Positive electrode active material for secondary battery and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-12255330-B2
Application number	US-202418420436-A
Country	US
Kind code	B2
Filing date	Jan 23, 2024
Priority date	Feb 1, 2019
Publication date	Mar 18, 2025
Grant date	Mar 18, 2025

Abstract

A positive electrode active material for a secondary battery which includes a nickel-based lithium composite transition metal oxide including nickel (Ni), wherein the lithium composite transition metal oxide satisfies Equation 1 and Equation 2 below

80 nm≤crystallite size FWHM ≤150 nm  [Equation 1]

Δ size(|crystallite size IB −crystallite size FWHM |)≤20  [Equation 2]
wherein, in Equation 1 and Equation 2, crystallite size FWHM is a crystallite size obtained by calculating from X-ray diffraction (XRD) data using a full width at half maximum (FWHM) method, and crystallite size IB is a crystallite size obtained by calculating from XRD data using an integral breadth (IB) method.

First claim

The invention claimed is:

1. A positive electrode active material for a secondary battery, comprising:
a lithium composite transition metal oxide comprising nickel (Ni), and at least one of cobalt (Co), manganese (Mn), or aluminum (Al),
wherein the nickel (Ni) among metals excluding lithium of the lithium composite transition metal oxide is included in an amount of 60 mol % or more, and
wherein the lithium composite transition metal oxide satisfies Equation 2:
Δ size(|crystallite size IB −crystallite size FWHM |)≤20  [Equation 2]

wherein, crystallite size FWHM is a crystallite size obtained by calculating from X-ray diffraction (XRD) data using a full width at half maximum (FWHM) method, and crystallite size IB is a crystallite size obtained by calculating from XRD data using an integral breadth (IB) method.

2. The positive electrode active material for a secondary battery of claim 1 , wherein a particle of the lithium composite transition metal oxide is a secondary particle in which primary particles are aggregated.

3. The positive electrode active material for a secondary battery of claim 1 , wherein the lithium composite transition metal oxide is represented by Formula 1:
Li a Ni 1−(x+y+z) Co x M′ y M″ z O 2+δ   [Formula 1]

wherein, in Formula 1, M′ is at least one selected from the group consisting of Mn and Al, M″ is at least one selected from the group consisting of barium (Ba), calcium (Ca), zirconium (Zr), titanium (Ti), magnesium (Mg), tantalum (Ta), niobium (Nb), and molybdenum (Mo), 1.0≤a≤1.5, x<y, 0≤z≤0.1, 0.1≤x+y+z≤0.4, and 0≤δ≤1.0.

4. The positive electrode active material for a secondary battery of claim 1 , wherein the Δ size(|crystallite size IB −crystallite size FWHM |) in Equation 2 is 17 or less.

5. A positive electrode for a secondary battery, the positive electrode comprising the positive electrode active material of claim 1 .

6. A lithium secondary battery comprising the positive electrode of claim 5 .

7. The positive electrode active material for a secondary battery of claim 1 , wherein the lithium composite transition metal oxide satisfies Equation 1:
80 nm≤crystallite size FWHM ≤150 nm  [Equation 1]

wherein, crystallite size FWHM is a crystallite size obtained by calculating from X-ray diffraction (XRD) data using a full width at half maximum (FWHM) method, and crystallite size IB is a crystallite size obtained by calculating from XRD data using an integral breadth (IB) method.

8. The positive electrode active material for a secondary battery of claim 7 , wherein the crystallite size FWHM in Equation 1 is in a range of 130 nm to 132 nm.

Assignees

• Lg Energy Solution Ltd

Inventors

• Baek So Ra
• Lho Eun Sol
• Jung Wang Mo
• Lee Sang Wook
• Jo Eun

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/485

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

• H01M4/505

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