Binder composition for non-aqueous secondary battery porous membrane, slurry composition for non-aqueous secondary battery porous membrane, porous membrane for non-aqueous secondary battery, and non-aqueous secondary battery

Patent metadata

Field	Value
Publication number	US-10637063-B2
Application number	US-201616062203-A
Country	US
Kind code	B2
Filing date	Dec 15, 2016
Priority date	Dec 25, 2015
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

A binder composition for a non-aqueous secondary battery porous membrane comprises: a polymer; and an organic solvent, wherein a boiling point of the organic solvent is 30° C. or more and 100° C. or less, and an absolute difference |SP diff |=|SP p −SP s | between a solubility parameter SP p of the polymer and a solubility parameter SP s of the organic solvent is 1.5 or more and 6.0 or less.

First claim

The invention claimed is:

1. A slurry composition for a non-aqueous secondary battery porous membrane, comprising:
a binder composition for a non-aqueous secondary battery porous membrane comprising:
a polymer; and
an organic solvent,
wherein a boiling point of the organic solvent is 30° C. or more and 100° C. or less, and
an absolute difference |SP diff |=|SP p −SP s | between a solubility parameter SP p of the polymer and a solubility parameter SP s of the organic solvent is 1.5 or more and 6.0 or less; and

non-conductive particles satisfying coefficient of variation value of 0.5% to 40%;
wherein a content proportion of the polymer is 15 parts by mass or more and 30 parts by mass or less relative to 100 parts by mass of the non-conductive particles.

2. A porous membrane for a non-aqueous secondary battery formed of a dried product of the slurry composition for a non-aqueous secondary battery porous membrane according to claim 1 .

3. A non-aqueous secondary battery, comprising
the porous membrane for a non-aqueous secondary battery according to claim 2 .

4. The slurry composition for a non-aqueous secondary battery porous membrane according to claim 1 ,
wherein the polymer contains a nitrile group and a straight chain alkylene structural unit having a carbon number of 4 or more, in a same molecule.

5. The slurry composition for a non-aqueous secondary battery porous membrane according to claim 1 ,
wherein a content proportion of a nitrile group in the polymer is 5 mass % or more and 40 mass % or less.

6. The slurry composition for a non-aqueous secondary battery porous membrane according to claim 1 ,
wherein a weight-average molecular weight of the polymer is 50,000 or more and 500,000 or less.

7. The slurry composition for a non-aqueous secondary battery porous membrane according to claim 1 ,
wherein the organic solvent is acetone.

Assignees

• Zeon Corp

Inventors

• Akiike Junnosuke

Classifications

• C01B32/158

  Carbon nanotubes · CPC title

• C08J2309/02

  Copolymers with acrylonitrile · CPC title

• C08L9/02

  Copolymers with acrylonitrile · CPC title

• C08J2207/00

  Foams characterised by their intended use · CPC title

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title