Composite particles for electrochemical device electrode, material for electrochemical device electrode, and electrochemical device electrode

Patent metadata

Field	Value
Publication number	US-9685658-B2
Application number	US-201214232838-A
Country	US
Kind code	B2
Filing date	Jul 13, 2012
Priority date	Jul 15, 2011
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

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.

First claim

The invention claimed is:

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, said water-soluble polymer containing monomer units which contain sulfonic acid groups, monomer units which contain carboxyl groups, and (meth)acrylic acid ester monomer units, wherein:
a ratio of a content of the monomer units which contain sulfonic acid groups in said water-soluble polymer is 2 to 8 wt %,
a ratio of a content of the monomer units which contain carboxyl groups in said water-soluble polymer is 20 to 60 wt %, and
a ratio of a content of the (meth)acrylic acid ester monomer units in said water-soluble polymer is 25 to 78 wt %.

2. 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.

3. 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.

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

5. 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 4 laminated on a current collector.

6. The electrochemical device electrode as set forth in claim 5 , wherein said electrode active material layer is laminated on said current collector by press forming.

7. The electrochemical device electrode as set forth in claim 6 , wherein said electrode active material layer is laminated on said current collector by roll press forming.

8. The composite particles for electrochemical device electrode as set forth in claim 1 , wherein:
said non-water soluble particle-shaped polymer is a diene-based polymer containing conjugated diene monomer units, ethylenically unsaturated carboxylic acid monomer units, and other monomer units which are copolymerizable with the conjugated diene monomer units, and the ethylenically unsaturated carboxylic acid monomer units,
a ratio of a content of the conjugated diene monomer units in the diene-based polymer is 20 to 60 wt %,
a ratio of a content of the ethylenically unsaturated carboxylic acid monomer units in the diene-based polymer is 0.5 to 10 wt %, and
a ratio of a content of the other monomer units in the diene-based polymer is 30 to 79.5 wt %.

9. The composite particles for electrochemical device electrode as set forth in claim 1 , wherein:
said non-water soluble particle-shaped polymer is an acrylate-based polymer containing (meth)acrylic acid ester monomer units, α,β-unsaturated nitrile monomer units, and vinyl monomer units which have an acid ingredient,
a ratio of a content of the (meth)acrylic acid ester monomer units in the acrylate-based polymer is 50 to 95 wt %,
a ratio of a content of the α,β-unsaturated nitrile monomer units in the acrylate-based polymer is 3 to 40 wt %, and
a ratio of a content of the vinyl monomer units in the acrylate-based polymer is 1.0 to 7.0 wt %.

10. The composite particles for electrochemical device electrode as set forth in claim 1 , wherein said water-soluble polymer has a glass transition temperature of 0 to 70° C.

11. The composite particles for electrochemical device electrode as set forth in claim 1 , wherein:
said electrode active material is a positive electrode active material, and
a ratio of said non-water soluble particle-shaped polymer and said water-soluble polymer is, by weight ratio of the non-water soluble particle-shaped polymer/water-soluble polymer, 70/30 to 90/10.

12. The composite particles for electrochemical device electrode as set forth in claim 1 , wherein:
said electrode active material is a negative electrode active material, and
a ratio of said non-water soluble particle-shaped polymer and said water-soluble polymer is, by weight ratio of the non-water soluble particle-shaped polymer/water-soluble polymer, 80/20 to 99.1/0.1.

13. 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.

Assignees

• Matsumura Taku
• Otani Yuko
• Zeon Corp

Inventors

• Matsumura Taku
• Otani Yuko

Classifications

• H01M4/0419

  involving spraying · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/362 Primary

  Composites · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• Y02P70/54

  Cross-Sectional Technologies · mapped topic