Slurry composition for non-aqueous secondary battery positive electrode, positive electrode for non-aqueous secondary battery, and non-aqueous secondary battery

Patent metadata

Field	Value
Publication number	US-2019198878-A1
Application number	US-201716331669-A
Country	US
Kind code	A1
Filing date	Sep 8, 2017
Priority date	Sep 20, 2016
Publication date	Jun 27, 2019
Grant date	—

Abstract

Provided is a slurry composition for a non-aqueous secondary battery positive electrode that has excellent stability and enables formation of a positive electrode mixed material layer that causes a non-aqueous secondary battery to display excellent output characteristics. The slurry composition contains a positive electrode active material and a copolymer. The proportion constituted by nickel among transition metal in the positive electrode active material is at least 30.0 mol % and not more than 100.0 mol %. The copolymer includes a nitrile group-containing monomer unit in a proportion of at least 70.0 mass % and not more than 96.0 mass % and a basic group-containing monomer unit in a proportion of at least 0.1 mass % and not more than 5.0 mass %.

First claim

1 . A slurry composition for a non-aqueous secondary battery positive electrode comprising a positive electrode active material and a copolymer, wherein
a proportion constituted by nickel among transition metal in the positive electrode active material is at least 30.0 mol % and not more than 100.0 mol %, and the copolymer includes a nitrile group-containing monomer unit and a basic group-containing monomer unit, percentage content of the nitrile group-containing monomer unit in the copolymer is at least 70.0 mass % and not more than 96.0 mass %, and percentage content of the basic group-containing monomer unit in the copolymer is at least 0.1 mass % and not more than 5.0 mass %.

2 . The slurry composition for a non-aqueous secondary battery positive electrode according to claim 1 , wherein the copolymer further includes an acidic group-containing monomer unit, and percentage content of the acidic group-containing monomer unit in the copolymer is at least 0.1 mass % and not more than 10.0 mass %.

3 . The slurry composition for a non-aqueous secondary battery positive electrode according to claim 1 , wherein the copolymer further includes a (meth)acrylic acid ester monomer unit, and percentage content of the (meth)acrylic acid ester monomer unit in the copolymer is at least 1.0 mass % and not more than 20.0 mass %.

4 . The slurry composition for a non-aqueous secondary battery positive electrode according to claim 1 , wherein the basic group-containing monomer unit is an amide group-containing monomer unit.

5 . The slurry composition for a non-aqueous secondary battery positive electrode according to claim 1 , wherein the positive electrode active material is a lithium-containing composite metal oxide represented by a formula (A1): LiNi a Co b Mn c O 2 , where 0.3≤a≤1.0, 0≤b≤0.5, 0≤c≤0.5, and 0.9≤a+b+c≤1.1, or a formula (A2): LiNi x Co y Al z O 2 , where 0.7≤x≤1.0, 0≤y≤0.3, 0≤z≤0.1, and 0.9≤x+y+z≤1.1.

6 . The slurry composition for a non-aqueous secondary battery positive electrode according to claim 1 , further comprising a conductive material, wherein the conductive material includes conductive carbon fiber.

7 . The slurry composition for a non-aqueous secondary battery positive electrode according to claim 1 , wherein the copolymer has a weight-average molecular weight of at least 100,000 and not more than 1,500,000.

8 . A positive electrode for a non-aqueous secondary battery comprising a positive electrode mixed material layer formed using the slurry composition for a non-aqueous secondary battery positive electrode according to claim 1 .

9 . The positive electrode for a non-aqueous secondary battery according to claim 8 , wherein the positive electrode mixed material layer has a density of at least 2.5 g/cm 3 and not more than 3.8 g/cm 3 .

10 . A non-aqueous secondary battery comprising a positive electrode, a negative electrode, an electrolyte solution, and a separator, wherein the positive electrode is the positive electrode for a non-aqueous secondary battery according to claim 8 .

Assignees

• Zeon Corp

Inventors

• ANNAKA Koji
• Ishii Takuya

Classifications

• H01M4/131 Primary

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

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M4/1391

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

• H01M10/0566

  Liquid materials · CPC title

• C08F2/22

  Emulsion polymerisation · CPC title