POROUS LAYER, LAMINATED BODY, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY MEMBER INCLUDING THE POROUS LAYER, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY INCLUDING THE POROUS LAYER

• US 20170098809A1
• Filed: 09/30/2016
• Published: 04/06/2017
• Est. Priority Date: 10/02/2015
• Status: Active Grant

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: OGATA, Toshihiko, MURAKAMI, Chikara
• Granted Patent: US 9,991,489 B2
• Time in Patent Office: Days
• CPC Class Codes: C08J 2323/06 Polyethene
• CPC Class Codes: C08J 2427/16 Homopolymers or copolymers of vinylidene fluoride
• CPC Class Codes: C08J 7/0427 with only one layer of a composition containing a polymer binder with more layers C08J7/042
• CPC Class Codes: C08J 7/043 Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 50/417 Polyolefins
• CPC Class Codes: H01M 50/426 Fluorocarbon polymers
• 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: Y02E 60/10 Energy storage using batteries

Abstract

The present invention provides, as a porous layer that can be used for a member for a non aqueous secondary battery having excellent shutdown characteristics, a porous layer including a polyvinylidene fluoride-based resin, wherein, assuming that a sum of individual amounts of crystal form α and crystal form β contained in the polyvinylidene; fluoride-based resin is 100 mol %, the amount of crystal form α contained in the polyvinylidene fluoride-based resin is not less than 10 mol % and not more than 65 mol %.

Claims

1. A porous layer, comprising:

a polyvinylidene fluoride-based resin,

wherein, assuming that a sum of individual amounts of crystal form α and

crystal form β

contained in the polyvinylidene fluoride-based resin is 100 mol %, the amount of crystal form α

contained in the polyvinylidene fluoride-based resin is not less than 10 mol % and not more than 65 mol %, wherein the amount of crystal form α

is calculated from an absorption intensity at around 765 cm<sup>−

1</sup> in an IR spectrum of the porous layer, while the amount of 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 porous layer according to claim 1, wherein the polyvinylidene fluoride-based resin is (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 porous layer according to claim 1, wherein the polyvinylidene fluoride-based resin has a weight-average molecular weight of not less than 300,000 and not more than 3,000,000.

4. The porous lawyer according to claim 1, further comprising:

a filler which accounts for not less than 1% by mass and not more than 30% by mass of a sum of individual amounts of the polyvinylidene fluoride-based, resin and the filler.

5. The porous layer according to claim 4, wherein the filler has a volume average particle size of not less than 0.01 μ

m and not more than 10 μ

m.

6. A laminated body, comprising:

a porous base material containing a polyolefin-based resin as a main component; and

a porous layer according to claim 1, the porous layer being laminated on at least one surface of the porous base material.

7. A separator for a nonaqueous electrolyte secondary battery, comprising:

a porous base material containing a polyolefin-based resin as a main component; and

a porous layer according to claim 1, the porous layer being laminated on at least one surface of the porous base material.

8. A member for a nonaqueous electrolyte secondary battery,

the member comprising in sequence:

a cathode;

a porous layer according to claim 1; and

an anode.

9. A nonaqueous electrolyte secondary battery comprising:

a porous layer according to claim 1.