Electrode for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery provided with same

Patent metadata

Field	Value
Publication number	US-11978885-B2
Application number	US-202117493901-A
Country	US
Kind code	B2
Filing date	Oct 5, 2021
Priority date	Nov 8, 2016
Publication date	May 7, 2024
Grant date	May 7, 2024

Abstract

An electrode for nonaqueous electrolyte secondary batteries, provided with a collector and a positive electrode active material layer arranged on the collector and contains a positive electrode active material. The positive electrode active material contains compound particles which have a layered structure composed of two or more transition metals, and which have an average particle diameter DSEM of from 1 μm to 7 μm (inclusive) based on the observation with an electron microscope, a ratio of the 50% particle diameter D50 in a volume-based cumulative particle size distribution to the average particle diameter DSEM, namely D50/DSEM of from 1 to 4 (inclusive), and a ratio of the 90% particle diameter D90 in the volume-based cumulative particle size distribution to the 10% particle diameter D10 in the volume-based cumulative particle size distribution, namely D90/D10 of 4 or less. The positive electrode active material layer has a void fraction of 10-45%.

First claim

The invention claimed is:

1. An electrode for nonaqueous electrolyte secondary batteries comprising:
a collector; and
a positive electrode active material layer that is arranged on the collector and contains a positive electrode active material,
wherein the positive electrode active material comprises lithium transition metal composite oxide particles represented by the following formula (1),
wherein the particles have:
a layered structure composed of two or more transition metals,
an arithmetic average particle diameter DSEM of 1.1 to 7 μm based on an observation with an electron microscope,
50% particle diameter D50 in a volume-based cumulative particle size distribution of 1 to 3.3 μm, the volume-based cumulative particle size distribution being measured using a laser diffraction particle size distribution analyzer,
a ratio of the 50% particle diameter D50 in the volume-based cumulative particle size distribution to the arithmetic average particle diameter DSEM (D50/DSEM) of 1 to 4, and
a ratio of the 90% particle diameter D90 in the volume-based cumulative particle size distribution to the 10% particle diameter D10 in the volume-based cumulative particle size distribution (D90/D10) of 4 or less, and
the positive electrode active material layer has a void fraction of 10 to 37%, and
in the positive electrode active material layer, an average diameter of a void is 0.03 to 0.2 μm,
Li p Ni x Co y M 1 z O 2+α   Formula (1)

in the formula (1), p, x, y, z, and a satisfy 1.0≤p≤1.3, 0.3≤x<0.6, 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.

2. An electrode for nonaqueous electrolyte secondary batteries comprising:
a collector; and
a positive electrode active material layer that is arranged on the collector and contains a positive electrode active material,
wherein the positive electrode active material comprises lithium transition metal composite oxide particles represented by the following formula (1),
wherein the particles have:
a layered structure composed of two or more transition metals,
an arithmetic average particle diameter DSEM of 1.1 to 7 μm based on an observation with an electron microscope,
a ratio of the 50% particle diameter D50 in a volume-based cumulative particle size distribution to the arithmetic average particle diameter DSEM (D50/DSEM) of 1 to 4, the volume-based cumulative particle size distribution being measured using a laser diffraction particle size distribution analyzer, and
a ratio of the 90% particle diameter D90 in the volume-based cumulative particle size distribution to the 10% particle diameter D10 in the volume-based cumulative particle size distribution (D90/D10) of 4 or less, and
the positive electrode active material layer has a void fraction of 12 to 37%, and
in the positive electrode active material layer, an average diameter of a void is 0.03 to 0.2 μm,
Li p Ni x Co y M 1 z O 2+α   Formula (1)

in the formula (1), p, x, y, z, and α satisfy 1.0≤p≤1.3, 0.6≤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.

3. The electrode for nonaqueous electrolyte secondary batteries according to claim 1 , wherein the positive electrode active material layer has density of 2.7 to 3.9 g/cm 3 .

4. The electrode for nonaqueous electrolyte secondary batteries according to claim 2 , wherein the positive electrode active material layer has density of 2.7 to 3.9 g/cm 3 .

5. The electrode for nonaqueous electrolyte secondary batteries according to claim 1 , wherein, in the positive electrode active material layer, a peak diameter of a void in a void distribution curve is 0.06 to 0.3 μm.

6. The electrode for nonaqueous electrolyte secondary batteries according to claim 2 , wherein, in the positive electrode active material layer, a peak diameter of a void in a void distribution curve is 0.06 to 0.3 μm.

7. The electrode for nonaqueous electrolyte secondary batteries according to claim 1 , wherein, in the positive electrode active material layer, a ratio of a peak diameter of a void to the average diameter of the void (peak diameter/average diameter) is 1.1 to 2.4.

8. The electrode for nonaqueous electrolyte secondary batteries according to claim 2 , wherein, in the positive electrode active material layer, a ratio of a peak diameter of a void to the average diameter of the void (peak diameter/average diameter) is 1.1 to 2.4.

9. The electrode for nonaqueous electrolyte secondary batteries according to claim 1 , wherein the positive electrode active material contains Ni, Mn, or Al as a main component.

10. The electrode for nonaqueous electrolyte secondary batteries according to claim 2 , wherein the positive electrode active material contains Ni, Mn, or Al as a main component.

11. A nonaqueous electrolyte secondary battery comprising the electrode for nonaqueous electrolyte secondary batteries described in claim 1 .

12. A nonaqueous electrolyte secondary battery comprising the electrode for nonaqueous electrolyte secondary batteries described in claim 2 .

Assignees

• Honda Motor Co Ltd
• Nichia Corp

Inventors

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

Classifications

• H01M4/131 Primary

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

• H01M4/366

  as layered products · CPC title

• H01M4/505

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

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M10/0525

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