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-2018076454-A1
Application number	US-201715702048-A
Country	US
Kind code	A1
Filing date	Sep 12, 2017
Priority date	Sep 13, 2016
Publication date	Mar 15, 2018
Grant date	—

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 cobalt oxide for a lithium secondary battery, 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.

2 . The cobalt oxide as claimed in claim 1 , wherein the cobalt oxide 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.

3 . A method of preparing the cobalt oxide for a lithium secondary battery as claimed in claim 1 , the method comprising:
performing a precipitation reaction of a mixture including a cobalt precursor and a precipitant, and the precipitation reaction is carried out under an oxidizing gas atmosphere to obtain the cobalt oxide.

4 . The method as claimed in claim 3 , further comprising washing and sieving a reaction product after the reacting under the oxidizing gas atmosphere.

5 . The method as claimed in claim 3 , wherein the precipitation reaction of the mixture is performed at a pH of about 11.0 to about 12.0 and a temperature of about 60° C. to about 80° C.

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

7 . A lithium cobalt oxide for a lithium secondary battery, the lithium cobalt oxide being represented by Formula 1 and having:
a spherical particle shape, a pellet density of about 3.98 g/cc to about 4.2 g/cc, an average particle diameter (D50) of about 23 μm to about 28 μm, a particle diameter (D90) of about 35 μm to about 45 μm, and a particle diameter (D10) of about 10 μm to about 13 μm:
Li a Co b O c   [Formula 1]

wherein, in Formula 1, 0.9≦a≦1.1, 0.98≦b≦1.00, and 1.9≦c≦2.1.

8 . The lithium cobalt oxide as claimed in claim 7 , further comprising at least one selected from magnesium (Mg), calcium (Ca), strontium (Sr), titanium (Ti), zirconium (Zr), boron (B), aluminum (Al), and fluorine (F).

9 . A lithium secondary battery comprising a positive electrode that includes the lithium cobalt oxide as claimed in claim 7 .

10 . The lithium secondary battery as claimed in claim 9 , wherein the positive electrode has a density of about 4.05 g/cc to about 4.15 g/cc.

Assignees

• Samsung Sdi Co Ltd

Inventors

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

Classifications

• C01P2006/11

  Powder tap density · CPC title

• H01M10/052

  Li-accumulators · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• H01M4/523

  for non-aqueous cells (H01M4/525 takes precedence) · CPC title

• C01G51/04 Primary

  Oxides · CPC title