Cathode active material precursor and lithium secondary battery utilizing same

Patent metadata

Field	Value
Publication number	US-12512468-B2
Application number	US-201917041959-A
Country	US
Kind code	B2
Filing date	Mar 28, 2019
Priority date	Mar 28, 2018
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

Abstract

A cathode active material precursor according to embodiments of the present invention includes nickel (Ni) and cobalt (Co) and includes an excess amount of Ni. A101/A001 is 1 or more and I101/I001 is 1 or more. A101 is a peak area of (101) plane, and A001 is a peak area of (001) plane by an X-ray diffraction (XRD) analysis, and I101 is a peak intensity of (101) plane, and I001 is a peak intensity of (001) plane by the XRD analysis. A cathode and a lithium secondary battery having improved crystallinity and long-term stability using the cathode active material precursor.

First claim

What is claimed is:

1 . A cathode active material precursor comprising Chemical Formula 1,
Ni 1−x−y−z Co x Mn y M z (OH) 2+a   [Chemical Formula 1]
wherein 0.02≤x≤0.15, 0<y≤0.15, 0≤z≤0.1, 0.75≤1−x−y−z≤0.95, −0.5≤a≤0.1, and M includes at least one of Mg, Sr, Ba, B, Al, Si, Mn, Ti, Zr or W, wherein A 101 /A 001 is 1 or more and I 101 /I 001 is 1 or more, and A 101 is a peak area of (101) plane and A 001 is a peak area of (001) plane by an X-ray diffraction (XRD) analysis, and I 101 is a peak intensity of (101) plane and I 001 is a peak intensity of (001) plane by the XRD analysis.

2 . The cathode active material precursor according to claim 1 , wherein A 101 /A 001 is in a range from 1 to 2.

3 . The cathode active material precursor according to claim 1 , wherein I 101 /I 001 is in a range from 1 to 2.

4 . The cathode active material precursor according to claim 1 , wherein a molar content of Co is greater than a molar content of Mn.

5 . A cathode active material obtained from the cathode active material precursor according to claim 1 .

6 . The cathode active material according to claim 5 , wherein the cathode active material is represented by Chemical Formula 2:
Li 1+b Ni 1−x−y−z Co x Mn y M z O 2+c   [Chemical Formula 2]
wherein, in Chemical Formula 2, −0.05≤b≤0.15, 0.02≤x≤0.15, 0<y≤0.15, 0≤z≤0.1, −0.5≤c≤0.1, and M includes at least one of Mg, Sr, Ba, B, Al, Si, Mn, Ti, Zr or W.

7 . The cathode active material according to claim 5 , wherein a length of a major axis of a primary particle is 1.5 to 7 times a length of a minor axis of the primary particle.

8 . A lithium secondary battery comprising:
a cathode including a cathode active material obtained from the cathode active material precursor according to claim 1 ; an anode; and a separation layer disposed between the cathode and the negative anode.

Assignees

• Sk Innovation Co Ltd
• Sk On Co Ltd

Inventors

• Noh Mi Jung
• Kim Jik Soo
• Kim Sang Bok
• Ha Dong Wook

Classifications

• C01G53/82 Primary

  Compounds containing nickel, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/0525

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

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title