Energy storage device, method for manufacturing energy storage device, and energy storage apparatus

Patent metadata

Field	Value
Publication number	US-2024356043-A1
Application number	US-202218693359-A
Country	US
Kind code	A1
Filing date	Sep 21, 2022
Priority date	Sep 22, 2021
Publication date	Oct 24, 2024
Grant date	—

Abstract

An energy storage device according to one aspect of the present invention includes: an electrode assembly including a positive electrode, a negative electrode, and a separator; and a nonaqueous electrolyte, in which the negative electrode includes: a negative substrate; a first layer disposed directly or indirectly on the separator side of the negative substrate and containing a metal of gold, platinum, or a combination thereof; and a second layer disposed on the separator side of the first layer, containing a polymer having lithium ion conductivity and a lithium salt, and capable of regulating passage of the nonaqueous electrolyte, and the negative electrode further includes a lithium metal layer disposed between the negative substrate and the first layer.

First claim

1 . An energy storage device comprising:
an electrode assembly including a positive electrode, a negative electrode, and a separator; and a nonaqueous electrolyte, wherein the negative electrode includes a negative substrate, a first layer disposed directly or indirectly on the separator side of the negative substrate and containing a metal of gold, platinum, or a combination thereof, and a second layer disposed on the separator side of the first layer, containing a polymer having lithium ion conductivity and a lithium salt, and regulating passage of the nonaqueous electrolyte, and the negative electrode further includes a lithium metal layer disposed between the negative substrate and the first layer.

2 . The energy storage device according to claim 1 , wherein the polymer contained in the second layer includes a polymer material containing vinylene carbonate, acrylonitrile, or a combination thereof as a monomer.

3 . The energy storage device according to claim 1 , wherein the negative electrode further includes a lithium metal layer disposed between the first layer and the separator.

4 . The energy storage device according to claim 1 , wherein the separator includes a substrate layer and an inorganic material layer disposed on the negative electrode side of the substrate layer.

5 . The energy storage device according to claim 1 , wherein the lithium salt is lithium difluorophosphate, lithium difluoro(oxalato)borate, lithium bis(trifluoromethanesulfonyl)imide, or a combination thereof.

6 . The energy storage device according to claim 1 , wherein the electrode assembly is in a state of being pressed in a thickness direction thereof.

7 . A method for manufacturing an energy storage device comprising:
preparing a positive electrode; preparing a separator; preparing a negative electrode; and producing an electrode assembly by stacking the positive electrode, the separator, and the negative electrode such that the positive electrode, the separator, and the negative electrode are arranged in this order, wherein the preparing the negative electrode includes forming a first layer containing a metal of gold, platinum, or a combination thereof directly or indirectly on the separator side of a negative substrate, forming a second layer containing a polymer having lithium ion conductivity and a lithium salt and restricting passage of the nonaqueous electrolyte on the separator side of the first layer, and forming a lithium metal layer between the negative substrate and the first layer.

8 . An energy storage apparatus comprising:
one or a plurality of energy storage devices according to claim 1 ; and a restraining member that restrains the one or the plurality of energy storage devices, wherein the one or the plurality of energy storage devices are pressed in a thickness direction of the electrode assembly by the restraining by the restraining member, whereby the electrode assembly is pressed.

Assignees

• Gs Yuasa Int Ltd

Inventors

• Itami Yuya
• Watanabe Hideto
• Muramatsu Hiromasa
• Nishikawa Heisuke

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title

• H01G11/06

  with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] · CPC title

• H01M50/457

  comprising three or more layers · CPC title

• H01G11/12

  Stacked hybrid or EDL capacitors · CPC title