COMPOSITE PARTICLES FOR ELECTROCHEMICAL DEVICE ELECTRODE, MATERIAL FOR ELECTROCHEMICAL DEVICE ELECTRODE, AND ELECTROCHEMICAL DEVICE ELECTRODE

• US 20140170486A1
• Filed: 07/13/2012
• Published: 06/19/2014
• Est. Priority Date: 07/15/2011
• Status: Active Grant

• Current Assignee: ZEON Corporation
• Original Assignee: ZEON Corporation
• Inventors: Otani, Yuko, Matsumura, Taku
• Granted Patent: US 9,685,658 B2
• Time in Patent Office: Days
• US Class Current: 429/211
• CPC Class Codes: H01M 4/0419 involving spraying
• CPC Class Codes: H01M 4/0435 Rolling or calendering
• 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 4/139 Processes of manufacture
• CPC Class Codes: H01M 4/362 Composites
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: H01M 4/622 being polymers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

Composite particles for electrochemical device electrode which contain an electrode active material, a non-water soluble particle-shaped polymer, and a water-soluble polymer having a sulfonic acid group are provided. According to the present invention, composite particles for electrochemical device electrode are high in fluidity, exhibit high adhesion with a current collector, and can provide an electrochemical device electrode which is high in initial capacity, low in internal resistance, an excellent in high temperature storage characteristics are provided.

Claims

1. Composite particles for electrochemical device electrode containing an electrode active material, a non-water soluble particle-shaped polymer, and a water-soluble polymer having a sulfonic acid group.

2. The composite particles for electrochemical device electrode as set forth in claim 1, wherein said water-soluble polymer further contains monomer units which contain carboxyl groups.

3. The composite particles for electrochemical device electrode as set forth in claim 1, wherein said electrode active material is a positive electrode active material which contains nickel.

4. The composite particles for electrochemical device electrode as set forth in claim 1, wherein said electrode active material is a flake-shaped electrode active material.

5. The composite particles for electrochemical device electrode as set forth in claim 1, wherein said water-soluble polymer is a water-soluble polymer having monomer units which contain sulfonic acid groups and a ratio of content of said monomer units which contain sulfonic acid groups in said water-soluble polymer is 2 to 15 wt %.

6. The composite particles for electrochemical device electrode as set forth in claim 2, wherein a ratio of content of the monomer units which contain carboxyl groups in said water-soluble polymer is 20 to 60 wt %.

7. The composite particles for electrochemical device electrode as set forth in claim 1, wherein said water-soluble polymer further contains (meth)acrylic acid ester monomer units.

8. A material for electrochemical device electrode including the composite particles for electrochemical device electrode as set forth in claim 1.

9. An electrochemical device electrode comprising an electrode active material layer which is formed by using the material for electrochemical device electrode as set forth in claim 8 laminated on a current collector.

10. The electrochemical device electrode as set forth in claim 9, wherein said electrode active material layer is laminated on said current collector by press forming.

11. The electrochemical device electrode as set forth in claim 10, wherein said electrode active material layer is laminated on said current collector by roll press forming.

12. A method of production of the composite particles for electrochemical device electrode as set forth in claim 1, comprising a step of making said electrode active material, said non-water soluble particle-shaped polymer, and said water-soluble polymer disperse in water to obtain a slurry and a step of spraying and drying said slurry to form granules.