Separator for all-solid-state batteries, method for producing the same, and all-solid-state battery

Patent metadata

Field	Value
Publication number	US-2020203696-A1
Application number	US-201916718491-A
Country	US
Kind code	A1
Filing date	Dec 18, 2019
Priority date	Dec 20, 2018
Publication date	Jun 25, 2020
Grant date	—

Abstract

To provide a separator for all-solid-state batteries, which is configured to achieve both increased tensile strength and excellent ion conductivity, a method for producing the same, and an all-solid-state battery comprising the separator for all-solid-state batteries. Disclosed is a separator for all-solid-state batteries, the separator comprising a first solid electrolyte layer comprising a solid electrolyte and a hydrogenated rubber-based resin where a content of the hydrogenated rubber-based resin in the first solid electrolyte layer is 15% by volume or more and 30% by volume or less, and the separator optionally further comprising, on at least one surface of the first solid electrolyte layer, a second solid electrolyte layer comprising a solid electrolyte and a hydrogenated rubber-based resin where a content of the hydrogenated rubber-based resin in the second solid electrolyte layer is 0.1% by volume or more and less than 15% by volume.

First claim

1 . A separator for all-solid-state batteries,
the separator comprising a first solid electrolyte layer comprising a solid electrolyte and a hydrogenated rubber-based resin where a content of the hydrogenated rubber-based resin in the first solid electrolyte layer is 15% by volume or more and 30% by volume or less, and the separator optionally further comprising, on at least one surface of the first solid electrolyte layer, a second solid electrolyte layer comprising a solid electrolyte and a hydrogenated rubber-based resin where a content of the hydrogenated rubber-based resin in the second solid electrolyte layer is 0.1% by volume or more and less than 15% by volume.

2 . The separator for all-solid-state batteries according to claim 1 , wherein the solid electrolyte of the first solid electrolyte layer and that of the second solid electrolyte layer comprise a sulfide solid electrolyte comprising Li 2 S, P 2 S 5 , LiI and LiBr.

3 . A method for producing the separator for all-solid-state batteries defined by claim 1 , the method comprising:
preparing a solid electrolyte layer forming slurry comprising a solid electrolyte, a hydrogenated rubber-based resin and a dispersion medium, forming a precursor film by applying the solid electrolyte layer forming slurry on a support and drying the applied slurry, and pressing the precursor film at a temperature which is 0° C. or more, which is less than a decomposition temperature of the hydrogenated rubber-based resin, and which is less than a crystallization temperature of the solid electrolyte.

4 . An all-solid-state battery comprising a cathode layer, an anode layer, and a separator for all-solid-state batteries, which is disposed between the cathode layer and the anode layer,
wherein the separator for all-solid-state batteries is the separator for all-solid-state batteries defined by claim 1 .

Assignees

• Toyota Motor Co Ltd

Inventors

• Minamida Yoshitaka

Classifications

• H01M10/0585 Primary

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M50/489

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title

• H01M50/414

  Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title

• H01M50/449

  having a layered structure · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title