Laminated body

Patent metadata

Field	Value
Publication number	US-10361458-B2
Application number	US-201715627671-A
Country	US
Kind code	B2
Filing date	Jun 20, 2017
Priority date	Jun 21, 2016
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

A laminated body includes: a porous base material containing a polyolefin-based resin as a main component; and a porous layer which is disposed on at least one surface of the porous base material and which contains a polyvinylidene fluoride-based resin, the laminated body being arranged so that: a diminution rate of diethyl carbonate dropped on the porous base material is 15 sec/mg to 21 sec/mg; a spot diameter of the diethyl carbonate 10 seconds after the diethyl carbonate was dropped on the porous base material is not less than 20 mm; and the polyvinylidene fluoride-based resin containing crystal form α in an amount of not less than 36 mol % with respect to 100 mol % of a total amount of the crystal form α and crystal form β contained in the polyvinylidene fluoride-based resin. A nonaqueous electrolyte secondary battery separator made of the laminated body is not easily curled.

First claim

The invention claimed is:

1. A laminated body, comprising:
a porous base material containing a polyolefin-based resin as a main component; and
a porous layer which is disposed on at least one surface of the porous base material and which contains a polyvinylidene fluoride-based resin, wherein:
a diminution rate of diethyl carbonate dropped on the porous base material is 15 sec/mg to 21 sec/mg;
a spot diameter of the diethyl carbonate 10 seconds after the diethyl carbonate was dropped on the porous base material is not less than 20 mm; and
the polyvinylidene fluoride-based resin containing crystal form α in an amount of not less than 36 mol % with respect to 100 mol % of a total amount of the crystal form α and crystal form β contained in the polyvinylidene fluoride-based resin,
where the amount of the crystal form α is calculated from an absorption intensity at around 765 cm −1 in an IR spectrum of the porous layer, and an amount of the crystal form β is calculated from an absorption intensity at around 840 cm −1 in the IR spectrum of the porous layer.

2. The laminated body according to claim 1 , wherein
the polyvinylidene fluoride-based resin contains (i) a homopolymer of vinylidene fluoride and/or (ii) a copolymer of vinylidene fluoride and at least one monomer selected from the group consisting of hexafluoropropylene, tetrafluoroethylene, trifluoroethylene, trichloroethylene, and vinyl fluoride.

3. The laminated body according to claim 1 , wherein
the polyvinylidene fluoride-based resin has a weight-average molecular weight of 200,000 to 3,000,000.

4. The laminated body according to claim 1 , wherein
the porous layer contains a filler.

5. The laminated body according to claim 4 , wherein
the filler has a volume-average particle size of 0.01 μm to 10 μm.

6. A nonaqueous electrolyte secondary battery member, comprising:
a cathode;
a laminated body according to claim 1 ; and
an anode,
the cathode, the laminated body, and the anode being arranged in this order.

7. A nonaqueous electrolyte secondary battery, comprising as a separator a laminated body according to claim 1 .

Assignees

• Sumitomo Chemical Co

Inventors

• Ogata Toshihiko
• Murakami Chikara

Classifications

• H01M50/443

  Particulate material · CPC title

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/451

  comprising layers of only organic material and layers containing inorganic material · CPC title

• H01M50/406

  Moulding; Embossing; Cutting · CPC title

• H01M50/417

  Polyolefins · CPC title