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

Patent metadata

Field	Value
Publication number	US-2016359163-A1
Application number	US-201615243369-A
Country	US
Kind code	A1
Filing date	Aug 22, 2016
Priority date	Mar 24, 2014
Publication date	Dec 8, 2016
Grant date	—

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 method of manufacturing a positive electrode active material comprising:
providing an oxalic acid-containing niobium oxide sol in which a molar ratio of oxalic acid to niobium oxide (COOH) 2 /Nb 2 O 5 is in range of from 0.01 to 0.6; mixing core particles that contain a lithium transition metal composite oxide with the oxalic acid-containing niobium oxide sol to obtain sol-containing particles in which the oxalic acid-containing niobium oxide sol is present on surfaces of the core particles; and heat treating the sol-containing particles at a temperature in the range of from 250° C. to 500° C., to form a covering layer which contains niobium and carbonate ions on the surfaces of the core particles.

2 . The method of manufacturing a positive electrode active material according to claim 1 , wherein a mass ratio of the niobium oxide sol containing oxalic acid with respect to the core particles is in the range of from 0.05 to 0.5.

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

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

5 . The method of manufacturing a positive electrode active material according to claim 1 , wherein heat treating time is in a range of from 3 hours to 15 hours.

6 . The method of manufacturing a positive electrode active material according to claim 2 , wherein heat treating time is in a range of from 3 hours to 15 hours.

7 . The method of manufacturing a positive electrode active material according to claim 3 , wherein heat treating time is in a range of from 3 hours to 15 hours.

8 . The method of manufacturing a positive electrode active material according to claim 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.

9 . The method of manufacturing a positive electrode active material according to claim 2 , 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.

10 . The method of manufacturing a positive electrode active material according to claim 3 , 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.

11 . The method of manufacturing a positive electrode active material according to claim 5 , 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.

Assignees

• Nichia Corp

Inventors

• Yoshida Hideki

Classifications

• H01M4/366

  as layered products · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/0402

  Methods of deposition of the material · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M4/505

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