Method of Preparing Positive Electrode Active Material for Secondary Battery

Patent metadata

Field	Value
Publication number	US-2020266439-A1
Application number	US-201816762363-A
Country	US
Kind code	A1
Filing date	Nov 13, 2018
Priority date	Nov 13, 2017
Publication date	Aug 20, 2020
Grant date	—

Abstract

A method of preparing a positive electrode active material for a secondary battery includes preparing a positive electrode active material precursor including nickel (Ni), cobalt (Co), and at least one selected from the group consisting of manganese (Mn) and aluminum (Al); and forming a lithium composite transition metal oxide by mixing the positive electrode active material precursor and a lithium source and performing calcination, wherein the positive electrode active material precursor includes nickel (Ni) in an amount of 60 mol % or more out of the entire metal element, and a molar ratio (Li/M) of lithium (Li) of the lithium source to the entire metal element (M) of the positive electrode active material precursor is greater than 1.1.

First claim

1 . A method of preparing a positive electrode active material for a secondary battery, comprising:
preparing a positive electrode active material precursor including nickel (Ni), cobalt (Co), and at least one selected from the group consisting of manganese (Mn) and aluminum (Al); and forming a lithium composite transition metal oxide by mixing the positive electrode active material precursor and a lithium source and performing calcination, wherein the positive electrode active material precursor includes nickel (Ni) in an amount of 60 mol % or more based on a total number of moles of metal elements, and a molar ratio (Li/M) of lithium (Li) of the lithium source to the metal element (M) of the positive electrode active material precursor is greater than 1.1.

2 . The method of claim 1 , wherein the molar ratio (Li/M) is 1.105 to 1.30.

3 . The method of claim 1 , wherein the molar ratio (Li/M) 1.13 to 1.20.

4 . The method of claim 1 , wherein the positive electrode active material precursor includes nickel (Ni) in an amount of 80 mol % or more based on a total number of moles of metal elements.

5 . The method of claim 1 , wherein the positive electrode active material precursor includes nickel (Ni), cobalt (Co), manganese (Mn), and aluminum (Al).

6 . The method of claim 1 , wherein the positive electrode active material precursor is represented by Chemical Formula 1 below:
Ni 1−(x1+y1+z1) Co x1 M a y1 M b z1 (OH) 2   [Chemical Formula 1]
wherein M a is at least one element selected from the group consisting of Mn and Al, M b is at least one element selected from the group consisting of Zr, W, Mg, Al, Ce, Hf, Ta, La, Ti, Sr, Ba, Nb, Mo, and Cr, and 0<x1≤0.4, 0<y1≤0.4, 0≤z1≤0.1, and 0<x1+y1+z1≤0.4.

7 . The method of claim 1 , wherein the calcination is carried out at a calcination temperature of 700 to 900° C.

8 . The method of claim 1 , wherein the calcination is carried out while raising a temperature to a calcination temperature at a temperature elevation rate of 2 to 10° C./min.

9 . The method of claim 1 , wherein the calcination is carried out under an oxygen atmosphere.

10 . The method of claim 1 , further comprising, washing the lithium composite transition metal oxide after the formation of a lithium composite transition metal oxide.

Assignees

• Lg Chemical Ltd

Inventors

• Park Sung Bin
• Jung Wang Mo
• Lee Dong Hun
• Kim Ji Hye
• Kim Dong Hwi
• Cho Hyung Man
• Han Jung Min

Classifications

• 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

• H01M4/525 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

• H01M10/052

  Li-accumulators · CPC title

• H01M4/505

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

• C01G53/44 Primary

  containing manganese · CPC title