Positive electrode for solid-state batteries, solid-state battery and method for producing solid-state battery

Patent metadata

Field	Value
Publication number	US-11791452-B2
Application number	US-201816965600-A
Country	US
Kind code	B2
Filing date	Feb 2, 2018
Priority date	Feb 2, 2018
Publication date	Oct 17, 2023
Grant date	Oct 17, 2023

Abstract

Provided are: a positive electrode for solid-state batteries, which enables the achievement of high energy density, rate characteristics and durability; a solid-state battery; and a method for producing a solid-state battery.A positive electrode for solid-state batteries, which is provided with a collector and a positive electrode active material layer that contains a positive electrode active material, and which is configured such that: the ratio of the positive electrode active material, which is composed of primary particles, in the positive electrode active material layer is 60% by mass or more; the void fraction in the positive electrode active material layer is less than 20% by volume; and portions of the positive electrode active material layer other than the positive electrode active material, which is composed of primary particles, contain a solid electrolyte. The present invention also provides: a solid-state battery which comprises this positive electrode for solid-state batteries; and a method for producing this solid-state battery.

First claim

The invention claimed is:

1. A positive electrode for solid-stage batteries, comprising:
a current collector; and
a positive electrode active material layer containing a positive electrode active material, wherein
the positive electrode active material layer contains the positive electrode active material in a ratio of at least 60% by mass relative to a total amount of the positive electrode active material layer, the positive electrode active material layer has a void fraction of less than 20% by volume, and
remaining components of the positive electrode active material layer other than the positive electrode active material include a solid electrolyte,
average particle size DSEM is 1 to 7 μm based on electron microscope observation, and
a ratio (050/DSEM) of a 50% particle size D50 in a volume-based cumulative particle size distribution measured using a laser diffraction particle size distribution analyzer relative to the average particle size (DSEM) is 1 to 3.

2. The positive electrode for solid-state batteries according to claim 1 , wherein the positive electrode active material layer contains the positive electrode active material in a ratio of at least 75% by mass relative to a total amount of the positive electrode active material layer.

3. The positive electrode for solid-state batteries according to claim 2 , wherein the positive electrode active material layer contains the positive electrode active material in a ratio of at least 90% by mass relative to a total amount of the positive electrode active material layer.

4. The positive electrode for solid-state batteries according to claim 1 , wherein the positive electrode active material contains Ni, Mn, or Al as a main component.

5. A solid-state battery comprising the positive electrode for solid-state batteries according to claim 1 .

6. A method for producing a solid-state battery, comprising a pressurization step of pressurizing a stack obtained by disposing a solid electrolyte layer composed of a solid electrolyte between the positive electrode for solid-state batteries according to claim 1 and a negative electrode.

7. The method for producing a solid-state battery according to claim 6 , wherein in the pressurization step, the stack is pressurized at a pressing force of 1 to 10 ton/cm2.

8. The positive electrode for solid-state batteries according to claim 2 , wherein the positive electrode active material contains Ni, Mn, or Al as a main component.

9. The positive electrode for solid-state batteries according to claim 3 , wherein the positive electrode active material contains Ni, Mn, or Al as a main component.

10. A solid-state battery comprising the positive electrode for solid-state batteries according to claim 2 .

11. A solid-state battery comprising the positive electrode for solid-state batteries according to claim 3 .

12. A solid-state battery comprising the positive electrode for solid-state batteries according to claim 4 .

13. A method for producing a solid-state battery, comprising a pressurization step of pressurizing a stack obtained by disposing a solid electrolyte layer composed of a solid electrolyte between the positive electrode for solid-state batteries according to claim 2 and a negative electrode.

14. A method for producing a solid-state battery, comprising a pressurization step of pressurizing a stack obtained by disposing a solid electrolyte layer composed of a solid electrolyte between the positive electrode for solid-state batteries according to claim 3 and a negative electrode.

15. A method for producing a solid-state battery, comprising a pressurization step of pressurizing a stack obtained by disposing a solid electrolyte layer composed of a solid electrolyte between the positive electrode for solid-state batteries according to claim 4 and a negative electrode.

Assignees

• Honda Motor Co Ltd

Inventors

• Maeyama Hiroto
• Harada Ushio
• Kamaya Noriaki
• Okubo Sokichi
• Sukigara Toru

Classifications

• H01M4/131 Primary

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

• H01M4/362

  Composites · 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

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

• H01M10/049

  Processes for forming or storing electrodes in the battery container · CPC title