Method for producing electrode assembly

Patent metadata

Field	Value
Publication number	US-9350013-B2
Application number	US-201414172006-A
Country	US
Kind code	B2
Filing date	Feb 4, 2014
Priority date	Feb 5, 2013
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

A method for producing an electrode assembly includes: obtaining a porous active material molded body by molding a constituent material containing a lithium multiple oxide in the form of particles by compression, and then performing a heat treatment at a temperature of 850° C. or higher and lower than the melting point of the used lithium multiple oxide; forming a solid electrolyte layer by applying a liquid containing a constituent material of an inorganic solid electrolyte to the surface of the active material molded body including the inside of each pore of the active material molded body, and then performing a heat treatment; and bonding a current collector to the active material molded body exposed from the solid electrolyte layer.

First claim

What is claimed is:

1. A method for producing an electrode assembly, comprising:
obtaining a porous active material molded body by molding a constituent material containing a lithium multiple oxide in the form of particles by compression, and then performing a heat treatment at a temperature of 850° C. or higher and lower than the melting point of the lithium multiple oxide;
forming a solid electrolyte layer by applying a liquid containing a constituent material of an inorganic solid electrolyte to the surface of the active material molded body including an inside of each pore of the active material molded body, and then performing a heat treatment; and
bonding a current collector to the active material molded body exposed from the solid electrolyte layer, wherein
a mass loss when forming the active material molded body and the solid electrolyte layer after heating to 400° C. for 30 minutes is 5% by mass or less.

2. The method for producing an electrode assembly according to claim 1 , wherein
the method further comprises polishing one surface of a composite body having the solid electrolyte layer formed on the active material molded body before the bonding the current collector, and
in the bonding the current collector, the current collector is bonded to the active material molded body exposed from the solid electrolyte layer on the polished surface formed in the polishing.

3. The method for producing an electrode assembly according to claim 1 , wherein the constituent material containing a lithium multiple oxide contains a lithium multiple oxide in the form of particles and a pore-forming material which is an organic material in the form of particles.

4. The method for producing an electrode assembly according to claim 3 , wherein the pore-forming material contains first particles composed of a material having deliquescence.

5. The method for producing an electrode assembly according to claim 4 , wherein the first particles are composed of polyacrylic acid.

6. The method for producing an electrode assembly according to claim 5 , wherein the pore-forming material further contains second particles composed of a material having no deliquescence.

7. The method for producing an electrode assembly according to claim 1 , wherein the lithium multiple oxide is LiC 0 O 2 .

8. The method for producing an electrode assembly according to claim 1 , wherein the inorganic solid electrolyte is Li 0.35 La 0.55 TiO 3 .

Assignees

• Seiko Epson Corp

Inventors

• Teraoka Tsutomu
• Ichikawa Sukenori
• Hokari Hirofumi
• Yokoyama Tomofumi

Classifications

• C04B37/00

  Joining burned ceramic articles with other burned ceramic articles or other articles by heating {(soldering and welding materials B23K35/24; laminated products B32B, E04C)} · CPC title

• C04B35/64

  Burning or sintering processes (C04B33/32 takes precedence {; powder metallurgy B22F}) · CPC title

• H01M10/052

  Li-accumulators · CPC title

• B32B37/06

  characterised by the heating method · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title