Slurry for lithium ion secondary battery positive electrode-use, method for producing slurry for lithium ion secondary battery positive electrode-use, method for producing positive electrode for lithium ion secondary battery-use, and lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-10566628-B2
Application number	US-201515128527-A
Country	US
Kind code	B2
Filing date	Apr 2, 2015
Priority date	Apr 2, 2014
Publication date	Feb 18, 2020
Grant date	Feb 18, 2020

Abstract

Provided is a slurry for lithium ion secondary battery positive electrode-use that includes a positive electrode active material, a binding material, a conductive material, and an organic solvent. The positive electrode active material is a lithium cobalt-based composite oxide particle having an oxide of at least one metal selected from the group consisting of Mg, Ca, Al, B, Ti, and Zr on its surface. The binding material includes a polymer (P1) and a fluorine-containing polymer (P2). The polymer (P1) includes a nitrile group-containing monomer unit, a (meth)acrylic acid ester monomer unit, and an alkylene structural unit having a carbon number of at least 4, and does not substantially include a hydrophilic group-containing monomer unit.

First claim

The invention claimed is:

1. A slurry for lithium ion secondary battery positive electrode-use comprising
a positive electrode active material, a binding material, a conductive material, and an organic solvent, wherein
the positive electrode active material is a lithium cobalt-based composite oxide particle having an oxide of at least one metal selected from the group consisting of Mg, Ca, Al, B, Ti, and Zr on its surface,
the binding material includes a polymer (P1) and a fluorine-containing polymer (P2),
the polymer (P1) includes a nitrile group-containing monomer unit, a (meth)acrylic acid ester monomer unit, and an alkylene structural unit having a carbon number of at least 4,
the alkylene structural unit is hydrogenated unit of conjugated diene derived monomer unit or 1-olefin monomer unit,
the polymer (P1) includes 0 mass % or greater and less than 0.05 mass % of a hydrophilic group-containing monomer unit, and
the hydrophilic group-containing monomer unit includes at least one of a carboxylic acid group-containing monomer unit, a sulfonate group-containing monomer unit, a phosphate group-contaning monomer unit, and a hydroxy group-containing monomer unit, and
the polymer (P1) includes 2 mass % or greater and 50 mass % or less of the nitrile group-containing monomer unit, 10 mass % or greater and 40 mass % or less of the (meth)acrylic acid ester monomer unit, and 30 mass % or greater and 80 mass % or less of the alkylene structural unit having the carbon number of at least 4.

2. The slurry for lithium ion secondary battery positive electrode-use of claim 1 , wherein
the conductive material has a specific surface area of at least 700 m 2 /g.

3. The slurry for lithium ion secondary battery positive electrode-use of claim 1 , having a viscosity of from 1,500 mPa·s to 8,000 mPa·s.

4. The slurry for lithium ion secondary battery positive electrode-use of claim 1 , having a solid content concentration of from 75 mass % to 82 mass %.

5. The slurry for lithium ion secondary battery positive electrode-use of claim 1 , wherein
the conductive material is Ketjenblack.

6. The slurry for lithium ion secondary battery positive electrode-use of claim 1 , wherein the polymer (P1) has an iodine value of at least 3 mg/100 mg and no greater than 60 mg/100 mg.

Assignees

• Zeon Corp

Inventors

• Tanaka Keiichiro

Classifications

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/043

  involving compressing or compaction · CPC title

• H01M4/131 Primary

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• C08F236/06

  Butadiene · CPC title