Current collector, electrode structure, nonaqueous electrolyte battery, electrical storage device, and nitrocellulose resin material

Patent metadata

Field	Value
Publication number	US-9911546-B2
Application number	US-201114235750-A
Country	US
Kind code	B2
Filing date	Jul 29, 2011
Priority date	Jul 29, 2011
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

A current collector which is suitable for discharging and charging at a large current density is provided. The present invention provides a current collector including a conductive substrate and a conductive resin layer provided on one side or both sides of the conductive substrate. The conductive resin layer contains a soluble nitrocellulose-based resin and a conductive material.

First claim

The invention claimed is:

1. A positive electrode structure of lithium ion battery, comprising:
a conductive substrate,
a conductive resin layer provided on one side or both sides of the conductive substrate; and
an active material comprising lithium metal oxide;
wherein
the conductive resin layer contains a soluble nitrocellulose-based resin and a conductive material, wherein
the soluble nitrocellulose-based resin comprises a soluble nitrocellulose, wherein a nitrogen concentration of the soluble nitrocellulose is 10 to 13%, and at least one resin selected from the group consisting of a melamine-based resin, an acryl-based resin, a polyacetal-based resin, and an epoxy-based resin, and
the soluble nitrocellulose is contained by 40 to 90 mass % when the total of the at least one resin and the soluble nitrocellulose is 100 mass %.

2. The positive electrode structure of claim 1 , wherein the soluble nitrocellulose-based resin comprises the melamine-based resin, the soluble nitrocellulose, and at least one resin selected from the group consisting of the acryl-based resin and the polyacetal-based resin.

3. The positive electrode structure of claim 2 , wherein the melamine-based resin is-contained by 5 to 55 mass %.

4. The positive electrode structure of claim 1 , wherein a surface of the conductive resin layer has a water contact angle of 80 degrees to 125 degrees when measured by θ/2 method in a thermostatic chamber at 23° C.

5. The positive electrode structure of claim 4 , wherein the water contact angle is 90 degrees to 110 degrees.

6. The positive electrode structure of claim 1 , further comprising: an active material layer provided on the conductive resin layer.

7. The positive electrode structure of claim 1 , wherein the conductive resin layer contains the active material.

8. A lithium ion battery, comprising the positive electrode structure of claim 1 .

Assignees

• Kato Osamu
• Saito Sohei
• HONKAWA Yukiou
• Wasamoto Mitsuyuki
• Kadowaki Kenichi
• Kataoka Tsugio
• Uacj Corp
• Uacj Foil Corp

Inventors

• Kato Osamu
• Saito Sohei
• HONKAWA Yukiou
• Wasamoto Mitsuyuki
• Kadowaki Kenichi
• Kataoka Tsugio

Classifications

• H01M4/667

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

• H01M4/661

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

• H01G11/28

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

• H01B1/122

  Ionic conductors · CPC title

• H01M10/0525

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