Current collector, battery and methods for producing the same

Patent metadata

Field	Value
Publication number	US-2017301921-A1
Application number	US-201715482893-A
Country	US
Kind code	A1
Filing date	Apr 10, 2017
Priority date	Apr 14, 2016
Publication date	Oct 19, 2017
Grant date	—

Abstract

A current collector in which, even in the case of using a copper substrate, an electroconductive layer comprising a thermoplastic resin and an electroconductive material and covering the copper substrate provides the same positive temperature coefficient resistance function as the case of using an aluminum substrate. The current collector may comprise: a copper substrate comprising a copper oxide layer that an average content of an oxygen element present within a thickness of 1.0 μm or less from a surface of the copper substrate, is 10.5 at % or more, and a positive temperature coefficient resistance layer comprising a thermoplastic resin and an electroconductive material and covering the copper oxide layer of the copper substrate.

First claim

1 . A current collector comprising:
a copper substrate comprising a copper oxide layer that an average content of an oxygen element present within a thickness of 1.0 μm or less from a surface of the copper substrate, is 10.5 at % or more, and a positive temperature coefficient resistance layer comprising a thermoplastic resin and an electroconductive material and covering the copper oxide layer of the copper substrate.

2 . The current collector according to claim 1 , wherein the average content of the oxygen element is 50 at % or less.

3 . A battery comprising an anode current collector, which is the current collector defined by claim 1 , an anode mixture layer, an electrolyte layer, a cathode mixture layer and a cathode current collector, wherein the positive temperature coefficient resistance layer of the anode current collector and the anode mixture layer are in contact with each other.

4 . A method for producing the current collector defined by claim 1 , the method comprising:
oxidizing a copper substrate by heat-treating the copper substrate at 160° C. or more in a presence of an oxidizing gas, and covering the oxidized copper substrate with a positive temperature coefficient resistance layer comprising a thermoplastic resin and an electroconductive material.

5 . The method for producing the current collector according to claim 4 , wherein, in the oxidizing of the copper substrate, the copper substrate is heat-treated at 160° C. or more for one or more hours under an air atmosphere.

6 . A method for producing a battery comprising an anode current collector, an anode mixture layer, an electrolyte layer, a cathode mixture layer and a cathode current collector, the method comprising:
attaching the anode current collector, which is the current collector defined by claim 1 , and the anode mixture layer so that the positive temperature coefficient resistance layer of the anode current collector and the anode mixture layer are in contact with each other, attaching the anode mixture layer and the electrolyte layer, attaching the electrolyte layer and the cathode mixture layer, and attaching the cathode mixture layer and the cathode current collector.

Assignees

• Toyota Motor Co Ltd

Inventors

• Ebisuzaki Hideyo
• Oguma Yasumasa

Classifications

• H01M4/668

  Composites of electroconductive material and synthetic resins · CPC title

• H01M4/661 Primary

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

• C23C8/10

  Oxidising · CPC title

• H01M4/667 Primary

  in the form of layers, e.g. coatings · CPC title

• H01M4/666 Primary

  in the form of mixed materials (H01M4/668 takes precedence) · CPC title