POSITIVE ELECTRODE FOR SECONDARY CELL

• US 20130171521A1
• Filed: 09/16/2011
• Published: 07/04/2013
• Est. Priority Date: 09/16/2010
• Status: Abandoned Application

• Current Assignee: ZEON Corporation
• Original Assignee: ZEON Corporation
• Inventors: Sugimoto, Takumi, Yabuuchi, Yosuke
• Application Number:
  US13/824,285
• Publication Number:
  US 20130171521A1
• Time in Patent Office: Days
• US Class Current: 429/211
• CPC Class Codes: C08L 33/02 Homopolymers or copolymers of acids; Metal or ammonium salts thereof
• CPC Class Codes: C08L 33/20 Homopolymers or copolymers of acrylonitrile C08L55/02 takes precedence
• CPC Class Codes: C08L 85/02 containing phosphorus
• CPC Class Codes: H01M 4/0404 by coating on electrode collectors
• 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 4/1391 of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/62 Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
• CPC Class Codes: H01M 4/622 being polymers
• CPC Class Codes: H01M 4/661 Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: H01M 4/662 Alloys collectors of lead alloys H01M4/685
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A positive electrode for secondary cell comprising a current collector which is comprised of aluminum or an aluminum alloy and a positive electrode active material layer, wherein the positive electrode active material layer contains a positive electrode active material, a water-based binder, an organic phosphonic acid compound, and a polyvalent metal compound is provided. According to the present invention, a positive electrode for secondary cell which is high in initial capacity and excellent in rate characteristics and high temperature cycle characteristics can be provided.

Claims

1. A positive electrode for secondary cell comprising a current collector which is comprised of aluminum or an aluminum alloy and a positive electrode active material layer, wherein

said positive electrode active material layer contains a positive electrode active material, a water-based binder, an organic phosphonic acid compound, and a polyvalent metal compound.

2. The positive electrode for secondary cell as set forth in claim 1, wherein said organic phosphonic acid compound is a polymer compound which has an organic phosphonic acid group.

3. The positive electrode for secondary cell as set forth in claim 1, wherein said organic phosphonic acid compound further has a carboxyl group or sulfonic acid group.

4. The positive electrode for secondary cell as set forth in claim 1, wherein said water-based binder is a nitrile group-containing polymer with an iodine value of 0 mg/100 mg or more and 30 mg/100 mg or less.

5. The positive electrode for secondary cell as set forth in claim 4, wherein said nitrile group-containing polymer is obtained by polymerizing the monomers which form said nitrile group-containing polymer by emulsion polymerization using an emulsifier constituted by a nonionic surfactant.

6. The positive electrode for secondary cell as set forth in claim 1, wherein said polyvalent metal compound is a polyvalent organometallic compound.

7. The positive electrode for secondary cell as set forth in claim 1, wherein said positive electrode active material contains nickel.

8. A secondary cell comprising the positive electrode for secondary cell as set forth in claim 1, a negative electrode, a separator, and an electrolytic solution.

9. A slurry composition for secondary cell positive electrode comprising a positive electrode active material, a water-based binder, water, an organic phosphonic acid compound, and a polyvalent metal compound.

10. A method of production of a positive electrode for secondary cell comprising a step of coating a current collector which is comprised of aluminum or an aluminum alloy by the slurry composition for secondary cell positive electrode as set forth in claim 9 and a step of drying said slurry composition for secondary cell positive electrode.

11. A binder composition comprising a water-based binder which is dispersed in water, an organic phosphonic acid compound, and a polyvalent metal compound.