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

Patent metadata

Field	Value
Publication number	US-2025223192-A1
Application number	US-202318853624-A
Country	US
Kind code	A1
Filing date	Apr 7, 2023
Priority date	Apr 7, 2022
Publication date	Jul 10, 2025
Grant date	—

Abstract

A positive electrode active material includes a lithium composite metal oxide including nickel, cobalt, manganese, and aluminum. The positive electrode active material includes 85 mol % to 97 mol % of nickel, and 2 mol % to 5 mol % of cobalt, with respect to the total number of moles of metals other than lithium, and satisfies Expression (1): 0.25≤I 550 /I 700 ≤0.4. In Expression (1), I 700 and I 550 are respectively a maximum value of a peak intensity appearing in a range of 600 ppm to 800 ppm and a maximum value of a peak intensity appearing in a range of 450 ppm to 650 ppm when a spectral analysis (peak deconvolution) is performed on a 1 D NMR center band spectrum extracted from a 2D 7 Li Magic Angle Turning Phase Adjusted Spinning Sideband (MATPASS) NMR spectrum. A positive electrode and a lithium secondary battery are also included

First claim

1 . A positive electrode active material comprising a lithium composite transition metal oxide including nickel, cobalt, manganese, and aluminum,
wherein the positive electrode active material includes 85 mol % to 97 mol % of nickel and 2 mol % to 5 mol % of cobalt, with respect to a total number of moles of metals other than lithium, and satisfies Expression (1) below,

0.25
≤

I
550

/

I
700

≤
0.4

Expression
⁢

(
1
)

where, I 700 and I 550 are respectively a maximum value of a peak intensity appearing in a range of 600 ppm to 800 ppm and a maximum value of a peak intensity appearing in a range of 450 ppm to 650 ppm when a spectral analysis is performed on a 1D NMR center band spectrum extracted from a 2D 7 Li Magic Angle Turning Phase Adjusted Spinning Sideband NMR spectrum of the positive electrode active material.

2 . The positive electrode active material of claim 1 ,
wherein the 1D NMR center band spectrum has a first peak appearing in a range of 550 ppm to 850 ppm, and a second peak appearing in a range of −10 ppm to 10 ppm.

3 . The positive electrode active material of claim 1 ,
wherein the positive electrode active material satisfies Expression (1-1):

0.3
≤

I
550

/

I
700

≤
0.4

Expression
⁢

(

1
-
1

)

4 . The positive electrode active material of claim 1 ,
wherein a full width at half maximum (FWHM 700 ) of the peak appearing in the range of 600 ppm to 800 ppm is 250 ppm or less.

5 . The positive electrode active material of claim 1 ,
wherein a full width at half maximum (FWHM 550 ) of a peak appearing in a range of 450 ppm to 650 ppm is 250 ppm or less.

6 . The positive electrode active material of claim 1 ,
wherein a full width at half maximum (FWHM 0 ) of a peak appearing in a range of −10 ppm to 10 ppm is 50 ppm or less.

7 . The positive electrode active material of claim 1 ,
wherein the positive electrode active material includes the nickel in an amount ranging from 85 mol % to 95 mol % with respect to the total number of moles of metals other than lithium.

8 . The positive electrode active material of claim 1 ,
wherein the positive electrode active material includes the nickel in an amount ranging from 90 mol % to 95 mol % with respect to the total number of moles of metals other than lithium.

9 . The positive electrode active material of claim 1 ,
wherein the positive electrode active material includes the manganese in an amount ranging from 0.5 mol % to 5 mol %, and the aluminum in an amount ranging from 0.5 mol % to 5 mol %, with respect to the total number of moles of metals other than lithium.

10 . The positive electrode active material of claim 1 ,
wherein the positive electrode active material has a composition represented by [Formula 1]: [Formula 1]
Li a Ni b Co c Mn d Al c M 1 f O 2
where in , M 1 is at least one selected from the group consisting of Zr, W, Y, Ba, Ca, Ti, Mg, Ta, and Nb, and wherein 0.8≤a≤1.2, 0.85≤b≤0.97, 0.02≤c≤0.05, 0.005≤d<0.05, 0.005Se<0.05, and 0≤f≤0.02.

11 . A method of preparing a positive electrode active material, the method comprising:
a first step of performing a co-precipitation reaction on a transition metal aqueous solution containing nickel ions, cobalt ions, and manganese ions to form a precursor; a second step of mixing the precursor, a lithium raw material, and an aluminum raw material and then calcining a resultant mixture to form a lithium composite transition metal oxide; and a third step of mixing the lithium composite metal oxide and a cobalt raw material, and then performing a heat treatment to prepare the positive electrode active material.

12 . The method of claim 11 ,
wherein a ratio of a number of moles of cobalt included the cobalt raw material in the third step to a number of moles of cobalt included in the precursor in the first step ranges from 1 to 1.5.

13 . The method of claim 11 ,
wherein a temperature of the heat treatment in the third step is from 600° C. to 750° C.

14 . A positive electrode comprising the positive electrode active material of claim 1 .

15 . A lithium secondary battery comprising the positive electrode of claim 14 .

Assignees

• Lg Energy Solution Ltd

Inventors

• Kim Gun Woo
• Park Cheol Hee
• Hur Hyuck
• Baek So Ra
• Kim Dong Hwi
• Park Kang Joon
• Jung Wang Mo
• Park Sin Young

Classifications

• C01P2002/86

  by NMR- or ESR-data · CPC title

• C01P2002/52

  containing elements as dopants · CPC title

• C01G53/506 Primary

  with the molar ratio of nickel with respect to all the metals other than alkali metals higher than or equal to 0.8, e.g. Li(MzNixCoyMn1-x-y-z)O2 with x ≥ 0.8 · CPC title

• C01G53/42 Primary

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

• H01M2004/028

  Positive electrodes · CPC title