Method for producing electrode

Patent metadata

Field	Value
Publication number	US-12027689-B2
Application number	US-202217817407-A
Country	US
Kind code	B2
Filing date	Aug 4, 2022
Priority date	Sep 2, 2021
Publication date	Jul 2, 2024
Grant date	Jul 2, 2024

Abstract

A main object of the present disclosure is to provide a method for producing an electrode of which uncoated part can stretch while inhibiting breakage. The present disclosure achieves the object by providing a method for producing an electrode, the method including: a preparing step of preparing a precursor sheet including a metal foil, and a coated part and an uncoated part, arranged on the metal foil; a coated part pressing step of pressing the coated part in a thickness direction; and an uncoated part pressing step of pressing the uncoated part in the thickness direction, before or after the coated part pressing step; wherein the coated part contains an electrode material including at least an active material; the uncoated part does not contain the electrode material, and is arranged in an edge of the coated part; and in the uncoated part pressing step, the uncoated part is roll-pressed by a pair of an elastic roll including a shaft body and an elastic body covering the shaft body, while the uncoated part is pushed against the thickness direction.

First claim

What is claimed is:

1. A method for producing an electrode, the method comprising:
a preparing step of preparing a precursor sheet including a metal foil, and a coated part and an uncoated part, arranged on the metal foil;
a coated part pressing step of pressing the coated part in a thickness direction; and
an uncoated part pressing step of pressing the uncoated part in the thickness direction, before or after the coated part pressing step; wherein
the coated part contains an electrode material including at least an active material;
the uncoated part does not contain the electrode material, and is arranged in an edge of the coated part; and
in the uncoated part pressing step, the uncoated part is roll-pressed by a pair of elastic rolls arranged in a thickness direction, and is stretched without breakage;
each elastic roll comprises a shaft body and an elastic body covering the shaft body;
the uncoated part is pushed by the pair of elastic bodies during the roll pressing;
a compression Young's modulus of the elastic body is 11.1 MPa or more and 86.1 MPa or less;
a thickness of the elastic body is 1 mm or more an 10 mm or less;
an elongation of the uncoated part by the roll pressing is 1.5% or more and 15.8% or less; and
the uncoated part pressing step is performed while applying a tensile force of 30N or more and 100N or less.

2. The method for producing the electrode according to claim 1 , wherein the compression Young's modulus of the elastic body is 20 MPa or more.

3. The method for producing the electrode according to claim 1 , wherein, when T 1 designates a thickness of the elastic body and T 2 designates a thickness of the coated part, T 1 /T 2 is 4 or more and 33.3 or less.

Assignees

• Toyota Motor Co Ltd

Inventors

• Hirukawa Tomofumi
• Haga Kengo

Classifications

• H01M4/0404 Primary

  by coating on electrode collectors · CPC title

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M10/0525

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