Method of preparing positive electrode active material for lithium secondary battery and positive electrode active material prepared thereby

Patent metadata

Field	Value
Publication number	US-12528713-B2
Application number	US-202218573109-A
Country	US
Kind code	B2
Filing date	Nov 2, 2022
Priority date	Nov 24, 2021
Publication date	Jan 20, 2026
Grant date	Jan 20, 2026

Abstract

A method of preparing a positive electrode active material for a lithium secondary battery and a positive electrode active material prepared thereby. T the preparation method includes a first step of preparing a lithium transition metal oxide by mixing a lithium raw material and a transition metal precursor containing 70 mol % or more of nickel based on the total number of moles of transition metals and sintering the mixture; and a second step of washing the lithium transition metal oxide with hot water of more than 90° C., wherein, after the second step, a result of EELS analysis of a particle surface of the lithium transition metal oxide satisfies Equation 1.

First claim

The invention claimed is:

1 . A method of preparing a positive electrode active material for a lithium secondary battery, comprising:
preparing a lithium transition metal oxide by mixing a lithium raw material and a transition metal precursor containing 70 mol % or more of nickel based on a total number of moles of transition metals to form a mixture, and sintering the mixture to form the lithium transition metal oxide; and washing the lithium transition metal oxide with hot water of 95° C. or higher and 130° C. or lower, wherein the sintering is performed at 750° C. to 830° C., wherein the washing is performed for 10 minutes to 30 minutes, wherein the lithium metal oxide is represented by a following Formula 1:
Li a [Ni b Co c Mn d Q e ]O 2+f   (1), wherein

1.0≤a≤1.2, 0.7<b<1.0, 0<c≤0.15, 0<d≤0.15, 0≤e≤0.05,b+c+d+e=1.0, −0.1≤f≤1.0, and
Q is at least one of W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, or Mo, and
wherein, immediately after the washing and a subsequent drying of the lithium transition metal oxide, a result of EELS analysis of a particle surface of the lithium transition metal oxide satisfies a following Equation 1:
1≤I(853 eV)/I(855.5 eV)≤1.89  (1), wherein

I (853 eV) is a peak intensity appearing near 853 eV, and
I (855.5 eV) is a peak intensity appearing near 855.5 eV.

2 . The method of claim 1 , wherein more Ni 2+ than Ni 3+ is contained on the particle surface of the lithium transition metal oxide after the washing.

3 . The method of claim 1 , wherein a weight of the hot water used in the washing is from 1 to 3 times a weight of the lithium transition metal oxide.

Assignees

• Lg Energy Solution Ltd

Inventors

• Lho Eun Sol
• Han Gi Beom
• Kim Jong Woo
• Jung Wang Mo
• Park Sang Min
• Lee Sang Wook
• Kim Seul Ki
• Kim Hyeong Il

Classifications

• H01M4/505

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

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M10/052 Primary

  Li-accumulators · CPC title

• H01M4/525

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