Method for producing sintered electrode

Patent metadata

Field	Value
Publication number	US-10720636-B2
Application number	US-201815894389-A
Country	US
Kind code	B2
Filing date	Feb 12, 2018
Priority date	Mar 21, 2017
Publication date	Jul 21, 2020
Grant date	Jul 21, 2020

Abstract

A sintered electrode having a large cathode capacity is obtained. A method for producing a sintered electrode which uses a lithium containing composite oxide as a cathode active material, and lithium lanthanum zirconate as an oxide solid electrolyte comprises: mixing at least the lithium containing composite oxide and a hydroxide, to obtain a cathode mixture; mixing at least the lithium lanthanum zirconate and a lithium salt that has a melting point lower than the lithium lanthanum zirconate, to obtain a solid electrolyte mixture; laminating the cathode mixture and the solid electrolyte mixture, to obtain a laminate; and heating the laminate, to sinter at least the solid electrolyte mixture.

First claim

What is claimed is:

1. A method for producing a sintered electrode which uses a lithium containing composite oxide as a cathode active material, and lithium lanthanum zirconate as an oxide solid electrolyte, the method comprising:
mixing at least the lithium containing composite oxide and a hydroxide, to obtain a cathode mixture;
mixing at least the lithium lanthanum zirconate and a lithium salt to obtain a solid mixture of electrolyte components, wherein the lithium salt is at least one selected from the group consisting of lithium nitrate, lithium formate, lithium acetate, lithium chloride, and lithium sulfate;
laminating the cathode mixture and the solid mixture of electrolyte components, to obtain a laminate; and
heating the laminate, to sinter at least the solid mixture of electrolyte components,
wherein the hydroxide is an alkali metal hydroxide.

2. The method according to claim 1 , wherein the lithium containing composite oxide used as the cathode active material has a layered rock-salt structure.

3. The method according to claim 1 , further comprising:
substituting hydrogen for at least some of lithium that constitutes lithium lanthanum zirconate; and
mixing hydrogen-substituted lithium lanthanum zirconate and the lithium salt, to obtain the solid mixture of electrolyte components.

4. The method according to claim 1 , wherein
a melting point of the lithium salt is lower than 600° C., and
when at least the solid mixture of electrolyte components is sintered by heating the laminate, the laminate is heated at a temperature of no less than the melting point of the lithium salt, and lower than 600° C.

5. A method for producing an oxide solid-state battery, the method comprising:
obtaining a sintered electrode by the method according to claim 1 ; and
providing an anode for the sintered electrode.

6. The method according to claim 1 , wherein
the lithium salt is at least two selected from the group consisting of lithium nitrate, lithium formate, lithium acetate, lithium chloride, and lithium sulfate.

7. The method according to claim 1 , wherein the hydroxide is a lithium hydroxide.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kawakami Masatsugu
• Ohta Shingo

Classifications

• Y02P70/50

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

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2300/0071

  Oxides · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/052

  Li-accumulators · CPC title