Positive electrode active material for non-aqueous secondary battery and method of manufacturing thereof

Patent metadata

Field	Value
Publication number	US-9450237-B2
Application number	US-201514667636-A
Country	US
Kind code	B2
Filing date	Mar 24, 2015
Priority date	Mar 24, 2014
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

A positive electrode active material for non-aqueous secondary battery includes core particles containing a lithium transition metal composite oxide, and a covering layer covering, that covers a surface of the core particle. The covering layer contains niobium and carbonate ions, and the carbonate ions are present at a concentration of from 0.2 weight % to 0.4 weight %. The positive electrode active material for non-aqueous secondary battery exhibits infrared absorption peaks at a wavenumber range of from 1320 cm −1 to 1370 cm −1 , and at a wavenumber range of from 1640 cm −1 to 1710 cm −1 .

First claim

What is claimed is:

1. A positive electrode active material for non-aqueous secondary battery, the positive electrode active material comprising:
core particles containing a lithium transition metal composite oxide, and
a covering layer, that covers a surface of the core particle, wherein the covering layer comprises niobium and carbonate ion and the carbonate ions are present at a concentration of from 0.2 weight % to 0.4 weight %;
and exhibits infrared absorption peaks at a wavenumber range of from 1320 cm-1 to 1370 cm −1 , and at a wavenumber range of from 1640 cm-1 to 1710 cm −1 ,
wherein the lithium transition metal complex oxide is represented by the following formula:
Li a Ni 1-x-y Co x Mn y O 2

and a, x, and y, respectively, satisfy 0.95≦a≦1.2, 0.30≦x≦0.40, 0.30≦y≦0.40, 0.60≦x+y≦0.70.

2. The positive electrode active material according to claim 1 , wherein the niobium in the covering layer is present at a concentration of from 0.05 mol % to 5.0 mol % with respect to the lithium transition metal composite oxide.

3. The positive electrode active material according to claim 2 , wherein the carbonate ion concentration in the covering layer is in a range of from 0.2 weight % to 0.3 weight %.

4. The positive electrode active material according to claim 3 , wherein the particle diameter of the core particles may be in a range of from 3 μm to 20 μm in terms of volume average particle diameter.

5. The positive electrode active material according to claim 2 , wherein the particle diameter of the core particles may be in a range of from 3 μm to 20 μm in terms of volume average particle diameter.

6. The positive electrode active material according to claim 1 , wherein the carbonate ion concentration in the covering layer is in a range of from 0.2 weight % to 0.3 weight %.

7. The positive electrode active material according to claim 6 , wherein the content of niobium in the covering layer is in a range of from 0.5 mol % to 3.0 mol % with respect to the lithium transition metal composite oxide.

8. The positive electrode active material according to claim 7 , wherein the particle diameter of the core particles may be in a range of from 3 μm to 20 μm in terms of volume average particle diameter.

9. The positive electrode active material according to claim 6 , wherein the particle diameter of the core particles may be in a range of from 3 μm to 20 μm in terms of volume average particle diameter.

10. The positive electrode active material according to claim 1 , wherein the content of niobium in the covering layer is in a range of from 0.5 mol % to 3.0 mol % with respect to the lithium transition metal composite oxide.

11. The positive electrode active material according to claim 10 , wherein the particle diameter of the core particles may be in a range of from 3 μm to 20 μm in terms of volume average particle diameter.

12. The positive electrode active material according to claim 1 , wherein the particle diameter of the core particles may be in a range of from 3 μm to 20 μm in terms of volume average particle diameter.

Assignees

• Nichia Corp

Inventors

• Yoshida Hideki

Classifications

• H01M4/505

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

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/0402

  Methods of deposition of the material · CPC title

• H01M4/1391 Primary

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title