Positive electrode active material for nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-10622629-B2
Application number	US-201715474735-A
Country	US
Kind code	B2
Filing date	Mar 30, 2017
Priority date	Mar 31, 2016
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

A positive electrode active material for a nonaqueous electrolyte secondary battery includes particles of a lithium-transition metal composite oxide that contains nickel in the composition thereof and has a layered structure. The particles have an average particle size DSEM based on electron microscopic observation in a range of 1 μm to 7 μm in which a ratio D50/DSEM of a 50% particle size D50 in volume-based cumulative particle size distribution to the average particle size based on electron microscopic observation is in a range of 1 to 4, and a ratio D90/D10 of a 90% particle size D90 to a 10% particle size D10 in volume-based cumulative particle size distribution is 4 or less.

First claim

What is claimed is:

1. A positive electrode active material for a nonaqueous electrolyte secondary battery, comprising primary particles of a lithium-transition metal composite oxide that contains nickel in the composition thereof and has a layered structure, the primary particles having an average particle size D SEM based on electron microscopic observation in a range of 1 μm to 7 μm, wherein
a ratio D 50 /D SEM of a 50% particle size D 50 in volume-based cumulative particle size distribution to the average particle size based on electron microscopic observation is in a range of 1 to 4, and
a ratio D 90 /D 10 of a 90% particle size D 90 to a 10% particle size D 10 in volume-based cumulative particle size distribution is 4 or less.

2. The positive electrode active material according to claim 1 , wherein the ratio D 50 /D SEM of the D 50 to the D SEM is 1 to 3.

3. The positive electrode active material according to claim 1 , wherein the lithium-transition metal composite oxide has a composition represented by the following formula (1):
Li p Ni x Co y M 1 z O 2+α   (1),

wherein p, x, y, z, and α satisfy 1.0≤p≤1.3, 0.3≤x≤0.95, 0≤y≤0.4, 0≤z≤0.5, x+y+z=1, and −0.1≤α≤0.1, and M 1 represents at least one of Mn and Al.

4. The positive electrode active material according to claim 3 , wherein 0.3≤x<0.8, and the ratio D 50 /D SEM of the D 50 to the D SEM is in a range of 1 to 2.

5. The positive electrode active material according to claim 3 , wherein 0.3≤x<0.6, and a disorder of nickel element in the lithium-transition metal composite oxide primary particles determined by X-ray diffractometry is 1.5% or less.

6. The positive electrode active material according to claim 3 , wherein 0.3≤x<0.6, and the ratio D 90 /D 10 of the D 90 to the D 10 is 3 or less.

7. The positive electrode active material according to claim 3 , wherein 0.3≤x<0.6, and the ratio D 90 /D 10 of the D 90 to the D 10 is 2.5 or less.

8. The positive electrode active material according to claim 3 , wherein 0.3≤x<0.6, and the D 50 is in a range of 1 μm to 5.5 μm.

9. The positive electrode active material according to claim 3 , wherein 0.3≤x<0.6, and the D 50 is in a range of 1 μm to 3 μm.

10. The positive electrode active material according to claim 3 , wherein, when 0.3≤x<0.6, 1.1<p<1.2.

11. The positive electrode active material according to claim 3 , wherein 0.6≤x<0.8, and the disorder of elemental nickel in the lithium-transition metal composite oxide primary particles determined by X-ray diffractometry is 2.0% or less.

12. The positive electrode active material according to claim 3 , wherein 0.6≤x<0.8, and the ratio D 90 /D 10 of the D 90 to the D 10 is 2.3 or less.

13. The positive electrode active material according to claim 3 , wherein 0.6≤x<0.8, and the D 50 is in a range of 1 μm to 5.5 μm.

14. The positive electrode active material according to claim 3 , wherein 0.8≤x≤0.95, and the disorder of elemental nickel determined by X-ray diffractometry is 4.0% or less.

15. The positive electrode active material according to claim 3 , wherein 0.8≤x≤0.95, and the ratio D 90 /D 10 of the D 90 to the D 10 is 3 or less.

16. The positive electrode active material according to claim 3 , wherein 0.8≤x≤0.95, and the D 50 is in a range of 1 μm to 5.5 μm.

17. An electrode for a nonaqueous electrolyte secondary battery, comprising:
a current collector; and
a positive electrode active material layer that is disposed on the current collector and contains the positive electrode active material according to claim 1 .

18. A nonaqueous electrolyte secondary battery comprising the electrode according to claim 17 .

Assignees

• Honda Motor Co Ltd
• Nichia Corp

Inventors

• Ogawa Atsushi
• Kawamura Soshi
• Sukigara Toru
• Maeyama Hiroto
• Kobayashi Kenichi

Classifications

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• C01P2002/20

  Two-dimensional structures · CPC title

• C01G53/42

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

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/366

  as layered products · CPC title