LAMINATED BODY, SEPARATOR, AND NONAQUEOUS SECONDARY BATTERY

• US 20170033347A1
• Filed: 10/13/2016
• Published: 02/02/2017
• 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 9,711,775 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 laminated body of the present invention 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, the laminated body satisfying 0≦(A)−(B)≦20 mN/m, where (A) represents the critical surface tension over the outermost surface of the porous layer, and (B) represents the critical surface tension that, in a case where the porous layer has been peeled from the laminated body at an interface with the porous film, the porous film has on the side of the interface.

Claims

1-29. -29. (canceled)

30. A laminated body, comprising:

a porous film containing a polyolefin as a main component; and

a porous layer laminated on at least one surface of the porous film, the porous layer containing a resin,

the resin being a polyvinylidene fluoride-hexafluoropropylene copolymer,

the porous film having a thickness within a range of not less than 4 μ

m and not more than 17 μ

m,

the porous film having a weight per unit area within a range of not less than 5 g/m² and not more than 12 g/m²,

the porous layer having a weight per unit area within a range of not less than 0.1 g/m² and not more than 5 g/m²,

the laminated body satisfying Formula (1) below,

0 mN/m≦

(A)−

(B)≦

20 mN/m 

 

(1),

where

(A) represents a critical surface tension over an outermost surface of the porous layer, and

(B) represents a critical surface tension that, in a case where the porous layer has been peeled from the laminated body at an interface with the porous film, the porous film has on a side of the interface,

the laminated body satisfying Formula (2) below,

(C)/(D)≦

0.13 

 

(2),

where

(C) represents an average pore diameter of the porous film, and

(D) represents a porosity of the porous film,

the average pore diameter (C) having a value in μ

m indicative of a mean value of respective sizes of pores in the porous film,

the porosity (D) having a value indicative of a volume proportion of void in the actual porous film with reference to a volume of the porous film assumed to have no void.

31. A separator for a nonaqueous electrolyte secondary battery,

the separator comprising

a laminated body according to claim 30.

32. A nonaqueous electrolyte secondary battery, comprising

a separator according to claim 31.