Positive electrode active material for nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-2022293939-A1
Application number	US-202217828438-A
Country	US
Kind code	A1
Filing date	May 31, 2022
Priority date	Mar 31, 2016
Publication date	Sep 15, 2022
Grant date	—

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 particles of a lithium-transition metal composite oxide that contains nickel in the composition thereof and has a layered structure, wherein
a ratio D 50 /D SEM of a 50% particle size D 50 in volume-based cumulative particle size distribution to an average particle size D SEM 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; and wherein a molar ratio of nickel in a composition of the lithium-transition metal composite oxide to a total molar number of metals excluding lithium is 0.3 or more and 0.95 or less.

2 . The positive electrode active material according to claim 1 , wherein the D SEM is 7 or less.

3 . The positive electrode active material according to claim 1 , wherein the D SEM is 3 or less.

4 . 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.

5 . 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 a 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 represents at least one of Mn and Al.

6 . The positive electrode active material according to claim 5 , 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.

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

8 . The positive electrode active material according to claim 5 , 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.

9 . The positive electrode active material according to claim 5 , 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.

10 . The positive electrode active material according to claim 5 , wherein 0.3≤x<0.6, and the D 50 is in a range of 1 μm to 5.5 μm.

11 . The positive electrode active material according to claim 5 , wherein 0.3≤x<0.6, and the D 50 is in a range of 1 μm to 3 μm.

12 . The positive electrode active material according to claim 5 , wherein, when 0.3≤x<0.6, 1.1<p<1.2.

13 . The positive electrode active material according to claim 5 , wherein 0.6≤x<0.8, and the disorder of elemental nickel in the lithium-transition metal composite oxide particles determined by X-ray diffractometry is 2.0% or less.

14 . The positive electrode active material according to claim 5 , 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.

15 . The positive electrode active material according to claim 5 , wherein 0.6≤x<0.8, and the D 50 is in a range of 1 μm to 5.5 μm.

16 . The positive electrode active material according to claim 5 , wherein 0.8≤x≤0.95, and the disorder of elemental nickel determined by X-ray diffractometry is 4.0% or less.

17 . The positive electrode active material according to claim 5 , 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.

18 . The positive electrode active material according to claim 5 , wherein 0.8≤x≤0.95, and the D 50 is in a range of 1 μm to 5.5 μm.

19 . 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 .

20 . A nonaqueous electrolyte secondary battery comprising the electrode according to claim 19 .

Assignees

• Honda Motor Co Ltd
• Nichia Corp

Inventors

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

Classifications

• C01G53/50 Primary

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

• C01P2004/51

  Particles with a specific particle size distribution · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01P2004/03

  obtained by SEM · CPC title

• C01P2006/40

  Electric properties · CPC title