Bipolar laminated all-solid-state lithium-ion rechargeable battery and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-2017263981-A1
Application number	US-201715451676-A
Country	US
Kind code	A1
Filing date	Mar 7, 2017
Priority date	Mar 11, 2016
Publication date	Sep 14, 2017
Grant date	—

Abstract

There is provided a bipolar laminated all-solid-state lithium-ion rechargeable battery including bipolar electrodes and solid electrolyte layers that are alternately laminated. When viewed from a lamination direction of the battery, a current collector layer of each bipolar electrode has its outer edge inside the outer edge of a positive electrode layer and a negative electrode layer of the bipolar electrode. At least one of the positive electrode layer and the negative electrode layer of each bipolar electrode is provided with at least one electrical insulating portion in an outer edge region on the surface where it is in contact with the current collector layer of the bipolar electrode. When each bipolar electrode is viewed from the lamination direction, the perspective projection of the at least one electrical insulating portion configures the entire periphery of the outer edge. The bipolar electrodes and the solid electrolyte layers form a sinter-bonded body.

First claim

What is claimed is:

1 . A bipolar laminated all-solid-state lithium-ion rechargeable battery comprising:
a plurality of bipolar electrodes and a plurality of solid electrolyte layers, each bipolar electrode consisting of: a current collector layer; a positive electrode layer formed on one principal surface of the current collector layer; and a negative electrode layer formed on the other principal surface of the current collector layer, wherein when viewed from the lamination direction, each bipolar electrode and each solid electrolyte layer have a quadrilateral or circular shape, and the current collector layer has its outer edge inside the outer edge of the positive electrode layer and the negative electrode layer, wherein at least one of the positive electrode layer and the negative electrode layer of each bipolar electrode is provided with at least one electrical insulating portion in a quadrilateral or circular outer edge region on the surface where the at least one of the positive electrode layer or the negative electrode layer is in contact with the current collector layer of the bipolar electrode, wherein when each bipolar electrode is viewed from the lamination direction, the projection of the at least one electrical insulating portion configures the entire periphery of the outer edge of the quadrilateral or circular shape, and wherein the plurality of bipolar electrodes and the plurality of solid electrolyte layers are alternately laminated and form a sinter-bonded body.

2 . The bipolar laminated all-solid-state lithium-ion rechargeable battery according to claim 1 ,
wherein when viewed from the lamination direction, each bipolar electrode and each solid electrolyte layer have a quadrilateral shape, and wherein the at least one electrical insulating portion of the positive electrode layer is disposed in one pair of opposite side regions of the quadrilateral shape, and the at least one electrical insulating portion of the negative electrode layer is disposed in the other pair of opposite side regions of the quadrilateral shape.

3 . The bipolar laminated all-solid-state lithium-ion rechargeable battery according to claim 1 ,
wherein the current collector layer contains a main component consisting of at least one of a carbon-based material and an electrical conductive oxide, wherein the positive electrode layer contains a main component consisting of a lithium transition metal composite oxide, wherein the negative electrode layer contains a main component consisting of at least one of a carbon-based material, a lithium transition metal composite oxide, and a lithium transition metal composite nitride, and wherein each solid electrolyte layer contains a main component consisting of a lithium composite oxide electrolyte.

4 . The bipolar laminated all-solid-state lithium-ion rechargeable battery according to claim 2 ,
wherein the current collector layer contains a main component consisting of at least one of a carbon-based material and an electrical conductive oxide, wherein the positive electrode layer contains a main component consisting of a lithium transition metal composite oxide, wherein the negative electrode layer contains a main component consisting of at least one of a carbon-based material, a lithium transition metal composite oxide, and a lithium transition metal composite nitride, and wherein each solid electrolyte layer contains a main component consisting of a lithium composite oxide electrolyte.

5 . A method for manufacturing a bipolar laminated all-solid-state lithium-ion rechargeable battery, the bipolar laminated all-solid-state lithium-ion rechargeable battery comprising a plurality of bipolar electrodes and a plurality of solid electrolyte layers that are alternately laminated, each bipolar electrode consisting of a current collector layer, a positive electrode layer formed on one principal surface of the current collector layer, and a negative electrode layer formed on the other principal surface of the current collector layer, the method comprising:
a current collector layer green substrate preparation step of preparing a plurality of current collector layer green substrates by forming a current collector layer green sheet containing a main component of the current collector layer and a resin binder and by cutting the current collector layer green sheet into a quadrilateral or circular shape of predetermined dimensions; a positive electrode layer green substrate preparation step of preparing a plurality of positive electrode layer green substrates by forming a positive electrode layer green sheet containing a main component of the positive electrode layer and a resin binder and by cutting the positive electrode layer green sheet into a quadrilateral or circular shape of predetermined dimensions; a negative electrode layer green substrate preparation step of preparing a plurality of negative electrode layer green substrates by forming a negative electrode layer green sheet containing a main component of the negative electrode layer and a resin binder and by cutting the negative electrode layer green sheet into a quadrilateral or circular shape of predetermined dimensions; a solid electrolyte layer green substrate preparation step of preparing a plurality of solid electrode layer green substrates by forming a solid electrolyte layer green sheet containing a main component of the solid electrolyte layer and a resin binder and by cutting the solid electrolyte layer green sheet into a quadrilateral or circular shape of predetermined dimensions; an all-solid-state battery green substrate laminated body formation step of forming an all-solid-state battery green substrate laminated body by sequentially laminating the negative electrode layer green substrates, the current collector layer green substrates, the positive electrode layer green substrates, and the solid electrolyte layer green substrates as prepared in the steps above; and an all-solid-state battery green substrate laminated body firing step of subjecting the all-solid-state battery green substrate laminated body as a whole to a firing process to form an all-solid-state battery sinter-bonded body in which the negative electrode layer, the current collector layer, and the positive electrode layer of each bipolar electrode and the solid electrolyte layers are sinter-bonded, wherein when viewed from a lamination direction, each bipolar electrode and each solid electrolyte layer is formed to have a quadrilateral or circular shape, and the current collector layer of each bipolar electrode is configured to have its outer edge inside the outer edge of the positive electrode layer and the negative electrode layer of the bipolar electrode, wherein at least one of the positive electrode layer and the negative electrode layer of each bipolar electrode is provided with at least one electrical insulating portion in a quadrilateral or circular outer edge region on the surface where the at least one of the positive electrode layer and the negative electrode layer is in contact with the current collector layer of the bipolar electrode, wherein when each bipolar electrode is viewed from the lamination direction, the projection of the at least one electrical insulating portion of the bipolar electrode is made up of the entire periphery of the outer edge of the quadrilateral or circular shape, wherein at least one of the positive electrode layer green substrate preparation step and the negative electrode layer green substrate preparation step is a step of forming an electrical insulating portion green sheet to become the at least one electrical insulating portion, then laminating at least one of a positive electrode active material portion green sheet and a negative electrode active material portion green sheet so as to

Assignees

• Hitachi Metals Ltd

Inventors

• Satou Akira

Classifications

• H01M2004/029

  Bipolar electrodes · CPC title

• H01M10/0585 Primary

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

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M10/0562

  Solid materials · CPC title