Positive Electrode Active Material for Secondary Battery and Lithium Secondary Battery Including the Same

Patent metadata

Field	Value
Publication number	US-2025210652-A1
Application number	US-202519047280-A
Country	US
Kind code	A1
Filing date	Feb 6, 2025
Priority date	Feb 1, 2019
Publication date	Jun 26, 2025
Grant date	—

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 2: [Equation 2] Δ size (| crystallite size IB -crystallite size FWHM |) ≤20, 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

1 . A positive electrode active material for a secondary battery, comprising:
a lithium composite transition metal oxide comprising nickel (Ni), 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 of claim 1 , wherein the lithium composite transition metal oxide further comprises at least one of cobalt (Co), manganese (Mn), or aluminum (Al).

3 . The positive electrode active material of claim 1 , 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.

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

5 . The positive electrode active material of claim 1 , wherein the Δ size (|crystallite size IB -crystallite size FWHM |) in Equation 2 is 17 or less.

6 . The positive electrode active material of claim 1 , wherein the Δ size (|crystallite size IB -crystallite size FWHM |) in Equation 2 is 16 or less.

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

8 . A lithium secondary battery comprising the positive electrode of claim 7 .

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