Current collector, electrode structure, nonaqueous electrolyte battery, and electricity storage component

Patent metadata

Field	Value
Publication number	US-2016276673-A1
Application number	US-201615170469-A
Country	US
Kind code	A1
Filing date	Jun 1, 2016
Priority date	Apr 4, 2012
Publication date	Sep 22, 2016
Grant date	—

Abstract

A manufacturing method for a current collector includes dispersing and agitating a fluorine-based resin and conductive particles for 5 to 60 minutes at 1000 to 5000 rpm, dispersing and agitating the fluorine-based resin and conductive particles for 10 to 120 minutes at 2000 to 7000 rpm. The resin layer includes a fluorine-based resin and conductive particles, has a thickness of 0.3 to 20 μm. The current collector has one or more of: (1) average diameter of the particles is 0.5 to 25 μm, and a surface occupying ratio of the particles at a surface is 10 to 50%; (2) surface resistance of the resin layer at 20° C. is 1.0 to 10Ω, resistance after heating at 220° C. is 200 to 600Ω, and (3) surface resistance of the resin layer at 20° C. is 1.8 to 9.7Ω, resistance after heating at 180° C. is 209 to 532Ω.

First claim

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1 . A manufacturing method for a current collector having a resin layer on at least one side of a conductive substrate, comprising:
a first dispersing step of agitating a fluorine-based resin and conductive particles for 5 to 60 minutes at the rotation number of 1000 to 5000 rpm; and a second dispersing step of agitating the fluorine-based resin and conductive particles for 10 to 120 minutes at the rotation number of 2000 to 7000 rpm, wherein: the resin layer comprises the fluorine-based resin and conductive particles; the resin layer has a thickness of 0.3 to 20 μm; the current collector satisfies at least one of the following characteristics of the items (1) to (3): (1) average particle diameter of the conductive particles is 0.5 to 25 μm, and a surface occupying ratio of the conductive particles at a surface of the resin layer is 10 to 50%, (2) resistance of the surface of the resin layer at 20° C. is 1.0 to 10Ω, and resistance after heating at 220° C. is 200 to 600Ω, and (3) resistance of the surface of the resin layer at 20° C. is 1.8 to 9.7Ω, and resistance after heating at 180° C. is 209 to 532Ω.

2 . The method of claim 1 , wherein the current collector satisfies the characteristics of item (1).

3 . The method of claim 1 , wherein the current collector satisfies the characteristics of item (2).

4 . The method of claim 1 , wherein the current collector satisfies the characteristics of item (3).

5 . A manufacturing method for a current collector having a resin layer on at least one side of a conductive substrate, comprising:
a first dispersing step of agitating the fluorine-based resin and conductive particles for 5 to 60 minutes at the rotation number of 1000 to 5000 rpm; and a second dispersing step of agitating the fluorine-based resin and conductive particles for 10 to 120 minutes at the rotation number of 2000 to 7000 rpm, wherein: the resin layer comprises a fluorine-based resin and conductive particles having an average particle diameter of 0.5 to 25 μm; the resin layer has a thickness of 0.3 to 20 μm; a surface occupying ratio of the conductive particles at a surface of the resin layer is 10 to 50%.

6 . The method of claim 1 , wherein the fluorine-based resin has a carboxyl group or a carboxylic acid ester group.

7 . The method of claim 1 , wherein the fluorine-based resin comprises polyvinylidene fluoride.

8 . A manufacturing method for an electrode structure comprising a step of providing an active material layer or an electrode material layer on the resin layer of the current collector manufactured using the method of claim 1 .

9 . A manufacturing method for a non-aqueous electrolyte battery or an electrical storage device with the electrode structure manufactured using the method of claim 8 .

10 . The method of claim 9 , wherein a capacity retention rate is 80% or higher.

Assignees

• Uacj Corp
• Uacj Foil Corp

Inventors

• Kato Osamu
• Saito Sohei
• HONKAWA Yukiou
• Wasamoto Mitsuyuki
• Kataoka Tsugio
• Yamabe Satoshi

Classifications

• H01M50/417

  Polyolefins · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2/0237

  Electricity · mapped topic

• H01M10/0568

  characterised by the solutes · CPC title

• H01M2220/20

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