ELECTROCHEMICAL DEVICE ELECTRODE AND METHOD FOR MANUFACTURING ELECTROCHEMICAL DEVICE ELECTRODE

• US 20170352866A1
• Filed: 03/27/2017
• Published: 12/07/2017
• Est. Priority Date: 06/02/2016
• Status: Active Grant

• Current Assignee: Taiyo Yuden Company Limited (Taiyo Yuden Co)
• Original Assignee: Taiyo Yuden Company Limited (Taiyo Yuden Co)
• Inventors: KAWAI, Yuki
• Granted Patent: US 10,439,199 B2
• Time in Patent Office: Days
• CPC Class Codes: C23C 22/66 Treatment of aluminium or alloys based thereon
• CPC Class Codes: H01G 11/28 arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives
• CPC Class Codes: H01G 11/46 Metal oxides
• CPC Class Codes: H01G 11/68 characterised by their material
• CPC Class Codes: H01G 11/70 characterised by their structure
• CPC Class Codes: H01G 9/0032 formation of the dielectric layer
• CPC Class Codes: H01G 9/045 based on aluminium
• CPC Class Codes: H01G 9/055 Etched foil electrodes
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 2004/021 Physical characteristics, e.g. porosity, surface area
• CPC Class Codes: H01M 4/0404 by coating on electrode collectors
• CPC Class Codes: H01M 4/0416 involving impregnation with a solution, dispersion, paste or dry powder H01M4/0438 takes precedence
• CPC Class Codes: H01M 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/139 Processes of manufacture
• CPC Class Codes: H01M 4/1391 of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/661 Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

An electrochemical device electrode pertaining to one mode of the present invention has a current collector, an aluminum oxide layer, a conductive layer, and an active material layer. The current collector is an aluminum foil. The aluminum oxide layer is formed on a principle surface of the current collector and contains aluminum hydroxide and aluminum oxide. The conductive layer is formed on the aluminum oxide layer and contains conductive material, while the active material layer is formed on the conductive layer.

Claims

1. An electrochemical device electrode, comprising:

a current collector which is an aluminum foil;

an aluminum oxide layer which is formed on and in contact with a principle surface of the current collector and contains aluminum hydroxide and aluminum oxide;

a conductive layer which is formed on and in contact with the aluminum oxide layer and contains conductive material; and

an active material layer which is formed on and in contact with the conductive layer.

2. The electrochemical device electrode according to claim 1, wherein, according to an infrared absorption spectrum of the aluminum oxide layer with a wave number of 1300 cm⁻

1 or less, an absorption peak due to the aluminum oxide is at least twice as high as, but no higher than six times, an absorption peak due to the aluminum hydroxide.

3. The electrochemical device electrode according to claim 1, wherein the aluminum oxide layer has a thickness of 1 nm or more but no more than 2 μ

m.

4. The electrochemical device electrode according to claim 2, wherein the aluminum oxide layer has a thickness of 1 nm or more but no more than 2 μ

m.

5. The electrochemical device electrode according to claim 1, wherein the aluminum oxide layer is porous.

6. The electrochemical device electrode according to claim 2, wherein the aluminum oxide layer is porous.

7. The electrochemical device electrode according to claim 3, wherein the aluminum oxide layer is porous.

8. The electrochemical device electrode according to claim 4, wherein the aluminum oxide layer is porous.

9. A method for manufacturing an electrochemical device electrode, characterized by comprising:

applying a treatment for improving a reactivity of a principle surface of a current collector being an aluminum foil;

causing an alkaline solution to come in contact with the principle surface of the current collector, to form an aluminum oxide layer containing aluminum hydroxide and aluminum oxide on the principle surface of the current collector;

applying a conductive material on a principle surface of the aluminum oxide layer, and then drying the conductive material, to form a conductive layer on the principle surface of the aluminum oxide layer; and

forming an active material layer on a principle surface of the conductive layer.

10. A method for manufacturing an electrochemical device electrode according to claim 9, wherein the aluminum oxide layer is formed as a result of aqueous alkaline solution in which carboxyl salt is dissolved, coming in contact with the current collector.

11. A method for manufacturing an electrochemical device electrode according to claim 9, wherein, for the conductive material, aqueous liquid in which conductive substance is dispersed is used.

12. A method for manufacturing an electrochemical device electrode according to claim 10, wherein, for the conductive material, aqueous liquid in which conductive substance is dispersed is used.