Method for producing sintered electrode

Patent metadata

Field	Value
Publication number	US-2018277827-A1
Application number	US-201815894389-A
Country	US
Kind code	A1
Filing date	Feb 12, 2018
Priority date	Mar 21, 2017
Publication date	Sep 27, 2018
Grant date	—

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 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.

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 electrolyte mixture.

4 . The method according to claim 1 , wherein
the melting point of the lithium salt is lower than 600° C., and when at least the solid electrolyte mixture 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.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kawakami Masatsugu
• Ohta Shingo

Classifications

• H01M10/052

  Li-accumulators · CPC title

• C04B2235/3275

  Cobalt oxides, cobaltates or cobaltites or oxide forming salts thereof, e.g. bismuth cobaltate, zinc cobaltite · CPC title

• H01M2300/0077

  based on zirconium oxide · CPC title

• C04B2235/602

  Making the green bodies or pre-forms by moulding · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title