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

Patent metadata

Field	Value
Publication number	US-2025070134-A1
Application number	US-202218723145-A
Country	US
Kind code	A1
Filing date	Dec 23, 2022
Priority date	Dec 24, 2021
Publication date	Feb 27, 2025
Grant date	—

Abstract

A positive electrode active material includes lithium nickel-based oxide particles having a single-particle form composed of a single nodule or a single-particle-like form, which is a complex of at most 30 nodules. The positive electrode active material further includes a coating layer formed on the surface of the lithium nickel-based oxide particles, wherein the coating layer is formed by using a nano-sized coating precursor which is a chelate complex comprising lithium, nickel, cobalt, and M a , where M a is Mn, Al, or a combination thereof.

First claim

1 . A positive electrode active material, comprising:
lithium nickel-based oxide particles having a single-particle form or a single-particle-like form; and a coating layer formed on a surface of the lithium nickel-based oxide particles, wherein the coating layer is formed by using a nano-sized coating precursor which is a chelate complex comprising lithium, nickel, cobalt, and M a , wherein M a is Mn, Al, or a combination thereof, wherein the single-particle form is a single nodule, and wherein the single-particle-like form is a complex of 30 nodules or less.

2 . The positive electrode active material of claim 1 , wherein the lithium nickel-based oxide particles have a nickel content of 70 mol % or more among all metals excluding lithium.

3 . The positive electrode active material of claim 1 , wherein the lithium nickel-based oxide particles have a composition represented by Formula 1 below:
Li a Ni b Co c M 1 d M 2 e O 2   [Formula 1]
wherein M 1 is Mn, Al, or a combination thereof, M 2 is at least one selected from the group consisting of Zr, W, Y, Ba, Ca, Ti, Mg, Ta, and Nb, 0.8≤a≤1.2, 0.7≤b<1, 0<c<0.3, 0<d<0.3, and 0≤e≤0.2.

4 . The positive electrode active material of claim 1 , wherein the coating precursor is a chelating complex comprising lithium, nickel, cobalt, and manganese.

5 . The positive electrode active material of claim 1 , wherein the coating precursor has an average particle diameter (D 50 ) ranging from 1 nm to 500 nm.

6 . The positive electrode active material of claim 1 , wherein the coating layer has a composition represented by Formula 2 below:
Li x Ni y Co z M a w M b p O 2−q   [Formula 2]
wherein M a is Mn, Al, or a combination thereof, M b is at least one selected from the group consisting of Zr, W, Y, Ba, Ca, Ti, Mg, Ta, and Nb, 0.5≤x≤1.05, 0<y≤0.6, 0<z<0.4, 0<w<0.4, 0≤p≤0.2, and 0≤q≤0.5.

7 . The positive electrode active material of claim 1 , wherein the coating layer has a thickness ranging from 1 nm to 500 nm.

8 . A method of preparing a positive electrode active material, comprising:
reacting a coating precursor preparation solution including a chelating agent and a metal solution containing lithium, nickel, cobalt, and M a to prepare a nano-sized coating precursor; and dry-mixing the nano-sized coating precursor and lithium nickel-based oxide particles in a single-particle form composed of a single nodule or a single-particle-like form, which is a complex of at most 30 nodules, and then sintering the mixture to form a coating layer, wherein M a is Mn, Al, or a combination thereof.

9 . The method of claim 8 , wherein the chelating agent is a Lewis acid compound comprising at least one of a carboxylic acid group or a nitrogen element.

10 . The method of claim 9 , wherein the chelating agent is at least one selected from the group consisting of citric acid, polyvinylpyrrolidone, and glycolic acid.

11 . The method of claim 8 , wherein the coating precursor preparation solution is prepared by adding, to a solvent, the chelating agent and the metal solution, followed by mixing.

12 . The method of claim 11 , wherein the solvent is at least one selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, and 2,3-butanediol.

13 . The method of claim 8 , wherein the reacting is performed at 200° C. to 300° C.

14 . The method of claim 8 , wherein the sintering is performed at 800° C. to 900° C.

15 . The method of claim 14 , wherein the sintering is performed by elevating the temperature from 800° C. to 900° C. at a rate of 5° C./minute to 10° C./minute.

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

17 . A lithium secondary battery comprising:
the positive electrode according to claim 16 .

Assignees

• Lg Energy Solution Ltd

Inventors

• Jo Chi Ho
• Jung Wang Mo
• Yoo Tae Gu
• Hwang Jin Tae
• Jung Hae Jung
• Heo Jong Wook
• Cho Hyeon Jin

Classifications

• C01P2002/54

  one element only · CPC title

• C01P2004/45

  Aggregated particles or particles with an intergrown morphology · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01G53/506

  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

• C01G53/84

  Hydroxides · CPC title