Precursor of a cathode active material for a lithium secondary battery, cathode active material, method for manufacturing the cathode active material, and lithium secondary battery including the cathode active material

Patent metadata

Field	Value
Publication number	US-9543571-B2
Application number	US-201214347420-A
Country	US
Kind code	B2
Filing date	Sep 18, 2012
Priority date	Sep 26, 2011
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

Disclosed are a precursor for a rechargeable lithium battery, a positive active material including the same, a preparation method thereof, and a rechargeable lithium battery including the positive active material. More particularly, the present invention relates to a precursor including a sheet-shaped plate having a thickness of about 1 nm to about 30 nm and that is represented by the following Chemical Formula 1.

Ni x Co y Mn 1-x-y-z M z (OH) 2   [Chemical Formula 1]

In the above Chemical Formula 1,
0<x<1, 0≦y<1, 0.5≦1-x-y-z, and 0≦z<1,

and M is at least one kind of metal selected from the group consisting of Al, Mg, Fe, Cu, Zn, Cr, Ag, Ca, Na, K, In, Ga, Ge, V, Mo, Nb, Si, Ti, and Zr.

First claim

What is claimed is:

1. A positive active material precursor for a rechargeable lithium battery comprising a sheet-shaped plate having a thickness of 1 nm to 30 nm, and
being represented by the following Chemical Formula 1:
Ni x Co y Mn 1-x-y-z M z (OH) 2   [Chemical Formula 1]

wherein, in the above Chemical Formula 1,
0<x<1, 0<y<1, 0.65≦1-x-y-z, and 0≦z<1, and
M is at least one kind of metal selected from the group consisting of Al, Mg, Fe, Cu, Zn, Cr, Ag, Ca, Na, K, In, Ga, Ge, V, Mo, Nb, Si, Ti, and Zr, and
wherein the positive active material precursor has an average particle size of 25 μm to 40 μm.

2. The positive active material precursor for a rechargeable lithium battery of claim 1 , wherein the positive active material precursor for a rechargeable lithium battery is selected from the group consisting of Ni 0.2 Co 0.1 Mn 0.7 (OH) 2 , Ni 0.25 Co 0.05 Mn 0.7 (OH) 2 , and Ni 0.2 Co 0.1 Al 0.05 Mn 0.65 (OH) 2 .

Assignees

• Korea Electronics Technology

Inventors

• Song Jun Ho
• Kim Young Jun
• Kim Jeom-Soo
• Cho Woo Suk
• Kim Jae-Hun
• Lee Jun Sung
• Kim Jin Hwa
• Lee Kyoung Joon

Classifications

• C01P2004/32

  Spheres · CPC title

• C01P2004/64

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

• C01P2002/52

  containing elements as dopants · CPC title

• H01M4/54

  of silver · 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