Positive electrode active material for rechargeable lithium battery and rechargeable lithium battery

Patent metadata

Field	Value
Publication number	US-2023327101-A1
Application number	US-202217989547-A
Country	US
Kind code	A1
Filing date	Nov 17, 2022
Priority date	Mar 23, 2022
Publication date	Oct 12, 2023
Grant date	—

Abstract

A positive electrode active material for a rechargeable lithium battery, and a rechargeable lithium battery including the same are provided. The positive electrode active material includes a lithium nickel-based composite oxide wherein the positive electrode active material is in a form of secondary particles in which a plurality of primary particles are aggregated and at least a portion of the primary particles are radially arranged, in a cross-section of the secondary particles, a number ratio of the primary particles having a cross-sectional area of less than about 0.1 µm 2 is greater than or equal to about 65%, and a full width at half maximum (FWHM) of the peak corresponding to the (003) plane in the X-ray diffraction analysis for the positive electrode active material is less than or equal to about 0.125.

First claim

What is claimed is:

1 . A positive electrode active material for a rechargeable lithium battery, the positive electrode active material comprising: a lithium nickel-based composite oxide,
wherein the positive electrode active material is in a form of secondary particles comprising a secondary particle in which a plurality of primary particles are aggregated and at least a portion of the primary particles are radially arranged, in a cross-section of the secondary particle, a number ratio of the primary particles having a cross-sectional area of less than about 0.1 µm 2 is greater than or equal to about 65%, based on a total number of the primary particles, and a full width at half maximum (FWHM) of a peak corresponding to the (003) plane in an X-ray diffraction analysis for the positive electrode active material is less than or equal to about 0.125.

2 . The positive electrode active material of claim 1 , wherein
in the cross-section of the secondary particle, the number ratio of the primary particles having a cross-sectional area of less than about 0.1 µm 2 is about 65% to about 90%.

3 . The positive electrode active material of claim 1 , wherein
in the cross-section of the secondary particle, a number ratio of the primary particles having a cross-sectional area of greater than about 0.3 µm 2 is less than or equal to about 5%, based on the total number of the primary particles.

4 . The positive electrode active material of claim 1 , wherein
in the cross-section of the secondary particle, a number ratio of the primary particles having a cross-sectional area of about 0.1 µm 2 to about 0.3 µm 2 is about 5% to about 30%, based on the total number of the primary particles.

5 . The positive electrode active material of claim 1 , wherein
the full width at half maximum of the peak corresponding to the (003) plane in the X-ray diffraction analysis for the positive electrode active material is about 0.100 to about 0.125.

6 . The positive electrode active material of claim 1 , wherein
the secondary particles each comprise an inner portion in which primary particles and pores are irregularly arranged, and an outer portion in which at least a portion of the primary particles are radially arranged, and wherein the outer portion is a region around the inner portion.

7 . The positive electrode active material of claim 1 , wherein
an average particle diameter (D50) of the secondary particles is about 5 µm to about 20 µm.

8 . The positive electrode active material of claim 1 , wherein
the lithium nickel-based composite oxide is represented by Chemical Formula 1:

wherein, in Chemical Formula 1, 0.9≤a1≤1.8, 0.3≤x1≤1, 0≤y1≤0.7, and 0≤z≤0.1, M 1 and M 2 are each independently at least one element selected from Al, B, Ba, Ca, Ce, Co, Cr, Fe, Mg, Mn, Mo, Nb, Si, Sr, Ti, V, W, and Zr, and X is at least one element selected from F, P, and S.

9 . A positive electrode for a rechargeable lithium battery, the positive electrode comprising:
the positive electrode active material of claim 1 ; and a current collector supporting the positive electrode active material.

10 . A rechargeable lithium battery, comprising
a positive electrode comprising the positive electrode active material of claim 1 , a negative electrode, and an electrolyte.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Yun Pilsang
• Kim Hyunbeom
• Lee Hanseul
• Kim Do-Yu
• You Yongchan

Classifications

• C01G53/82 Primary

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

• C01G53/42

  containing alkali metals, e.g. LiNiO2 · CPC title

• H01M4/131

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

• H01M2004/028

  Positive electrodes · CPC title