High-nickel positive electrode active material, producing method thereof, positive electrode and lithium secondary battery comprising the same

Patent metadata

Field	Value
Publication number	US-11581535-B2
Application number	US-201916701621-A
Country	US
Kind code	B2
Filing date	Dec 3, 2019
Priority date	Dec 10, 2018
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

A method for producing a positive electrode active material, a positive electrode active material produced thereby, and a positive electrode and a lithium secondary battery including the same are provided. The method includes preparing a nickel-manganese-aluminum precursor having an atomic fraction of nickel of 90 atm % or greater in all transition metals, and mixing the nickel-manganese-aluminum precursor, a cobalt raw material, and a lithium raw material and heat treating the mixture.

First claim

The invention claimed is:

1. A method for producing a positive electrode active material, comprising:
preparing a nickel-manganese-aluminum precursor having an atomic fraction of nickel of 90 atm % or greater in all transition metals of the nickel-manganese-aluminum precursor; and
mixing the nickel-manganese-aluminum precursor, a cobalt raw material, and a lithium raw material to obtain a mixture; and
heat treating the mixture.

2. The method of claim 1 , wherein the nickel-manganese-aluminum precursor does not contain cobalt.

3. The method of claim 1 , wherein the nickel-manganese-aluminum precursor is represented by either Formula 1 below or Formula 2 below:
Ni a1 Mn b1 Al c1 M d1 O⋅OH  [Formula 1]

in Formula 1, M is one or more selected from the group consisting of W, Cu, Fe, Ba, V, Cr, Ti, Zr, Zn, In, Ta, Y, In, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo, and 0.90≤a1≤0.98, 0.01≤b1<0.1, 0.01≤c1<0.1, and 0≤d1≤0.02,
Ni a2 Mn b2 Al c2 M d2 (OH) 2   [Formula 2]

in Formula 2, M is one or more selected from the group consisting of W, Cu, Fe, Ba, V, Cr, Ti, Zr, Zn, In, Ta, Y, In, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo, and 0.90≤a2≤0.98, 0.01≤b2<0.1, 0.01≤c2<0.1, and 0≤d2≤0.02.

4. The method of claim 1 , wherein the cobalt raw material is mixed in an amount, wherein a content of cobalt in the positive electrode active material is 4000-7000 ppm.

5. The method of claim 1 , wherein the heat treatment is performed at 730° C. to 780° C. for 6 to 18 hours.

6. The method of claim 3 , wherein in Formulas 1 and 2, the M is a doping element.

Assignees

• Lg Chemical Ltd
• Lg Energy Solution Ltd

Inventors

• Hwang Jin Tae
• Lee Dong Hun
• Park Sung Bin
• Cho Hyung Man
• Han Jung Min
• Jung Wang Mo

Classifications

• 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

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M4/485 Primary

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M10/052

  Li-accumulators · CPC title

• C01P2006/40

  Electric properties · CPC title