US 9,437,856 B2 · Secondary battery porous membrane, slurry for secondary battery porous membrane, and secondary battery

Abstract

To provide a secondary battery porous membrane that has superior heat resistance and flexibility and contributes to improvements in battery cycle characteristics. Also provided is a secondary battery having high cycle characteristics that uses this porous membrane. [Solution] This secondary battery porous membrane contains nonconductive particles and a binder. The binder is characterized by being formed from a polymer containing a nitrile group, a novel group, and a C4+ straight-chain alkylene structural unit in the same molecule and the nitrile group content in the polymer constituting the binder being 1-25% by mass, with the iodine value of the polymer being 0 mg/100 mg-30 mg/100 mg.

Claims15

Dependent claims

A secondary battery porous membrane comprising a non-conductive particle and a binder;

wherein
said binder comprises a polymer including a nitrile group, a hydrophilic group and a linear alkylene structural unit having carbon atoms of 4 or more in a same molecule,
a content ratio of said nitrile group in the polymer constituting said binder is 1 to 25 wt % and an iodine value of said polymer is 0 mg/100 mg or more and 30 mg/100 mg or less, and
a content ratio of said hydrophilic group in the polymer constituting said binder is 1 to 6 wt %.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

13/882,029Filed 28 Oct 2011

Priority

JP 2010-24227428 Oct 2010

Published

US 2013/0266873 A110 Oct 2013

Granted

6 Sep 2016

Term ends

Not estimatedThe source records don’t support an estimate.

Classification13 codes

H01M 50/403
Separators; Membranes; Diaphragms; Spacing elements inside cells: manufacturing processes of separators, membranes or diaphragms
H01M 50/417
Synthetic resins, e.g. thermoplastics or thermosetting resins: polyolefins
H01M 50/42
Synthetic resins, e.g. thermoplastics or thermosetting resins: acrylic resins
H01M 50/446
Separators, membranes or diaphragms characterised by the material: composite material consisting of a mixture of organic and inorganic materials

Secondary battery porous membrane, slurry for secondary battery porous membrane, and secondary battery

Life of this patent

Secondary battery porous membrane, slurry for secondary battery porous membrane, and secondary battery

Life of this patent

Abstract

Claims15