LAMINATED BODY, SEPARATOR, AND NON-AQUEOUS SECONDARY BATTERY

• US 20170170443A1
• Filed: 07/27/2015
• Published: 06/15/2017
• Est. Priority Date: 08/29/2014
• Status: Active Grant

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: MURAKAMI, Chikara, OGATA, Toshihiko, ARISE, Ichiro, KURAKANE, Kosuke, YOSHIMARU, Chikae
• Granted Patent: US 9,865,857 B2
• Time in Patent Office: Days
• CPC Class Codes: H01M 10/052 Li-accumulators
• 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 10/0568 characterised by the solutes
• CPC Class Codes: H01M 10/0569 characterised by the solvents
• 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 2004/027 Negative electrodes
• CPC Class Codes: H01M 2004/028 Positive electrodes
• CPC Class Codes: H01M 2200/10 Temperature sensitive devices
• CPC Class Codes: H01M 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 2300/004 Three solvents
• CPC Class Codes: H01M 4/0404 by coating on electrode collectors
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/133 Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/1391 of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/1393 of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/505 of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: H01M 4/623 fluorinated polymers
• CPC Class Codes: H01M 4/661 : Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: H01M 50/417 : Polyolefins
• CPC Class Codes: H01M 50/426 : Fluorocarbon polymers
• CPC Class Codes: H01M 50/44 : Fibrous material
• CPC Class Codes: H01M 50/449 : having a layered structure
• CPC Class Codes: H01M 50/491 : Porosity
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02P 70/50 : Manufacturing or production processes characterised by the final manufactured product

Abstract

A first laminated body includes: a porous film containing a polyolefin as a main component; and a porous layer on at least one surface of the porous film, the porous layer containing a resin. A second laminated body includes: a porous film containing a polyolefin as a main component; and a porous layer containing a resin. The laminated body is usable as a secondary battery separator having a higher dielectric strength. A third laminated body is provided in which occurrence of a curl is prevented. A nonaqueous secondary battery separator is provided disposed between a cathode and an anode, the separator including: a porous base material containing a polyolefin as a main component; and a porous layer on at least one surface of the porous base material, the porous layer containing a polyvinylidene fluoride-based resin.

Claims

1-12. -12. (canceled)

13. A laminated body, comprising:

a stack of (i) a first porous layer containing a polyolefin-based resin and (ii) a second porous layer,

a difference being 1000 ppm or less between (A) a water content rate of the laminated body in an atmosphere having a dew point of 20°

C. and (B) a water content rate of the laminated body in an atmosphere having a dew point of −

30°

C.,

a difference between (C) a water content of the first porous layer and (D) a water content of the second porous layer both in an atmosphere having a dew point of 20°

C. is 10 mg/m² or less,

respective openings of pores each having an area of 0.5 μ

m² or more occupying 30% or less of a surface of the second porous layer.

15. The laminated body according to claim 13,

wherein

the respective openings occupy 5% or less of the surface of the second porous layer.

16. The laminated body according to claim 13,

wherein

the second porous layer either (i) has a structure in which skeletons each having a diameter of 1 μ

m or less are connected to each other to form a three-dimensional network or (ii) contains a fine resin particle.

17. The laminated body according to claim 13,

wherein

the second porous layer contains a polyvinylidene fluoride-based resin.

18. The laminated body according to claim 16,

wherein

the fine resin particle is of a resin having a structure unit derived from α

-olefin having 2 to 4 carbon atoms.

19. The laminated body according to claim 13,

wherein

the difference is 100 ppm or more between the water content rate (A) and the water content rate (B).

20. The laminated body according to claim 13,

wherein

the difference between the water content (C) and the water content (D) is 1 mg/m² or more.

21. A separator, comprising

a laminated body according to claim 13.

22. A nonaqueous secondary battery, comprising

a separator according to claim 21.

14. (canceled)

23-29. -29. (canceled)