Positive electrode active material for nonaqueous electrolyte secondary battery and method of producing the same

Patent metadata

Field	Value
Publication number	US-9793540-B2
Application number	US-201414568346-A
Country	US
Kind code	B2
Filing date	Dec 12, 2014
Priority date	Dec 13, 2013
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

The present invention provides a positive electrode active material for non-aqueous electrolyte secondary battery comprising:
core particles comprising a lithium transition metal composite oxide represented by the general formula:

Li a Ni 1-x-y Co x M 1 y M 2 z O 2
 wherein 1.00≦a≦1.50, 0.00≦x≦0.50, 0.00≦y≦0.50, 0.00≦z≦0.02, 0.00≦x+y≦0.70, M 1 is at least one element selected from the group consisting of Mn and Al, M 2 is at least one element selected from the group consisting of Zr, Ta, Nb and Mo, and a surface layer located on a surface of the core particles, and the surface layer comprising boron, tungsten and oxygen; wherein the surface layer is obtained by heat-treating the core particles; a raw material compound (1) that is at least one compound selected from the group consisting of boron oxide, an oxo acid of boron, and a salt of an oxo acid of boron; and tungsten oxide (VI).

First claim

What is claimed is:

1. A method of producing a positive electrode active material for non-aqueous electrolyte secondary battery, the method comprising:
mixing core particles; a raw material compound (1) that is at least one compound selected from the group consisting of boron oxide, an oxo acid of boron, and a salt of an oxo acid of boron; and tungsten oxide (VI) to obtain a raw material mixture, wherein the core particles comprise a lithium transition metal composite oxide represented by the general formula:
Li a Ni 1-x-y Co x M 1 y M 2 z O 2

 wherein 1.00≦a≦1.50, 0.00≦x≦0.50, 0.00≦y≦0.50, 0.00≦z≦0.02, 0.00≦x+y≦0.70, M 1 is at least one element selected from the group consisting of Mn and Al, M 2 is at least one element selected from the group consisting of Zr, Ta, Nb and Mo; and heat-treating the raw material mixture to obtain a heat-treated product.

2. The method according to claim 1 , wherein the raw material compound (I) is at least one compound selected from the group consisting of H 3 BO 3 , Li 2 B 4 O 7 and NH 4 B 5 O 8 .

3. The method according to claim 1 , wherein the raw material compound (1) is H 3 BO 3 .

4. The method according to claim 1 , wherein a temperature of the heat treatment is 600° C. or less.

5. The method according to claim 1 , wherein a temperature of the heat treatment is 450° C. or less.

6. The method according to claim 2 , wherein the raw material compound (1) is H 3 BO 3 .

7. The method according to claim 2 , wherein a temperature of the heat treatment is 600° C. or less.

8. The method according to claim 2 , wherein a temperature of the heat treatment is 450° C. or less.

9. The method according to claim 6 , wherein a temperature of the heat treatment is 600° C. or less.

10. The method according to claim 6 , wherein a temperature of the heat treatment is 450° C. or less.

Assignees

• Nichia Corp

Inventors

• Kawai Kenta

Classifications

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/131

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

• H01M4/628

  Inhibitors, e.g. gassing inhibitors, corrosion inhibitors · 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

• H01M4/0471

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