Current collector, electrode structure, battery and capacitor

Patent metadata

Field	Value
Publication number	US-2016042878-A1
Application number	US-201414779554-A
Country	US
Kind code	A1
Filing date	Mar 26, 2014
Priority date	Mar 29, 2013
Publication date	Feb 11, 2016
Grant date	—

Abstract

A current collector with high safety which can realize both of a superior conductivity at normal temperature conditions and a superior shut down function at high temperature conditions, is provided.
A current collector, including a conductive substrate; and a resin layer provided on at least one side of the conductive substrate, is provided. Here, the resin layer is formed with a paste containing an aggregate of polyolefin-based emulsion particles; and a conductive material. Further, the aggregate has an average particle diameter of 0.5 to 5 μm.

First claim

1 . A current collector, comprising:
a conductive substrate; and a resin layer provided on at least one side of the conductive substrate; wherein the resin layer is formed with a paste comprising:
an aggregate of polyolefin-based emulsion particles; and
a conductive material; and
the aggregate has an average particle diameter of 0.5 to 5 μm.

2 . The current collector of claim 1 , wherein a surface of the aggregate is covered with the conductive material by 5 to 90%.

3 . The current collector of claim 1 , wherein the polyolefin-based emulsion particles contain at least one resin selected from the group consisting of a polypropylene resin, a polyethylene resin, a polypropylene copolymer resin, and a polyethylene copolymer resin.

4 . The current collector of claim 1 , further comprising a polymer coagulant and/or a low molecular coagulant.

5 . The current collector of claim 4 , wherein:
the polymer coagulant is at least one polymer having a number average molecular weight of 10×10 4 or more, selected from the group consisting of sodium polyacrylate, urethane modified polyether, and sodium polyacrylate sulfonate; and the low molecular coagulant is at least one low molecular compound having a number average molecular weight of 10×10 3 or less, selected from the group consisting of sodium polyacrylate, urethane modified polyether, and sodium polyacrylate sulfonate.

6 . The current collector of claim 1 , wherein the conductive material comprises carbon powders or metal powders.

7 . The current collector of claim 1 , wherein the conductive substrate is aluminum, aluminum alloy, or copper.

8 . The current collector of claim 1 , wherein an AC impedance Zre measured under 1 Hz when a separator impregnated with an electrolyte solution is sandwiched in between the current collectors having an active material layer provided on the resin layer, the current collectors facing each other, is:
200 Ωcm 2 or lower at 30° C.; and
a maximum resistance is 400 Ωcm 2 or higher at 80 to 165° C.

9 . An electrode structure comprising the current collector of claim 1 .

10 . A battery or a capacitor comprising the electrode structure of claim 9 .

Assignees

• Uacj Corp
• Uacj Foil Corp
• Furukawa Electric Co Ltd

Inventors

• Kato Osamu
• Saito Sohei
• HONKAWA Yukiou
• Yaegashi Tatsuhiro
• Kataoka Tsugio
• Inoue Mitsuya
• Yamabe Satoshi
• Morishima Yasumasa
• Ito Takayori
• Hara Hidekazu
• Iida Takahiro

Classifications

• H01M4/622

  being polymers · CPC title

• H01G11/50

  specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation · CPC title

• H01G11/28 Primary

  arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives · CPC title

• H01G11/52

  Separators · CPC title

• H01G11/42

  Powders or particles, e.g. composition thereof · CPC title