Method for producing cathode, and method for producing oxide solid-state battery

Patent metadata

Field	Value
Publication number	US-2018212246-A1
Application number	US-201715837119-A
Country	US
Kind code	A1
Filing date	Dec 11, 2017
Priority date	Jan 25, 2017
Publication date	Jul 26, 2018
Grant date	—

Abstract

A method for producing a cathode that can lower a sintering temperature is provided. The method comprises: acid-treating particles of a lithium containing composite oxide that has a layered rock-salt structure; obtaining a mixture by mixing the acid-treated particles with a lithium salt whose melting point is lower than that of the lithium containing composite oxide; and heating and sintering the mixture.

First claim

What is claimed is:

1 . A method for producing a cathode, the method comprising:
acid-treating particles of a lithium containing composite oxide that has a layered rock-salt structure; obtaining a mixture by mixing the acid-treated particles with a lithium salt whose melting point is lower than that of the lithium containing composite oxide; and heating and sintering the mixture.

2 . The method according to claim 1 , wherein the lithium salt is at least one kind selected from the group consisting of lithium nitrate, lithium formate, and lithium acetate.

3 . The method according to claim 1 , wherein the lithium salt is a mixture of lithium formate and lithium acetate.

4 . The method according to claim 1 , wherein in said sintering the mixture, the mixture is heated either while or after pressurized.

5 . A method for producing an oxide solid-state battery, the method comprising:
acid-treating particles of a lithium containing composite oxide that has a layered rock-salt structure; obtaining a mixture by mixing the acid-treated particles with a lithium salt whose melting point is lower than that of the lithium containing composite oxide; obtaining a layered body by layering a layer that comprises the mixture, and a layer of an oxide solid electrolyte; and heating the layered body at a temperature of no less than the melting point of the lithium salt, and lower than reaction temperature of the mixture with the oxide solid electrolyte, and sintering the mixture on a surface of the layer of the oxide solid electrolyte.

6 . The method according to claim 5 , wherein
the oxide solid electrolyte contains garnet type lithium lanthanum zirconate, and a temperature at which the layered body is heated is no less than the melting point of the lithium salt, and lower than 600° C.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kawakami Masatsugu
• Ohta Shingo

Classifications

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M2300/0071

  Oxides · CPC title

• H01M4/1391 Primary

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

• H01M10/0562

  Solid materials · CPC title

• H01M10/052

  Li-accumulators · CPC title