Cobalt oxide for lithium secondary battery, preparing method thereof, lithium cobalt oxide formed from the cobalt oxide, and lithium secondary battery having positive electrode including the lithium cobalt oxide

Patent metadata

Field	Value
Publication number	US-10892484-B2
Application number	US-201715702048-A
Country	US
Kind code	B2
Filing date	Sep 12, 2017
Priority date	Sep 13, 2016
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

A cobalt oxide for a lithium secondary battery, a method of preparing the cobalt oxide; a lithium cobalt oxide for a lithium secondary battery formed from the cobalt oxide; and a lithium secondary battery having a positive electrode including the lithium cobalt oxide, the cobalt oxide having a tap density of about 2.8 g/cc to about 3.0 g/cc, and an intensity ratio of about 0.8 to about 1.2 of a second peak at 2θ of about 31.3±1° to a first peak at 2θ of about 19±1° in X-ray diffraction spectra, as analyzed by X-ray diffraction.

First claim

What is claimed is:

1. A method of preparing Co 3 O 4 that has an average particle diameter (D50) of about 15 μm to about 18 μm, a particle diameter (D90) of about 23 μm to about 25 μm, and a particle diameter (D10) of about 5 μm to about 7 μm, the method consisting essentially of:
performing a precipitation reaction of a mixture including a cobalt precursor and a precipitant, the precipitation reaction being carried out under an oxidizing gas atmosphere to obtain the Co 3 O 4 ,
wherein the precipitation reaction of the mixture is performed at a pH of about 11.0 to about 12.0 and a temperature of 70° C. to 80° C., and
wherein the Co 3 O 4 is not thermal-treated.

2. The method as claimed in claim 1 , further comprising washing and sieving a reaction product after the reacting under the oxidizing gas atmosphere.

3. The method as claimed in claim 1 , wherein the cobalt precursor is cobalt sulfate.

4. The method as claimed in claim 1 , wherein the precipitation reaction of the mixture is performed at a pH of 11.5 to 12.0.

5. A Co 3 O 4 for a lithium secondary battery, the Co 3 O 4 being prepared according to the method as claimed in claim 1 and having:
a tap density of about 2.8 g/cc to about 3.0 g/cc, and
an intensity ratio of about 0.8 to about 1.2 of a second peak at 2θ of about 31.3±1° to a first peak at 2θ of about 19±1° in X-ray diffraction spectra, as analyzed by X-ray diffraction.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Park Junseok
• Kwon Seonyoung
• Kim Jihyun
• Kim Jinhwa
• Park Dohyung
• Lee Daehoe

Classifications

• H01M4/52

  of nickel, cobalt or iron · CPC title

• H01M10/0525

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

• C01P2004/51

  Particles with a specific particle size distribution · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• C01P2004/32

  Spheres · CPC title