LAMINATED BODY

• US 20170365878A1
• Filed: 06/20/2017
• Published: 12/21/2017
• Est. Priority Date: 06/21/2016
• Status: Active Grant

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: OGATA, Toshihiko, MURAKAMI, Chikara
• Granted Patent: US 10,361,458 B2
• Time in Patent Office: Days
• CPC Class Codes: C01P 2002/04 Compounds with a limited amount of crystallinty, e.g. as indicated by a crystallinity index
• CPC Class Codes: C09D 127/16 Homopolymers or copolymers of vinylidene fluoride
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0565 Polymeric materials, e.g. gel-type or solid-type
• CPC Class Codes: H01M 10/4235 Safety or regulating additives or arrangements in electrodes, separators or electrolyte H01M10/4242 takes precedence
• CPC Class Codes: H01M 2004/021 Physical characteristics, e.g. porosity, surface area
• CPC Class Codes: H01M 2300/0017 Non-aqueous electrolytes
• CPC Class Codes: H01M 2300/0094 in the form of layered products, e.g. coatings
• CPC Class Codes: H01M 50/124 having a layered structure
• CPC Class Codes: H01M 50/403 Manufacturing processes of separators, membranes or diaphragms
• CPC Class Codes: H01M 50/406 Moulding; Embossing; Cutting
• CPC Class Codes: H01M 50/417 Polyolefins
• CPC Class Codes: H01M 50/426 Fluorocarbon polymers
• CPC Class Codes: H01M 50/431 Inorganic material
• CPC Class Codes: H01M 50/443 Particulate material
• CPC Class Codes: H01M 50/446 Composite material consisting of a mixture of organic and inorganic materials
• CPC Class Codes: H01M 50/449 having a layered structure
• CPC Class Codes: H01M 50/451 comprising layers of only organic material and layers containing inorganic material
• CPC Class Codes: H01M 50/457 comprising three or more layers
• CPC Class Codes: H01M 50/489 Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
• CPC Class Codes: H01M 50/491 : Porosity
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries

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.

Claims

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<sup>−

1</sup> 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<sup>−

1</sup> 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 μ

m to 10 μ

m.

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.