Solid-state battery and method for producing the same

Patent metadata

Field	Value
Publication number	US-2023420735-A1
Application number	US-202318462729-A
Country	US
Kind code	A1
Filing date	Sep 7, 2023
Priority date	Dec 26, 2019
Publication date	Dec 28, 2023
Grant date	—

Abstract

A solid-state battery having a low heat generation amount and low resistance, and a method for producing the same. The solid-state battery is a solid-state battery comprising: a cathode comprising a cathode layer that contains an oxide-based cathode active material, an anode comprising an anode layer that contains an anode active material, and a solid electrolyte layer being disposed between the cathode layer and the anode layer and containing a solid electrolyte, wherein at least any one of the cathode layer and the solid electrolyte layer contains a sulfide-based solid electrolyte, and wherein the sulfide-based solid electrolyte comprises a high oxygen concentration layer on a contact surface with the oxide-based cathode active material, the high oxygen concentration layer having a higher oxygen element concentration than other parts except the contact surface.

First claim

1 . A solid-state battery comprising:
a cathode comprising a cathode layer that contains an oxide-based cathode active material, an anode comprising an anode layer that contains an anode active material, and a solid electrolyte layer being disposed between the cathode layer and the anode layer and containing a solid electrolyte, wherein at least any one of the cathode layer and the solid electrolyte layer contains a sulfide-based solid electrolyte, and wherein, the sulfide-based solid electrolyte comprises a high oxygen concentration layer on a contact surface with the oxide-based cathode active material, the high oxygen concentration layer having a higher oxygen element concentration than other parts except the contact surface.

2 . The solid-state battery according to claim 1 , where in a thickness of the high oxygen concentration layer is from 1 nm to 100 nm.

3 . A method for producing the solid-state battery defined by claim 1 , the method comprising:
battery forming of forming a solid-state battery comprising: a cathode comprising a cathode layer that contains an oxide-based cathode active material, an anode comprising an anode layer that contains an anode active material, and a solid electrolyte layer being disposed between the cathode layer and the anode layer and containing a solid electrolyte, charging the solid-state battery in an oxygen-free atmosphere until a potential of the cathode reaches 4.6 V or higher, and storing the solid-state battery in an oxygen-free atmosphere after the charging, wherein at least any one of the cathode layer and the solid electrolyte layer contains a sulfide-based solid electrolyte.

4 . The method for producing the solid-state battery according to claim 3 , wherein a storing temperature of the solid-state battery in the storing is from 60° C. to 80° C.

5 . The solid-state battery according to claim 1 , where in the high oxygen concentration layer is formed only on the contact surface of the sulfide-based solid electrolyte with the oxide-based cathode active material.

6 . The solid-state battery according to claim 2 , where in the thickness of the high oxygen concentration layer is from 25 nm to 50 nm.

7 . The method for producing the solid-state battery according to claim 4 , wherein a storing time of the solid-state battery in the storing step is from one hour to four hours.

8 . The solid-state battery according to claim 1 ,
wherein the oxide-based cathode active material is a composite cathode active material having a coating layer on the surface of the oxide-based cathode active material, and wherein the high oxygen concentration layer is formed on the contact surface of the sulfide-based solid electrolyte with the composite cathode active material.

9 . The solid-state battery according to claim 1 ,
wherein, when TEM-EDX analysis is performed, the sulfide-based solid electrolyte comprises a high oxygen concentration layer on a contact surface with the oxide-based cathode active material, the high oxygen concentration layer having a higher oxygen element concentration than other parts except the contact surface.

10 . A vehicle comprising the solid-state battery defined by claim 1 .

Assignees

• Toyota Motor Co Ltd

Inventors

• Yoshida Jun
• Shiotani Shinya
• Kubota Masaru
• Shindo Yohei
• Usami Takeshi

Classifications

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M4/483

  for non-aqueous cells (H01M4/485 takes precedence) · CPC title

• H01M10/446

  Initial charging measures · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/0525 Primary

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