Separator for non-aqueous secondary battery, method for manufacturing the same, and non-aqueous secondary battery

Patent metadata

Field	Value
Publication number	US-9887406-B2
Application number	US-201314381376-A
Country	US
Kind code	B2
Filing date	Feb 25, 2013
Priority date	Mar 9, 2012
Publication date	Feb 6, 2018
Grant date	Feb 6, 2018

Abstract

The present invention provides a separator for a non-aqueous secondary battery including a porous substrate and an adhesive layer that is formed on one side or both sides of the porous substrate and is an aggregate layer of particles that include a polyvinylidene fluoride resin, the adhesive layer further including a filler that includes at least one of an organic compound or an inorganic compound, the content of the filler being from 20% by mass to 80% by mass, with respect to the total mass of the mass of the particles and the mass of the filler, and the content of the particles per one adhesive layer being from 0.1 g/m 2 to 6.0 g/m 2 .

First claim

The invention claimed is:

1. A separator for a non-aqueous secondary battery, comprising:
a porous substrate, and
an adhesive layer that is formed on one side or both sides of the porous substrate and is an aggregate layer of particles, the particles including polyvinylidene fluoride resin,
the adhesive layer further including a filler that includes at least one of an organic compound or an inorganic compound,
a content of the filler being from 15% by volume to 90% by volume with respect to a total volume of a volume of the particles and a volume of the filler, and
a content of the particles per one adhesive layer being from 0.4 g/m 2 to 0.95 g/m 2 .

2. The separator for a non-aqueous secondary battery according to claim 1 having a Gurley value of 300 sec/100 cc or less.

3. The separator for a non-aqueous secondary battery according to claim 1 , wherein an average particle diameter of the particles is from 0.01 μm to 1 μm.

4. The separator for a non-aqueous secondary battery according to claim 1 , wherein the polyvinylidene fluoride resin is a copolymer that includes structural units derived from vinylidene fluoride in an amount of 50 mol % or more with respect to all structural units.

5. The separator for a non-aqueous secondary battery according to claim 1 , wherein the organic compound is one or more resins selected from the group consisting of a crosslinked polyacrylic acid, a crosslinked polyacrylic acid ester, a crosslinked polymethacrylic acid, a crosslinked polymethacrylic acid ester, a crosslinked polymethyl methacrylate and a crosslinked polysilicone.

6. The separator for a non-aqueous secondary battery according to claim 1 , wherein the inorganic compound is at least one of a metal hydroxide or a metal oxide.

7. A method for manufacturing a separator for a non-aqueous secondary battery according to claim 1 , the method comprising:
coating, on one side or both sides of the porous substrate, a water-based dispersion, the water-based dispersion including
the particles that include a polyvinylidene fluoride resin and
the filler that includes at least one of an organic compound or an inorganic compound, and

drying the coated water-based dispersion.

8. 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 , which is disposed between the positive electrode and the negative electrode,
wherein, in the non-aqueous secondary battery, electromotive force is obtained by lithium doping/dedoping.

Assignees

• Teijin Ltd

Inventors

• Honda Susumu
• Nishikawa Satoshi

Classifications

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/406

  Moulding; Embossing; Cutting · 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

• H01M50/414

  Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title