Lithium cobalt oxide for a lithium secondary battery and lithium secondary battery comprising positive electrode including the same

Patent metadata

Field	Value
Publication number	US-11482704-B2
Application number	US-202117144381-A
Country	US
Kind code	B2
Filing date	Jan 8, 2021
Priority date	Sep 13, 2016
Publication date	Oct 25, 2022
Grant date	Oct 25, 2022

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 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.

2. The lithium cobalt oxide as claimed in claim 1 , further comprising at least one selected from magnesium (Mg), calcium (Ca), strontium (Sr), titanium (Ti), zirconium (Zr), boron (B), aluminum (Al), and fluorine (F).

3. A lithium secondary battery comprising a positive electrode that includes the lithium cobalt oxide as claimed in claim 1 .

4. The lithium secondary battery as claimed in claim 3 , 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

• C01P2004/03

  obtained by SEM · CPC title

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• C01P2006/11

  Powder tap density · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• C01P2002/74

  by peak-intensities or a ratio thereof only · CPC title