Manufacturing method of electrode and wet granules

Patent metadata

Field	Value
Publication number	US-2016204434-A1
Application number	US-201614993409-A
Country	US
Kind code	A1
Filing date	Jan 12, 2016
Priority date	Jan 14, 2015
Publication date	Jul 14, 2016
Grant date	—

Abstract

A manufacturing method of an electrode according to the invention includes: a process of forming wet granules by stirring a mixture of an electrode active material, a binding material, and a solvent; and a process of forming an electrode material layer on a current collector by rolling the wet granules. The process of forming the wet granules includes: a process of granulating the electrode active material by stirring the mixture at a first stirring speed; and a process of stirring the granulated electrode active material at a second stirring speed that is faster than the first stirring speed so as to be refined to an average particle size of 400 μm or smaller. A stirring time at the second stirring speed is shorter than a stirring time at the first stirring speed and is shorter than 5 seconds.

First claim

What is claimed is:

1 . A manufacturing method of an electrode comprising:
forming wet granules by stirring a mixture of an electrode active material, a binding material, and a solvent; and forming an electrode material layer on a current collector by rolling the wet granules, wherein when the wet granules are formed, the electrode active material is granulated by stirring the mixture at a first stirring speed, and the granulated electrode active material is stirred at a second stirring speed that is faster than the first stirring speed, so as to be refined to an average particle size of 400 μm or smaller, and a stirring time at the second stirring speed is shorter than a stirring time at the first stirring speed and is shorter than 5 seconds.

2 . The manufacturing method according to claim 1 , wherein
the first stirring speed which is a speed of a tip end of a stirring blade is 10 m/s or lower.

3 . The manufacturing method according to claim 1 , wherein
the second stirring speed which is a speed of a tip end of a stirring blade is 15 m/s or higher.

4 . The manufacturing method according to claim 1 , wherein
the stirring time at the second stirring speed is 3 seconds or shorter.

5 . The manufacturing method according to claim 1 , wherein
a solid content fraction of the wet granules is 70 mass % or higher.

6 . The manufacturing method according to claim 5 , wherein
a ratio of a sum of the binding material and a dispersant in terms of solid content is 3 mass % or lower.

7 . Wet granules comprising:
a positive electrode active material; a binding material; and a solvent, wherein the wet granules are used for forming an electrode material layer through rolling, and have an average particle size of 400 μm or smaller and a bulk density of 0.8 g/mL or lower.

8 . The wet granules according to claim 7 , wherein
a solid content fraction of the wet granules is 70 mass % or higher.

9 . The wet granules according to claim 8 , wherein
a ratio of a sum of the binding material and a dispersant in terms of solid content is 3 mass % or lower.

Assignees

• Toyota Motor Co Ltd

Inventors

• Uezono Tomoyuki
• ENOKIHARA Katsushi

Classifications

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M10/0525

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

• H01M4/505 Primary

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M4/139

  Processes of manufacture · CPC title