Method of preparing positive electrode active material for secondary battery

Patent metadata

Field	Value
Publication number	US-12378133-B2
Application number	US-202017422014-A
Country	US
Kind code	B2
Filing date	Jan 21, 2020
Priority date	Jan 21, 2019
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

A method of preparing a positive electrode active material for a secondary battery includes preparing a positive electrode active material precursor containing 60 mol % or more of nickel (Ni) among total metals, mixing the positive electrode active material precursor and a lithium raw material source and performing primary pre-sintering in an oxidizing atmosphere to form a pre-sintered product, and performing secondary main sintering on the pre-sintered product in an air atmosphere to form a lithium transition metal oxide.

First claim

The invention claimed is:

1. A method of preparing a positive electrode active material for a secondary battery, comprising:
preparing a positive electrode active material precursor containing 60 mol % or more of nickel (Ni) among total metals;
mixing the positive electrode active material precursor and a lithium raw material source, and performing primary pre-sintering in an oxidizing atmosphere to form a pre-sintered product; and
performing secondary main sintering on the pre-sintered product in an air atmosphere to form a lithium transition metal oxide,
wherein the primary pre-sintering is performed while supplying oxygen,
wherein the primary pre-sintering is performed for 3 hours to 7 hours after a sintering temperature is reached,
wherein the secondary main sintering is performed after stopping oxygen supply,
wherein the positive electrode active material precursor is a compound including nickel (Ni), cobalt (Co), and manganese (Mn), and
wherein the pre-sintered product has a structure including a layered structure.

2. The method of claim 1 , wherein a sintering temperature of the primary pre-sintering is in a range of 400° C. to 700° C.

3. The method of claim 1 , wherein a sintering temperature of the secondary main sintering is in a range of 700° C. to 1,000° C.

4. The method of claim 1 , wherein the pre-sintered product has a structure including a layered structure.

5. The method of claim 1 , wherein the positive electrode active material precursor contains 80 mol % or more of the nickel (Ni) among the total metals.

6. The method of claim 1 , wherein the lithium transition metal oxide is represented by Formula 1:
Li p Ni 1−(x1+y1+z1) Co x1 M a y1 M b z1 O 2+δ   [Formula 1]

wherein, in Formula 1,
M a is manganese (Mn), or manganese (Mn) and aluminum (Al),
M b is at least one element selected from the group consisting of Al, zirconium (Zr), titanium (Ti), magnesium (Mg), tantalum (Ta), niobium (Nb), molybdenum (Mo), chromium (Cr), barium (Ba), strontium (Sr), tungsten (W), and calcium (Ca),
0.9≤p≤1.3, 0≤x1<0.5, 0≤y1≤0.5, 0≤z1≤0.1, 0≤x1+y1+z1≤0.4, and −0.1≤δ≤1.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Kyung Lok
• Shin Ji A
• You Min Kyu
• Choi Sang Soon

Classifications

• C01P2006/40

  Electric properties · CPC title

• C01G53/502

  containing lithium and cobalt · CPC title

• C01G53/42

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

• H01M10/052

  Li-accumulators · 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