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

Patent metadata

Field	Value
Publication number	US-2021043918-A1
Application number	US-201816965600-A
Country	US
Kind code	A1
Filing date	Feb 2, 2018
Priority date	Feb 2, 2018
Publication date	Feb 11, 2021
Grant date	—

Abstract

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

1 . A positive electrode for solid-state batteries, comprising:
a current collector; and a positive electrode active material layer containing a positive electrode active material, wherein the positive electrode active material is composed of primary particles, the positive electrode active material layer contains the positive electrode active material in a ratio of at least 60% by mass, the positive electrode active material layer has a void fraction of less than 20% by mass, and remaining components of the positive electrode active material layer other than the positive electrode active material composed of primary particles include a solid electrolyte.

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 composed of primary particles in a ratio of at least 75% by mass.

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 composed of primary particles in a ratio of at least 90% by mass.

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

• H01M10/05

  Accumulators with non-aqueous electrolyte (H01M10/39 takes precedence) · CPC title

• H01M10/049

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

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M4/1391

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