Battery and method for producing battery

Patent metadata

Field	Value
Publication number	US-2025140870-A1
Application number	US-202418910297-A
Country	US
Kind code	A1
Filing date	Oct 9, 2024
Priority date	Oct 26, 2023
Publication date	May 1, 2025
Grant date	—

Abstract

A main object of the present disclosure is to provide a battery of which degrade in discharge properties caused by an anode current collector (Al current collector) is inhibited. The present disclosure achieves the object by providing a battery including a cathode, an anode, and an electrolyte layer arranged between the cathode and the anode, wherein the anode includes an anode current collector that is an Al current collector, and an anode active material layer containing an anode active material of which reaction potential is lower than that of Al; and the anode current collector is covered with a resin coating layer containing a resin and a conductive material, and further, an intermediate layer containing the resin and the anode active material is arranged between the resin coating layer and the anode active material layer.

First claim

What is claimed is:

1 . A battery comprising a cathode, an anode, and an electrolyte layer arranged between the cathode and the anode, wherein
the anode includes an anode current collector that is an Al current collector, and an anode active material layer containing an anode active material of which reaction potential is lower than the reaction potential of Al; and the anode current collector is covered with a resin coating layer containing a resin and a conductive material, and further, an intermediate layer containing the resin and the anode active material is arranged between the resin coating layer and the anode active material layer.

2 . A battery comprising a cathode, an anode, and an electrolyte layer arranged between the cathode and the anode, wherein
the anode includes an anode current collector that is an Al current collector, and an anode active material layer containing an anode active material of which reaction potential is lower than the reaction potential of Al; and the anode active material layer is a layer containing a resin, and is a concentration gradient layer of which concentration of the resin increases from the electrolyte layer towards the anode current collector side.

3 . The battery according to claim 1 , wherein the resin is a thermoplastic resin.

4 . The battery according to claim 1 , wherein a reaction potential of the anode active material is 0.3 V (Li + /Li) or less.

5 . The battery according to claim 1 , comprising a Si-based active material or a carbon-based active material as the anode active material.

6 . The battery according to claim 5 , comprising the Si-based active material as the anode active material.

7 . The battery according to claim 1 , wherein the electrolyte layer is a solid electrolyte layer containing a solid electrolyte.

8 . The battery according to claim 1 , wherein the resin coating layer does not contain the anode active material.

9 . The battery according to claim 1 , wherein a rate of a thickness of the intermediate layer with respect to a total thickness of the anode active material layer, the intermediate layer and the resin coating layer is 0.80% or more.

10 . The battery according to claim 1 , wherein a rate of a thickness of the intermediate layer with respect to a total thickness of the anode active material layer, the intermediate layer and the resin coating layer is 7.0% or less.

11 . The battery according to claim 1 , wherein a thickness of the resin coating layer is 10 μm or less.

12 . A method for producing the battery according to claim 1 , the method comprising:
a layered body forming step of obtaining a layered body including layers in the order of the Al current collector, the resin coating layer, and the anode active material layer in a thickness direction; and a pressing step of applying a pressing pressure to the layered body in the thickness direction to form the intermediate layer.

13 . A method for producing the battery according to claim 2 , the method comprising:
a concentration gradient layer forming step of forming the concentration gradient layer on one surface of the Al current collector in a thickness direction.

Assignees

• Toyota Motor Co Ltd
• Aisan Ind

Inventors

• Nishimura Hideaki
• Mizuno Fuminori
• Waseda Tetsuya
• Kawakami Masatsugu
• Matsuyama Takuya
• Masumura Kento
• Suzuki Tomotaka
• Yokochi Tsuneyuki
• Nakabayashi Yukihiro
• Makino Katsuhiko
• Kaga Masaki
• Takemoto Tomoyuki

Classifications

• H01M10/058

  Construction or manufacture · CPC title

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M4/667

  in the form of layers, e.g. coatings · CPC title

• H01M4/64

  Carriers or collectors · CPC title

• H01M10/0525 Primary

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