High-Nickel Positive Electrode Active Material, Producing Method Thereof, Positive Electrode and Lithium Secondary Battery Comprising the Same

Patent metadata

Field	Value
Publication number	US-2020185713-A1
Application number	US-201916700248-A
Country	US
Kind code	A1
Filing date	Dec 2, 2019
Priority date	Dec 10, 2018
Publication date	Jun 11, 2020
Grant date	—

Abstract

A method for producing a high-nickel positive electrode active material, a positive electrode active material produced thereby, and a positive electrode and a lithium secondary battery including the same is provided. The method includes preparing a lithium composite transition metal oxide having a nickel content of 80 atm % or greater among transition metals, washing the lithium composite transition metal oxide, and mixing the washed lithium composite transition metal oxide with an aluminum raw material and heat treating the mixture at a temperature of 650° C. to 690° C. to obtain a positive electrode active material having a surface portion doped with aluminum.

First claim

1 . A method for producing a high-nickel positive electrode active material, comprising:
preparing a lithium composite transition metal oxide having a nickel content of 80 atm % or greater among transition metals; washing the lithium composite transition metal oxide; and mixing the washed lithium composite transition metal oxide with an aluminum raw material and heat treating the mixture at a temperature of 650° C. to 690° C. to obtain a positive electrode active material having a surface portion doped with aluminum.

2 . The method of claim 1 , wherein the lithium composite transition metal oxide is represented by [Formula 1] below:
Li a Ni b CO c Mn d M e O 2   [Formula 1]
in Formula 1, M is one or more selected from the group consisting of W, Cu, Fe, Ba, V, Cr, Ti, Zr, Zn, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo, and 0.9≤a≤1.5, 0.8≤b<1.0, 0<c<0.2, 0<d<0.2, and 0≤e≤0.02.

3 . The method of claim 1 , wherein the aluminum raw material comprises an aluminum-containing acetate, an aluminum-containing nitrate, an aluminum-containing sulfate, an aluminum-containing halide, an aluminum-containing sulfide, an aluminum-containing hydroxide, an aluminum-containing oxide, an aluminum-containing oxyhydroxide, or a mixture thereof.

4 . The method of claim 1 , wherein the aluminum raw material is mixed in an amount of 0.05 parts by weight to 1 parts by weight based on 100 parts by weight of the washed lithium composite transition metal oxide.

5 . The method of claim 1 , wherein the heat treatment is performed in an oxygen atmosphere.

6 . The method of claim 1 , wherein the mixing is dry-mixing.

7 . A high-nickel positive electrode active material having an average composition represented by Formula 2 below:
Li x Ni y Co z Mn w Al v M u O 2   [Formula 2]
in Formula 2, M is one or more selected from the group consisting of W, Cu, Fe, Ba, V, Cr, Ti, Zr, Zn, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo, and −0.1≤x≤0.5, 0.8≤y<1.0, 0<z<0.2, 0<w<0.2, 0.001≤v≤0.05, and 0≤u≤0.02, wherein a doping concentration of Al gradually decreases from a surface of the positive electrode active material toward the center thereof.

8 . The high-nickel positive electrode active material of claim 7 , wherein an atomic fraction of Al in all transition metals is 2 atm % or greater at a depth of 50 nm or less from the surface of the positive electrode active material.

9 . The high-nickel positive electrode active material of claim 8 , wherein the atomic fraction of Al in all transition metals is 2 atm % to 15 atm % at a depth of 50 nm or less from the surface of the positive electrode active material.

10 . A positive electrode comprising the high-nickel positive electrode active material of claim 7 .

11 . A lithium secondary battery comprising the positive electrode of claim 10 .

12 . The method of claim 2 , wherein the M is a doping element substituted for a transition metal site of the lithium composite transition metal oxide.

13 . The high-nickel positive electrode active material of claim 7 , wherein the M is a doping element substituted for a transition metal site of the lithium composite transition metal oxide

Assignees

• Lg Chemical Ltd

Inventors

• Hwang Jin Tae
• Lee Dong Hun
• Park Sung Bin
• Cho Hyung Man
• Han Jung Min
• Jung Wang Mo

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

• C01G53/50 Primary

  of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 · CPC title

• C01P2006/40

  Electric properties · CPC title

• H01M10/052

  Li-accumulators · CPC title