
Kind code	B2
Filing date	May 4, 2020
Priority date	May 20, 2019
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

The disclosure relates to porous Co3O4 nanoparticles which include flocculated amorphous primary nanoparticles, with air pores formed between the amorphous primary nanoparticles. The porous Co3O4 nanoparticles, according to an embodiment of the disclosure, may be in the form of flocculated amorphous primary nanoparticles of 1 nm or less, have a 400 times larger specific surface area than the conventional Co3O4 particles, and address the issue with the expansion of Co3O4 lattices which may arise when the battery is charged or discharged, thereby providing more reliability when applied to batteries.

First claim

What is claimed is:

1. Porous Co 3 O 4 nanoparticles configured in a form of flocculated amorphous primary nanoparticles represented as chemical formula 1, wherein air pores are formed between the amorphous primary nanoparticles, wherein
Co 3 O 4 −x  [Chemical formula 1]

wherein 0≤x≤0.4.

2. The porous Co 3 O 4 nanoparticles of claim 1 , wherein
the amorphous primary nanoparticles have a size ranging from 0.3 nm to 3 nm.

3. The porous Co 3 O 4 nanoparticles of claim 1 , wherein
the porous Co 3 O 4 nanoparticles have a porosity ranging from 20% to 50%.

4. The porous Co 3 O 4 nanoparticles of claim 1 , wherein
the air pores have a size ranging from 0.4 nm to 5 nm.

5. The porous Co 3 O 4 nanoparticles of claim 1 , wherein
the porous Co 3 O 4 nanoparticles have a BET specific surface area ranging from 40 m 2 /g to 120 m 2 /g.

6. Porous Co 3 O 4 nanoparticles prepared by forming primary nanoparticles in such a manner as to separate Co clusters by injecting positive ions into lattices of crystalline Co 3 O 4 particles while simultaneously allowing the primary nanoparticles to transition to an amorphous phase, wherein
the porous Co 3 O 4 nanoparticles are configured in a form of flocculated amorphous primary nanoparticles represented as chemical formula 1, wherein
Co 3 O 4 −x  [Chemical formula 1]

wherein 0≤x≤0.4.

7. The porous Co 3 O 4 nanoparticles of claim 6 , wherein
the positive ions are positive ions of an alkaline metal or an alkaline earth metal.

8. The porous Co 3 O 4 nanoparticles of claim 6 , wherein
the positive ions are injected using a constant current or constant voltage method.

Assignees

• Univ Yonsei Iacf

Inventors

• Jeong Hyung Mo
• Lee Kyu Hyoung

Classifications

• C01P2004/64

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

• C01P2006/12

  Surface area · CPC title

• C01G51/04 Primary

  Oxides · CPC title

• C01P2004/50

  Agglomerated particles · CPC title

• C01P2004/04

  obtained by TEM, STEM, STM or AFM · CPC title