Method of manufacturing electrode

Patent metadata

Field	Value
Publication number	US-12500221-B2
Application number	US-202217932746-A
Country	US
Kind code	B2
Filing date	Sep 16, 2022
Priority date	Nov 29, 2021
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

A method of manufacturing an electrode includes a step of preparing a granulated material containing an electrode active material, a binder, and a solvent, a step of compressing the granulated material between a pair of rolls, to form an electrode composite layer, and a step of placing the electrode composite layer on an electrode current collector. At least one of the pair of rolls has a temperature of 40° C. or higher.

First claim

What is claimed is:

1 . A method of manufacturing an electrode operatively associated with an apparatus, the method comprising:
preparing a granulated material containing an electrode active material, a binder, and a solvent; heating a first roll, a second roll, and a third roll of the apparatus to a temperature equal to or higher than 40° C.; compressing the granulated material between the first roll and the second roll; forming an electrode composite layer; conveying an electrode current collector on the third roll; and pressing the electrode composite layer, onto the electrode current collector conveyed on the third roll.

2 . The method according to claim 1 , wherein the granulated material has a solid content percentage that is equal to or greater than 75 mass % and equal to or less than 90 mass %.

3 . The method according to claim 1 , further comprising adjusting a rotational speed of the second roll faster than a rotational speed of the first roll during compressing the granulated material between the first roll and the second roll.

4 . The method according to claim 1 , further comprising pressing the electrode composite layer onto the electrode current collector conveyed on the third roll, by passing the electrode composite layer through a first gap between the second roll and the third roll.

5 . The method according to claim 4 , further comprising:
compressing the granulated material between the first roll and the second roll, by passing the granulated material containing through a second gap between the first roll and the second roll; and preparing the first roll, the second roll, and the third roll such that the first gap is 20 μm, and the second gap is 50 μm.

6 . The method according to claim 1 , further comprising preparing the electrode active material having an average particle diameter of 1 to 25 μm.

7 . The method according to claim 1 , further comprising preparing the first roll, the second roll, and the third roll, each having a diameter of 10 to 1000 mm and an axial length of 100 to 2000 mm.

8 . The method according to claim 1 , further comprising heating the first roll, the second roll, and the third roll to a temperature equal to or lower than 100° C.

9 . The method according to claim 1 , further comprising mixing water and a polar organic solvent to prepare the solvent.

10 . The method according to claim 1 , further comprising preparing the electrode active material including lithium metal oxides.

11 . The method according to claim 1 , further comprising preparing the binder including carboxymethyl cellulose, styrene butadiene rubber, polyvinylidene fluoride, polytetrafluoroethylene, and polyacrylic acid.

12 . The method according to claim 1 , further comprising
preparing the electrode active material having an average particle diameter of 1 to 25 μm; preparing the first roll, the second roll, and the third roll, each having a diameter of 10 to 1000 mm and an axial length of 100 to 2000 mm; heating the first roll, the second roll, and the third roll to a temperature equal to or lower than 100° C.; mixing water and a polar organic solvent to prepare the solvent; preparing the electrode active material including lithium metal oxides; preparing the binder including carboxymethyl cellulose, styrene butadiene rubber, polyvinylidene fluoride, polytetrafluoroethylene, and polyacrylic acid; pressing the electrode composite layer onto the electrode current collector conveyed on the third roll, by passing the electrode composite layer through a first gap between the second roll and the third roll; compressing the granulated material between the first roll and the second roll, by passing the granulated material containing through a second gap between the first roll and the second roll; and preparing the first roll, the second roll, and the third roll such that the first gap is 20 μm, and the second gap is 50 μm.

Assignees

• Toyota Motor Co Ltd

Inventors

• Ikeda Takenori
• Moriyama Satoshi
• Daikuhara Shugo
• Kondo Takeshi
• Tasaki Tomoyuki
• Abe Tomokuni

Classifications

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M4/043

  involving compressing or compaction · CPC title

• H01M4/0433 Primary

  Molding · CPC title

• H01M4/0409

  by a doctor blade method, slip-casting or roller coating · CPC title

• H01M2004/021

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