Separator for non-aqueous secondary battery and non-aqueous secondary battery

Patent metadata

Field	Value
Publication number	US-9799868-B2
Application number	US-201214352489-A
Country	US
Kind code	B2
Filing date	Oct 19, 2012
Priority date	Oct 21, 2011
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

A separator for a non-aqueous secondary battery includes a porous substrate and an adhesive porous layer provided on one or both sides of the porous substrate, the adhesive porous layer including a polyvinylidene-fluoride resin and a filler whose difference between a particle diameter at 90% cumulative volume and a particle diameter at 10% cumulative volume is 2 μm or less, and the adhesive porous layer satisfying Inequality (1): 0.5≦a/r≦3.0, wherein, in Inequality (1), “a” represents an average thickness (μm) of the adhesive porous layer on one of the sides of the porous substrate; and “r” represents a volume average particle diameter (μm) of the filler contained in the adhesive porous layer.

First claim

The invention claimed is:

1. A separator for a non-aqueous secondary battery, comprising:
a porous substrate; and
an adhesive porous layer provided on one or both sides of the porous substrate, the adhesive porous layer comprising:
a polyvinylidene-fluoride resin; and
a filler, a difference between a particle diameter at 90% cumulative volume of the filler and a particle diameter at 10% cumulative volume of the filler being 2 μm or less, and the adhesive porous layer satisfying the following Inequality (1):
0.5≦ a/r≦ 3.0  Inequality (1):

wherein, in Inequality (1), “a” represents an average thickness (μm) of the adhesive porous layer on one of the sides of the porous substrate; and “r” represents a volume average particle diameter (μm) of the filler contained in the adhesive porous layer.

2. The separator for a non-aqueous secondary battery according to claim 1 , wherein a proportion of the filler with respect to a total mass of the polyvinylidene-fluoride resin and the filler in the adhesive porous layer is from 1% by mass to 30% by mass.

3. The separator for a non-aqueous secondary battery according to claim 1 , wherein an average thickness of the adhesive porous layer on one of the sides of the porous substrate is from 0.5 μm to 5 μm.

4. The separator for a non-aqueous secondary battery according to claim 1 , wherein a volume average particle diameter of the filler is from 0.01 μm to 10 μm.

5. A non-aqueous secondary battery, comprising:
a positive electrode;
a negative electrode; and
the separator for a non-aqueous secondary battery according to claim 1 arranged between the positive electrode and the negative electrode,
wherein electromotive force is obtained by lithium doping/dedoping in the non-aqueous secondary battery.

6. The separator for a non-aqueous secondary battery according to claim 1 , wherein:
a proportion of the filler with respect to a total mass of the polyvinylidene-fluoride resin and the filler in the adhesive porous layer is from 1% by mass to 30% by mass;
an average thickness of the adhesive porous layer on one of the sides of the porous substrate is from 0.5 μm to 5 μm; and
a volume average particle diameter of the filler is from 0.01 μm to 10 μm.

7. The non-aqueous secondary battery according to claim 5 , wherein:
a proportion of the filler with respect to a total mass of the polyvinylidene-fluoride resin and the filler in the adhesive porous layer is from 1% by mass to 30% by mass;
an average thickness of the adhesive porous layer on one of the sides of the porous substrate is from 0.5 μm to 5 μm; and
a volume average particle diameter of the filler is from 0.01 μm to 10 μm.

Assignees

• Teijin Ltd

Inventors

• Iwai Ayumi
• Yoshitomi Takashi
• Nishikawa Satoshi

Classifications

• H01M50/461 Primary

  with adhesive layers between electrodes and separators · CPC title

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/426 Primary

  Fluorocarbon polymers · CPC title

• H01M50/489

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title

• H01M50/449

  having a layered structure · CPC title