Positive electrode active material for nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-2025096260-A1
Application number	US-202418966805-A
Country	US
Kind code	A1
Filing date	Dec 3, 2024
Priority date	Mar 31, 2016
Publication date	Mar 20, 2025
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 D SEM based on electron microscopic observation in a range of 1 μm to 7 μm in which 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.

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 have an average particle size D SEM based on electron microscopic observation in a range of 1μm to 7 μm,
a 50% particle size D 50 in volume-based cumulative particle size distribution in a range of 1μm to 5.5 μm, and a ratio D 50 /D SEM of the D 50 to the D SEM in a range of 1 to 4,
wherein the lithium-transition metal composite oxide contains nickel in the composition thereof and has a layered structure, and
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, and
wherein the D SEM is to be determined as follows: observing an image at a magnification of 1,000 to 10,000 using a scanning electron microscope (SEM), selecting 100 particles having recognizable outlines, calculating the equivalent spherical diameters of the selected particles using an image processing software, and determining the arithmetic average of the obtained equivalent spherical diameters as D SEM .

2 . The positive electrode active material according to claim 1 , wherein the lithium-transition metal composite oxide contains cobalt in the composition thereof and a molar ratio of cobalt to a total molar number of metals excluding lithium is 0.4 or less.

3 . The positive electrode active material according to claim 1 , wherein the lithium-transition metal composite oxide contains at least one of manganese and aluminum in the composition thereof and a molar ratio of a total molar number of manganese and aluminum to a total molar number of metals excluding lithium is 0.5 or less.

4 . The positive electrode active material according to claim 1 , wherein a molar ratio of lithium to a total molar number of metals excluding lithium is 1.0 or more and 1.3 or less.

5 . The positive electrode active material according to claim 1 , wherein a molar ratio of oxygen atom to a total molar number of metals excluding lithium is 1.9 or more and 2.1 or less.

6 . The positive electrode active material according to claim 1 , wherein the D SEM is 1.1 μm to 4 μm.

7 . 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.

8 . The positive electrode active material according to claim 1 , wherein a 90% particle size D 90 in volume-based cumulative particle size distribution is 2.8 μm to 16.4 μm, and a 10% particle size D 10 in volume-based cumulative particle size distribution is 1.1 μm to 7.6 μm.

9 . The positive electrode active material according to claim 1 , wherein the molar ratio of nickel to the total molar number of metals excluding lithium is 0.3 or more and less than 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.

10 . The positive electrode active material according to claim 1 , wherein the molar ratio of nickel to the total molar number of metals excluding lithium is 0.3 or more and less than 0.6, and a molar ratio of lithium to a total molar number of metals excluding lithium is more than 1.1 and less than 1.2.

11 . The positive electrode active material according to claim 1 , wherein the molar ratio of nickel to the total molar number of metals excluding lithium is 0.6 or more and less than 0.8, and a disorder of nickel element in the lithium-transition metal composite oxide particles determined by X-ray diffractometry is 2.0% or less.

12 . The positive electrode active material according to claim 1 , wherein the molar ratio of nickel to the total molar number of metals excluding lithium is 0.8 or more and 0.95 or less, and a disorder of nickel element in the lithium-transition metal composite oxide particles determined by X-ray diffractometry is 4.0% or less.

13 . 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 .

Assignees

• Honda Motor Co Ltd
• Nichia Corp

Inventors

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

Classifications

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/021

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

• H01M4/505

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

• H01M4/366

  as layered products · CPC title